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Type: Artigo
Title: Effects of hyperglycemia and aging on nuclear sirtuins and DNA damage of mouse hepatocytes
Author: Ghiraldini, Flávia Gerelli
Crispim, Ana Carolina Vitolo
Mello, Maria Luiza Silveira
Abstract: Hyperglycemia, like aging, induces chromatin remodeling in mouse hepatocytes in comparison to normoglycemia and younger age, respectively. Changes in glucose metabolism also affect the action and expression of sirtuins, promoting changes in chromatin conformation and dynamics. Here we investigate the abundance and activity of the nuclear sirtuins Sirt1, Sirt6, and Sirt7 in mouse hepatocytes in association with specific histone acetylation, DNA damage, and the activation of nucleolar organizing regions (NORs) in hyperglycemic nonobese diabetic (NOD) and old normoglycemic BALB/c mouse strains. Higher levels of Sirt1 and PGC-1 alpha and increased expression of gluconeogenesis pathway genes are found in the hyperglycemic NOD mice. Increased Sirt6 abundance is found in the hyperglycemic NOD mice, which might increase DNA damage repair. With aging, lower Sirt1 abundance and activity, increased acetylated histone modifications and Sirt7 levels, and NOR methylation are found. Thus, whereas in normal aging cell metabolism is reduced, in the diabetic mice a compensatory mechanism may elevate Sirt1 and Sirt6 levels, increasing gluconeogenesis and DNA repair from the oxidative damage caused by hyperglycemia. Therefore understanding the regulation of epigenetic factors in diabetes and aging is crucial for the development of new therapeutic approaches that could prevent diseases and improve quality of life.
Subject: Hiperglicemia
Dano ao DNA
Country: Estados Unidos
Editor: American Society for Cell Biology
Citation: Molecular Biology Of The Cell. Amer Soc Cell Biology, v. 24, n. 15, n. 2467, n. 2476, 2013.
Rights: aberto
Identifier DOI: 10.1091/mbc.E13-04-0186
Date Issue: 2013
Appears in Collections:IB - Artigos e Outros Documentos

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