Добірка наукової літератури з теми "Signal lipidique"
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Статті в журналах з теми "Signal lipidique":
Auger, Reginald, and Allison Bain. "Anthropologie et archéologie." Anthropen, 2016. http://dx.doi.org/10.17184/eac.anthropen.030.
Дисертації з теми "Signal lipidique":
Vaultier, Marie-Noëlle. "Etude de la perception et de la transduction du signal froid chez Arabidopsis thaliana : Implication des voies de signalisation lipidique." Paris 6, 2006. http://www.theses.fr/2006PA066223.
Cornille, Patrick. "Réponse des végétaux aux chocs oxydants : rôle de la péroxydation lipidique dans la signalisation cellulaire." Montpellier 2, 1998. http://www.theses.fr/1998MON20039.
Abdoul-Azize, Souleymane. "Implication de la signalisation calcique et des MAP kinases dans la perception gustative lipidique." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-01018378.
Poidevin, Mickaël. "La synthèse d'acides gras dans des cellules spécialisées agit à distance sur le processus d'activation des ovocytes chez la drosophile." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASL016.
A statistical study by the World Health Organization revealed that one adult over six is affected by infertility problems. This major social issue is complex and multifactorial, with worldwide trends that are difficult to assess. It is therefore essential to carry out more research to better understand not only the evolution of infertility, but also the cellular and molecular mechanisms leading to efficient fertility.Serendipitously, we discovered that a genetic screen to enzymes responsible for fatty acid synthesis in specialized Drosophila cells provoked a sterile phenotype. These specialized cells, called as oenocytes, are essential for fatty acid metabolism, and are involved in numerous processes, including lipid homeostasis, protection against desiccation and pheromonal communication.My work shows that the synthesis of one or more very long-chain fatty acids in oenocytes is essential for female fertility, and that a defect in this synthesis causes spermatozoa to be retaintion in the storage organs, spermathecae and seminal receptacle. I have shown that the sterility phenotype is not linked to a defect in sperm activity, and that sperm fertilize mature oocytes efficiently. On the other hand, my results indicate that the eggs show an activation defect preventing their development.In insects, activation of the mature oocyte, which leads to embryonic development, is not dependent on sperm entry as in mammals. This activation is triggered by a calcium signal while the oocyte moves through the female genital tract. Taken together, my results show for the first time that an extra-genital lipid-signal triggers the activation of mature oocytes, thus enabling the induction of embryonic development
Léger, Amandine. "Analyse fonctionnelle d'AtMYB30, un régulateur transcriptionnel impliqué dans la mort cellulaire hypersensible chez Arabidopsis thaliana." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/864/.
The molecular mechanisms underlying the Hypersensitive Response ( HR), a form of programmed cell death generally associated with the plant resistance, remain poorly understood. AtMYB30, a member of the family of MYB transcriptionnal factors, was identified on the basis of its specific, rapid and transient expression during the first stages of the HR in Arabidopsis thaliana. Furthermore, genetic and molecular approaches showed that AtMYB30 is a positive regulator of the HR. From these data and to further understand the mode of action of AtMYB30, three major questions were addressed in my thesis work : i) what are the direct targets of AtMYB30, ii) what about role of a close homolog of AtMYB30, AtMYB96? And iii) What role for AtMYB30 in cell death lipid signaling? Thus the regulatory role of AtMYB30 has been revealed in the generation of cell death signals via the activation of its target genes, belonging to the VLCFA (Very Long Chain Fatty Acid) biosynthesis pathway. Besides, the role of AtMYB96 was determined, acting through interaction with AtMYB30 and able to collaborate for the control of the hypersensitive cell death program at Arabidopsis thaliana
Casiraghi, Marina. "Functional modulation of a G protein-coupled receptor conformational landscape in a lipid bilayer." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC138/document.
