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https://www.readbyqxmd.com/read/29728458/the-epigenetic-regulator-sirt7-guards-against-mammalian-cellular-senescence-induced-by-ribosomal-dna-instability
#1
Silvana Paredes, Maria Angulo-Ibanez, Luisa Tasselli, Scott M Carlson, Wei Zheng, Tie-Mei Li, Katrin F Chua
In the yeast Saccharomyces cerevisiae, genomic instability in rDNA repeat sequences is an underlying cause of cell aging and is suppressed by the chromatin-silencing factor Sir2. In humans, rDNA instability is observed in cancers and premature aging syndromes, but its underlying mechanisms and functional consequences remain unclear. Here, we uncovered a pivotal role of sirtuin 7 (SIRT7), a mammalian Sir2 homolog, in guarding against rDNA instability and show that this function of SIRT7 protects against senescence in primary human cells...
May 4, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29710664/microrna-340-inhibits-the-growth-and-invasion-of-angiosarcoma-cells-by-targeting-sirt7
#2
Xiaoxin Wang, Ying Song
MicroRNAs (miRNAs) are emerging as critical regulators for the development and progression of various cancers, including angiosarcoma. Accumulating evidence suggests that miRNA-340 (miR-340) is an important cancer-associated miRNA. However, little is known about the role of miR-340 in angiosarcoma. In this study, we aimed to investigate the potential biological functions of miR-340 and its potential target gene in angiosarcoma. Our results showed that miR-340 expression was significantly decreased in angiosarcoma compared with normal controls...
April 25, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29651144/sirtuin-7-deficiency-ameliorates-cisplatin-induced-acute-kidney-injury-through-regulation-of-the-inflammatory-response
#3
Yoshikazu Miyasato, Tatsuya Yoshizawa, Yoshifumi Sato, Terumasa Nakagawa, Yuko Miyasato, Yutaka Kakizoe, Takashige Kuwabara, Masataka Adachi, Alessandro Ianni, Thomas Braun, Yoshihiro Komohara, Masashi Mukoyama, Kazuya Yamagata
Cisplatin-induced acute kidney injury (AKI) has been recognized as one of cisplatin's serious side effects, limiting its use in cancer therapy. Sirtuin 1 (SIRT1) and SIRT3 play protective roles against cisplatin-induced kidney injury. However, the role of SIRT7 in cisplatin-induced kidney injury is not yet known. In this study, we found that Sirt7 knockout (KO) mice were resistant to cisplatin-induced AKI. Furthermore, our studies identified that loss of SIRT7 decreases the expression of tumor necrosis factor-α (TNF-α) by regulating the nuclear expression of the transcription factor nuclear factor kappa B...
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29570999/impairment-of-an-endothelial-nad-h-2-s-signaling-network-is-a-reversible-cause-of-vascular-aging
#4
Abhirup Das, George X Huang, Michael S Bonkowski, Alban Longchamp, Catherine Li, Michael B Schultz, Lynn-Jee Kim, Brenna Osborne, Sanket Joshi, Yuancheng Lu, Jose Humberto Treviño-Villarreal, Myung-Jin Kang, Tzong-Tyng Hung, Brendan Lee, Eric O Williams, Masaki Igarashi, James R Mitchell, Lindsay E Wu, Nigel Turner, Zolt Arany, Leonard Guarente, David A Sinclair
A decline in capillary density and blood flow with age is a major cause of mortality and morbidity. Understanding why this occurs is key to future gains in human health. NAD precursors reverse aspects of aging, in part, by activating sirtuin deacylases (SIRT1-SIRT7) that mediate the benefits of exercise and dietary restriction (DR). We show that SIRT1 in endothelial cells is a key mediator of pro-angiogenic signals secreted from myocytes. Treatment of mice with the NAD+ booster nicotinamide mononucleotide (NMN) improves blood flow and increases endurance in elderly mice by promoting SIRT1-dependent increases in capillary density, an effect augmented by exercise or increasing the levels of hydrogen sulfide (H2 S), a DR mimetic and regulator of endothelial NAD+ levels...
March 22, 2018: Cell
https://www.readbyqxmd.com/read/29564694/differential-gene-expression-of-sirtuins-between-somatotropinomas-and-nonfunctioning-pituitary-adenomas
#5
Isabella P P Grande, Paulo V G H Amorim, Ane Caroline Thé B Freire, Raquel S Jallad, Nina R Musolino, Valter A Cescato, Gilberto O da Silva, Marcello D Bronstein, Ericka B Trarbach
Sirtuins 1-7 (SIRT) are a highly conserved family of histone deacetylases involved in the regulation of longevity that have a considerable impact in transcription, DNA repair regulation, telomeric stability, cell senescence and apoptosis. In the present study, SIRT1-7 mRNA levels were evaluated in 37 somatotropinomas and 31 nonfunctioning pituitary adenomas (NFPAs) using qPCR and relation to tumor size, invasiveness and Ki-67 proliferative index was made. Overexpression of SIRT1 was observed in 86.5% of somatotropinomas versus 41...
