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AMPK AND Sirt1

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https://www.readbyqxmd.com/read/28804683/erratum-leucine-nicotinic-acid-synergy-stimulates-ampk-sirt1-signaling-and-regulates-lipid-metabolism-and-lifespan-in-caenorhabditis-elegans-and-hyperlipidemia-and-atherosclerosis-in-mice
#1
Antje Bruckbauer, Jheelam Banerjee, Qiang Cao, Xin Cui, Jia Jing, Lin Zha, Fenfen Li, Bingzhong Xue, Hang Shi, Michael B Zemel
[This corrects the article on p. 33 in vol. 7, PMID: 28533928.].
2017: American Journal of Cardiovascular Disease
https://www.readbyqxmd.com/read/28803067/ppargc1a-is-upregulated-and-facilitates-lung-cancer-metastasis
#2
Jin-Dong Li, Qing-Chuan Feng, Yu Qi, Guanghui Cui, Song Zhao
Lung cancer remains a leading cause of cancer-related mortality, with metastatic progression remaining the single largest cause of lung cancer mortality. Hence it is imperative to determine reliable biomarkers for lung cancer prognosis. We performed quantitative real-time PCR (qRT-PCR) analysis to explore epithelial-mesenchymal transition (EMT) inducers that regulate EMT process in three patients with advanced lung cancer disease. Peroxisome proliferator-activated receptor gamma (PPARGC1A) was uniformly the topmost overexpressed gene in all three human non-small cell lung cancer (NSCLC) patient samples...
August 9, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28799785/anthocyanins-anthocyanidins-and-colorectal-cancer-what-is-behind-the-scenes
#3
Luís Fernando de Sousa Moraes, Xiaofei Sun, Maria do Carmo Gouveia Peluzio, Mei-Jun Zhu
Colorectal cancer (CRC) is one of the most common cause of cancer death. Phytochemicals, especially anthocyanins/anthocyanidins (A/A), have gathered attention of the scientific community owing to its anti-inflammatory, antioxidant, and cancer-inhibitory properties. In this review, we discussed the possible mechanisms whereby A/A exhibit intestinal anticarcinogenic characteristics. Anthocyanins/anthocyanidins inhibit the pro-inflammatory NF-κB pathway, attenuate Wnt signaling and suppress abnormal epithelial cell proliferation...
August 11, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28789977/ablation-of-systemic-sirt1-activity-promotes-nonalcoholic-fatty-liver-disease-by-affecting-liver-mesenteric-adipose-tissue-fatty-acid-mobilization
#4
Junrui Cheng, Chun Liu, Kangquan Hu, Andrew Greenberg, Dayong Wu, Lynne M Ausman, Michael W McBurney, Xiang-Dong Wang
Sirtuin 1 (SIRT1) has been reported to protect against nonalcoholic fatty liver disease (NAFLD) development. The mechanism of how SIRT1 deacetylase activity affects NAFLD has not been well investigated. The current investigation addressed the causal effect of systemic SIRT1 activity on NAFLD development and the underlying mechanism involved in both liver and mesenteric adipose tissue (MAT). Both SIRT1 homozygous mice ablated the catalytic activity (sirt1(Y/Y)) and their corresponding wild type littermates (WT) were fed a high fat diet (HFD, 60% calories from fat) for 34weeks...
August 5, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28756945/sirt1-functions-as-a-negative-regulator-of-eukaryotic-poly-a-rna-transport
#5
Peipei Shan, Guangjian Fan, Lianhui Sun, Jinqin Liu, Weifang Wang, Chen Hu, Xiaohong Zhang, Qiwei Zhai, Xiaoyu Song, Liu Cao, Yongping Cui, Shengping Zhang, Chuangui Wang
Most eukaryotic mRNAs are polyadenylated in the nucleus, and the poly(A)-tail is required for efficient mRNA export and translation. However, mechanisms governing mRNA transport remain unclear. Here, we report that the nicotinamide adenine dinucleotide (NAD)-dependent deacetylase SIRT1 acts as an energy sensor and negatively regulates poly(A)RNA transport via deacetylating a poly(A)-binding protein, PABP1. Upon energy starvation, SIRT1 interacts with and deacetylates PABP1 and deactivates its poly(A)RNA binding, leading to nuclear accumulation of PABP1 and poly(A)RNA and thus facilitating eukaryotic cells to attenuate protein synthesis and energy consumption to adapt to energy stress...
