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Differential regulation by fatty acids of protein histidine phosphorylation in rat pancreatic islets

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Abstract

Long-chain fatty acids (e.g. arachidonic acid) have been implicated in physiological control of insulin secretion. We previously reported histidine phosphorylation of at least two islet proteins (e.g., NDP kinase and the β subunit of trimeric G-proteins), and suggested that such a signalling step may have regulatory roles in β cell signal transduction, specifically at the level of G-protein activation. Since our earlier findings also indicated potential regulation by long-chain fatty acids of islet G-proteins, we undertook the current study to verify putative regulation, by fatty acids, of protein histidine phosphorylation of NDP kinase and Gβ subunit in normal rat islets. The phosphoenzyme formation of NDP kinase was stimulated by various fatty acids in the following rank order: linoleic acid < arachidonic acid < oleic acid < palmitic acid = stearic acid = control. Furthermore, the catalytic activity of NDP kinase was stimulated by these fatty acids in the rank order of: oleic acid < arachidonic acid < linoleic acid < palmitic acid = stearic acid = control. Arachidonic acid methyl ester, an inactive analog of arachidonic acid, did not significantly affect either the phosphoenzyme formation or the catalytic activity of NDP kinase. Interestingly, arachidonic acid exerted dual effects on the histidine phosphorylation of β subunit; it significantly stimulated the phosphorylation at 33 μM beyond which it was inhibitory. Together, these findings identify additional loci (e.g., NDP kinase and Gβ subunit) at which unsaturated, but not saturated, fatty acids could exert their intracellular effects leading to exocytotic secretion of insulin (Mol Cell Biochem 266: 175–182, 2004)

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  1. Department of Pharmaceutical Sciences, Wayne State University and Cell Biochemistry Laboratory, John D Dingell VA Medical Center, Detroit, MI, USA.

    Anjaneyulu Kowluru

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Kowluru, A. Differential regulation by fatty acids of protein histidine phosphorylation in rat pancreatic islets. Mol Cell Biochem 266, 175–182 (2004). https://doi.org/10.1023/B:MCBI.0000049157.03855.74

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