March 21, 2018: Pituitary
https://www.readbyqxmd.com/read/29557214/current-understanding-and-future-perspectives-of-the-roles-of-sirtuins-in-the-reprogramming-and-differentiation-of-pluripotent-stem-cells
#6
Yi-Chao Hsu, Yu-Ting Wu, Chia-Ling Tsai, Yau-Huei Wei
In mammalian cells, there are seven members of the sirtuin protein family (SIRT1-7). SIRT1, SIRT6, and SIRT7 catalyze posttranslational modification of proteins in the nucleus, SIRT3, SIRT4, and SIRT5 are in the mitochondria and SIRT2 is in the cytosol. SIRT1 can deacetylate the transcription factor SOX2 and regulate induced pluripotent stem cells (iPSCs) reprogramming through the miR-34a-SIRT1-p53 axis. SIRT2 can regulate the function of pluripotent stem cells through GSK3β. SIRT3 can positively regulate PPAR gamma coactivator 1-alpha (PGC-1α) expression during the differentiation of stem cells...
March 2018: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29467843/sirtuin-7-promotes-colorectal-carcinoma-proliferation-and-invasion-through-the-inhibition-of-e-cadherin
#7
Zhigang Deng, Xingbiao Wang, Xuan Long, Wanzhong Liu, Chunhua Xiang, Feng Bao, Dong Wang
Sirtuin 7 (Sirt7) is a member of the sirtuin protein family and is implicated in various carcinomas; however, the function of Sirt7 in colorectal carcinoma (CRC) remains unclear. The present study aimed to explore the biological function of Sirt7 in CRC tissues and cell lines, and to investigate the potential underlying mechanism by performing reverse transcription-quantitative polymerase chain reaction analyses, western blot analyses, luciferase reporter assays, cell proliferation and invasion assays. It was demonstrated that Sirt7 presented a higher expression in CRC tissues and cell lines compared with that in normal tissues and cells, and this higher expression was correlated with the tumor size, the tumor, node and metastasis stage and distant metastasis...
March 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29438839/sirtuin7-has-an-oncogenic-potential-via-promoting-the-growth-of-cholangiocarcinoma-cells
#8
Wenzhi Li, Zhe Sun, Chen Chen, Lin Wang, Zhimin Geng, Jie Tao
Accumulating evidence indicates that sirtuin7 (SIRT7) plays an oncogenic role in the main types of liver cancer, hepatocellular carcinoma (HCC). Nevertheless, the clinical significance of SIRT7 and its role in cholangiocarcinoma (CCA) is largely undiscovered. Here, we found that SIRT7 displayed higher expression in CCA tissues compared to intrahepatic normal bile duct and surrounding liver tissues based on The Cancer Genome Atlas (TCGA) data. Our data further confirmed that SIRT7 was overexpressed in CCA patient tissues and cell lines...
April 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29428666/microrna-519d-inhibits-proliferation-and-induces-apoptosis-of-human-hypertrophic-scar-fibroblasts-through-targeting-sirtuin-7
#9
Xiaoqian Zhou, Yidun Xie, Houan Xiao, Xudong Deng, Yu Wang, Liyuan Jiang, Chen Liu, Rui Zhou
MicroRNAs (miRNAs) play critical roles in various pathological processes, including hypertrophic scar (HS) formation. However, the precise role of miRNAs in HS formation remains largely unknown. In this study, we aimed to investigate the role of miR-519d in HS formation. We found that miR-519d expression was significantly downregulated in HS tissues and fibroblasts. Overexpression of miR-519d inhibited the expression of type I collagen (Col I), type III collagen (Col III) and α-smooth muscle actin (α-SMA) in HS fibroblasts...
April 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29422688/lc-ms-ms-based-quantitative-study-of-the-acyl-group-and-site-selectivity-of-human-sirtuins-to-acylated-nucleosomes
#10
Kana Tanabe, Jiaan Liu, Daiki Kato, Hitoshi Kurumizaka, Kenzo Yamatsugu, Motomu Kanai, Shigehiro A Kawashima
Chromatin structure and gene expression are dynamically regulated by posttranslational modifications of histones. Recent advance in mass spectrometry has identified novel types of lysine acylations, such as butyrylation and malonylation, whose functions and regulations are likely different from those of acetylation. Sirtuins, nicotinamide adenine dinucleotide (NAD+ )-dependent histone deacetylases, catalyze various deacylations. However, it is poorly understood how distinct sirtuins regulate the histone acylation states of nucleosomes that have many lysine residues...
