alexa Abstract | IL-1beta-Induced iNOS Expression, NO Release and Loss in Metabolic Cell Viability Are Resistant to Inhibitors of Ceramide Synthase and Sphingomyelinase in INS 832/13 Cells

JOP. Journal of the Pancreas
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Abstract

Context Emerging evidence indicates regulatory roles for ceramide in the metabolic dysfunction of the islet beta cell. Recently, potential similarities between IL-1beta and ceramide on their effects on islet beta cell have been reported, including reduction in mitochondrial membrane potential and loss in metabolic cell viability.Objective Herein, we investigated whether IL-1beta-induced nitric oxide synthetase (iNOS) expression, nitric oxide (NO) release and loss in metabolic cell viability require ceramide biosynthesis either via the activation of sphingomyelinase or ceramide synthase.Setting Insulin-secreting INS 832/13 cells.Results We found that two structurally-distinct inhibitors of sphingomyelinase activation (e.g., 3-O-methylsphingomyelin or desipramine) or ceramide biosynthesis inhib-itor (e.g., fumonisin) failed to exert clear effects on IL-1beta-induced iNOS expression, NO release and loss in cell viability.Conclusions Taken together, our findings indicate that neither the sphingomyelinase nor the ceramide synthase activation is required for IL-1beta-induced metabolic abnormalities in insulin-secreting INS 832/13 cells.

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Author(s): Rajakrishnan Veluthakal Giridhar Rao Jangati Anjaneyulu Kowluru

 
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