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sirtuin-1

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https://www.readbyqxmd.com/read/28214861/sirt1-regulates-the-inflammatory-response-of-vascular-adventitial-fibroblasts-through-autophagy-and-related-signaling-pathway
#1
Wei-Rong Wang, Ting-Ting Li, Ting Jing, Yan-Xiang Li, Xiao-Feng Yang, Yan-Hao He, Wei Zhang, Rong Lin, Ji-Ye Zhang
BACKGROUND/AIMS: Autophagy is a lysosomal degradation pathway that is essential for cellular survival, differentiation, and homeostasis. Sirtuin 1 (SIRT1), a NAD+-dependent deacetylase, plays a pivotal role in modulation of autophagy. Recent studies found that autophagy was involved in the regulation of inflammatory response. In this study, we aimed to determine the effect of SIRT1 on autophagy and inflammation, and whether autophagy can regulate the inflammatory response in vascular adventitial fibroblasts (VAFs)...
February 3, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28213273/2-methoxyestradiol-protects-against-ischemia-reperfusion-injury-in-alcoholic-fatty-liver-by-enhancing-sirtuin-1-mediated-autophagy
#2
Hong-Ik Cho, Min-Jong Seo, Sun-Mee Lee
Alcoholic fatty liver (AFL) is susceptible to ischemia/reperfusion (I/R) injury, responding with inflammation and extensive hepatocellular damage. Autophagy maintains cellular homeostasis and regulates inflammation and lipid metabolism. 2-Methoxyestradiol (2-ME2), an endogenous metabolite of estradiol, exhibits antioxidant and anti-inflammatory properties. This study examined the cytoprotective mechanisms of 2-ME2 on hepatic I/R in AFL, focusing on autophagy signaling. C57BL/6 mice were fed an ethanol diet (ED) to induce AFL, or a control diet (CD) for 6 weeks, and then subjected to 60 min of ischemia and 5 h of reperfusion...
February 14, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28212343/oxyresveratrol-supplementation-to-c57bl-6-mice-fed-with-a-high-fat-diet-ameliorates-obesity-associated-symptoms
#3
Hui Yuan Tan, Iris Mei Ying Tse, Edmund Tsze Shing Li, Mingfu Wang
Oxyresveratrol has been proven effective in inhibiting adipogenesis in a 3T3-L1 cell model. We investigated the preventive effect of oxyresveratrol supplementation on obesity development in high-fat diet-fed mice. Male C57bl/6 mice were randomly subjected to control (5% fat by weight, LF), high-fat (30% fat by weight, HF), and high-fat supplemented with 0.25% and 0.5% oxyresveratrol (OXY1 and OXY2, respectively) diet groups for eight weeks. Oxyresveratrol supplementation effectively alleviated obesity-associated symptoms such as insulin resistance, hyperglycemia, and hepatic steatosis in high-fat diet-fed mice...
February 16, 2017: Nutrients
https://www.readbyqxmd.com/read/28211759/gamma-tocopherol-supplementation-ameliorated-hyper-inflammatory-response-during-the-early-cutaneous-wound-healing-in-alloxan-induced-diabetic-mice
#4
Jihyun Shin, Soo Jin Yang, Yunsook Lim
Delayed wound healing is one of the major diabetic complications. During wound healing process, the early inflammatory stage is important for better prognosis. One of antioxidant nutrient, gamma-tocopherol (GT) is considered to regulate inflammatory conditions. This study investigated the effect of GT supplementation on mechanism associated with inflammation, oxidative stress, and apoptosis during early cutaneous wound healing in diabetic mice. Diabetes was induced by alloxan injection in ICR mice. All mice were divided into three groups: non-diabetic control mice (CON), diabetic control mice (DMC), and diabetic mice supplemented with GT (GT)...