February 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29413176/mammalian-sirtuins-sirt4-and-sirt7
#11
Shengchao Li, Weiping Zheng
Sirtuins are a family of intracellular enzymes whose enzymatic activities include catalyzing the β-nicotinamide adenine dinucleotide (β-NAD+ )-dependent Nɛ -acyl-lysine deacylation and the β-NAD+ -dependent mono-ADP-ribosylation. Among the seven sirtuin family members (i.e., SIRT1-7) thus far identified in mammals including humans, we know SIRT1/2/3/5/6 better than SIRT4/7 as for their enzymatic activities and the cellular roles of the reactions they catalyze. This chapter will provide an updated account on the enzymology and biology of SIRT4 and SIRT7, the two less well-understood mammalian sirtuins...
2018: Progress in Molecular Biology and Translational Science
https://www.readbyqxmd.com/read/29402405/sirt7-is-an-important-regulator-of-cartilage-homeostasis-and-osteoarthritis-development
#12
Wataru Korogi, Tatsuya Yoshizawa, Md Fazlul Karim, Hironori Tanoue, Masaki Yugami, Shihab U Sobuz, Eiichi Hinoi, Yoshifumi Sato, Yuichi Oike, Hiroshi Mizuta, Kazuya Yamagata
Sirtuins (SIRT1-7) are NAD+ -dependent deacetylase/deacylases that regulate a wide variety of biological functions. Although the roles of sirtuins in cartilage homeostasis and cartilage diseases have been well studied, there is no information on the contribution of SIRT7 to cartilage homeostasis and osteoarthritis (OA) pathologies. Here, we demonstrate that Sirt7 knockout mice are resistant to the development of aging-associated OA and forced exercise-induced OA. Attenuation of Sirt7 in the murine chondrogenic cell line ATDC5 increased the deposition of a glycosaminoglycan-rich extracellular matrix and the mRNA expression of extracellular matrix components such as Col2a1 and Acan...
February 2, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29305011/transcriptional-regulation-of-metabolism-by-sirt1-and-sirt7
#13
Kazuya Yamagata, Tatsuya Yoshizawa
Sirtuins are a family of evolutionally conserved nicotinamide adenine dinucleotide (NAD+ )-dependent protein deacetylases/deacylases that regulate metabolism. The mammalian sirtuin family consists of seven sirtuins (SIRT1-7). Recent findings have identified critical roles for SIRT1 and SIRT7 in glucose/lipid metabolism in multiple tissues. This review focuses on the metabolic roles of these two sirtuins and the benefits of modulating the activity of sirtuins for the treatment of metabolic diseases such as type 2 diabetes...
2018: International Review of Cell and Molecular Biology
https://www.readbyqxmd.com/read/29300832/analysis-of-polymorphisms-in-58-potential-candidate-genes-for-association-with-human-longevity
#14
Timothy A Donlon, Brian J Morris, Randi Chen, Kamal H Masaki, Richard C Allsopp, D Craig Willcox, Maarit Tiirikainen, Bradley J Willcox
Longevity is a polygenic trait in which genetic predisposition is particularly important. We hypothesized that amongst genes differentially expressed in response to caloric restriction, several may be candidate longevity genes. We tested 459 single nucleotide polymorphisms (SNPs) in 46 genes differentially expressed in calorically-restricted mice and 12 other genes for association with longevity. Subjects were American men of Japanese ancestry, 440 aged ≥95 years and 374 with an average lifespan. Based on a dominant model of inheritance, an association with longevity at the p < 0...
December 30, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29231244/sirt7-depletion-inhibits-cell-proliferation-migration-and-increases-drug-sensitivity-by-activating-p38mapk-in-breast-cancer-cells
#15
Kun-Lin Chen, Lian Li, Fang-Xiao Yang, Cheng-Min Li, Yi-Ru Wang, Gen-Lin Wang
SIRT7 is a member of the sirtuin family of proteins that are known to be associated with tumor development. However, the functional roles and molecular mechanisms underlying the function of SIRT7 in breast cancer cell survival and tumor development remain unclear. Recent studies demonstrated that SIRT7 is upregulated in breast cancer cells and tissues. In the present study, we systematically explored the roles of SIRT7 in the growth of breast cancer cells and tumors both in vitro and in vivo. Our results showed that SIRT7 plays a major role in facilitating cell survival by promoting cell proliferation and inhibiting apoptosis...
