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- W2014772241 abstract "Available information on the fate and insulinotropic action of L-alanine in isolated pancreatic islets is restricted to data collected in obese hyperglycemic mice. Recent data, however, collected mostly in tumoral islet cells of either the RINm5F line or BRIN-BD11 line, have drawn attention to the possible role of Na(+) co-transport in the insulinotropic action of L-alanine. In the present study conducted in islets prepared from normal adult rats, L-alanine was found (i) to inhibit pyruvate kinase in islet homogenates, (ii) not to affect the oxidation of endogenous fatty acids in islets prelabelled with [U-14C]palmitate, (iii) to stimulate 45Ca uptake in islets deprived of any other exogenous nutrient, and (iv) to augment insulin release evoked by either 2-ketoisocaproate or L-leucine, whilst failing to significantly affect glucose-induced insulin secretion. The oxidation of L-[U-14C]alanine was unaffected by D-glucose, but inhibited by L-leucine. Inversely, L-alanine decreased the oxidation of D-[U-14C]glucose, but failed to affect L-[U-14C]leucine oxidation. It is concluded that the occurrence of a positive insulinotropic action of L-alanine is restricted to selected experimental conditions, the secretory data being compatible with the view that stimulation of insulin secretion by the tested nutrient(s) reflects, as a rule, their capacity to augment ATP generation in the islet B cells. However, the possible role of Na(+) co-transport in the secretory response to L-alanine cannot be ignored." @default.
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- W2014772241 date "2002-10-10" @default.
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- W2014772241 title "The stimulus–secretion coupling of amino acid-induced insulin release. Insulinotropic action of ?-alanine" @default.
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- W2014772241 doi "https://doi.org/10.1016/s0304-4165(02)00337-9" @default.
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