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Comparison of the ability of basic and acidic fibroblast growth factor to stimulate the proliferation of an established keratinocyte cell line: Modulation of their biological effects by heparin, transforming growth factor β (TGFβ), and epidermal growth factor (EGF)
Author(s) -
Gospodarowicz D.,
Plouët J.,
Malerstein B.
Publication year - 1990
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041420215
Subject(s) - epidermal growth factor , cell growth , transforming growth factor , basic fibroblast growth factor , cell culture , growth factor , heparin binding egf like growth factor , fibroblast growth factor , microbiology and biotechnology , biology , tgf alpha , endocrinology , receptor , medicine , chemistry , biochemistry , genetics
Abstract The bioactivity of both bFGF and aFGF in the BALB/MK‐1 cell line has been compared to that of EGF. Our results indicate that, for that cell type, aFGF was far more potent than bFGF in inducing cell proliferation. In the presence of heparin, aFGF was as potent as EGF. In addition, excess bFGF has an inhibitory effect on the proliferation of MK cells exposed to a saturating concentration of aFGF, therefore acting as a partial agonist of aFGF. Surprisingly, bFGF, although it had low biological activity, was capable of synergizing the effect of EGF. In its presence, culturesexposed to saturating concentration of EGF have a final cell density 3‐to 4‐fold higher than that of counterpart cultures exposed to EGF alone. TGFβ, which in previous studies has been shown to inhibit the growth of keratinocytes, also inhibited the growth of BALB/MK‐1 cells in response to either bFGF or aFGF. These studies suggest a role for FGF in regulating BALB/MK proliferation. aFGF provides positive growth signals which can be negatively modulated by excess bFGF or TGFβ, while bFGF, although a poor mitogen, could act by potentiating the effect of subsaturating concentrations of EGF.