March 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28197625/different-effect-of-resveratrol-to-induction-of-apoptosis-depending-on-the-type-of-human-cancer-cells
#5
Michinori Takashina, Sayaka Inoue, Kei Tomihara, Kengo Tomita, Kohshi Hattori, Qing-Li Zhao, Tokiko Suzuki, Makoto Noguchi, Wakana Ohashi, Yuichi Hattori
The effect of resveratrol on various human cancer cells was investigated with special focus on apoptotic cell death, in an attempt to further characterize its mechanism of action. There were great differences in the anti-viability effect of resveratrol between different types of human cancer cells. While the inhibition of cell viability by resveratrol was marked in U937 and MOLT-4 leukemia cells, resveratrol moderately inhibited cell viability in MCF-7 breast, HepG2 liver, and A549 lung cancer cells, and the effect was slight on cell viability in Caco-2, HCT116, and SW480 colon cancer cells...
January 24, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28196907/acetylation-dependent-regulation-of-mdm2-e3-ligase-activity-dictates-its-oncogenic-function
#6
Naoe T Nihira, Kohei Ogura, Kouhei Shimizu, Brian J North, Jinfang Zhang, Daming Gao, Hiroyuki Inuzuka, Wenyi Wei
Abnormal activation of the oncogenic E3 ubiquitin ligase murine double minute 2 (MDM2) is frequently observed in human cancers. By ubiquitinating the tumor suppressor p53 protein, which leads to its proteasome-mediated destruction, MDM2 limits the tumor-suppressing activity of p53. On the other hand, by ubiquitinating itself, MDM2 targets itself for destruction and promotes the p53 tumor suppressor pathway, a process that can be antagonized by the deubiquitinase herpesvirus-associated ubiquitin-specific protease (HAUSP)...
February 14, 2017: Science Signaling
https://www.readbyqxmd.com/read/28193316/polydatin-improves-the-developmental-competence-of-bovine-embryos-in-vitro-via-induction-of-sirtuin-1-sirt1
#7
Imran Khan, Sung Woo Kim, Kyung-Lim Lee, Seok-Hwan Song, Ayman Mesalam, M M R Chowdhury, Zia Uddin, Ki Hun Park, Il-Keun Kong
The aim of the present study was to investigate the beneficial effect of polydatin (PD), the glycoside form of resveratrol, on embryo development in vitro. Oocytes were aspirated from ovaries of Korean Hanwoo cows and cultured until Day 8 in a humidified atmosphere of 5% CO2 in air at 38.5°C. Protein and gene expression levels were determined through confocal microscopy and reverse transcription-polymerase chain reaction respectively, whereas the number of total and apoptotic cells in Day 8 blastocysts was determined using Hoechst 33342 staining and terminal deoxyribonucleotidyl transferase-mediated dUTP-digoxigenin nick end-labelling...
February 14, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28191886/sirtuin-1-regulates-cardiac-electrical-activity-by-deacetylating-the-cardiac-sodium-channel
#8
Ajit Vikram, Christopher M Lewarchik, Jin-Young Yoon, Asma Naqvi, Santosh Kumar, Gina M Morgan, Julia S Jacobs, Qiuxia Li, Young-Rae Kim, Modar Kassan, Jing Liu, Mohanad Gabani, Ajay Kumar, Haider Mehdi, Xiaodong Zhu, Xiaoqun Guan, William Kutschke, Xiaoming Zhang, Ryan L Boudreau, Shengchuan Dai, Daniel S Matasic, Saet-Byel Jung, Kenneth B Margulies, Vikas Kumar, Markus M Bachschmid, Barry London, Kaikobad Irani
The voltage-gated cardiac Na(+) channel (Nav1.5), encoded by the SCN5A gene, conducts the inward depolarizing cardiac Na(+) current (INa) and is vital for normal cardiac electrical activity. Inherited loss-of-function mutations in SCN5A lead to defects in the generation and conduction of the cardiac electrical impulse and are associated with various arrhythmia phenotypes. Here we show that sirtuin 1 deacetylase (Sirt1) deacetylates Nav1.5 at lysine 1479 (K1479) and stimulates INa via lysine-deacetylation-mediated trafficking of Nav1...
