The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 154, 88-100, Copyright © 1981 by Rockefeller University Press

ARTICLES

Human megakaryocytes. II. Expression of platelet proteins in early marrow megakaryocytes

EM Rabellino, RB Levene, LL Leung and RL Nachman

Analysis of various platelet proteins by immunofluorescence demonstrated that platelet glycoproteins Ib, IIb, and IIIa, as well as plasma factor VIII antigen (factor VIII:AGN), platelet factor 4, and fibronectin are present in the vast majority of morphologically recognizable megakaryocytes. In addition, a small number of lymphoid- like mononuclear marrow cells, representing approximately 1.4-- 2.9/10(4) marrow cells, was found to express the same platelet proteins. This population of early marrow megakaryocytes is analogous to small acetylcholinesterase-positive rat and mouse marrow cells. Fc receptors for IgG were expressed in all megakaryocytes and megakaryocyte precursors, whereas the Ia antigen was detected only on a proportion of mature megakaryocytes and not on only early or precursor megakaryocytes. Platelet glycoproteins Ib, IIb, and IIIa, as well as factor VIII:AGN, and platelet factor 4 were established as distinct markers for marrow megakaryocytes and may be helpful for identifying megakaryocytic cells as well as for monitoring events of megakaryocyte differentiation.
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