Cytokine regulation of fibroblast growth factor receptor 3 IIIb in intestinal epithelial cells.
Proliferation and function of the intestinal epithelium is modulated by a range of regulatory peptides, including cytokines and peptide growth factors. To define mechanisms integrating these regulatory systems, the effects of growth factors and cytokines on the expression of the fibroblast growth factor (FGF) receptor 3 (FGFR3) IIIb expressed on intestinal epithelial cells were examined in Caco-2 cells. Regulated expression of FGFR3 IIIb was associated with acquisition of the differentiated state. Keratinocyte growth factor (KGF), a ligand of another member of the FGF receptor family, enhanced expression of FGFR3 IIIb, but acidic FGF, the ligand for FGFR3 IIIb itself, had no effect. Epidermal growth factor and transforming growth factor-beta also markedly enhanced FGFR3 IIIb expression in a different temporal pattern. In addition, FGFR3 IIIb expression was increased 10-fold by the cytokine interleukin-2. These studies demonstrate integration between cytokines and growth factor ligand-receptor systems in intestinal epithelial cells.
Kanai
M
M
Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston 02114, USA.
Rosenberg
I
I
Podolsky
D K
DK
D015152:Blotting, Northern; D015153:Blotting, Western; D018938:Caco-2 Cells; D002454:Cell Differentiation; D016207:Cytokines / Q000494:pharmacology / Q000502:physiology*; D004815:Epidermal Growth Factor / Q000494:pharmacology; D016220:Fibroblast Growth Factor 1 / Q000494:pharmacology; D051526:Fibroblast Growth Factor 10; D051523:Fibroblast Growth Factor 7; D005346:Fibroblast Growth Factors; D006133:Growth Substances / Q000494:pharmacology; D006801:Humans; D007413:Intestinal Mucosa / Q000166:cytology / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D017468:Receptors, Fibroblast Growth Factor / Q000235:genetics / Q000378:metabolism*; D016212:Transforming Growth Factor beta / Q000494:pharmacology
D016207:Cytokines; C496453:FGF7 protein, human; D051526:Fibroblast Growth Factor 10; D006133:Growth Substances; D012333:RNA, Messenger; D017468:Receptors, Fibroblast Growth Factor; D016212:Transforming Growth Factor beta; D016220:Fibroblast Growth Factor 1; D051523:Fibroblast Growth Factor 7; D005346:Fibroblast Growth Factors; D004815:Epidermal Growth Factor