August 7, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28751004/polyphenols-activate-energy-sensing-network-in-insulin-resistant-models
#6
Radika Mutlur Krishnamoorthy, Anuradha Carani Venkatraman
Unhealthy diet deficient in fruits and vegetables but rich in calories is considered to be one factor responsible for the increased prevalence of insulin resistance and type 2 diabetes (T2D). The consumption of fast foods and soft drinks increases fructose consumption per se and this is of major concern since prolonged fructose intake induces insulin resistance and thereby T2D. The energy homeostasis is regulated by a network consisting of "fuel gauze" called AMP-activated protein kinase (AMPK), the NAD(+) dependent type III deacetylase (SIRT1) and peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) which is disrupted in T2D...
July 24, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28744004/sirt1-negatively-regulates-fc%C3%AE%C2%B5ri-mediated-mast-cell-activation-through-ampk-and-ptp1b-dependent-processes
#7
Xian Li, Youn Ju Lee, Fansi Jin, Young Na Park, Yifeng Deng, Youra Kang, Ju Hye Yang, Jae-Hoon Chang, Dong-Young Kim, Jung-Ae Kim, Young-Chae Chang, Hyun-Jeong Ko, Cheorl-Ho Kim, Makoto Murakami, Hyeun Wook Chang
Sirt1, a key regulator of metabolism and longevity, has recently been implicated in the regulation of allergic reactions, although the underlying mechanism remains unclear. Here we show that Sirt1 negatively regulates FcεRI-stimulated mast cell activation and anaphylaxis through two mutually regulated pathways involving AMP-activated protein kinase (AMPK) and protein tyrosine phosphatase 1B (PTP1B). Mast cell-specific knockout of Sirt1 dampened AMPK-dependent suppression of FcεRI signaling, thereby augmenting mast cell activation both in vitro and in vivo...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728079/probucol-ameliorates-renal-injury-in-diabetic-nephropathy-by-inhibiting-the-expression-of-the-redox-enzyme-p66shc
#8
Shikun Yang, Li Zhao, Yachun Han, Yu Liu, Chao Chen, Ming Zhan, Xiaofen Xiong, Xuejing Zhu, Li Xiao, Chun Hu, Fuyou Liu, Zhiguang Zhou, Yashpal S Kanwar, Lin Sun
AIMS: Probucol is an anti-hyperlipidemic agent and a potent antioxidant drug that can delay progression of diabetic nephropathy (DN) and reverses renal oxidative stress in diabetic animal models; however, the mechanisms underlying these effects remain unclear. p66Shc is a newly recognized mediator of mitochondrial ROS production in renal cells under high-glucose (HG) ambience. We previously showed that p66Shc can serve as a biomarker for renal oxidative injury in DN patients and that p66Shc up-regulation is correlated with renal damage in vivo and in vitro...
July 4, 2017: Redox Biology
https://www.readbyqxmd.com/read/28721811/moving-to-the-rhythm-with-clock-circadian-genes-autophagy-mtor-and-sirt1-in-degenerative-disease-and-cancer
#9
Kenneth Maiese
BACKGROUND: The mammalian circadian clock and its associated clock genes are increasingly be recognized as critical components for a number of physiological and disease processes that extend beyond hormone release, thermal regulation, and sleep-wake cycles. New evidence suggests that clinical behavior disruptions that involve prolonged shift work and even space travel may negatively impact circadian rhythm and lead to multi-system disease. METHODS: In light of the significant role circadian rhythm can hold over the body's normal physiology as well as disease processes, we examined and discussed the impact circadian rhythm and clock genes hold over lifespan, neurodegenerative disorders, and tumorigenesis...
July 17, 2017: Current Neurovascular Research
https://www.readbyqxmd.com/read/28717968/deletion-of-type-2-cannabinoid-receptor-induces-alzheimer-s-disease-like-tau-pathology-and-memory-impairment-through-ampk-gsk3%C3%AE-pathway
#10
Lin Wang, Bing-Jin Liu, Yun Cao, Wei-Qi Xu, Dong-Sheng Sun, Meng-Zhu Li, Fang-Xiao Shi, Man Li, Qing Tian, Jian-Zhi Wang, Xin-Wen Zhou
Although several studies have shown that type-2 cannabinoid receptor (CB2R) is involved in Alzheimer's disease (AD) pathology, the effects of CB2R on AD-like tau abnormal phosphorylation and its underlying mechanism remain unclear. Herein, we employed the CB2R(-/-) mice as the animal model to explore roles of CB2R in regulating tau phosphorylation and brain function. We found that CB2R(-/-) mice display AD-like tau hyperphosphorylation, hippocampus-dependent memory impairment, increase of GSK3β activity, decrease of AMPK and Sirt1 activity and mitochondria dysfunction...
