Title : Internalization of basic fibroblast growth factor (bFGF) in cultured endothelial cells: role of the low affinity heparin-like bFGF receptors.

Pub. Date : 1993 Jan

PMID : 8419401






7 Functional Relationships(s)
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1 This hypothesis was supported by the following experimental evidence: 1) soluble heparin inhibited the prolonged internalization of 125I-bFGF and its binding to low affinity sites with the same potency; 2) treatment of GM 7373 cells with heparinase, which removes most of the low affinity sites, also inhibited the prolonged internalization of 125I-bFGF. Heparin fibroblast growth factor 2 Bos taurus
2 This hypothesis was supported by the following experimental evidence: 1) soluble heparin inhibited the prolonged internalization of 125I-bFGF and its binding to low affinity sites with the same potency; 2) treatment of GM 7373 cells with heparinase, which removes most of the low affinity sites, also inhibited the prolonged internalization of 125I-bFGF. Heparin fibroblast growth factor 2 Bos taurus
3 This was the case also when 125I-bFGF was internalized in the presence of soluble heparin, suggesting that the complexes bFGF-cell surface glycosaminoglycan and bFGF-soluble heparin are maintained during the internalization of the growth factor. Heparin fibroblast growth factor 2 Bos taurus
4 This was the case also when 125I-bFGF was internalized in the presence of soluble heparin, suggesting that the complexes bFGF-cell surface glycosaminoglycan and bFGF-soluble heparin are maintained during the internalization of the growth factor. Heparin fibroblast growth factor 2 Bos taurus
5 This was the case also when 125I-bFGF was internalized in the presence of soluble heparin, suggesting that the complexes bFGF-cell surface glycosaminoglycan and bFGF-soluble heparin are maintained during the internalization of the growth factor. Heparin fibroblast growth factor 2 Bos taurus
6 Moreover, the capacity of soluble heparin to inhibit the mitogenic activity of bFGF also when added to cell cultures several hours after the growth factor indicates that the requirement for a prolonged interaction of bFGF with GM 7373 cells in order to induce cell proliferation might be related to the late internalization of the growth factor via low affinity sites. Heparin fibroblast growth factor 2 Bos taurus
7 Moreover, the capacity of soluble heparin to inhibit the mitogenic activity of bFGF also when added to cell cultures several hours after the growth factor indicates that the requirement for a prolonged interaction of bFGF with GM 7373 cells in order to induce cell proliferation might be related to the late internalization of the growth factor via low affinity sites. Heparin fibroblast growth factor 2 Bos taurus