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The effects of growth factors on human normal placental cytotrophoblast cell proliferation
Authors:RH Li  LZ Zhuang
Affiliation:Institute of Zoology, Chinese Academy of Sciences, Beijing.
Abstract:The effects of growth factors were investigated on the proliferation of a normal placental cytotrophoblast cell line (NPC). Epidermal growth factor (EGF), transforming growth factor alpha (TGF alpha) and insulin-like growth factor-I (IGF-I) stimulated NPC cell proliferation. In contrast, TGFbeta1 was found to be a negative regulator, inhibiting EGF-induced cell proliferation. When EGF/TGF alpha receptor was analysed by radio-ligand binding, two binding sites of different affinities were revealed in the proliferating NPC cells but only the low affinity binding site was detected in the non-proliferating cytotrophoblast cells in primary cultures. The results suggest that EGF stimulates cytotrophoblast proliferation through high affinity binding sites.
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