Abstract
Fibroblast growth factor-1 (FGF-1) and FGF-2 are heparin-binding polype ptides which express potent mitogenic properties in neoplastic cells. In the present study, we have examined the contribution of endogenous FGF-1 and FGF-2 to the autocrine growth of HSY human salivary-gland adenocarcinoma cells in vitro. Using specific monoclonal antibodies against FGF-1 and FGF-2, immunohistochemical analysis of HSY cells revealed strong expression of both FGF-1 and FGF-2 in the cytoplasm and nucleus. Consistent with these data, 2 molecular mass species of FGF-1 (16 and 18 kDa) and 3 FGF-2 (18, 24 and 27 kDa) were identified in HSY cells by Western-blot analysis. Scatchard analysis of FGF binding sites on HSY cells indicated the presence of 23,000 [125I]FGF-1 binding sites/cells with a dissociation constant (KD) of 178 pM and 13,000 [125I]FGF-2 binding sites/cell with a KD of 102 pM. In addition, HSY cells were shown to express the mRNA for FGF receptor-1 (FGFR-1) by reverse transcription-polymerase chain reaction (RT-PCR), confirming the existence of high-affinity FGF binding sites. The influence of endogenous FGF-1 and FGF-2 on HSY cell growth was evaluated by suppressing the expression and activity of FGF by using anti-sense oligonucle...Continue Reading
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