Journal articles on the topic 'Lipid'
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1
Schilke, Robert Michael, Cassidy M. R. Blackburn, Shashanka Rao, David M. Krzywanski, and Matthew D. Woolard. "Macrophage-associated lipin-1 regulates lipid catabolism to promote effective efferocytosis." Journal of Immunology 204, no. 1_Supplement (May 1, 2020): 69.22. http://dx.doi.org/10.4049/jimmunol.204.supp.69.22.
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Abstract Failure to resolve inflammation leads to numerous chronic diseases. Disease resolution requires the effective removal of dead cells by macrophage-mediated efferocytosis. Excess lipid accumulation within macrophages can lead to dysfunction that promotes disease pathogenesis. Efferocytosis results in a significant accumulation of lipid inside the macrophage, yet macrophage continue to function. This suggest that during efferocytosis, macrophages have pathways to ameliorate the high lipid load. We have identified that lipin-1, a regulator of lipid metabolism, is critical to proper macrophage responses during efferocytosis. Lipin-1 is a phosphatidic acid phosphatase that also functions as a transcriptional coregulator. We used mice that lack either lipin-1 enzymatic activity or both functions in myeloid cells to define how lipin-1 regulates excess lipids during efferocytosis. We have demonstrated that mice lacking myeloid-associated lipin-1 have diminished apoptotic cell (AC) clearance in a zymozan model of efferocytosis. Clearance of lipids during efferocytosis is accomplished through beta-oxidation. Bone marrow derived macrophages lacking lipin-1 have reduced oxidative respiration in response to both AC and purified palmitate (lipid), indicating defective lipid catabolism. These data suggest that lipin-1 regulates mitochondrial lipid catabolism to reduce lipid burden during efferocytosis. These studies highlight regulation of lipid metabolic pathways in macrophages during efferocytosis that allow them to handle excess lipid burden and promote disease resolution.
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Hallett, Nanette. "Lipids and Lipid Disorders." Dimensions of Critical Care Nursing 10, no. 6 (November 1991): 345. http://dx.doi.org/10.1097/00003465-199111000-00011.
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RAJ, BRITO. "Investigating the influence of lipids on Nano-structured lipid carrier formulation." Journal of Medical pharmaceutical and allied sciences 12, no. 6 (December 26, 2023): 6147–54. http://dx.doi.org/10.55522/jmpas.v12i6.5220.
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The study aimed to evaluate the effect of different lipids on the properties of nanostructured lipid carrier (NLC) formulations. The particle size, zeta potential, polydispersity index, entrapment efficiency, and drug release at 24 hours were analyzed for formulations containing various lipid matrices. Among the formulations tested, N3 (Compritol 888 ATO and Softigen) exhibited the most favourable characteristics, including the smallest particle size, highest entrapment efficiency, sustained drug release, and good stability, as indicated by a high zeta potential. Other lipids, such as Witepsol H 32 and Beeswax, also showed desirable properties. The formulations containing Dynasan 114 and Acconon-C-44 EP/NF resulted in larger particle sizes, lower entrapment efficiencies, and slower drug release. Cholesterol exhibited distinct properties, with a lower zeta potential and moderate drug release. The findings highlight the importance of lipid selection in determining the performance and functionality of NLC formulations. Compritol 888 ATO and Softigen were identified as suitable lipids for further optimization of NLC formulations. These lipids contribute to the formation of stable and uniform NLC particles, which are desirable for efficient drug delivery systems. The study provides valuable insights for formulating NLCs with optimized characteristics, facilitating the development of effective drug delivery systems. Future research can focus on optimizing other factors to enhance the performance and therapeutic effectiveness of NLC formulations.
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Lee, Anthony G. "Lipid–protein interactions." Biochemical Society Transactions 39, no. 3 (May 20, 2011): 761–66. http://dx.doi.org/10.1042/bst0390761.
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Intrinsic membrane proteins are solvated by a shell of lipid molecules interacting with the membrane-penetrating surface of the protein; these lipid molecules are referred to as annular lipids. Lipid molecules are also found bound between transmembrane α-helices; these are referred to as non-annular lipids. Annular lipid binding constants depend on fatty acyl chain length, but the dependence is less than expected from models based on distortion of the lipid bilayer alone. This suggests that hydrophobic matching between a membrane protein and the surrounding lipid bilayer involves some distortion of the transmembrane α-helical bundle found in most membrane proteins, explaining the importance of bilayer thickness for membrane protein function. Annular lipid binding constants also depend on the structure of the polar headgroup region of the lipid, and hotspots for binding anionic lipids have been detected on some membrane proteins; binding of anionic lipid molecules to these hotspots can be functionally important. Binding of anionic lipids to non-annular sites on membrane proteins such as the potassium channel KcsA can also be important for function. It is argued that the packing preferences of the membrane-spanning α-helices in a membrane protein result in a structure that matches nicely with that of the surrounding lipid bilayer, so that lipid and protein can meet without either having to change very much.
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Kirby, Mike. "Lipids and lipid‐modifying therapy." Trends in Urology & Men's Health 12, no. 3 (May 2021): 23–28. http://dx.doi.org/10.1002/tre.803.
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ISHIMOTO, Kenji. "Lipin 1 in Lipid Metabolism." YAKUGAKU ZASSHI 131, no. 8 (August 1, 2011): 1189–94. http://dx.doi.org/10.1248/yakushi.131.1189.
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Tamura, Yasushi, Shin Kawano, and Toshiya Endo. "Lipid homeostasis in mitochondria." Biological Chemistry 401, no. 6-7 (May 26, 2020): 821–33. http://dx.doi.org/10.1515/hsz-2020-0121.
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AbstractMitochondria are surrounded by the two membranes, the outer and inner membranes, whose lipid compositions are optimized for proper functions and structural organizations of mitochondria. Although a part of mitochondrial lipids including their characteristic lipids, phosphatidylethanolamine and cardiolipin, are synthesized within mitochondria, their precursor lipids and other lipids are transported from other organelles, mainly the ER. Mitochondrially synthesized lipids are re-distributed within mitochondria and to other organelles, as well. Recent studies pointed to the important roles of inter-organelle contact sites in lipid trafficking between different organelle membranes. Identification of Ups/PRELI proteins as lipid transfer proteins shuttling between the mitochondrial outer and inner membranes established a part of the molecular and structural basis of the still elusive intra-mitochondrial lipid trafficking.
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Clark, Robert B., Jorge L. Cervantes, Mark W. Maciejewski, Vahid Farrokhi, Reza Nemati, Xudong Yao, Emily Anstadt, et al. "Serine Lipids of Porphyromonas gingivalis Are Human and Mouse Toll-Like Receptor 2 Ligands." Infection and Immunity 81, no. 9 (July 8, 2013): 3479–89. http://dx.doi.org/10.1128/iai.00803-13.
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ABSTRACTThe total cellular lipids ofPorphyromas gingivalis, a known periodontal pathogen, were previously shown to promote dendritic cell activation and inhibition of osteoblasts through engagement of Toll-like receptor 2 (TLR2). The purpose of the present investigation was to fractionate all lipids ofP. gingivalisand define which lipid classes account for the TLR2 engagement, based on bothin vitrohuman cell assays andin vivostudies in mice. Specific serine-containing lipids ofP. gingivalis, called lipid 654 and lipid 430, were identified in specific high-performance liquid chromatography fractions as the TLR2-activating lipids. The structures of these lipids were defined using tandem mass spectrometry and nuclear magnetic resonance methods.In vitro, both lipid 654 and lipid 430 activated TLR2-expressing HEK cells, and this activation was inhibited by anti-TLR2 antibody. In contrast, TLR4-expressing HEK cells failed to be activated by either lipid 654 or lipid 430. Wild-type (WT) or TLR2-deficient (TLR2−/−) mice were injected with either lipid 654 or lipid 430, and the effects on serum levels of the chemokine CCL2 were measured 4 h later. Administration of either lipid 654 or lipid 430 to WT mice resulted in a significant increase in serum CCL2 levels; in contrast, the administration of lipid 654 or lipid 430 to TLR2−/−mice resulted in no increase in serum CCL2. These results thus identify a new class of TLR2 ligands that are produced byP. gingivalisthat likely play a significant role in mediating inflammatory responses both at periodontal sites and, potentially, in other tissues where these lipids might accumulate.
