Increase in histone poly (ADP-ribosylation) in mitogen-activated lymphoid cells

Experimental Cell Research
T BoulikasG Dupuis

Abstract

Poly (ADP-ribosylated) histones appear to be intermediates in nuclear processes that involve DNA strand breaks. We have studied histone ADP-ribosylation in cellular lysates from activated human lymphoid cells in culture. Modified histones differing in the number of ADP-ribose groups gave separate bands upon two-dimensional gel electrophoresis. Cellular lysates from control cells contained histones modified with 1 to 15 ADP-ribose groups. Stimulation of the cells during culture with phytohemagglutinin (PHA) or a phorbol ester (TPA) as well as combinations of these two reagents led to a significant increase in the upper limit number of ADP-ribose groups attached to histones in the presence of divalent metal ions. Hyper (ADP-ribosylated) H2B carrying at least 32 ADP-ribose groups gave a distinctly characteristic pattern on two-dimensional gels showing that highly ordered enzymatic steps are followed for its synthesis. Moreover, it was found that PHA and/or TPA induces branching of the poly (ADP-ribose) on H2B. The increase in histone poly (ADP-ribosylation) following lymphocyte activation was less dramatic during incubation of cellular lysates in the absence of divalent metal ions. The increased histone modification observed in th...Continue Reading

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