Cholecystokinin stimulates a specific ribosomal S6 kinase in rat pancreatic acini.

Abstract:

:Stimulation of intact rat pancreatic acini with cholecystokinin (CCK) enhances the phosphorylation of the ribosomal protein S6 in a dose-dependent manner with half maximal stimulation at 40 pM and maximal stimulation at 1 nM CCK octapeptide. Soluble cellular extracts contained S6 kinase activity assayed using purified rat pancreatic ribosomes as substrate. Stimulation by CCK of S6 kinase was concentration dependent, being half maximal at 50 pM and maximal at 1 nM CCK. The phorbol ester 12-O-tetradecanoyl-phorbol 13-acetate (TPA), an activator of protein kinase C, also increased both S6 phosphorylation in intact acini and soluble S6 kinase activity. In order to determine whether S6 kinase mediated S6 phosphorylation following CCK treatment of acini, two-dimensional phosphopeptide analysis was performed for S6 proteins phosphorylated under various conditions. These data suggest that a specific soluble S6 kinase, the activation of which appears to be directly or indirectly mediated by protein kinase C, is the functional enzyme in intact acini that mediates the action of CCK to increase S6 phosphorylation and may be involved in increased protein synthesis in pancreatic acini treated with CCK.

journal_name

Pancreas

journal_title

Pancreas

authors

Sung CK,Williams JA

doi

10.1097/00006676-199011000-00006

subject

Has Abstract

pub_date

1990-11-01 00:00:00

pages

668-76

issue

6

eissn

0885-3177

issn

1536-4828

journal_volume

5

pub_type

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