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Kobayashi, Toshihide, Feng Gu, and Jean Gruenberg. "Lipids, lipid domains and lipid–protein interactions in endocytic membrane traffic." Seminars in Cell & Developmental Biology 9, no. 5 (October 1998): 517–26. http://dx.doi.org/10.1006/scdb.1998.0257.
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Gretskaya, Nataliya, Mikhail Akimov, Dmitry Andreev, Anton Zalygin, Ekaterina Belitskaya, Galina Zinchenko, Elena Fomina-Ageeva, Ilya Mikhalyov, Elena Vodovozova, and Vladimir Bezuglov. "Multicomponent Lipid Nanoparticles for RNA Transfection." Pharmaceutics 15, no. 4 (April 20, 2023): 1289. http://dx.doi.org/10.3390/pharmaceutics15041289.
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Despite the wide variety of available cationic lipid platforms for the delivery of nucleic acids into cells, the optimization of their composition has not lost its relevance. The purpose of this work was to develop multi-component cationic lipid nanoparticles (LNPs) with or without a hydrophobic core from natural lipids in order to evaluate the efficiency of LNPs with the widely used cationic lipoid DOTAP (1,2-dioleoyloxy-3-[trimethylammonium]-propane) and the previously unstudied oleoylcholine (Ol-Ch), as well as the ability of LNPs containing GM3 gangliosides to transfect cells with mRNA and siRNA. LNPs containing cationic lipids, phospholipids and cholesterol, and surfactants were prepared according to a three-stage procedure. The average size of the resulting LNPs was 176 nm (PDI 0.18). LNPs with DOTAP mesylate were more effective than those with Ol-Ch. Core LNPs demonstrated low transfection activity compared with bilayer LNPs. The type of phospholipid in LNPs was significant for the transfection of MDA-MB-231 and SW 620 cancer cells but not HEK 293T cells. LNPs with GM3 gangliosides were the most efficient for the delivery of mRNA to MDA-MB-231 cells and siRNA to SW620 cells. Thus, we developed a new lipid platform for the efficient delivery of RNA of various sizes to mammalian cells.
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Kamisaka, Y., and N. Noda. "Intracellular transport of phosphatidic acid and phosphatidylcholine into lipid bodies: use of fluorescent lipids to study lipid-body formation in an oleaginous fungus." Biochemical Society Transactions 28, no. 6 (December 1, 2000): 723–25. http://dx.doi.org/10.1042/bst0280723.
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Fluorescent phosphatidic acid and phosphatidylcholine were used to characterize lipid-transport pathways into lipid bodies in an oleaginous fungus, Mortierella ramanniana var. angulispora. Several characteristics of the lipid transport such as temperature dependence and ATP dependence were evaluated. The transport depicted by these fluorescent lipids was consistent with metabolism of radiolabelled lipids, indicating that fluorescent lipids are useful to study lipid-body formation in this fungus. The results dissect lipid transport of phosphatidic acid and phosphatidylcholine into lipid bodies and reveal regulatory steps for lipidbody formation in this fungus.
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Nakmode, Deepa, Valamla Bhavana, Pradip Thakor, Jitender Madan, Pankaj Kumar Singh, Shashi Bala Singh, Jessica M. Rosenholm, Kuldeep K. Bansal, and Neelesh Kumar Mehra. "Fundamental Aspects of Lipid-Based Excipients in Lipid-Based Product Development." Pharmaceutics 14, no. 4 (April 11, 2022): 831. http://dx.doi.org/10.3390/pharmaceutics14040831.
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Poor aqueous solubility of drugs is still a foremost challenge in pharmaceutical product development. The use of lipids in designing formulations provides an opportunity to enhance the aqueous solubility and consequently bioavailability of drugs. Pre-dissolution of drugs in lipids, surfactants, or mixtures of lipid excipients and surfactants eliminate the dissolution/dissolving step, which is likely to be the rate-limiting factor for oral absorption of poorly water-soluble drugs. In this review, we exhaustively summarize the lipids excipients in relation to their classification, absorption mechanisms, and lipid-based product development. Methodologies utilized for the preparation of solid and semi-solid lipid formulations, applications, phase behaviour, and regulatory perspective of lipid excipients are discussed.
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Dowds, C. Marie, Sabin-Christin Kornell, Richard S. Blumberg, and Sebastian Zeissig. "Lipid antigens in immunity." Biological Chemistry 395, no. 1 (January 1, 2014): 61–81. http://dx.doi.org/10.1515/hsz-2013-0220.
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Abstract Lipids are not only a central part of human metabolism but also play diverse and critical roles in the immune system. As such, they can act as ligands of lipid-activated nuclear receptors, control inflammatory signaling through bioactive lipids such as prostaglandins, leukotrienes, lipoxins, resolvins, and protectins, and modulate immunity as intracellular phospholipid- or sphingolipid-derived signaling mediators. In addition, lipids can serve as antigens and regulate immunity through the activation of lipid-reactive T cells, which is the topic of this review. We will provide an overview of the mechanisms of lipid antigen presentation, the biology of lipid-reactive T cells, and their contribution to immunity.
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Maxwell, Robert J. "Determination of Total Lipid and Lipid Subclasses in Meat and Meat Products." Journal of AOAC INTERNATIONAL 70, no. 1 (January 1, 1987): 74–77. http://dx.doi.org/10.1093/jaoac/70.1.74.
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Abstract Current interest in physiological and nutritional activities of the sterol, polyunsaturated fatty acid, and polar lipid fractions of meats and other foods indicates that analytical methods for lipids should be evaluated on their ability to recover and quantitate these classes. Current methods of lipid isolation furnish an extract that is dependent on the solvent(s) used, the type of food material, the temperature of extraction, and the relative proportions of the lipid classes present. Extraction with ethers or other relatively nonpolar solvents removes principally the neutral fats and nonpolar lipids. For an approximation of the crude fat content, such extraction is often sufficient, because the nonpolar fraction generally constitutes over 90% of the total lipids present. The polar lipids include the biochemically important (ω-3) and (ω-6) polyunsaturated fatty acid classes; thus, the method of lipid extraction of food products becomes relevant for a more complete and valuable characterization of their nutritional value. The various methods of lipid determination for meat products are examined for their total recovery of these important lipid groups. A sequential extraction in conjunction with subsequent analytical methods is recommended.
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Wang, Zhen, and Christoph Benning. "Chloroplast lipid synthesis and lipid trafficking through ER–plastid membrane contact sites." Biochemical Society Transactions 40, no. 2 (March 21, 2012): 457–63. http://dx.doi.org/10.1042/bst20110752.
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Plant chloroplasts contain an intricate photosynthetic membrane system, the thylakoids, and are surrounded by two envelope membranes at which thylakoid lipids are assembled. The glycoglycerolipids mono- and digalactosyldiacylglycerol, and sulfoquinovosyldiacylglycerol as well as phosphatidylglycerol, are present in thylakoid membranes, giving them a unique composition. Fatty acids are synthesized in the chloroplast and are either directly assembled into thylakoid lipids at the envelope membranes or exported to the ER (endoplasmic reticulum) for extraplastidic lipid assembly. A fraction of lipid precursors is reimported into the chloroplast for the synthesis of thylakoid lipids. Thus polar lipid assembly in plants requires tight co-ordination between the chloroplast and the ER and necessitates inter-organelle lipid trafficking. In the present paper, we discuss the current knowledge of the export of fatty acids from the chloroplast and the import of chloroplast lipid precursors assembled at the ER. Direct membrane contact sites between the ER and the chloroplast outer envelopes are discussed as possible conduits for lipid transfer.
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Bamgbose, Temitayo Taiwo, Robert M. Schilke, Cassidy M. R. Blackburn, and Matthew D. Woolard. "Lipin-1 restrains lipid synthesis to promote proresolving macrophage function and disease resolution." Journal of Immunology 208, no. 1_Supplement (May 1, 2022): 54.23. http://dx.doi.org/10.4049/jimmunol.208.supp.54.23.
