Bibliografias temáticas / Theacrine

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Literatura científica selecionada sobre o tema "Theacrine"

Autor: Grafiati

Publicado: 9 de outubro de 2024

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Artigos de revistas sobre o assunto "Theacrine"

Chen, Xiaomin, Shuxian Shao, Ruxing Yang, Mengya Gu, Pengjie Wang, Feng Zhao e Naixing Ye. "Identification of Co-Expressed Genes Related to Theacrine Synthesis in Tea Flowers at Different Developmental Stages". International Journal of Molecular Sciences 22, n.º 24 (13 de dezembro de 2021): 13394. http://dx.doi.org/10.3390/ijms222413394.

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Jiaocheng kucha is the first reported tea germplasm resource which contains theacrine founded in Fujian Province. Currently, the anabolic mechanism of theacrine within tea leaves is clear, but there are few studies focused on its flowers. In order to further explore the mechanism of theacrine synthesis and related genes in flowers, current study applied Jiaocheng kucha flowers (JC) as test materials and Fuding Dabaicha flowers (FD) as control materials to make transcriptome sequencing, and determination of purine alkaloid content in three different developmental periods (flower bud stage, whitening stage and full opening stage). The results showed that the flower in all stages of JC contained theacrine. The theacrine in the flower bud stage was significantly higher than in the other stages. The differentially expressed genes (DEGs) at three different developmental stages were screened from the transcriptome data, and were in a total of 5642, 8640 and 8465. These DEGs related to the synthesis of theacrine were primarily annotated to the pathways of purine alkaloids. Among them, the number of DEGs in xanthine synthesis pathway was the largest and upregulated in JC, while it was the smallest in caffeine synthesis pathway and downregulated in JC. Further weighted gene co-expression network (WGCNA) indicated that ADSL (CsTGY03G0002327), ADSL (CsTGY09G0001824) and UAZ (CsTGY06G0002694) may be a hub gene for the regulation of theacrine metabolism in JC. Our results will contribute to the identification of candidate genes related to the synthesis of theacrine in tea flowers, and explore the molecular mechanism of theacrine synthesis in JC at different developmental stages.

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Yang, Maoxian, Peng Shen, Longsheng Xu, Min Kong, Congcong Yu e Yunchao Shi. "Theacrine alleviates sepsis-induced acute kidney injury by repressing the activation of NLRP3/Caspase-1 inflammasome". PeerJ 10 (4 de outubro de 2022): e14109. http://dx.doi.org/10.7717/peerj.14109.

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Acute kidney injury (AKI) is a frequent and serious complication of sepsis, which results in a rapid decline of kidney function. Currently, there are no curative therapies for AKI. Theacrine is a purine alkaloid and exerts significant role in regulating inflammation, oxidative stress, and mood elevation. The study aims to evaluate the biological role and potential mechanism of theacrine in septic AKI. The murine and cellular models of septic AKI were established in lipopolysaccharide (LPS)-treated C57BL/6 mice and HK-2 cells, respectively. The effect of theacrine on alleviating septic AKI was assessed after pretreatment with theacrine in vivo and in vitro. We found that theacrine treatment significantly alleviated LPS-induced kidney injury, as evidenced by decreased levels of kidney injury markers (blood urea nitrogen and creatinine), inflammatory factors (IL-1β and IL-18), and cell apoptosis in vivo and in vitro. Mechanistically, theacrine markedly repressed the activation of NOD-like receptor (NLR) pyrin domain-containing protein 3 (NLRP3)inflammasome. As expected, MCC950 (a specific inhibitor of NLRP3) treatment also decreased LPS-induced production of IL-18 and IL-1β and cell apoptosis in HK-2 cells. More important, Nigericin sodiumsalt (a NLRP3 agonist) damaged the effect of theacrine on repressing kidney injury markers (blood urea nitrogen and creatinine), pro-inflammatory cytokines (IL-18 and IL-1β), and cell apoptosis. Taken together, these results demonstrate that theacrine alleviates septic AKI, at least in part by repressing the activation of NLRP3 inflammasome.

