Induction by Phorbol Esters of Macrophage Differentiation in Human Leukaemia Cell Lines does not Require Cell Division

Abstract
Phorbol esters can induce differentiation into macrophage-like cells in the 2 human myeloid leukemia cell lines HL-60 and KG-1. Phorbol ester-induced differentiation of blast cells into cells with the morphologic, histochemical and phagocytic characteristics of macrophages did not require 3H-thymidine incorporation. Phorbol ester induced macrophage differentiation does not require DNA synthesis.