K562 cells resistant to phorbol 12-myristate 13-acetate-induced growth arrest: dissociation of mitogen-activated protein kinase activation and Egr-1 expression from megakaryocyte differentiation.

Abstract excerpt

The K562 cell line undergoes megakaryocytic differentiation in response to phorbol 12-myristate 13-acetate (PMA) stimulation. This event correlates with mitogen-activated protein kinase activation, cell cycle arrest, and expression of the Egr-1 transcription factor. We have isolated K562 cells that are resistant to the growth-inhibitory action of PMA. Molecular characterization demonstrates that PMA resistance is...

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