Cellular specificity for the activation of fibroblast growth factor-2 by heparan sulfate proteoglycan.

Abstract:

:Heparan sulfate proteoglycans (HSPGs) promote cellular proliferation through interaction with FGF-2. To examine the role of cellular specificity of HSPG in FGF-2 function, a recombinant soluble isoform of CD44 (rsCD44v3,8-10) was expressed in various cell types; 293 T fibroblasts, the epithelial carcinoma cell lines A431 and HOTZ, the myelomonocytic cell line THP-1, and the Ig-secreting B lymphoblast IM9. The capacity of the recombinant HSPGs expressed in these cell lines to bind and present FGF-2 to the high-affinity receptor FGFR1 was addressed. This novel approach showed a minor difference in the binding and in the FGF-2 stimulating activity of rsCD44v3,8-10 HSPGs from fibroblasts and epithelial cells. However, FGF-2 binding of rsCD44v3,8-10 from IM9 and THP-1 cells was significantly lower, and stimulation of FGF-2 by rsCD44v3,8-10 from these two cell types could not be detected. We tested the possibility that the differences among cell types were related to the functional profile of endogenous HSPGs. The initial survey of a wider panel of cell types revealed high levels of HSPGs synthesis on the surface of 293 T, epithelial and IM9 cells, but low levels on the surface of other cells of hematopoietic origin. Surprisingly, native HSPGs from fibroblasts and epithelial cell lines promoted FGF-2 biological activity to vastly different extents, and cell surface HSPGs from IM9 cells induced an FGF-2 response. Altogether, the results suggested a role for cell-specific HS modification in addition to synthesis as regulatory mechanisms for the cellular specificity of proteoglycan function.

authors

Fiore MM

doi

10.1006/bbrc.2001.4978

subject

Has Abstract

pub_date

2001-06-08 00:00:00

pages

384-8

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(01)94978-2

journal_volume

284

pub_type

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