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. 1994 Jan;14(1):181–188. doi: 10.1128/mcb.14.1.181

Fibroblast growth factor receptors have different signaling and mitogenic potentials.

J K Wang 1, G Gao 1, M Goldfarb 1
PMCID: PMC358368  PMID: 8264585

Abstract

Fibroblast growth factor (FGF) receptors (FGFRs) are structurally related receptor protein tyrosine kinases encoded by four distinct genes. Activation of FGFR-1, -2, and -3 by FGFs induces mitogenic responses in various cell types, but the mitogenic potential of FGFR-4 has not been previously explored. We have compared the properties of BaF3 murine lymphoid cells and L6 rat myoblast cells engineered to express FGFR-1 or FGFR-4. Acidic FGF binds with high affinity to and elicits tyrosine phosphorylation of FGFR-1 or FGFR-4 receptors displayed on BaF3 cells, but only FGFR-1 activation leads to cell survival and growth. FGFR-4 activation also fails to elicit detectable signals characteristic of the FGFR-1 response: tyrosine phosphorylation of SHC and extracellular signal-related kinase (ERK) proteins and induction of fos and tis11 RNA expression. The only detected response to FGFR-4 activation was weak phosphorylation of phospholipase C gamma. A chimeric receptor containing the extracellular domain of FGFR-4 and the intracellular domain of FGFR-1 confers FGF-dependent growth upon transfected BaF3 cells, demonstrating that the intracellular domains of the receptors dictate their functional capacity. Activation of FGFR-1 in transfected L6 myoblasts induced far stronger phosphorylation of phospholipase C gamma, SHC, and ERK proteins than could activation of FGFR-4 in L6 cells, and only FGFR-1 activation induced tyrosine phosphorylation of a characteristic 80-kD protein. Hence, the signaling and biological responses elicited by different FGF receptors substantially differ.

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Selected References

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