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J. Biol. Chem., Vol. 275, Issue 21, 16091-16097, May 26, 2000
From the Fibroblast growth factors (FGFs) transmit their
signals through four transmembrane receptors that are designated
FGFR1-4. Alternative splicing in the extracellular region of FGFR1-3
generates receptor variants with different ligand binding affinities.
Thus two types of transmembrane receptors (IIIb and IIIc isoforms) have
been identified for FGFR2 and FGFR3, and the existence of analogous
variants has been postulated for FGFR1 based on its genomic structure.
However, only a single full-length transmembrane FGFR1 variant
(FGFR1-IIIc) has been identified so far. Here we describe the cloning
of a full-length cDNA encoding FGFR1-IIIb from a mouse skin wound
cDNA library. This receptor isoform was expressed at the highest
levels in a subset of sebaceous glands of the skin and in neurons of
the hippocampus and the cerebellum. FGFR1-IIIb was expressed in L6 rat
skeletal muscle myoblasts and used in cross-linking and receptor
binding studies. FGF-1 was found to bind the receptor with high
affinity, whereas FGF-2, -10, and -7 bound with significantly lower
affinities. Despite their apparently similar but low affinities, FGF-10
but not FGF-7 induced the activation of p44/42 mitogen-activated
protein kinase in FGFR1-IIIb-expressing L6 myoblasts and stimulated
mitogenesis in these cells, demonstrating that this new receptor
variant is a functional transmembrane receptor for FGF-10.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AF176552.
Fibroblast Growth Factor (FGF) Receptor 1-IIIb Is a Naturally
Occurring Functional Receptor for FGFs That Is Preferentially Expressed
in the Skin and the Brain*
,
,
,
**
Institute of Cell Biology, Swiss Federal
Institute of Technology, CH-8093 Zürich, Switzerland, the
§ Department of Developmental Neurobiology, New Hunt's
House, King's College London, London SE1 9RT, United Kingdom, the
¶ Imperial Cancer Research Fund, London WC2A 3PX, United Kingdom,
and
Human Genome Sciences, Inc., Rockville, Maryland 20850
*
This work was supported by the Human Frontier Science
Program (to S. W., C. D., and I. M.) and the
Bundesministerium für Bildung und Forschung (to S. W.).The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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