February 13, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28191278/impact-of-yoga-and-meditation-on-cellular-aging-in-apparently-healthy-individuals-a-prospective-open-label-single-arm-exploratory-study
#9
Madhuri Tolahunase, Rajesh Sagar, Rima Dada
This study was designed to explore the impact of Yoga and Meditation based lifestyle intervention (YMLI) on cellular aging in apparently healthy individuals. During this 12-week prospective, open-label, single arm exploratory study, 96 apparently healthy individuals were enrolled to receive YMLI. The primary endpoints were assessment of the change in levels of cardinal biomarkers of cellular aging in blood from baseline to week 12, which included DNA damage marker 8-hydroxy-2'-deoxyguanosine (8-OH2dG), oxidative stress markers reactive oxygen species (ROS), and total antioxidant capacity (TAC), and telomere attrition markers telomere length and telomerase activity...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28168178/aging-related-correlation-between-serum-sirtuin-1-activities-and-basal-metabolic-rate-in-women-but-not-in-men
#10
Hee Jae Lee, Soo Jin Yang
Sirtuin (SIRT) is a main regulator of metabolism and lifespan, and its importance has been implicated in the prevention against aging-related diseases. The purpose of this study was to identify the pattern of serum SIRT1 activity according to age and sex, and to investigate how serum SIRT1 activity is correlated with other metabolic parameters in Korean adults. The Biobank of Jeju National University Hospital, a member of the Korea Biobank Network, provided serum samples from 250 healthy adults. Aging- and metabolism-related factors were analyzed in serum, and the data were compared by the stratification of age and sex...
January 2017: Clinical Nutrition Research
https://www.readbyqxmd.com/read/28153032/analyses-of-caspase-1-regulated-transcriptomes-in-various-tissues-lead-to-identification-of-novel-il-1%C3%AE-il-18-and-sirtuin-1-independent-pathways
#11
Ya-Feng Li, Gayani Nanayakkara, Yu Sun, Xinyuan Li, Luqiao Wang, Ramon Cueto, Ying Shao, Hangfei Fu, Candice Johnson, Jiali Cheng, Xiongwen Chen, Wenhui Hu, Jun Yu, Eric T Choi, Hong Wang, Xiao-Feng Yang
BACKGROUND: It is well established that caspase-1 exerts its biological activities through its downstream targets such as IL-1β, IL-18, and Sirt-1. The microarray datasets derived from various caspase-1 knockout tissues indicated that caspase-1 can significantly impact the transcriptome. However, it is not known whether all the effects exerted by caspase-1 on transcriptome are mediated only by its well-known substrates. Therefore, we hypothesized that the effects of caspase-1 on transcriptome may be partially independent from IL-1β, IL-18, and Sirt-1...
February 2, 2017: Journal of Hematology & Oncology
https://www.readbyqxmd.com/read/28139552/inhibition-of-hydrogen-peroxide-induced-human-umbilical-vein-endothelial-cells-aging-by-allicin-depends-on-sirtuin1-activation
#12
Xiao-Long Lin, Yuanbo Liu, Mihua Liu, HuiJun Hu, Yongquan Pan, Xiao-Juan Fan, Xue-Mei Hu, Wei-Wen Zou
BACKGROUND The abnormal activity of Sirtuin 1 (Sirt1) is closely related to the aging of vascular endothelial cells. As a bioactive molecule, allicin has antioxidant, anti-inflammatory, and lipid-regulating mechanisms. However, few reports about the relationship of allicin and Sirt1 have been published. In this study, we aimed to elucidate the effect of allicin on Human Umbilical Vein Endothelial Cells (HUVECs) aging induced by hydrogen peroxide (H2O2) and the role of Sirt1 in this phenomenon. MATERIAL AND METHODS HUVEC were exposed to H2O2 to establish the aging model...
