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Gastrointestinal hormones cause rapid c-Met receptor down-regulation by a novel mechanism involving clathrin-mediated endocytosis and a lysosome-dependent mechanism.

Authors: Hoffmann, KM  Tapia, JA  Berna, MJ  Thill, M  Braunschweig, T  Mantey, SA  Moody, TW  Jensen, RT 
Citation: Hoffmann KM, etal., J Biol Chem. 2006 Dec 8;281(49):37705-19. Epub 2006 Oct 10.
Pubmed: (View Article at PubMed) PMID:17035232
DOI: Full-text: DOI:10.1074/jbc.M602583200

The activated c-Met receptor has potent effects on normal tissues and tumors. c-Met levels are regulated by hepatocyte growth factor (HGF); however, it is unknown if they can be regulated by gastrointestinal (GI) hormones. c-Met is found in many GI tissues/tumors that possess GI hormone receptors. We studied the effect of GI hormones on c-Met in rat pancreatic acini, which possess both receptors. CCK-8, carbachol, and bombesin, but not VIP/secretin, decreased c-Met. CCK-8 caused rapid and potent c-Met down-regulation and abolished HGF-induced c-Met and Gab1 tyrosine phosphorylation, while stimulating c-Met serine phosphorylation. The effect of cholecystokinin (CCK) was also seen in intact acini using immunofluorescence, in a biotinylated fraction representing membrane proteins, in single acinar cells, in Panc-1 tumor cells, and in vivo in rats injected with CCK. CCK-8 did not decrease cell viability or overall responsiveness. GF109203X, thapsigargin, or their combination partially reversed the effect of CCK-8. In contrast to HGF-induced c-Met down-regulation, the effect of CCK was decreased by a lysosome inhibitor (concanamycin) but not the proteasome inhibitor lactacystin. Inhibitors of clathrin-mediated endocytosis blocked the effect of CCK. HGF but not CCK-8 caused c-Met ubiquitination. These results show CCK and other GI hormones can cause rapid c-Met down-regulation, which occurs by a novel mechanism. These results could be important for c-Met regulation in normal as well as in neoplastic tissue in the GI tract.

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CRRD Object Information
CRRD ID: 2317514
Created: 2010-04-08
Species: All species
Last Modified: 2010-04-08
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.