Abstract
SH-SY5Y neuroblastoma cells undergo neuronal differentiation and their proliferation is inhibited when they are treated with phorbol 12-myristate 13-acetate (PMA). Insulin and insulin-like growth factor I (IGF-I) are mitogens for the nontreated SH-SY5Y cells, whereas the proliferative response to such factor stimulation is lost upon differentiation, in spite of the fact that the receptors for insulin and IGF-I remain expressed and functional in the differentiated cells. Here we show that the PMA-induced differentiation of SH-SY5Y cells grown in a serum-free medium is strongly potentiated by nanomolar concentrations of IGF-I, as judged by morphology and markers for neuronal differentiation--e.g., neuropeptide tyrosine and growth-associated protein 43. Also, insulin and IGF-II potentiated the phorbol ester-induced differentiation, although less efficiently than IGF-I. Using blocking anti-receptor antibodies, it could be shown that the differentiation induced by these factors, in combination with PMA, was primarily mediated through the IGF-I receptor.
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