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The murine virus-infected erythroleukemia cells (MELC) has been used as a useful tool to examine the regulatory mechanism of the cytodifferentiation by the genetic approach. Addition of dimethylsulfoxide (DMSO) to the MELC culture induces erythroid differentiation. A study was made to assess whether stimulation of histone synthesis is associated with DMSO-induced differentiation of MELC during 4 days of culture in vitro. The synthesis of histone increased 2-fold in the 48 hr-incubated cells while the synthesis of non-histone protein was not stimulated. The histone synthesis was maximal at 48 hr and declined by 72 hr. 3H-leucine-labeled cells treated with DMSO was mixed with an equal weight of 14C-labeled control cells. Histones were isolated and fractionated on polyacrylamide gel. A 3.6-fold increase in 3H/14C ratio occurred in histone fraction 3 and 3.4-fold in histone fraction 2b. The data indicate that the stimulation of histone synthesis is an early event following DMSO treatment of MELC cells.

Histone synthesis and differentiation in murine virus-infected erythroleukemia cells.