Abstract
We have recently reported that retinoic acid (RA) induced the expression of trkA, the high affinity receptor for nerve growth factor (NGF), in human chronic myelogenous leukemia K562 cells. In this paper, we examined the ability of several other differentiation inducers to regulate the expression of trkA and NGF in K562 cells. We found that the expression of trkA was dramatically induced by the two megakaryocyte lineage inducers sodium butyrate (NaBut) and phorbol 12-myristate 13-acetate (PMA), but not by the two erythrocyte lineage inducers hemin or 1-β- d-arabinofuranosyl cytosine (Ara-C). Furthermore, activation of the up-regulated trkA receptor by exogenous NGF potentiated the megakaryocytic differentiation of K562 cells induced by NaBut and PMA. Our results demonstrated that trkA is one of the essential genes that are up-regulated and involved in the megakaryocytic differentiation of K562 leukemia cells triggered by these differentiation inducers. Our findings suggest that NGF, in addition to its pivotal roles in the nervous system, may also play important roles in hematopoietic differentiation.
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