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Abstract Macrophages are critical to maintaining and restoring tissue homeostasis during inflammation. Unresolved inflammation contributes to the pathophysiology of cardiometabolic diseases. The lipid metabolic state of macrophages influences their function. Lipid synthesis contributes to proinflammatory responses, while beta-oxidation is required for pro-resolving macrophage function. However, how lipid metabolism is regulated during macrophage activation is not well understood. Lipin-1 is a phosphatidic acid phosphatase with a transcriptional coregulatory activity that is proposed to act as a regulator of lipid metabolism. We have previously demonstrated that lipin-1 is atheroprotective and promotes wound healing. Within macrophages, lipin-1 is required for beta-oxidation and apoptotic cell engulfment, both key activities of pro-resolving macrophages. We investigated the contribution of lipin-1 in regulating lipid metabolism during pro-resolving macrophage responses using metabolomics, lipidomics, and Western blot analysis. IL-4 stimulation of macrophage promotes lipid catabolism; however, in lipin-1 KO bone marrow-derived macrophages, we observed the production of metabolites that contribute to lipid synthesis, decrease phosphorylation of ACC (a marker of lipid synthesis) and a build-up of free fatty acids. We also observed increased ceramides in lipin-1 KO macrophages and a decrease in pras40 phosphorylation, which is consistent with increased ceramide synthesis. These results suggest that lipin-1 restrains de novo lipid synthesis and ceramide production to promote beta-oxidation for optimal pro-resolving macrophage function. Supported by1-R01HL131844-04 grant from NHLBI/NIH
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Abdullah Q. Khudhur, Nidhal K. Maraie, and Ayad M.R. Raauf. "Highlight on lipids and its use for covalent and non-covalent conjugations." Al Mustansiriyah Journal of Pharmaceutical Sciences 20, no. 3 (September 1, 2020): 1–13. http://dx.doi.org/10.32947/ajps.v20i3.754.
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Lipids are organic fatty or waxy compounds which are used to make nanocarriers that are promising for drug delivery. When lipids associated covalently (lipid-drug conjugate LDC) or non- covalently (drug-lipid complex) to drugs to form Lipid Drug Conjugates (LDC). Most common types of lipids
used for drug conjugation are fatty acids, glycerides, steroids, and phospholipids. Conjugation with lipids may change the properties of the drug and significantly increase the drug lipophilicity. Lipid-drug conjugation could improve the delivery of drugs by the lymphatic system, enhance bioavailability of oral administered drugs, improve drug targeting in tumor diseases, enhance the loading of drugs into some delivery carriers, increase drug stability, and many others. Lipid-drug conjugates can be prepared through different strategies for conjugation and by chemical linkers depending on the chemical structure of both drugs and lipids, careful selection of lipids and drug are necessary in designing the lipid-drug conjugate to achieve maximum benefits.
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Florance, Ida, and Seenivasan Ramasubbu. "Current Understanding on the Role of Lipids in Macrophages and Associated Diseases." International Journal of Molecular Sciences 24, no. 1 (December 29, 2022): 589. http://dx.doi.org/10.3390/ijms24010589.
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Lipid metabolism is the major intracellular mechanism driving a variety of cellular functions such as energy storage, hormone regulation and cell division. Lipids, being a primary component of the cell membrane, play a pivotal role in the survival of macrophages. Lipids are crucial for a variety of macrophage functions including phagocytosis, energy balance and ageing. However, functions of lipids in macrophages vary based on the site the macrophages are residing at. Lipid-loaded macrophages have recently been emerging as a hallmark for several diseases. This review discusses the significance of lipids in adipose tissue macrophages, tumor-associated macrophages, microglia and peritoneal macrophages. Accumulation of macrophages with impaired lipid metabolism is often characteristically observed in several metabolic disorders. Stress signals differentially regulate lipid metabolism. While conditions such as hypoxia result in accumulation of lipids in macrophages, stress signals such as nutrient deprivation initiate lipolysis and clearance of lipids. Understanding the biology of lipid accumulation in macrophages requires the development of potentially active modulators of lipid metabolism.
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Ahire, Sandip Barku, and Ravindra Keshavrao Kamble. "A Concise review on application of solid lipids and various techniques in the formulation development." Journal of Drug Delivery and Therapeutics 13, no. 5 (May 15, 2023): 87–97. http://dx.doi.org/10.22270/jddt.v13i5.5817.
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Lipids have wide range of applications in food and pharmaceuticals. The pharmaceuticals application of lipid is to improve solubility of drug also helps to improve the bioavailability. The dissolution/dissolving phase, which is probably the rate-limiting component for oral absorption of poorly water-soluble drugs, is eliminated by pre-dissolving pharmaceuticals in lipids, surfactants, or combinations of lipid excipients and surfactants. The most widely used co-solvents, together with lipid excipients, are propylene glycol, glycerol, and polyethylene glycols-400, poloxamer etc. various technologies are used such as melt extrusion, melt granulation for preparation of lipid based oral modified released dosage forms. This review summaries the overview of the lipid excipients in terms of their classification, methods of absorption, and lipid-based product development. The manufacture of solid and semi-solid lipid formulations using various methodologies, applications, phase behaviour, and the regulatory outlook of lipid excipients are covered.
Keywords: Solid lipids, lipid classification, solidification techniques, modified released.
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Eyster, Kathleen M. "The membrane and lipids as integral participants in signal transduction: lipid signal transduction for the non-lipid biochemist." Advances in Physiology Education 31, no. 1 (January 2007): 5–16. http://dx.doi.org/10.1152/advan.00088.2006.
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Reviews of signal transduction have often focused on the cascades of protein kinases and protein phosphatases and their cytoplasmic substrates that become activated in response to extracellular signals. Lipids, lipid kinases, and lipid phosphatases have not received the same amount of attention as proteins in studies of signal transduction. However, lipids serve a variety of roles in signal transduction. They act as ligands that activate signal transduction pathways as well as mediators of signaling pathways, and lipids are the substrates of lipid kinases and lipid phosphatases. Cell membranes are the source of the lipids involved in signal transduction, but membranes also constitute lipid barriers that must be traversed by signal transduction pathways. The purpose of this review is to explore the magnitude and diversity of the roles of the cell membrane and lipids in signal transduction and to highlight the interrelatedness of families of lipid mediators in signal transduction.
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Evans, Thomas M., and Shale Beharie. "Are lipids always depleted? Comparison of hydrogen, carbon, and nitrogen isotopic values in the muscle and lipid of larval lampreys." PLOS ONE 19, no. 1 (January 11, 2024): e0286535. http://dx.doi.org/10.1371/journal.pone.0286535.
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Stable isotope ratios in organisms can be used to estimate dietary source contributions, but lipids must first be accounted for to interpret values meaningfully. Lipids are depleted in heavy isotopes because during lipid synthesis light isotopes of carbon (12C) and hydrogen (1H) are preferentially incorporated. Prior work in larval lampreys has noted unusual lipid effects, which suggest lipids are enriched in the heavy isotope of carbon (13C), but still depleted in the heavy isotope of hydrogen (deuterium; 2H); nitrogen, a relatively rare element in lipids, has not been identified as being as sensitive to lipid content. Our objective was to determine if stable isotope ratios of hydrogen, carbon, and nitrogen behaved as expected in larval lampreys, or if their lipids presented different isotopic behavior. The δ2H, δ13C, and δ15N were measured from the muscle of four lamprey species before and after lipid extraction. In addition, muscle of least brook lamprey (Lampetra aepyptera) was collected every three months for a year from two streams in Maryland. Isotopic ratios were measured in bulk and lipid-extracted muscles, as well as in extracted lipids. The difference between muscle samples before and after lipid extraction (Δδ2H, Δδ13C, Δδ15N) was positively related to lipid proxy (%H or C:N ratio) and were fit best by linear models for Δδ2H and Δδ15N, and by a non-linear model for Δδ13C. The difference between lipid-extracted muscle and lipid δ13C (ΔMLδ13C) was negative and varied between months (ANOVA, F3,53 = 5.05, p < 0.005). Our work suggests that while lipids are often depleted in 13C, this is not a universal rule; however, the depletion of 2H in lipid synthesis appears broadly true.
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Rochman, M. Fatchur, Aditya Darmawan, and Pramudya Wardhana. "Nanostructured Lipid Carriers System Solid Lipid Poloxamer and Stearic Acid with Liquid Lipid Soybean Oil." Jurnal Ilmiah Medicamento 8, no. 1 (March 29, 2022): 1–7. http://dx.doi.org/10.36733/medicamento.v8i1.3161.