July 17, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28708087/resveratrol-induced-amp-activated-protein-kinase-activation-is-cell-type-dependent-lessons-from-basic-research-for-clinical-application
#11
Fan Lan, Karen A Weikel, Jose M Cacicedo, Yasuo Ido
Despite the promising effects of resveratrol, its efficacy in the clinic remains controversial. We were the first group to report that the SIRT1 activator resveratrol activates AMP-activated protein kinase (AMPK) (Diabetes 2005; 54: A383), and we think that the variability of this cascade may be responsible for the inconsistency of resveratrol's effects. Our current studies suggest that the effect of SIRT1 activators such as resveratrol may not be solely through activation of SIRT1, but also through an integrated effect of SIRT1-liver kinase B1 (LKB1)-AMPK...
July 14, 2017: Nutrients
https://www.readbyqxmd.com/read/28707280/multi-regulatory-network-of-ros-the-interconnection-of-ros-pgc-1-alpha-and-ampk-sirt1-during-exercise
#12
REVIEW
Anand Thirupathi, Claudio Teodoro de Souza
Transcriptional factors are easily susceptible to any stimuli, including exercise. Exercise can significantly influence PGC-1 α and AMPK-SIRT1 pathway, as it is involved in the regulation of energy metabolism and mitochondrial biogenesis. Exercise is a major energy deprivation process by which many of transcription factors get tuned positively. However, how transcription factors help to boost the antioxidant defense system at cellular level is elusive. It is well known that physical exercise can induce reactive oxygen species, but how these reactive oxygen species can help to regulate multiple transcription factors during exercise is an important area to be discussed yet...
July 14, 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28706491/early-life-exposure-to-lead-induces-cognitive-impairment-in-elder-mice-targeting-sirt1-phosphorylation-and-oxidative-alterations
#13
Lijie Zhang, Runqi Tu, Yawei Wang, Yazhen Hu, Xing Li, Xuemin Cheng, Yanyan Yin, Wenjie Li, Hui Huang
Pb is a potential risk factor for cognition, mainly mediated by enhanced oxidative stress. Resveratrol, a natural polyphenol with crucial anti-oxidative property, is recently implicated in preventing cognitive deficits in normal aging and neurodegenerative disorders. Its beneficial effects have been linked to sirtuin 1(SIRT1) activation. The aim of this work is to investigate the possible linkage between alterations in Pb-induced oxidative damage and cognitive impairment by prolonged treatment of resveratrol...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28696376/lack-of-additive-effects-of-resveratrol-and-energy-restriction-in-the-treatment-of-hepatic-steatosis-in-rats
#14
Iñaki Milton-Laskibar, Leixuri Aguirre, Alfredo Fernández-Quintela, Anabela P Rolo, João Soeiro Teodoro, Carlos M Palmeira, María P Portillo
The aims of the present study were to analyze the effect of resveratrol on liver steatosis in obese rats, to compare the effects induced by resveratrol and energy restriction and to research potential additive effects. Rats were initially fed a high-fat high-sucrose diet for six weeks and then allocated in four experimental groups fed a standard diet: a control group, a resveratrol-treated group, an energy restricted group and a group submitted to energy restriction and treated with resveratrol. We measured liver triacylglycerols, transaminases, FAS, MTP, CPT1a, CS, COX, SDH and ATP synthase activities, FATP2/FATP5, DGAT2, PPARα, SIRT1, UCP2 protein expressions, ACC and AMPK phosphorylation and PGC1α deacetylation...
July 11, 2017: Nutrients
https://www.readbyqxmd.com/read/28686680/resveratrol-ameliorates-diet-induced-dysregulation-of-lipid-metabolism-in-zebrafish-danio-rerio
#15
Gai Ran, Li Ying, Lin Li, Qiaoqiao Yan, Weijie Yi, Chenjiang Ying, Hongmei Wu, Xiaolei Ye
Defective lipid metabolism is associated with increased risk of various chronic diseases, such as obesity, cardiovascular diseases, and diabetes. Resveratrol (RSV), a natural polyphenol, has been shown the potential of ameliorating disregulations of lipid metabolism. The objective of this study was to investigate the effects of feed intake and RSV on lipid metabolism in zebrafish (Danio rerio). The adult males were randomly allocated to 6 groups: control (Con, 8 mg cysts/fish/day), control with 20 μmol/L RSV (Con+RSV), calorie restriction (CR, 5 mg cysts/fish/day), calorie restriction with RSV (CR+RSV), overfeed (OF, 60 mg cysts/fish/day), and overfeed with RSV (OF+RSV) groups...