December 12, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29152116/microrna-526b-servers-as-a-prognostic-factor-and-exhibits-tumor-suppressive-property-by-targeting-sirtuin-7-in-hepatocellular-carcinoma
#16
Xin Liu, Liu Yang, Jianfeng Tu, Wenwei Cai, Meiqi Zhang, Zhangxuan Shou, Yingmin Yao, Qiuran Xu
Recent studies have reported that microRNA-526b (miR-526b) is implicated in the growth and metastasis of cancer cells. However, the clinical significance of miR-526b and its role as well as underlying mechanisms are largely unknown in hepatocellular carcinoma (HCC). Here, we detected miR-526b expression difference between HCC and matched nontumor tissues with qRT-PCR. We found that miR-526b displayed lower expression in HCC patient tissues and cells. Clinical analysis revealed that low miR-526b expression correlated with large tumor size, venous infiltration, advanced tumor-node-metastasis (TNM) stage...
October 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/29132743/nuclear-sirtuins-and-inflammatory-signaling-pathways
#17
REVIEW
Keila Lopes Mendes, Deborah de Farias Lelis, Sérgio Henrique Sousa Santos
The regulation of chronic inflammation has received considerable research attention in recent years because of its contribution to the pathogenesis of chronic diseases such as arthritis, diabetes, metabolic syndrome and obesity. Thus, strategies that inhibit the inflammatory state may be beneficial in improving the pathophysiology of several inflammation-related disorders. Sirtuins are a family of histone deacetylases that contain seven enzymatic activities in mammals (SIRT1-SIRT7) and function to suppress gene transcription by epigenetic mechanisms...
December 2017: Cytokine & Growth Factor Reviews
https://www.readbyqxmd.com/read/29123410/long-noncoding-rna-and-mrna-profiling-in-mda-mb-231-cells-following-rnai-mediated-knockdown-of-sirt7
#18
Kun-Lin Chen, Lian Li, Yi-Ru Wang, Cheng-Min Li, Tarig Mohammed Badri, Gen-Lin Wang
Breast cancer is one of the most common malignant cancers among women and a major clinical obstacle. Although studies have reported the abnormal expression of SIRT7 in breast cancer, whether the function of SIRT7 regulates the expression of long noncoding RNAs (lncRNAs) in breast cancer remains unknown. We aimed to determine the differential expressions of mRNAs and lncRNAs associated with SIRT7 and understand the regulatory mechanism of SIRT7 in breast cancer. RNA sequencing was performed to explore the transcriptome in MDA-MB-231 cells after SIRT7 depletion, and a total of 50,634 different transcripts were identified...
2017: OncoTargets and Therapy
https://www.readbyqxmd.com/read/29101029/sirtuin-7-is-involved-in-the-consolidation-of-fear-memory-in-mice
#19
Md Safiqul Islam, Fan-Yan Wei, Kunimasa Ohta, Naoki Shigematsu, Takaichi Fukuda, Kazuhito Tomizawa, Tatsuya Yoshizawa, Kazuya Yamagata
Sirtuin 7 (SIRT7) is an NAD+ -dependent deacetylase/deacylase, and is involved in a variety of biological processes relevant to the transcription of rRNA, the DNA damage response, tumorigenesis, and metabolism. SIRT7 mRNA is expressed ubiquitously, including in the brain, but there is no detailed information about the anatomical distribution and functional role of SIRT7 in the brain. Here, we demonstrated that SIRT7 is widely expressed in the mouse brain, including in the cortex, striatum, thalamus, hippocampus, and amygdala...
January 1, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29100388/sirtuin-7-a-new-marker-of-aggressiveness-in-prostate-cancer
#20
Romain Haider, Fabienne Massa, Lisa Kaminski, Stephan Clavel, Zied Djabari, Guillaume Robert, Kathiane Laurent, Jean-François Michiels, Matthieu Durand, Jean-Ehrland Ricci, Jean-François Tanti, Frédéric Bost, Damien Ambrosetti
Predictive biomarkers for advanced prostate cancer (PCa) are still missing. The sirtuin 7 (SIRT7) has been linked to tumorogenesis but its role in prostate cancer is poorly documented. To determine if SIRT7 can be a biomarker for aggressive prostate cancer and plays a role in PCa aggressiveness. We analyzed the expression of SIRT7 by immunohistochemistry in 57 patients comparing healthy with adjacent cancer tissue. SIRT7 levels were significantly elevated in tumors and its expression was positively associated with the grade...
September 29, 2017: Oncotarget
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