Decreased complex II respiration and HNE-modified SDH subunit in diabetic heart

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• 作者：Ossama M. Lashin ; Pamela A. Szweda ; Luke I. Szweda and Andrea M.P. Romani
• 关键词：Type I diabetes ; Streptozotocin ; Mitochondria ; Succinate dehydrogenase ; HNE ; Free radicals
• 刊名：Free Radical Biology and Medicine
• 出版年：2006
• 出版时间：1 March 2006
• 年：2006
• 卷：40
• 期：5
• 页码：886-896
• 全文大小：394 K

文摘

Several lines of research suggest that mitochondria play a role in the etiopathogenesis of diabetic cardiomyopathy, although the mechanisms involved are still debated. In the present study, we report that State 3 oxygen consumption decreases by 35 % with glutamate and by 30 % with succinate in mitochondria from diabetic rat hearts compared to controls. In these mitochondria the enzymatic activities of complex I and complex II are also decreased to a comparable extent. Western blot analysis of mitochondrial protein pattern using antibodies recognizing proteins modified by the lipid peroxidation product 4-hydroxynonenal indicates the FAD-containing subunit of succinate dehydrogenase as one of the targets of this highly reactive aldehyde. In rats diabetic for 6 or 12 weeks, insulin supplementation for 2 weeks decreases the level of protein modified by 4-hydroxynonenal and restores mitochondrial respiration and enzyme activity to control level. Taken together, these results: (1) indicate that 4-hydroxynonenal is endogenously produced within diabetic mitochondria and forms an adduct with selective mitochondrial proteins, (2) identify one of these proteins as a subunit of succinate dehydrogenase, and (3) provide strong evidence that insulin treatment can reverse and ameliorate free radical damage and mitochondrial function under diabetic conditions.