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Jhuo, Cian-Fen, Yu-Yu Hsu, Wen-Ying Chen e Jason T. C. Tzen. "Attenuation of Tumor Development in Mammary Carcinoma Rats by Theacrine, an Antagonist of Adenosine 2A Receptor". Molecules 26, n.º 24 (9 de dezembro de 2021): 7455. http://dx.doi.org/10.3390/molecules26247455.

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Caffeine has been reported to induce anti-tumor immunity for attenuating breast cancer by blocking the adenosine 2A receptor. Molecular modeling showed that theacrine, a purine alkaloid structurally similar to caffeine, might be an antagonist of the adenosine 2A receptor equivalent to or more effective than caffeine. Theacrine was further demonstrated to be an effective antagonist of the adenosine 2A receptor as its concurrent supplementation significantly reduced the elevation of AMPK phosphorylation level in MCF-7 human breast cells induced by CGS21680, an agonist of adenosine 2A receptors. In an animal model, the development of mammary carcinoma induced by 7,12-Dimethylbenz[a]anthracene in Sprague–Dawley rats could be attenuated by daily supplement of theacrine of 50 or 100 mg/kg body weight. Both expression levels of cleaved-caspase-3/pro-caspase-3 and granzyme B in tumor tissues were significantly elevated when theacrine was supplemented, indicating the induction of programmed cell death in tumor cells might be involved in the attenuation of mammary carcinoma. Similar to the caffeine, significant elevation of interferon-γ and tumor necrosis factor-α was observed in the serum and tumor tissues of rats after the theacrine supplement of 50 mg/kg body weight. Taken together, theacrine is an effective antagonist of adenosine 2A receptors and possesses great potential to be used to attenuate breast cancer.

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Cerqueira, H. Santa Capita, H. Tourinho Filho, M. Corrêa e C. E. Martinelli. "Theacrine does not enhance physical performance or training status over 8 weeks". Comparative Exercise Physiology 18, n.º 2 (22 de fevereiro de 2022): 171–77. http://dx.doi.org/10.3920/cep210034.

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Fatigue is a condition that may affect physical performance during training sessions. Consequently, this will impact training performance and will also affect the performance of the individual in the long term. Caffeine is extensively used to counteract fatigue; however, it contains several side effects. Theacrine might be used as an alternative to caffeine, providing the same benefits without the side effects. The current study aimed to investigate the effects of 8 weeks of supplementation with theacrine on physical performance and training status of young amateur athletes. Twenty-two subjects were divided into two groups – Theacrine Group (T) and Placebo Group (P) – and evaluated before and after the intervention period. Evaluations included physical tests and hormonal values of insulin like growth factor (IGF)-I and IGF binding protein (IGFBP)-3, used as markers of training status. Results demonstrated that theacrine was not capable of promoting benefits regarding the physical performance of the subjects. It also had no effects on serum secretion of IGF-I and its binding protein, IGFBP-3. Therefore, the findings of this study do not support the use of theacrine to increase physical performance.

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Song, Qitai, Yao Liu e Ye Tian. "Theacrine alleviates inflammation and lung injury in septic mice by mediating SIRT3". Tropical Journal of Pharmaceutical Research 22, n.º 11 (10 de janeiro de 2024): 2259–64. http://dx.doi.org/10.4314/tjpr.v22i11.3.

