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Complex role of protein kinase C in mediating the supramaximal inhibition of pancreatic secretion observed with cholecystokinin.

Abstract：

:Protein kinase C appears to play an important, yet complex role in the supramaximal inhibition of pancreatic acinar cell secretion observed in response to cholecystokinin (CCK). The addition of protein kinase C activation to the concentration-response curve of a partial agonist acting at the CCK receptor (a phenethyl ester analogue of CCK), transforms a curve without supramaximal inhibition to a full agonist curve typical of CCK. This effect can be elicited by low concentrations of phorbol ester (50pM to 1nM 12-0-tetradecanoyl-phorbol-13-acetate) or by hormonal agonists (0.1 microM carbamylcholine, 10pM bombesin, 1pM CCK-8) which activate protein kinase C, but not by agonists acting via alternate second messengers (VIP). Of interest, this effect is dependent on preincubation of the acinar cells with the protein kinase C activator at 37 degrees C, with the effect rapidly reversed by transient exposure of the cells to lower temperature. This is consistent with mediation by a phosphorylation event. However, the requirement for an extended (greater than 15 min) preincubation period when using minimal kinase activation suggests that this phenomenon is more complicated than a simple bimolecular phosphorylation event and likely includes a series of events such as translocation of substrates and/or enzymes involved.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Gaisano HY,Miller LJ

doi

10.1016/s0006-291x(05)81522-0

subject

Has Abstract

pub_date

1992-08-31 00:00:00

pages

498-506

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)81522-0

journal_volume

187

pub_type

杂志文章

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