We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Amplification of insulin secretion by lipid messengers.
- Authors
Turk, John; Gross, Richard W.; Ramanadham, Sasanka; Turk, J; Gross, R W; Ramanadham, S
- Abstract
D-glucose induces a rise in pancreatic islet beta-cell cytosolic [Ca2+] by processes requiring both glucose metabolism and Ca2+ entry from the extracellular space, and this Ca2+ signal is thought to be critical to the induction of insulin secretion. Insulin secretagogues also induce phospholipid hydrolysis and accumulation of phospholipid-derived mediators in islets, including the lipid messengers DAG, nonesterified arachidonic acid, and arachidonate 12-LO products. This study offers the following viewpoints on potential roles of these lipid messengers in insulin secretion as working hypotheses: 1) the Ca2+ signal provided to the beta-cell by D-glucose induces insulin secretion only in the context of amplifying background signals provided by the beta-cell content of messengers including DAG; 2) muscarinic receptor agonists amplify glucose-induced insulin secretion in part by altering the beta-cell content of DAG; 3) the Ca2+ signal provided by metabolism of D-glucose is amplified by the level of nonesterified arachidonic acid in beta-cell membranes, which acts to facilitate Ca2+ entry; 4) metabolism of glucose induces accumulation of nonesterified arachidonate in beta-cells via activation of a recently identified ASCI-PLA2 enzyme, which may be a component of the beta-cell fuel sensor apparatus; and 5) arachidonate 12-LO metabolites are potential candidates as adjunctive modulators of beta-cell K(+)-channel activity.
- Publication
Diabetes, 1993, Vol 42, Issue 3, p367
- ISSN
0012-1797
- Publication type
journal article
- DOI
10.2337/diab.42.3.367