G protein-coupled receptors (GPCRs) are the largest family of integral membrane protein receptors present in most eukaryotic cells. They play a key role in signal transduction and understanding their signalling mechanism represents one of the main issues in biology today. In the characterization of the energy landscape of these receptors, at the atomic scale, X-ray crystal atomic structures published during the last decade represent the major breakthrough and contribution in the structural biology of GPCRs. They represent a precious starting point in the understanding of the mechanism of signal transduction by placing structures in the conformational ensemble of these receptors along the activation pathway. To complete these static snapshots that correspond to low energy and highly populated states, a characterization of the whole conformational ensemble and associated kinetic barriers is fundamental to complete the picture. To this aim we proposed an innovative approach to observe GPCRs dynamic conformational landscape and how it is modulated by ligands and lipids, that are known to play a key role in membrane protein structures and functions (e.g.). One of the most appropriate tool to explore GPCR kinetic barriers is solution state NMR. To do so, we used 13CH3 probes immersed in a perdeuterated environment, the most appropriate isotope-labelling scheme to investigate conformational landscapes of large proteins or protein complexes with this spectroscopy. We chose Escherichia coli as expression system for its ability to grow in very hostile conditions like 100%-D2O solutions. In order to overcome the usual expression issues concerning GPCRs, we applied an innovative protocol which targets the expression directly to inclusion bodies. This allows the production of high amounts of proteins (up to 6 mg/litre of culture of pure 13CH3-u-2H-GPCRs). Once purified, receptors are folded in amphipols and then transferred to nanometric lipid bilayers or nanodiscs. Importantly quantitative pharmacological measurements indicate that receptors embedded in NLBs following this protocol are stable and fully active in the conditions of the NMR experiments. NMR investigation of a GPCR in a NLB gave rise to a resolution never achieved in the field thanks to a fine tuned biochemistry and a perdeuteration of the receptor. According to our data, the prototypical receptor, the leukotriene B4 receptor (BLT2), is able to explore multiple different conformations, even in the unliganded state, including the active state. This conformational landscape is further modulated by ligands and lipids. In particular, we observed that an increment in the sterol content of the membrane modifies the distribution of the different conformational states of the receptor in favour of the active one, indicating a positive allosteric regulation of the sterol on the activation of this receptor, as confirmed by GTP-to-G protein binding measurements. This property of the sterol is likely important for the control of the signalling properties of GPCRs
Lasserre, Rémi [Jacques Alain]. "Etude du rôle des microdomaines lipidiques dans le recrutement à la membrane et l'activation de PKB/Akt." Aix-Marseille 2, 2005. http://theses.univ-amu.fr.lama.univ-amu.fr/2005AIX22076.pdf.
Pernas, Pierre. "Contribution à l'étude des propriétés enzymatiques et des fonctions cellulaires de la phospholipase A2." Compiègne, 1992. http://www.theses.fr/1992COMPD483.
Neyraud, Vincent. "L'ubiquitination des GTPases Ral : Un nouveau mécanisme de régulation diu trafic intracellulaire de Ral et des micro-domaines menmbranaires lipidiques." Paris 11, 2010. http://www.theses.fr/2010PA11T085.
Pizon, Mathieu. "L'inhibition de la voie Phosphoinositide-3 kinase (PI3K)/AKT induit un signal apoptotique via la redistribution du récepteur de mort CD95 dans les radeaux lipidiques." Thesis, Bordeaux 2, 2010. http://www.theses.fr/2010BOR21710/document.
CD95 belongs to the TNF-R superfamily, and it triggers an apoptotic signal. CD95 plays a key role in homeostasis of the immune system and in the elimination of infected and transformed cells. Upon CD95L binding, CD95 recruits FADD, which in turn aggregates initiator caspases (i.e., caspase-8 and -10). The complex CD95, FADD and caspase-8/10 is called DISC for Death Inducing Signaling Complex. At the DISC level, caspase aggregation leads to their activation and death of the cells through apoptosis. The CD95-mediated apoptotic signal is modulated by microdomains, or lipid rafts, which are plasma membrane sub-domains enriched in sphygolipids and cholesterol. Thereby, partition of CD95 into lipid rafts promotes the apoptotic signal. Activation of the phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway is known to prevent the CD95-mediated apoptotic signal in malignant cells, and to control lateral mobility of CD95 at the plasma membrane. Herein, we showed that inhibition of PI3K signal induced i) the distribution of CD95 into lipid rafts and ii) the subsequent induction of the CD95-mediated apoptotic signal through a CD95L independent manner. In conclusion, we pinpointed that PI3K/Akt signaling pathway inhibits the CD95 signal by acting upstream DISC formation and even upstream the CD95-CD95L interaction through the exclusion of the death receptor from the microdomains
Книги з теми "Signal lipidique":
Vance, Dennis E. Biochemistry of lipids, lipoproteins and membranes. 5th ed. Amsterdam: Elsevier, 2008.
(Editor), D. E. Vance, and J. E. Vance (Editor), eds. Biochemistry of Lipids, Lipoproteins and Membranes, Fifth Edition. 5th ed. Elsevier Science, 2008.