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Nanostructured Lipid Carriers (NLC) are lipid-based carrier system that use a matrix combination in the form of solid and liquid which are stabilized with the addition of surfactant. This NLC was developed to facilitate the dispersion of hydrophobic bioactive compound in a hydrophilic system. This research aims to get the right formulation and can develop stable characterization, using solid lipids Poloxamer and Stearic Acid with liquid lipids Soybeans Oil using surfactant Tween 80 and co-surfactant Propyleneglycol.. The to make the formulation of NLC with a ratio of poloxamer and stearic acid as solid lipid: soybeans oil asliquid lipid is 3:3, 4:2, 5:1 ,surfactant tween 80 and co surfactant propyleneglycol. Test the NLC characterization including PH value, viscosity, particle size, and polydispersity index. Data analysis used to evaluate the characteristics of the obtained NLC using descriptive. The result of the research showed that NLC had good characteistics at a solid lipid poloxamer and stearic acid with Soybean oil liquid lipid ,pH in the range 4-6; good viscosity; good particles have a range of 1000nm; and polydispersity index which shows the results of monodispersion. Nanostructured Llipid Carriers with solid lipid poloxamer and stearic acid and liquid lipid soybean oil obtained good characteristics.
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Kloska, Anna, Magdalena Węsierska, Marcelina Malinowska, Magdalena Gabig-Cimińska, and Joanna Jakóbkiewicz-Banecka. "Lipophagy and Lipolysis Status in Lipid Storage and Lipid Metabolism Diseases." International Journal of Molecular Sciences 21, no. 17 (August 25, 2020): 6113. http://dx.doi.org/10.3390/ijms21176113.
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This review discusses how lipophagy and cytosolic lipolysis degrade cellular lipids, as well as how these pathway ys communicate, how they affect lipid metabolism and energy homeostasis in cells and how their dysfunction affects the pathogenesis of lipid storage and lipid metabolism diseases. Answers to these questions will likely uncover novel strategies for the treatment of aforementioned human diseases, but, above all, will avoid destructive effects of high concentrations of lipids—referred to as lipotoxicity—resulting in cellular dysfunction and cell death.
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Passos Gibson, Victor, Martin Fauquignon, Emmanuel Ibarboure, Jeanne Leblond Chain, and Jean-François Le Meins. "Switchable Lipid Provides pH-Sensitive Properties to Lipid and Hybrid Polymer/Lipid Membranes." Polymers 12, no. 3 (March 11, 2020): 637. http://dx.doi.org/10.3390/polym12030637.
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Blending amphiphilic copolymers and lipids constitutes a novel approach to combine the advantages of polymersomes and liposomes into a new single hybrid membrane. Efforts have been made to design stimuli-responsive vesicles, in which the membrane’s dynamic is modulated by specific triggers. In this investigation, we proposed the design of pH-responsive hybrid vesicles formulated with poly(dimethylsiloxane)-block-poly(ethylene oxide) backbone (PDMS36-b-PEO23) and cationic switchable lipid (CSL). The latter undergoes a pH-triggered conformational change and induces membrane destabilization. Using confocal imaging and DLS measurements, we interrogated the structural changes in CSL-doped lipid and hybrid polymer/lipid unilamellar vesicles at the micro- and nanometric scale, respectively. Both switchable giant unilamellar lipid vesicles (GUV) and hybrid polymer/lipid unilamellar vesicles (GHUV) presented dynamic morphological changes, including protrusions and fission upon acidification. At the submicron scale, scattered intensity decreased for both switchable large unilamellar vesicles (LUV) and hybrid vesicles (LHUV) under acidic pH. Finally, monitoring the fluorescence leakage of encapsulated calcein, we attested that CSL increased the permeability of GUV and GHUV in a pH-specific fashion. Altogether, these results show that switchable lipids provide a pH-sensitive behavior to hybrid polymer/lipid vesicles that could be exploited for the triggered release of drugs, cell biomimicry studies, or as bioinspired micro/nanoreactors.
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Kao, Yu-Chia, Pei-Chuan Ho, Yuan-Kun Tu, I.-Ming Jou, and Kuen-Jer Tsai. "Lipids and Alzheimer’s Disease." International Journal of Molecular Sciences 21, no. 4 (February 22, 2020): 1505. http://dx.doi.org/10.3390/ijms21041505.
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Lipids, as the basic component of cell membranes, play an important role in human health as well as brain function. The brain is highly enriched in lipids, and disruption of lipid homeostasis is related to neurologic disorders as well as neurodegenerative diseases such as Alzheimer’s disease (AD). Aging is associated with changes in lipid composition. Alterations of fatty acids at the level of lipid rafts and cerebral lipid peroxidation were found in the early stage of AD. Genetic and environmental factors such as apolipoprotein and lipid transporter carrying status and dietary lipid content are associated with AD. Insight into the connection between lipids and AD is crucial to unraveling the metabolic aspects of this puzzling disease. Recent advances in lipid analytical methodology have led us to gain an in-depth understanding on lipids. As a result, lipidomics have becoming a hot topic of investigation in AD, in order to find biomarkers for disease prediction, diagnosis, and prevention, with the ultimate goal of discovering novel therapeutics.
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Kamiya, Koki, Chika Arisaka, and Masato Suzuki. "Investigation of Fusion between Nanosized Lipid Vesicles and a Lipid Monolayer Toward Formation of Giant Lipid Vesicles with Various Kinds of Biomolecules." Micromachines 12, no. 2 (January 26, 2021): 133. http://dx.doi.org/10.3390/mi12020133.
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We determined the properties of fusion between large unilamellar vesicles (LUVs) and the lipid monolayer by measuring the fluorescence intensity of rhodamine-conjugated phospholipids in cell-sized lipid vesicles. The charge of LUVs (containing cationic lipids) and lipid droplets (containing anionic lipids) promoted lipid membrane fusion. We also investigated the formation of cell-sized lipid vesicles with asymmetric lipid distribution using this fusion method. Moreover, cell-sized asymmetric ganglioside vesicles can be generated from the planar lipid bilayer formed at the interface between the lipid droplets with/without LUVs containing ganglioside. The flip-flop dynamics of ganglioside were observed on the asymmetric ganglioside vesicles. This fusion method can be used to form asymmetric lipid vesicles with poor solubility in n-decane or lipid vesicles containing various types of membrane proteins for the development of complex artificial cell models.
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Zhang, Yongli, Jinghua Ge, Xin Bian, and Avinash Kumar. "Quantitative Models of Lipid Transfer and Membrane Contact Formation." Contact 5 (January 2022): 251525642210960. http://dx.doi.org/10.1177/25152564221096024.
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Lipid transfer proteins (LTPs) transfer lipids between different organelles, and thus play key roles in lipid homeostasis and organelle dynamics. The lipid transfer often occurs at the membrane contact sites (MCS) where two membranes are held within 10–30 nm. While most LTPs act as a shuttle to transfer lipids, recent experiments reveal a new category of eukaryotic LTPs that may serve as a bridge to transport lipids in bulk at MCSs. However, the molecular mechanisms underlying lipid transfer and MCS formation are not well understood. Here, we first review two recent studies of extended synaptotagmin (E-Syt)-mediated membrane binding and lipid transfer using novel approaches. Then we describe mathematical models to quantify the kinetics of lipid transfer by shuttle LTPs based on a lipid exchange mechanism. We find that simple lipid mixing among membranes of similar composition and/or lipid partitioning among membranes of distinct composition can explain lipid transfer against a concentration gradient widely observed for LTPs. We predict that selective transport of lipids, but not membrane proteins, by bridge LTPs leads to osmotic membrane tension by analogy to the osmotic pressure across a semipermeable membrane. A gradient of such tension and the conventional membrane tension may drive bulk lipid flow through bridge LTPs at a speed consistent with the fast membrane expansion observed in vivo. Finally, we discuss the implications of membrane tension and lipid transfer in organelle biogenesis. Overall, the quantitative models may help clarify the mechanisms of LTP-mediated MCS formation and lipid transfer.
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Woolard, Matthew D., Cassidy Blackburn, Robert Schilke, and Temitayo Bamgbose. "Lipin-1 integrates lipid metabolism with macrophage function to promote inflammation resolution." Journal of Immunology 208, no. 1_Supplement (May 1, 2022): 111.06. http://dx.doi.org/10.4049/jimmunol.208.supp.111.06.
