Abstract:
:We have investigated the effect of IGF-II on glucose-induced insulin release in the pancreatic beta-cell. Introduction of IGF-II during perifusion of the cells with 20 mM glucose abolished glucose-induced insulin release. Concomitant addition of IGF-II with 20 mM glucose caused a complete inhibition of insulin release. In addition, IGF-II inhibited Ca(2+)-induced insulin release from electropermeabilized pancreatic beta-cells. IGF-II had no effect on K(+)-or tolbutamide-induced insulin release. However, IGF-II could suppress K(+)-stimulated insulin release when cells were pretreated with the protein phosphatase inhibitor okadaic acid. The inhibitory effect of IGF-II on insulin release was not associated with significant changes in membrane potential, activity of the voltage-gated L-type Ca(2+)-channel or cytoplasmic free Ca2+ concentration. Pretreatment of the cells with pertussis toxin or the phorbol ester TPA abolished the inhibitory action of IGF-II on insulin release. Hence, the molecular mechanism whereby activation of the IGF-II/M6P receptor by IGF-II inhibits glucose-stimulated insulin exocytosis in the pancreatic beta-cell involves pertussis toxin-sensitive G proteins and is dependent on PKC activity.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Zhang Q,Berggren PO,Larsson O,Hall K,Tally Mdoi
10.1006/bbrc.1997.8053subject
Has Abstractpub_date
1998-02-04 00:00:00pages
117-21issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(97)98053-0journal_volume
243pub_type
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