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• W2080470349 abstract "Cardiomyocyte cell death is a major contributing factor for diabetic cardiomyopathy, and multiple mechanisms have been proposed for its development. We hypothesized that following diabetes, an increased nuclear presence of the Forkhead transcription factor, FoxO1, could turn on cardiac cell death through mediation of nitrosative stress. Streptozotocin (100 mg/kg) was used to induce irreversible hyperglycemia in Wistar rats, and heart tissues and blood samples extracted starting from 1 to 4 days. Diazoxide (100 mg/kg), which produced acute reversible hyperglycemia, were followed for up to 12 h. In both animal models of hyperglycemia, attenuation of survival signals was accompanied by increased nuclear FoxO1. This was accompanied by a simultaneous increase in iNOS expression and iNOS induced protein nitrosylation of GAPDH, increased GAPDH binding to Siah1 and facilitated nuclear translocation of the complex. Even though caspase-3 was cleaved during diabetes, its nitrosylation modification affected its ability to inactivate PARP. As a result, there was PARP activation followed by nuclear compartmentalization of AIF, and increased phosphatidyl serine externalization. Our data suggests a role for FoxO1 mediated iNOS induced S-nitrosylation of target proteins like GAPDH and caspase-3 in initiating cardiac cell death following hyperglycemia, and could explain the impact of glycemic control in preventing cardiovascular disease in patients with diabetes." @default.
• W2080470349 created "2016-06-24" @default.
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• W2080470349 date "2012-11-01" @default.
• W2080470349 modified "2023-10-16" @default.
• W2080470349 title "Diabetes triggers a PARP1 mediated death pathway in the heart through participation of FoxO1" @default.
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• W2080470349 doi "https://doi.org/10.1016/j.yjmcc.2012.08.013" @default.
• W2080470349 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22940604" @default.
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