SIRT3 deficiency and mitochondrial protein hyperacetylation accelerate the development of the metabolic syndrome.
SIRT3 deficiency and mitochondrial protein hyperacetylation accelerate the development of the metabolic syndrome.
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DOI:
10.1016/j.molcel.2011.07.019
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发表时间:
2011-10-21
期刊:
影响因子:
16
通讯作者:
Verdin E
中科院分区:
文献类型:
--
作者:
Hirschey MD;Shimazu T;Jing E;Grueter CA;Collins AM;Aouizerat B;Stančáková A;Goetzman E;Lam MM;Schwer B;Stevens RD;Muehlbauer MJ;Kakar S;Bass NM;Kuusisto J;Laakso M;Alt FW;Newgard CB;Farese RV Jr;Kahn CR;Verdin E
Acetylation is increasingly recognized as an important metabolic regulatory post-translational protein modification, yet the metabolic consequence of mitochondrial protein hyperacetylation is unknown. We find that high-fat diet (HFD) feeding induces hepatic mitochondrial protein hyperacetylation in mice and downregulation of the major mitochondrial protein deacetylase SIRT3. Mice lacking SIRT3 (SIRT3KO) placed on a HFD show accelerated obesity, insulin resistance, hyperlipidemia, and steatohepatitis compared to wild-type (wt) mice. The lipogenic enzyme stearoyl-CoA desaturase 1 is highly induced in SIRT3KO mice, and its deletion rescues both wt and SIRT3KO mice from HFD-induced hepatic steatosis and insulin resistance. We further identify a single nucleotide polymorphism in the human SIRT3 gene that is suggestive of a genetic association with the metabolic syndrome. This polymorphism encodes a point-mutation in the SIRT3 protein, which reduces its overall enzymatic efficiency. Our findings show loss of SIRT3 and dysregulation of mitochondrial protein acetylation contribute to the metabolic syndrome.
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