Downregulation of adipose glutathione S-transferase A4 leads to increased protein carbonylation, oxidative stress, and mitochondrial dysfunction
Jessica M Curtis, Paul A Grimsrud, Wendy S Wright, Xin Xu, Rocio E Foncea, David W Graham, Jonathan R Brestoff, Brian M Wiczer, Olga Ilkayeva, Katherine Cianflone, Deborah E Muoio, Edgar A Arriaga, David A Bernlohr, Jessica M Curtis, Paul A Grimsrud, Wendy S Wright, Xin Xu, Rocio E Foncea, David W Graham, Jonathan R Brestoff, Brian M Wiczer, Olga Ilkayeva, Katherine Cianflone, Deborah E Muoio, Edgar A Arriaga, David A Bernlohr
Abstract
Objective: Peripheral insulin resistance is linked to an increase in reactive oxygen species (ROS), leading in part to the production of reactive lipid aldehydes that modify the side chains of protein amino acids in a reaction termed protein carbonylation. The primary enzymatic method for lipid aldehyde detoxification is via glutathione S-transferase A4 (GSTA4) dependent glutathionylation. The objective of this study was to evaluate the expression of GSTA4 and the role(s) of protein carbonylation in adipocyte function.
Research design and methods: GSTA4-silenced 3T3-L1 adipocytes and GSTA4-null mice were evaluated for metabolic processes, mitochondrial function, and reactive oxygen species production. GSTA4 expression in human obesity was evaluated using microarray analysis.
Results: GSTA4 expression is selectively downregulated in adipose tissue of obese insulin-resistant C57BL/6J mice and in human obesity-linked insulin resistance. Tumor necrosis factor-alpha treatment of 3T3-L1 adipocytes decreased GSTA4 expression, and silencing GSTA4 mRNA in cultured adipocytes resulted in increased protein carbonylation, increased mitochondrial ROS, dysfunctional state 3 respiration, and altered glucose transport and lipolysis. Mitochondrial function in adipocytes of lean or obese GSTA4-null mice was significantly compromised compared with wild-type controls and was accompanied by an increase in superoxide anion.
Conclusions: These results indicate that downregulation of GSTA4 in adipose tissue leads to increased protein carbonylation, ROS production, and mitochondrial dysfunction and may contribute to the development of insulin resistance and type 2 diabetes.
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References
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