CCK expression in enteroendocrine cell is regulated by soluble factor(s) from underlying fibroblasts.
Studies on the cross-talk between the intestinal epithelium and the underlying connective tissue have concentrated on enterocytes. In contrast, little is known about the interactions between the mesenchymal compartment and the enteroendocrine cells, scattered among the other cell types of the epithelium. To address this question, a panel of coculture systems between the enteroendocrine STC-1 cell line and three intestinal myofibroblastic cell lines (MIC) was used in order to assess different levels of regulation, namely cell-cell and cell-matrix interactions, and the role of diffusible factors. We demonstrate that the expression of cholecystokinin, a typical intestinal hormone produced by STC-1 cells, is up-regulated in the presence of a fibroblastic environment through a paracrine pathway involving FGF2. Concomitantly, STC-1 cell morphology and proliferation were also modulated, but through distinct mechanisms according to the origin of fibroblasts. The results reveal definite epithelio-mesenchymal interactions that may be critical for the maintenance of phenotype and function of enteroendocrine cells.
Ratineau
C
C
INSERM U45, Hôpital Edouard Herriot, Pavillon Hbis, 69437, Lyon Cedex 03, France.
Dreau
S
S
Blanc
M
M
Bernard
C
C
Cordier-Bussat
M
M
Abello
J
J
Chayvialle
J
J
Roche
C
C
D000818:Animals; D002450:Cell Communication; D002455:Cell Division; D002766:Cholecystokinin / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism*; D018920:Coculture Techniques; D017077:Culture Media, Conditioned / Q000494:pharmacology; D019858:Enteroendocrine Cells / Q000187:drug effects / Q000378:metabolism*; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology; D005347:Fibroblasts / Q000378:metabolism*; D015870:Gene Expression / Q000187:drug effects; D017228:Hepatocyte Growth Factor / Q000494:pharmacology; D051379:Mice; D019899:Paracrine Communication; D012333:RNA, Messenger / Q000187:drug effects; D016212:Transforming Growth Factor beta / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D015854:Up-Regulation
D017077:Culture Media, Conditioned; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D016222:Fibroblast Growth Factor 2; D017228:Hepatocyte Growth Factor; D002766:Cholecystokinin