Histone H3 phosphorylation in human monocytes and during HL-60 cell differentiation.

Abstract:

:Phosphorylation of the nucleosome core histone H3 (H3) on Ser-10 is thought to be a prerequisite for chromatin condensation at mitosis. Although during interphase, cell differentiation, or mitogenic activation of quiescent cells, changes in chromatin structure that involve local chromatin condensation/decondensation also occur, little is known about H3 phosphorylation during these transitions. Using the recently developed sensitive marker to monitor H3 phosphorylation, namely, the mAb that recognizes the phosphorylated epitope of H3 (anti-H3-P mAb), the status of H3 phosphorylation was assayed in individual human lymphocytes after their mitogenic stimulation (G0 to G1 transition) and in human leukemic HL-60 cells induced to differentiate by all-trans-retinoic acid (RA), 1,25-dihydroxyvitamin D3 (vit D3), dimethyl sulfoxide (DMSO), or phorbol myristate acetate (PMA). Multiparameter flow cytometry was used to correlate H3 phosphorylation with cell cycle position. The specificity of the anti-H3-P mAb was confirmed by the loss of its binding following cell treatment with alkaline phosphatase. The presence of phosphorylated H3 was detected during interphase in HL-60 cells and in normal lymphocytes at a level severalfold lower than during mitosis. No significant changes in H3 phosphorylation were observed during lymphocyte stimulation. Unexpectedly, the level of H3 phosphorylation was over fourfold higher in monocytes than in lymphocytes or granulocytes from peripheral blood. The punctate pattern of labeling with anti-H3-P mAb in monocyte nuclei suggests that H3 is phosphorylated in small clusters of adjacent nucleosomes. Differentiation of HL-60 cells was accompanied by a rise in H3 phosphorylation, which was higher after induction by RA, vit D3, and PMA (approx. threefold) than after DMSO (approximately 20%). The data indicate that in addition to being a critical event during chromatin condensation at mitosis, H3 phosphorylation plays a role during chromatin changes accompanying differentiation of HL-60 cells, in particular, along the monocytic lineage. The high level of H3 phosphorylation in monocytes may serve as a marker of these cells and is being explored as a possible diagnostic and prognostic tool in monocytic leukemias.

journal_name

Exp Cell Res

authors

Juan G,Traganos F,Darzynkiewicz Z

doi

10.1006/excr.1998.4283

subject

Has Abstract

pub_date

1999-01-10 00:00:00

pages

212-20

issue

1

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(98)94283-5

journal_volume

246

pub_type

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