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Abstract Free fatty acid accumulation in macrophages alters cellular metabolism, leading to failed inflammation resolution that contributes to cardiometabolic pathologies such as atherosclerotic cardiovascular disease. Free fatty acids are either broken down by β-oxidation, stored in glycerolipids, or incorporated into sphingolipids (e.g., ceramides). Ceramide synthesis inhibits several pro-resolving macrophage functions, such as β-oxidation and efferocytosis, needed for inflammation resolution. The regulatory signals that control free fatty acid incorporation into lipids (e.g., lipid channeling) for proper macrophage function are not well understood. Lipin-1 is a phosphatidic acid phosphatase with an independent transcriptional coregulatory activity that controls cellular lipid homeostasis. Using genetically engineered mice and bone marrow-derived macrophages, we investigated the contribution of lipin-1 on macrophage pro-resolving functions. Mice lacking myeloid-specific lipin-1 had defects in the clearance of apoptotic cells in a zymosan model of inflammation resolution, and these mice had increased atherosclerotic plaques and necrotic cores in a model of atherosclerosis and a delay excisional wound closure. Bone marrow-derived macrophages lacking lipin-1 showed a striking pattern of dysregulated lipid metabolism in which il-4 stimulation promoted ceramide synthesis over β-oxidation. Additionally, lipin-1 deficient macrophages had reduced phagocytosis of apoptotic cells. Our work provides evidence that lipin-1 promotes β-oxidation while inhibiting ceramide synthesis during free fatty acid accumulation in macrophages to allow for responses that promote inflammation resolution. Supported by grants from NIH (1 R01HL131844-04) and NIH (1P20GM134974-01A1)
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Kon, Takahide, Naoki Nemoto, Tairo Oshima, and Akihiko Yamagishi. "Effects of a Squalene Epoxidase Inhibitor, Terbinafine, on Ether Lipid Biosyntheses in a Thermoacidophilic Archaeon, Thermoplasma acidophilum." Journal of Bacteriology 184, no. 5 (March 1, 2002): 1395–401. http://dx.doi.org/10.1128/jb.184.5.1395-1401.2002.
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ABSTRACT The archaeal plasma membrane consists mainly of diether lipids and tetraether lipids instead of the usual ester lipids found in other organisms. Although a molecule of tetraether lipid is thought to be synthesized from two molecules of diether lipids, there is no direct information about the biosynthetic pathway(s) or intermediates of tetraether lipid biosynthesis. In this study, we examined the effects of the fungal squalene epoxidase inhibitor terbinafine on the growth and ether lipid biosyntheses in the thermoacidophilic archaeon Thermoplasma acidophilum. Terbinafine was found to inhibit the growth of T. acidophilum in a concentration-dependent manner. When growing T. acidophilum cells were pulse-labeled with [2-14C]mevalonic acid in the presence of terbinafine, incorporation of radioactivity into the tetraether lipid fraction was strongly suppressed, while accumulation of radioactivity was noted at the position corresponding to diether lipids, depending on the concentration of terbinafine. After the cells were washed with fresh medium and incubated further without the radiolabeled substrate and the inhibitor, the accumulated radioactivity in the diether lipid fraction decreased quickly while that in the tetraether lipids increased simultaneously, without significant changes in the total radioactivity of ether lipids. These results strongly suggest that terbinafine inhibits the biosynthesis of tetraether lipids from a diether-type precursor lipid(s). The terbinafine treatment will be a tool for dissecting tetraether lipid biosynthesis in T. acidophilum.
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Chime, Salome A., Paul A. Akpa, and Anthony A. Attama. "The Utility of Lipids as Nanocarriers and Suitable Vehicle in Pharmaceutical Drug Delivery." Current Nanomaterials 4, no. 3 (November 11, 2019): 160–75. http://dx.doi.org/10.2174/2405461504666191016091827.
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Lipid based excipients have gained popularity recently in the formulation of drugs in order to improve their pharmacokinetic profiles. For drugs belonging to the Biopharmaceutics Classification System (BCS) class II and IV, lipid excipients play vital roles in improving their pharmacokinetics properties. Various nanocarriers viz: Solid lipid nanoparticles, nanostructured lipid carriers, selfnanoemulsifying drug delivery systems (SNEDDS), nanoliposomes and liquid crystal nanoparticles have been employed as delivery systems for such drugs with evident successes. Lipid-based nanotechnology have been used to control the release of drugs and have utility for drug targeting and hence, have been used for the delivery of various anticancer drugs and for colon targeting. Drugs encapsulated in lipids have enhanced stability due to the protection they enjoy in the lipid core of these nanoformulations. However, lipid excipients could be influenced by factors which could affect the physicochemical properties of lipid-based drug delivery systems (LBDDS). These factors include the liquid crystalline phase transition, lipid crystallization and polymorphism amongst others. However, some of the physicochemical properties of lipids made them useful as nanocarriers in the formulation of various nanoformulations. Lipids form vesicles of bilayer which have been used to deliver drugs and are often referred to as liposomes and nanoliposomes. This work aims at reviewing the different classes of lipid excipients used in formulating LBDDS and nanoformulations. Also, some factors that influence the properties of lipids, different polymorphic forms in lipid excipients that made them effective nanocarriers in nano-drug delivery would be discussed. Special considerations in selecting lipid excipients used in formulating various forms of nanoformulations would be discussed.
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Nichols, Frank C., Bekim Bajrami, Robert B. Clark, William Housley, and Xudong Yao. "Free Lipid A Isolated from Porphyromonas gingivalis Lipopolysaccharide Is Contaminated with Phosphorylated Dihydroceramide Lipids: Recovery in Diseased Dental Samples." Infection and Immunity 80, no. 2 (December 5, 2011): 860–74. http://dx.doi.org/10.1128/iai.06180-11.
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ABSTRACTRecent reports indicate thatPorphyromonas gingivalismediates alveolar bone loss or osteoclast modulation through engagement of Toll-like receptor 2 (TLR2), though the factors responsible for TLR2 engagement have yet to be determined. Lipopolysaccharide (LPS) and lipid A, lipoprotein, fimbriae, and phosphorylated dihydroceramides ofP. gingivalishave been reported to activate host cell responses through engagement of TLR2. LPS and lipid A are the most controversial in this regard because conflicting evidence has been reported concerning the capacity ofP. gingivalisLPS or lipid A to engage TLR2 versus TLR4. In the present study, we first preparedP. gingivalisLPS by the Tri-Reagent method and evaluated this isolate for contamination with phosphorylated dihydroceramide lipids. Next, the lipid A prepared from this LPS was evaluated for the presence of phosphorylated dihydroceramide lipids. Finally, we characterized the lipid A by the matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) and electrospray-MS methods in order to quantify recovery of lipid A in lipid extracts from diseased teeth or subgingival plaque samples. Our results demonstrate that both the LPS and lipid A derived fromP. gingivalisare contaminated with phosphorylated dihydroceramide lipids. Furthermore, the lipid extracts derived from diseased teeth or subgingival plaque do not contain free lipid A constituents ofP. gingivalisbut contain substantial amounts of phosphorylated dihydroceramide lipids. Therefore, the free lipid A ofP. gingivalisis not present in measurable levels at periodontal disease sites. Our results also suggest that the TLR2 activation of host tissues attributed to LPS and lipid A ofP. gingivaliscould actually be mediated by phosphorylated dihydroceramides.
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Senevirathna, Jayan D. M., and Shuichi Asakawa. "Multi-Omics Approaches and Radiation on Lipid Metabolism in Toothed Whales." Life 11, no. 4 (April 20, 2021): 364. http://dx.doi.org/10.3390/life11040364.
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Lipid synthesis pathways of toothed whales have evolved since their movement from the terrestrial to marine environment. The synthesis and function of these endogenous lipids and affecting factors are still little understood. In this review, we focused on different omics approaches and techniques to investigate lipid metabolism and radiation impacts on lipids in toothed whales. The selected literature was screened, and capacities, possibilities, and future approaches for identifying unusual lipid synthesis pathways by omics were evaluated. Omics approaches were categorized into the four major disciplines: lipidomics, transcriptomics, genomics, and proteomics. Genomics and transcriptomics can together identify genes related to unique lipid synthesis. As lipids interact with proteins in the animal body, lipidomics, and proteomics can correlate by creating lipid-binding proteome maps to elucidate metabolism pathways. In lipidomics studies, recent mass spectroscopic methods can address lipid profiles; however, the determination of structures of lipids are challenging. As an environmental stress, the acoustic radiation has a significant effect on the alteration of lipid profiles. Radiation studies in different omics approaches revealed the necessity of multi-omics applications. This review concluded that a combination of many of the omics areas may elucidate the metabolism of lipids and possible hazards on lipids in toothed whales by radiation.