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Purpose: To evaluate the effect of theacrine on sepsis progression and sepsis-induced lung injury and its mechanism of action. Methods: Lung injury model of lipopolysaccharide (LPS)-induced sepsis was made in the mice by injected with 3 mg/kg LPS dissolved in 50 μL PBS or only PBS (control group = 10). The remaining three groups (divided into ten mice per group) were administered theacrine (10, 20, and 40 mg/kg), by oral gavage 1 hour after LPS treatment. Hematoxylin and eosin (H&E) staining was performed to confirm the effect of theacrine on lung injury. Quantitative polymerase chain reaction (qPCR) and enzyme-linked immunosorbent assay (ELISA) were conducted to determine inflammatory and oxidative stress factors. TUNEL as well as immunoblot assays were carried to confirm its effect on apoptosis and mechanism of action. Results: Theacrine significantly improved lung injury as well as lung relief score in LPS-induced sepsis mice (p < 0.01) and it significantly reversed the increased levels of inflammatory cytokines in a dose-dependent manner in LPS-induced sepsis mice (p < 0.01), In addition, theacrine administration significantly reduced the increased intensity of ROS and MDA levels, and significantly improved the levels of SOD in lung tissues (p < 0.01). Furthermore, it improved LPS-induced apoptosis of lung tissue cells and alleviated lung injury by significantly activating SIRT3 pathway (p < 0.01). Conclusion: Theacrine alleviates inflammation and lung injury in septic mice by mediating SIRT3, thereby making it a potential lead in the development of drugs against sepsis-related inflammation and lung injury.

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Mumford, Petey W., Shelby C. Osburn, Carlton D. Fox, Joshua S. Godwin e Michael D. Roberts. "A Theacrine-Based Supplement Increases Cellular NAD+ Levels and Affects Biomarkers Related to Sirtuin Activity in C2C12 Muscle Cells In Vitro". Nutrients 12, n.º 12 (3 de dezembro de 2020): 3727. http://dx.doi.org/10.3390/nu12123727.

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There is evidence in rodents to suggest that theacrine-based supplements modulate tissue sirtuin activity as well as other biological processes associated with aging. Herein, we examined if a theacrine-based supplement (termed NAD3) altered sirtuin activity in vitro while also affecting markers of mitochondrial biogenesis. The murine C2C12 myoblast cell line was used for experimentation. Following 7 days of differentiation, myotubes were treated with 0.45 mg/mL of NAD3 (containing ~2 mM theacrine) for 3 and 24 h (n = 6 treatment wells per time point). Relative to control (CTL)-treated cells, NAD3 treatments increased (p < 0.05) Sirt1 mRNA levels at 3 h, as well as global sirtuin activity at 3 and 24 h. Follow-up experiments comparing 24 h NAD3 or CTL treatments indicated that NAD3 increased nicotinamide phosphoribosyltransferase (NAMPT) and SIRT1 protein levels (p < 0.05). Cellular nicotinamide adenine dinucleotide (NAD+) levels were also elevated nearly two-fold after 24 h of NAD3 versus CTL treatments (p < 0.001). Markers of mitochondrial biogenesis were minimally affected. Although these data are limited to select biomarkers in vitro, these preliminary findings suggest that a theacrine-based supplement can modulate select biomarkers related to NAD+ biogenesis and sirtuin activity. However, these changes did not drive increases in mitochondrial biogenesis. While promising, these data are limited to a rodent cell line and human muscle biopsy studies are needed to validate and elucidate the significance of these findings.

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Roberts, Michael D., Shelby C. Osburn, Joshua S. Godwin, Bradley A. Ruple, Michael B. La Monica, Betsy Raub, Jennifer E. Sandrock, Tim N. Ziegenfuss e Hector L. Lopez. "Enhance Trial: Effects of NAD3® on Hallmarks of Aging and Clinical Endpoints of Health in Middle Aged Adults: A Subset Analysis Focused on Blood Cell NAD+ Concentrations and Lipid Metabolism". Physiologia 2, n.º 1 (21 de março de 2022): 20–31. http://dx.doi.org/10.3390/physiologia2010002.