2017: PloS One
https://www.readbyqxmd.com/read/28681917/concentration-dependent-metabolic-effects-of-metformin-in-healthy-and-fanconi-anemia-lymphoblast-cells
#16
Silvia Ravera, Vanessa Cossu, Barbara Tappino, Elena Nicchia, Carlo Dufour, Simona Cavani, Andrea Sciutto, Claudia Bolognesi, Marta Columbaro, Paolo Degan, Enrico Cappelli
Metformin (MET) is the drug of choice for patients with type 2 diabetes and has been proposed for use in cancer therapy and for treating other metabolic diseases. More than 14,000 studies have been published addressing the cellular mechanisms affected by MET. However, several in vitro studies have used concentrations of the drug 10-100-fold higher than the plasmatic concentration measured in patients. Here we evaluated the biochemical, metabolic and morphologic effects of various concentrations of MET. Moreover, we tested the effect of MET on Fanconi Anemia (FA) cells, a DNA repair genetic disease with defects in energetic and glucose metabolism, as well as on human promyelocytic leukemia (HL60) cell lines...
July 6, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28676953/regulation-of-sirt1-ampk-axis-is-critically-involved-in-gallotannin-induced-senescence-and-impaired-autophagy-leading-to-cell-death-in-hepatocellular-carcinoma-cells
#17
Hee Young Kwon, Ju-Ha Kim, Bonglee Kim, Sanjay K Srivastava, Sung-Hoon Kim
Hepatocellular carcinoma (HCC) is one of the most fatal malignancies with high mortality worldwide. Here the underlying antitumor mechanism of gallotannin was elucidated in HCC cells. Gallotannin suppressed viability and colony formation, increased subG1 portion and also induced senescence via upregulation of p21, G0/G1 arrest and higher SA-β-gal activity in HepG2 and SK-Hep1 cells. However, pan-caspase inhibitor Z-VAD-FMK reversed the ability of gallotannin to activate caspase 3 at 48 h after treatment in two HCC cells...
July 4, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28659610/upregulation-of-arylsulfatase-b-in-carotid-atherosclerosis-is-associated-with-symptoms-of-cerebral-embolization
#18
Erik Biros, Corey S Moran, Jane Maguire, Elizabeth Holliday, Christopher Levi, Jonathan Golledge
The aim of this study was to identify genes for which the expression within carotid atherosclerosis was reproducibly associated with the symptoms of cerebral embolization. Two publically available microarray datasets E-MEXP-2257 and GSE21545 were analysed using GeneSpring 11.5. The two datasets utilized a total of 22 and 126 carotid atherosclerosis samples, obtained from patients with and without symptoms of cerebral embolization, respectively. To assess whether the findings were reproducible we analysed carotid atherosclerosis samples from another 8 patients with and 7 patients without symptoms of cerebral embolization using real-time PCR...
June 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28641051/beneficial-role-of-citrus-fruit-polyphenols-against-hepatic-dysfunctions-a-review
#19
Md Mohabbulla Mohib, Kazi Afnan, Tasfiq Zaman Paran, Salma Khan, Juthika Sarker, Nahid Hasan, Istiaque Hasan, Md Abu Taher Sagor
Alcoholic liver diseases and virus-induced hepatic dysfunctions are prevalent in western countries. Evidence also suggests that hyperglycemia and insulin resistance are key players in the development of hepatic diseases and their complications. Since the comorbid diseases like obesity, diabetes and vascular dysfunctions primarily affect liver, the modern therapies against other hepatic dysfunctions are becoming a major challenge to treat. In addition to these, polypharmacy and adverse drug reactions (ADRs) are further aggravating the phenomenon...
June 22, 2017: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/28621732/lipid-accumulation-in-hepg2-cells-is-attenuated-by-strawberry-extract-through-ampk-activation
#20
Tamara Y Forbes-Hernández, Francesca Giampieri, Massimiliano Gasparrini, Sadia Afrin, Luca Mazzoni, Mario D Cordero, Bruno Mezzetti, José L Quiles, Maurizio Battino
Regulation of lipid metabolism is essential for treatment and prevention of several chronic diseases such as obesity, diabetes, and cardiovascular diseases, which are responsible for most deaths worldwide. It has been demonstrated that the AMP-activated protein kinase (AMPK) has a direct impact on lipid metabolism by modulating several downstream-signaling components. The main objective of the present work was to evaluate the in vitro effect of a methanolic strawberry extract on AMPK and its possible repercussion on lipid metabolism in human hepatocellular carcinoma cells (HepG2)...
June 16, 2017: Nutrients
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