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Wang, Xuewei, Hai Bui, Prashanthi Vemuri, Jonathan Graff-Radford, Clifford R. Jack Jr, Ronald C. Petersen, and Michelle M. Mielke. "Lipidomic Network of Mild Cognitive Impairment from the Mayo Clinic Study of Aging." Journal of Alzheimer's Disease 81, no. 2 (May 18, 2021): 533–43. http://dx.doi.org/10.3233/jad-201347.
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Background: Lipid alterations contribute to Alzheimer’s disease (AD) pathogenesis. Lipidomics studies could help systematically characterize such alterations and identify potential biomarkers. Objective: To identify lipids associated with mild cognitive impairment and amyloid-β deposition, and to examine lipid correlation patterns within phenotype groups Methods: Eighty plasma lipids were measured using mass spectrometry for 1,255 non-demented participants enrolled in the Mayo Clinic Study of Aging. Individual lipids associated with mild cognitive impairment (MCI) were first identified. Correlation network analysis was then performed to identify lipid species with stable correlations across conditions. Finally, differential correlation network analysis was used to determine lipids with altered correlations between phenotype groups, specifically cognitively unimpaired versus MCI, and with elevated brain amyloid versus without. Results: Seven lipids were associated with MCI after adjustment for age, sex, and APOE4. Lipid correlation network analysis revealed that lipids from a few species correlated well with each other, demonstrated by subnetworks of these lipids. 177 lipid pairs differently correlated between cognitively unimpaired and MCI patients, whereas 337 pairs of lipids exhibited altered correlation between patients with and without elevated brain amyloid. In particular, 51 lipid pairs showed correlation alterations by both cognitive status and brain amyloid. Interestingly, the lipids central to the network of these 51 lipid pairs were not significantly associated with either MCI or amyloid, suggesting network-based approaches could provide biological insights complementary to traditional association analyses. Conclusion: Our attempt to characterize the alterations of lipids at network-level provides additional insights beyond individual lipids, as shown by differential correlations in our study.
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Warren, Charles R. "Altitudinal transects reveal large differences in intact lipid composition among soils." Soil Research 59, no. 6 (2021): 644. http://dx.doi.org/10.1071/sr20055.
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Fatty acid-based lipids comprise a small but important component of soil organic matter. Lipids are indispensable components of soil microbes due to their function as components of membranes and as stores of energy and C. Hence, lipid composition is likely under strong selection pressure and there ought to be strong associations between lipid composition of microbial communities and environmental conditions. Associations between microbial lipids and environment likely involve an integrated combination of differences in lipid headgroups (classes) and fatty acyl chains. However, past studies examining associations between soil lipid composition and environmental conditions have focussed on fatty acids hydrolysed from polar lipids and less is known about headgroups (classes) of polar lipids. The aim of this study was to examine associations between environmental conditions changing with altitude and the intact polar and non-polar lipids of soil microbial communities. We used two altitudinal transects, both spanning from forest through to above the alpine treeline, but separated from one another by ~700 km. Liquid chromatography-mass spectrometry identified 174 intact lipids to the level of class and sum composition. Approximately half of the pool of fatty acid-based lipids was accounted for by two classes of non-polar lipids (diacylglycerol and triacylglycerols), while the other half was dominated by three classes of polar lipids (phosphatidylethanolamine, phosphatidylcholine and diacylglyceryl-N,N,N-trimethylhomoserine). There were large differences among sites in the relative amounts of lipid classes. For example, diacylglyceryl-N,N,N-trimethylhomoserine varied among sites from 5 to 41% of the polar lipid pool, phosphatidylcholine from 31 to 60% of the polar lipid pool, and diacylglycerols from 9 to 53% of the total non-polar pool. Relationships of lipid composition with altitude were weak or differed between transects, and pH was the variable most strongly associated with lipid composition. Variation among sites in the relative abundance of phosphatidylcholine were positively associated with pH, while relative and absolute abundance of diacylglycerol was negatively related to pH. We suggest that the accumulation of diacylglycerol at low pH represents slowed hydrolysis and/or microbial utilisation. A large fraction of variance among sites in lipid composition remained unexplained, which highlights the need for additional research on processes leading to production and consumption of fatty acid-based lipids.
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Cabodevilla, Ainara G., Ni Son, and Ira J. Goldberg. "Intracellular lipase and regulation of the lipid droplet." Current Opinion in Lipidology 35, no. 2 (February 15, 2024): 85–92. http://dx.doi.org/10.1097/mol.0000000000000918.
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Purpose of review Lipid droplets are increasingly recognized as distinct intracellular organelles that have functions exclusive to the storage of energetic lipids. Lipid droplets modulate macrophage inflammatory phenotype, control the availability of energy for muscle function, store excess lipid, sequester toxic lipids, modulate mitochondrial activity, and allow transfer of fatty acids between tissues. Recent findings There have been several major advances in our understanding of the formation, dissolution, and function of this organelle during the past two years. These include new information on movement and partition of amphipathic proteins between the cytosol and lipid droplet surface, molecular determinants of lipid droplet formation, and pathways leading to lipid droplet hydrophobic lipid formation. Rapid advances in mitochondrial biology have also begun to define differences in their function and partnering with lipid droplets to modulate lipid storage versus oxidation. Summary This relationship of lipid droplets biology and cellular function provides new understanding of an important cellular organelle that influences muscle function, adipose lipid storage, and diseases of lipotoxicity.
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Das, U. N. "Lipids, lipid peroxidation and human health." Trends in Food Science & Technology 2 (January 1991): 44–45. http://dx.doi.org/10.1016/0924-2244(91)90616-q.
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Villanueva, Diana Y., Joseph B. Lim, and Jeffery B. Klauda. "Lipid Bilayers of Ester-Modified Lipids." Biophysical Journal 100, no. 3 (February 2011): 627a. http://dx.doi.org/10.1016/j.bpj.2010.12.3607.
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Jaiswal, Mamta, Ashley Schinske, and Rodica Pop-Busui. "Lipids and lipid management in diabetes." Best Practice & Research Clinical Endocrinology & Metabolism 28, no. 3 (June 2014): 325–38. http://dx.doi.org/10.1016/j.beem.2013.12.001.
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Boyd, Ben J., and Andrew J. Clulow. "The influence of lipid digestion on the fate of orally administered drug delivery vehicles." Biochemical Society Transactions 49, no. 4 (August 25, 2021): 1749–61. http://dx.doi.org/10.1042/bst20210168.
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This review will focus on orally administered lipid-based drug delivery vehicles and specifically the influence of lipid digestion on the structure of the carrier lipids and their entrained drug cargoes. Digestion of the formulation lipids, which are typically apolar triglycerides, generates amphiphilic monoglycerides and fatty acids that can self-assemble into a diverse array of liquid crystalline structures. Tracking the dynamic changes in self-assembly of the lipid digestion products during digestion has recently been made possible using synchrotron-based small angle X-ray scattering. The influence of lipid chain length and degree of unsaturation on the resulting lipid structuring will be described in the context of the critical packing parameter theory. The chemical and structural transformation of the formulation lipids can also have a dramatic impact on the physical state of drugs co-administered with the formulation. It is often assumed that the best strategy for drug development is to maximise drug solubility in the undigested formulation lipids and to incorporate additives to maintain drug solubility during digestion. However, it is possible to improve drug absorption using lipid digestion in cases where the solubility of the dosed drug or one of its polymorphic forms is greater in the digested lipids. Three different fates for drugs administered with digestible lipid-based formulations will be discussed: (1) where the drug is more soluble in the undigested formulation lipids; (2) where the drug undergoes a polymorphic transformation during lipid digestion; and (3) where the drug is more soluble in the digested formulation lipids.
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Cascianelli, Giacomo, Maristella Villani, Marcello Tosti, Francesca Marini, Elisa Bartoccini, Mariapia Viola Magni, and Elisabetta Albi. "Lipid Microdomains in Cell Nucleus." Molecular Biology of the Cell 19, no. 12 (December 2008): 5289–95. http://dx.doi.org/10.1091/mbc.e08-05-0517.
