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Gastroenterology. 1999 Jan;116(1):64-77.

Protein kinases C-gamma and -delta are involved in insulin-like growth factor I-induced migration of colonic epithelial cells.

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1
ESA CNRS 6032, Laboratoire de Biochimie Cellulaire, Universités d'Aix-Marseille I et II, Faculté de Pharmacie, Marseille, France.

Abstract

BACKGROUND & AIMS:

The mechanisms by which epithelial cells migrate during the repair of damaged colonic mucosa are poorly understood. This study investigated the insulin-like growth factor I (IGF-I) signaling pathway leading to HT29-D4 human colonic epithelial cell line migration.

METHODS:

IGF-stimulated cell migration was determined using a wound model in the presence or absence of kinase inhibitors. Activation of protein kinase C (PKC) was determined by immunodetection.

RESULTS:

IGF-I and insulin induce cell migration without affecting cell proliferation through their cognate receptors. Des(1-3)-IGF-I, a truncated analogue of IGF-I, was more potent than IGF-I, suggesting that IGF-binding proteins secreted in the medium modulated IGF-I-induced cell migration. Inhibition of phosphatidylinositol 3-kinase, PKC, and mitogen-activated protein kinases eliminated cell restitution. Long-term exposure of cells to phorbol myristate acetate caused the depletion of PKC-delta and -gamma and prevented also IGF-I-induced cell motility. IGF-I also induced activation of PKC-delta and -gamma only.

CONCLUSIONS:

IGF-I stimulates colonic restitution through the activation of multiple signaling pathways including activation of phosphatidylinositol 3-kinase, PKC-delta and -gamma, and mitogen-activated protein kinases.

PMID:
9869604
[Indexed for MEDLINE]
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