Pertussis toxin-sensitive G-proteins inhibit fibroblast growth factor-induced signaling in pancreatic acini.

Abstract:

:Signal transduction of fibroblast growth factor (FGF) receptors is known to involve tyrosine phosphorylation of several substrates, including Grb2, phospholipase C-gamma, and phosphatidylinositol 3-kinase, whereas the role of G-proteins in FGF receptor signaling is controversial. In the present study we investigated the role of G-proteins in FGF receptor signaling in rat pancreatic acini. Immunological analysis revealed the presence of FGF receptor and phospholipase C-gamma1 in rat pancreatic acini. Both basic fibroblast growth factor (FGF-2) and guanosine 5'-(gamma-O-thio)triphosphate (GTPgammaS) caused an increase in inositol 1,4,5-trisphosphate (1,4,5-IP3) production and amylase release. Combined stimulation of the acini with GTPgammaS and FGF-2 led to a decrease of these responses as compared to the effect of the single substances. When pancreatic acini were preincubated with FGF-2 (1 nM) or vehicle (water) ADP-ribosylation of the alpha-subunit of Gi-type G-proteins by pertussis toxin was reduced in membranes prepared from FGF-2 pretreated acini as compared to control acini, suggesting functional interaction of FGF receptors with Gi-proteins. Pretreatment of acini with pertussis toxin which inhibits Gi-type G-proteins abolished the inhibitory effect of GTPgammaS on FGF-induced 1,4,5-IP3 production and amylase release, whereas the stimulatory effects of FGF-2 and GTPgammaS on these parameters remained unchanged. In conclusion, these results show communication of FGF receptors and Gi-type G-proteins and that Gi-type G-proteins exert an inhibitory influence on FGF-induced activation of phosphoinositide-specific phospholipase C in pancreatic acinar cells.

journal_name

J Cell Physiol

authors

Piiper A,Stryjek-Kaminska D,Gebhardt R,Zeuzem S

doi

10.1002/(SICI)1097-4652(199604)167:1<52::AID-JCP6>

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

52-9

issue

1

eissn

0021-9541

issn

1097-4652

pii

10.1002/(SICI)1097-4652(199604)167:1<52::AID-JCP6>

journal_volume

167

pub_type

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