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It is known that nuclear lipids play a role in proliferation, differentiation, and apoptotic process. Cellular nuclei contain high levels of phosphatidylcholine and sphingomyelin, which are partially linked with cholesterol and proteins to form lipid–protein complexes. These lipids are also associated with transcription factors and newly synthesized RNA but, up to date, their organization is still unknown. The aim of the present work was to study if these specific lipid–protein interactions could be nuclear membrane microdomains and to evaluate their possible role. The results obtained demonstrate for the first time the existence of nuclear microdomains characterized by a specific lipid composition similar to that of intranuclear lipid–protein complexes previously described. Nuclear microdomain lipid composition changes during cell proliferation when the content of newly synthesized RNA increases. Because previous data show a correlation between nuclear lipids and transcription process, the role of nuclear microdomains in cellular functions is discussed.
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Saito, Kosuke, Kotaro Hattori, Shinsuke Hidese, Daimei Sasayama, Tomoko Miyakawa, Ryo Matsumura, Megumi Tatsumi, et al. "Profiling of Cerebrospinal Fluid Lipids and Their Relationship with Plasma Lipids in Healthy Humans." Metabolites 11, no. 5 (April 24, 2021): 268. http://dx.doi.org/10.3390/metabo11050268.
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Lipidomics provides an overview of lipid profiles in biological systems. Although blood is commonly used for lipid profiling, cerebrospinal fluid (CSF) is more suitable for exploring lipid homeostasis in brain diseases. However, whether an individual’s background affects the CSF lipid profile remains unclear, and the association between CSF and plasma lipid profiles in heathy individuals has not yet been defined. Herein, lipidomics approaches were employed to analyze CSF and plasma samples obtained from 114 healthy Japanese subjects. Results showed that the global lipid profiles differed significantly between CSF and plasma, with only 13 of 114 lipids found to be significantly correlated between the two matrices. Additionally, the CSF total protein content was the primary factor associated with CSF lipids. In the CSF, the levels of major lipids, namely, phosphatidylcholines, sphingomyelins, and cholesterolesters, correlated with CSF total protein levels. These findings indicate that CSF lipidomics can be applied to explore changes in lipid homeostasis in patients with brain diseases.
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Garcia, Chelsea, Catherine J. Andersen, and Christopher N. Blesso. "The Role of Lipids in the Regulation of Immune Responses." Nutrients 15, no. 18 (September 7, 2023): 3899. http://dx.doi.org/10.3390/nu15183899.
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Lipid metabolism plays a major role in the regulation of the immune system. Exogenous (dietary and microbial-derived) and endogenous (non-microbial-derived) lipids play a direct role in regulating immune cell activation, differentiation and expansion, and inflammatory phenotypes. Understanding the complexities of lipid–immune interactions may have important implications for human health, as certain lipids or immune pathways may be beneficial in circumstances of acute infection yet detrimental in chronic inflammatory diseases. Further, there are key differences in the lipid effects between specific immune cell types and location (e.g., gut mucosal vs. systemic immune cells), suggesting that the immunomodulatory properties of lipids may be tissue-compartment-specific, although the direct effect of dietary lipids on the mucosal immune system warrants further investigation. Importantly, there is recent evidence to suggest that lipid–immune interactions are dependent on sex, metabolic status, and the gut microbiome in preclinical models. While the lipid–immune relationship has not been adequately established in/translated to humans, research is warranted to evaluate the differences in lipid–immune interactions across individuals and whether the optimization of lipid–immune interactions requires precision nutrition approaches to mitigate or manage disease. In this review, we discuss the mechanisms by which lipids regulate immune responses and the influence of dietary lipids on these processes, highlighting compelling areas for future research.
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Galper, Jasmin, Woojin S. Kim, and Nicolas Dzamko. "LRRK2 and Lipid Pathways: Implications for Parkinson’s Disease." Biomolecules 12, no. 11 (October 30, 2022): 1597. http://dx.doi.org/10.3390/biom12111597.
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Genetic alterations in the LRRK2 gene, encoding leucine-rich repeat kinase 2, are a common risk factor for Parkinson’s disease. How LRRK2 alterations lead to cell pathology is an area of ongoing investigation, however, multiple lines of evidence suggest a role for LRRK2 in lipid pathways. It is increasingly recognized that in addition to being energy reservoirs and structural entities, some lipids, including neural lipids, participate in signaling cascades. Early investigations revealed that LRRK2 localized to membranous and vesicular structures, suggesting an interaction of LRRK2 and lipids or lipid-associated proteins. LRRK2 substrates from the Rab GTPase family play a critical role in vesicle trafficking, lipid metabolism and lipid storage, all processes which rely on lipid dynamics. In addition, LRRK2 is associated with the phosphorylation and activity of enzymes that catabolize plasma membrane and lysosomal lipids. Furthermore, LRRK2 knockout studies have revealed that blood, brain and urine exhibit lipid level changes, including alterations to sterols, sphingolipids and phospholipids, respectively. In human LRRK2 mutation carriers, changes to sterols, sphingolipids, phospholipids, fatty acyls and glycerolipids are reported in multiple tissues. This review summarizes the evidence regarding associations between LRRK2 and lipids, and the functional consequences of LRRK2-associated lipid changes are discussed.
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Talapatra, Jyotirmayee, and Mamatha M. Reddy. "Lipid Metabolic Reprogramming in Embryonal Neoplasms with MYCN Amplification." Cancers 15, no. 7 (April 4, 2023): 2144. http://dx.doi.org/10.3390/cancers15072144.
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Tumor cells reprogram their metabolism, including glucose, glutamine, nucleotide, lipid, and amino acids to meet their enhanced energy demands, redox balance, and requirement of biosynthetic substrates for uncontrolled cell proliferation. Altered lipid metabolism in cancer provides lipids for rapid membrane biogenesis, generates the energy required for unrestricted cell proliferation, and some of the lipids act as signaling pathway mediators. In this review, we focus on the role of lipid metabolism in embryonal neoplasms with MYCN dysregulation. We specifically review lipid metabolic reactions in neuroblastoma, retinoblastoma, medulloblastoma, Wilms tumor, and rhabdomyosarcoma and the possibility of targeting lipid metabolism. Additionally, the regulation of lipid metabolism by the MYCN oncogene is discussed.
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Saini, Ramesh Kumar, Parchuri Prasad, Xiaomin Shang, and Young-Soo Keum. "Advances in Lipid Extraction Methods—A Review." International Journal of Molecular Sciences 22, no. 24 (December 20, 2021): 13643. http://dx.doi.org/10.3390/ijms222413643.
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Extraction of lipids from biological tissues is a crucial step in lipid analysis. The selection of appropriate solvent is the most critical factor in the efficient extraction of lipids. A mixture of polar (to disrupt the protein-lipid complexes) and nonpolar (to dissolve the neutral lipids) solvents are precisely selected to extract lipids efficiently. In addition, the disintegration of complex and rigid cell-wall of plants, fungi, and microalgal cells by various mechanical, chemical, and enzymatic treatments facilitate the solvent penetration and extraction of lipids. This review discusses the chloroform/methanol-based classical lipid extraction methods and modern modifications of these methods in terms of using healthy and environmentally safe solvents and rapid single-step extraction. At the same time, some adaptations were made to recover the specific lipids. In addition, the high throughput lipid extraction methodologies used for liquid chromatography-mass spectrometry (LC-MS)-based plant and animal lipidomics were discussed. The advantages and disadvantages of various pretreatments and extraction methods were also illustrated. Moreover, the emerging green solvents-based lipid extraction method, including supercritical CO2 extraction (SCE), is also discussed.
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Xin, Ran, Lixin Ma, Rong Liu, Xuhui Huang, Baoshang Fu, Xiuping Dong, and Lei Qin. "Contribution of Lipids to the Flavor of Mussel (Mytilus edulis) Maillard Reaction Products." Foods 11, no. 19 (September 28, 2022): 3015. http://dx.doi.org/10.3390/foods11193015.