January 31, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28138562/amphetamines-promote-mitochondrial-dysfunction-and-dna-damage-in-pulmonary-hypertension
#13
Pin-I Chen, Aiqin Cao, Kazuya Miyagawa, Nancy F Tojais, Jan K Hennigs, Caiyun G Li, Nathaly M Sweeney, Audrey S Inglis, Lingli Wang, Dan Li, Matthew Ye, Brian J Feldman, Marlene Rabinovitch
Amphetamine (AMPH) or methamphetamine (METH) abuse can cause oxidative damage and is a risk factor for diseases including pulmonary arterial hypertension (PAH). Pulmonary artery endothelial cells (PAECs) from AMPH-associated-PAH patients show DNA damage as judged by γH2AX foci and DNA comet tails. We therefore hypothesized that AMPH induces DNA damage and vascular pathology by interfering with normal adaptation to an environmental perturbation causing oxidative stress. Consistent with this, we found that AMPH alone does not cause DNA damage in normoxic PAECs, but greatly amplifies DNA damage in hypoxic PAECs...
January 26, 2017: JCI Insight
https://www.readbyqxmd.com/read/28133883/carbon-monoxide-ameliorates-hepatic-ischemia-reperfusion-injury-via-sirtuin1-mediated-deacetylation-of-hmgb1-in-rats
#14
Jian Sun, Enshuang Guo, Jiankun Yang, Yan Yang, Shenpei Liu, Jifa Hu, Xiaojing Jiang, Olaf Dirsch, Uta Dahmen, Wei Dong, Anding Liu
: Carbon monoxide (CO) exerts protective effects on hepatic ischemia/reperfusion (I/R) injury, but the underlying molecular mechanisms are not fully understood. High mobility group box 1 (HMGB1) is an important mediator of injury and inflammation in hepatic I/R injury. Here, we investigated whether CO could attenuate hepatic I/R injury via inhibition of HMGB1 release, particularly through sirtuin 1 (SIRT1). CO was released by treatment with CO-releasing molecule (CORM)-2. CORM-2-delivered CO ameliorated hepatic I/R injury, as indicated by lower serum aminotransferase levels, lower hepatic inflammatory responses and less severe I/R-associated histopathologic changes...
January 30, 2017: Liver Transplantation
https://www.readbyqxmd.com/read/28130161/protective-effect-of-resveratrol-against-inflammation-oxidative-stress-and-apoptosis-in-pancreas-of-aged-samp8-mice
#15
Cristina Ginés, Sara Cuesta, Roman Kireev, Cruz García, Lisa Rancan, Sergio D Paredes, Elena Vara, Jesús A F Tresguerres
Aging is a physiological state in which a progressive decline in organ functions is accompanied by the development of age-related diseases. Resveratrol supplementation has been shown to exert anti-inflammatory and antioxidant effects in various mammalian models of aging. Senescence-accelerated mice (SAM) are commonly used as animal models to investigate the aging process. In the present study, the effects of inflammation, oxidative stress and apoptosis in pancreas of two different types of SAM (SAMR1 or resistant to aging, and SAMP8 or prone to aging) have been analysed, as well as the effect of resveratrol administration (5mg/kg/day) on these parameters in the SAMP8 strain...
January 24, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28127381/expression-of-cellular-protective-proteins-sirt1-hsp70-and-sod2-correlates-with-age-and-is-significantly-higher-in-nk-cells-of-the-oldest-seniors
#16
Lucyna Kaszubowska, Jerzy Foerster, Jan Jacek Kaczor, Daria Schetz, Tomasz Jerzy Ślebioda, Zbigniew Kmieć
BACKGROUND: NK cells are key effector lymphocytes of innate immunity provided with constitutive cytolytic activity, however, their role in human ageing is not entirely understood. The study aimed to analyze the expression of proteins involved in cellular stress response sirtuin 1 (SIRT1), heat shock protein 70 (HSP70) and manganese superoxide dismutase (SOD2) in non-stimulated NK cells of the oldest seniors (n = 25; aged over 85; mean age 88 years) and compare with NK cells of the old (n = 30; aged under 85; mean age 76 years) and the young (n = 32; mean age 21 years) to find potential relationships between the level of expression of these proteins in NK cells and longevity...
