Glucose regulates pancreatic preprosomatostatin I expression.

ABSTRACT

Rainbow trout were used as a model system to evaluate the role of glucose in regulating the expression of preprosomatostatin I. Glucose increased pancreatic levels of preprosomatostatin I mRNA in vivo, in concert with elevated plasma somatostatin levels, and in vitro. Glucose-stimulated expression of preprosomatostatin I mRNA required the uptake, phosphorylation, and subsequent metabolism of the sugar in pancreatic islets. These results suggest that glucose modulates both the production and release of somatostatin.