Abstract
Cells in a subculture system derived from long-term hamster bone marrow culture were induced to differentiate into hemoglobin-producing cells in response to added erythropoietin. Treatment of the subculture with dimethyl sulfoxide or other ‘Friend inducers’ but not 5-azacytidine effected no remarkable induction, though they enhanced the effect of externally added erythropoietin. 3-Aminobenzamide, a weak inducer of Friend cell differentiation [Morioka, K., K. Tanaka, M. Ishizawa and T. Ono: Dev. Growth Differ. 24, 507–512 (1982)], had a strong inhibitory effect on erythropoiesis in the subculture system. Phorbol esters and glucocorticoids (both are known to be strong inhibitors of Friend cell differentiation) acted as strong inhibitors of the differentiation in our system as well. The present system was shown to provide a useful in vitro model to compare the differentiation of normal erythroid progenitors with the previously established systems of neoplastic cells.
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