2017: Immunity & Ageing: I & A
https://www.readbyqxmd.com/read/28126510/caveolin1-protein-arginine-methyltransferase1-sirtuin1-axis-as-a-potential-target-against-endothelial-dysfunction
#17
REVIEW
Soniya Charles, Vijay Raj, Jesu Arokiaraj, Kanchana Mala
Endothelial dysfunction (ED), an established response to cardiovascular risk factors, is characterized by increased levels of soluble molecules secreted by endothelial cells (EC). Evidence suggest that ED is an independent predictor of cardiac events and that it is associated with a deficiency in production or bioavailability of nitric oxide (NO) and/or an imbalance in the relative contribution of endothelium-derived relaxing and contracting factors. ED can be reversed by treating cardiovascular risk factors, hence, beyond ambiguity, ED contributes to initiation and progression of atherosclerotic disease...
January 23, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28122359/tumor-associated-nadh-oxidase-tnox-nad-sirtuin-1-axis-contributes-to-oxaliplatin-induced-apoptosis-of-gastric-cancer-cells
#18
Huei-Yu Chen, Hsiao-Ling Cheng, Yi-Hui Lee, Tien-Ming Yuan, Shi-Wen Chen, You-Yu Lin, Pin Ju Chueh
Oxaliplatin belongs to the platinum-based drug family and has shown promise in cancer treatment. The major mechanism of action of platinum compounds is to form platinum-DNA adducts, leading to DNA damage and apoptosis. Accumulating evidence suggests that they might also target non-DNA molecules for their apoptotic activity. We explored the effects of oxaliplatin on a tumor-associated NADH oxidase (tNOX) in gastric cancer lines. In AGS cells, we found that the oxaliplatin-inhibited tNOX effectively attenuated the NAD+/NADH ratio and reduced the deacetylase activity of an NAD+-dependent sirtuin 1, thereby enhancing p53 acetylation and apoptosis...
January 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28122311/sirt1-inhibits-releases-of-hmgb1-and-hsp70-from-human-umbilical-vein-endothelial-cells-caused-by-il-6-and-the-serum-from-a-preeclampsia-patient-and-protects-the-cells-from-death
#19
Yongxiang Yin, Yaling Feng, Hua Zhao, Ziyu Zhao, Hua Yua, Jianjuan Xu, Haisha Che
Preeclampsia (PE), a pregnancy-specific disorder, is associated with inappropriate maternal inflammatory response, oxidative stress, and vascular endothelial cell dysfunction and damage. Releases of high mobility group box-1 (HMGB1) and heat-shock protein 70 (HSP70) into serum are considered to participate in the pathogenesis of PE. The deacetylase, sirtuin 1 (SIRT1), has protective effects against inflammation, apoptosis, and oxidative stress in various pathological conditions. We established a PE mouse model by injection of phosphatidylserine/dioleoyl-phosphatidycholine compounds, followed by measurement of the SIRT1 protein level in the placenta via Western blotting and the serum HMGB1 and HSP70 concentrations via enzyme-linked immunosorbent assay (ELISA)...
January 22, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28118644/the-gender-association-of-the-sirt1-rs7895833-polymorphism-with-pediatric-obesity-a-3-year-panel-study
#20
Myoungsook Lee, Serim Choi, Yunkyoung Lee, Hyun-Hee Oh
OBJECTIVES: Sirtuin 1 (SIRT1), a longevity-associated gene, has pleiotropic functions. We investigated whether SIRT1 variation is associated with pediatric obesity. METHODS: During 3 years of follow-up of 219 children (101 boys, 118 girls) aged 8 or 9 years at baseline, obesity parameters such as anthropometrics, plasma lipid and insulin resistance profiles, and nutrient intakes were analyzed with regard to 3 genotypes of SIRT1 rs7895833 (GG, GA, and AA). RESULTS: The prevalence of obesity including overweight had increased from 18...
January 25, 2017: Journal of Nutrigenetics and Nutrigenomics
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