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Limited pre-clinical and clinical data suggest theacrine or theacrine-based supplements modulate biological processes associated with lipid metabolism and aging. Herein, we sought to examine if 12 weeks of daily supplementation with a theacrine-based supplement (termed NAD3®; 312 mg of combined Wasabia japonica freeze-dried rhizome standardized for isothicyantes, theacrine, and copper (I)niacin chelate) altered serum lipids as well as select nicotinamide adenine dinucleotide (NAD+)-associated metabolites in peripheral blood mononuclear cells (PBMCs). Twenty-eight participants (12 males, 16 females) were randomly assigned to receive either NAD3 (n = 13; age: 52 ± 7 years old, body mass index: 29.0 ± 5.0 kg/m2) or a cellulose placebo (n = 15; age: 51 ± 5 years old, body mass index: 28.3 ± 3.9 kg/m2). Blood samples were obtained in mornings following overnight fasts prior to supplementation (Pre) and following the 12-week intervention (Post). PBMCs were freshly isolated and prepared for targeted NAD+ metabolomics, and serum as well as whole blood was assayed for blood lipids and other safety markers through a commercial laboratory. Significant interactions (p < 0.05) were observed for total cholesterol, LDL cholesterol, and LDL: HDL ratio and post hoc analyses indicated these biomarkers significantly decreased with NAD3 supplementation (Pre-to-Post percent decreases were 11.1, 15.2, and −18.9%, respectively). A significant interaction was also observed for PBMC NAD+: NADH values, where levels trended downward from Pre to Post in the CTL group (p = 0.081) and values at Post were greater in NAD3 versus CTL (p = 0.023). No interactions were observed for systolic/diastolic blood pressure, body mass, or blood markers indicative of clinical safety. Although participant numbers were limited, these first-in-human data demonstrate a theacrine-based NAD3 supplement can favorably alter biomarkers of lipid metabolism and cellular NAD+ status. However, the latter data are limited to targeted NAD+ metabolites, and the effects of supplementation on other cellular metabolites or mechanisms related to the observed outcomes need to be further explored.

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Cerqueira, Henrique Santa Capita, Hugo Tourinho Filho, Marcos Corrêa Junior e Carlos Eduardo Martinelli Junior. "Effects of Theacrine as a Pre-Workout Supplement". International Journal of Environmental Research and Public Health 19, n.º 21 (28 de outubro de 2022): 14037. http://dx.doi.org/10.3390/ijerph192114037.

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The search to increase physical performance is inherent to physical activity practitioners, and nutrition features are among the alternatives to seeking such an increase. The literature from the area has shown that different substances can promote beneficial effects over physical performance. One substance that has come into the spotlight is theacrine, an alkaloid similar to caffeine, which aims to increase physical performance. However, the studies on this supplement are scarce. Therefore, this study is a randomized, controlled trial that aimed to verify the effects of theacrine supplementation over physical performance in young male athletes, by applying a battery of physical tests. Twenty-two male amateur flag-football athletes were recruited. Subjects were divided into two groups and assessed at two moments, which were 72 h apart. The first assessment served as a basal measurement. In the second, the subjects ingested the supplement or a placebo 60 min before the following tests: sextuple jump, agility T test, 30 m sprint, 40 s run test (Matsudo test), and 12 min run test (Cooper test). There was no difference between the groups in any of the tests. Therefore, the findings of this study do not support the use of theacrine to increase physical performance.

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Kato, Misako, e Hiroshi Ashihara. "Biosynthesis and Catabolism of Purine Alkaloids in Camellia Plants". Natural Product Communications 3, n.º 9 (setembro de 2008): 1934578X0800300. http://dx.doi.org/10.1177/1934578x0800300907.

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A few Camellia plants accumulate caffeine, theobromine and theacrine. The present article reviews the distribution of purine alkaloids and biosynthetic pathways, including properties and genes of the caffeine synthase family of enzymes, and catabolism. Plant physiological studies and ecology-related studies are also summarized briefly.

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Shi, Yu, Shao-Rong Zhang, Kang Sun, Xing-Hua Wang, Jie-ling Jiang, li-Yong Luo e Liang Zeng. "Characterization of bitter taste theacrine in Pu-erh tea". Journal of Food Composition and Analysis 106 (março de 2022): 104331. http://dx.doi.org/10.1016/j.jfca.2021.104331.

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