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Lipid oxidation and the Maillard reaction are two of the most important reactions affecting the flavor of foods that have been heat-processed. To investigate the contribution of lipids to the mussel’s flavor, the mussel’s Maillard reaction products (MRPs) were prepared with polar lipids (mainly phospholipids) and nonpolar lipids (mainly glycerides), respectively. The effects of polar and nonpolar lipids on the flavor of the MRPs were investigated by sensory evaluation, electronic tongue, electronic nose, ultra-performance liquid chromatography-mass-spectrometry (UPLC-MS) and gas chromatography-mass-spectrometry (GC-MS). From the sensory evaluation results, the polar lipid MRPs had the highest scores. The tastes of polar lipid MRPs and nonpolar lipid MRPs were mainly umami, saltiness and sourness, and there were significant differences in their sour tastes. The flavor compounds in the MRPs were mainly inorganic sulfides, organic sulfides and nitrogen oxides. The odor of polar lipid MRPs was stronger than that of nonpolar lipid MRPs, and the seafood flavor was more obvious. A total of 37 volatile compounds were detected by GC-MS, mainly aldehydes, alcohols and ketones. The addition of polar lipids helped the MRPs to produce more volatile compounds. A total of 177 non-volatile compounds (including amino acids and their derivatives and oligopeptides, etc.) were detected in the samples using UPLC-MS. The non-volatile compounds contained in the no-lipid MRPs, polar lipid MRPs and nonpolar lipid MRPs were significantly different. This study provides a theoretical basis and technical support for the production of mussel MRPs.
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Medjmedj, Ayoub, Albert Ngalle-Loth, Rudy Clemençon, Josef Hamacek, Chantal Pichon, and Federico Perche. "In Cellulo and In Vivo Comparison of Cholesterol, Beta-Sitosterol and Dioleylphosphatidylethanolamine for Lipid Nanoparticle Formulation of mRNA." Nanomaterials 12, no. 14 (July 17, 2022): 2446. http://dx.doi.org/10.3390/nano12142446.
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Lipid Nanoparticles (LNPs) are a leading class of mRNA delivery systems. LNPs are made of an ionizable lipid, a polyethyleneglycol (PEG)-lipid conjugate and helper lipids. The success of LNPs is due to proprietary ionizable lipids and appropriate helper lipids. Using a benchmark lipid (D-Lin-MC3) we compared the ability of three helper lipids to transfect dendritic cells in cellulo and in vivo. Studies revealed that the choice of helper lipid does not influence the transfection efficiency of immortalized cells but, LNPs prepared with DOPE (dioleylphosphatidylethanolamine) and β-sitosterol were more efficient for mRNA transfection in murine dendritic cells than LNPs containing DSPC (distearoylphosphatidylcholine). This higher potency of DOPE and β-sitosterol LNPs for mRNA expression was also evident in vivo but only at low mRNA doses. Overall, these data provide valuable insight for the design of novel mRNA LNP vaccines.
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Sarwal, Rashmi, S. N. Sanyal, and S. Khera. "Lipid metabolism inTrichuris globulosa(Nematoda)." Journal of Helminthology 63, no. 4 (December 1989): 287–97. http://dx.doi.org/10.1017/s0022149x00009160.
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ABSTRACTAdult males and females ofTrichuris globulosa, an intestinal nematode parasite of goats, were studied for their lipid composition, capability of incorporation of (Na)-1-14C-acetate into different lipid classes and the activity of certain key enzymes of lipid metabolism. The parasite possesses a large variety of lipids including certain complex lipids. These are phosphatidylcholine (PC), diphosphatidylglycerol (cardiolipin), lysophosphatidylcholine (LPC), lysophosphatidylethanolamine (LPE), phosphatidylserine (PS), phosphatidylinositol (PI), plasmalogens (choline+ethanolamine), mono-, di- and triacylglycerols, free and esterified cholesterol, non-esterified fatty acids (NEFA), gangliosides, cerebrosides (glycosyl ceramide) and sulphuric acid esters of cerebrosides (sulphatides). The females contain more lipids than males, particularly the acylglycerols and phospholipids, possibly to meet the energy requirement and structural entities for the daily production of large numbers of eggs. Incorporation studies of labelled substrate, sodium-1-14C acetate demonstrate that the adult female has extremely active mechanisms for biosynthesizing these lipids. Most of the labels are found in PC, PE, SM, acylglycerols, NEFA, gangliosides, cerebrosides and sulphatides. Cholesterol, although a minor component of the parasitic lipids, incorporates large amount of label and also undergoes fast turnover. Kinetic analysis of the incorporation by measuring the rate constant (k) and half life (t½) reveals that gangliosides are the fastest biosynthesizing and turning over lipids, although they constitute only 0·1% of the total lipids. The presence of important enzymes of lipid biosynthesis, glucose-6-phosphate dehydrogenase, malate dehydrogenase and hydroxymethyl glutaryl-CoA reductase and an enzyme of lipid ester hydrolysis, triacylglycerol lipase, is also established inT. globulosa. Michaelis-Menten kinetic characteristics of the parasitic enzymes (Km, Vmax, v and the first order rate constant, k) are comparable with those of rat liver homogenates.
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Quach, Hung, Tuong-Vi Le, Thanh-Thuy Nguyen, Phuong Nguyen, Cuu Khoa Nguyen, and Le Hang Dang. "Nano-Lipids Based on Ginger Oil and Lecithin as a Potential Drug Delivery System." Pharmaceutics 14, no. 8 (August 9, 2022): 1654. http://dx.doi.org/10.3390/pharmaceutics14081654.
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Lipid nanoparticles based on lecithin are an interesting part of drug delivery systems. However, the stability of lecithin nano-lipids is problematic due to the degradation of lecithin, causing a decrease in pH. In this study, the modification of the conventional nano-lipid-based soybean lecithin was demonstrated. Ginger-oil-derived Zingiber officinale was used along with lecithin, cholesterol and span 80 to fabricate nano-lipids (GL nano-lipids) using a thin-film method. TEM and a confocal microscope were used to elucidate GL nano-lipids’ liposome-like morphology. The average size of the resultant nano-lipid was 249.1 nm with monodistribution (PDI = 0.021). The ζ potential of GL nano-lipids was negative, similarly to as-prepared nano-lipid-based lecithin. GL nano-lipid were highly stable over 60 days of storage at room temperature in terms of size and ζ potential. A shift in pH value from alkaline to acid was detected in lecithin nano-lipids, while with the incorporation of ginger oil, the pH value of nano-lipid dispersion was around 7.0. Furthermore, due to the richness of shogaol-6 and other active compounds in ginger oil, the GL nano-lipid was endowed with intrinsic antibacterial activity. In addition, the sulforhodamine B (SRB) assay and live/dead imaging revealed the excellent biocompatibility of GL nano-lipids. Notably, GL nano-lipids were capable of carrying hydrophobic compounds such as curcumin and performed a pH-dependent release profile. A subsequent characterization showed their suitable potential for drug delivery systems.
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Nichols, Frank, and Baliram Maraj. "Relationship between Hydroxy Fatty Acids and Prostaglandin E2 in Gingival Tissue." Infection and Immunity 66, no. 12 (December 1, 1998): 5805–11. http://dx.doi.org/10.1128/iai.66.12.5805-5811.1998.
Full textAbstract:
ABSTRACT Bacterial hydroxy fatty acids and alpha-hydroxy fatty acids have been demonstrated in complex lipid extracts of subgingival plaque and gingival tissue. However, little is known about the relationship between these hydroxy fatty acids in plaque and gingival tissues or the significance of these complex lipids in promoting inflammatory periodontal disease. The present study determined the percentages of ester-linked and amide-linked hydroxy fatty acids in complex lipids recovered from plaque and gingival tissue samples and the relationship between bacterial hydroxy fatty acids and alpha-hydroxy fatty acids in the lipid extracts. To evaluate a potential role for these hydroxy fatty acids in inflammatory periodontal disease, gingival tissue samples were examined for a relationship between prostaglandin E2 (PGE2) and hydroxy fatty acids recovered in gingival lipid. This investigation demonstrated that alpha-hydroxy fatty acids are only ester linked in plaque lipids but are largely amide linked in gingival tissue lipids. Furthermore, the level of alpha-hydroxy fatty acid in gingival lipid is directly related to the level of the bacterial hydroxy fatty acid 3-OHiso-branched C17:0 (3-OH iC17:0) in the same lipid extract. However, the relationship between hydroxy fatty acids in gingival lipids does not parallel the fatty acid relationship observed in plaque lipids. Finally, alpha-hydroxy fatty acid levels in gingival tissue lipids correlate directly with the recovery of PGE2 in the same tissue samples. These results demonstrate that alpha-hydroxy fatty acid levels in gingival lipids are directly related to both 3-OH iC17:0 bacterial lipid levels and PGE2 levels. These results indicate that in periodontal tissues there are unusual host-parasite interactions involving penetration of bacterial lipid in association with an altered gingival lipid metabolism and prostaglandin synthesis.