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The Journal of Immunology, Vol 131, Issue 1 232-237, Copyright © 1983 by American Association of Immunologists

ARTICLES

Ontogeny of human hematopoietic cells: analysis utilizing monoclonal antibodies

P Rosenthal, IJ Rimm, T Umiel, JD Griffin, R Osathanondh, SF Schlossman and LM Nadler

Lymphoid and myeloid cells isolated from second trimester fetal lymphoid organs were characterized by utilizing a panel of monoclonal antibodies that define human lineage-restricted, differentiation, histocompatibility, and activation antigens. At distinct gestational stages, the appearance of morphologically identifiable lymphoid and myeloid cells paralleled the appearance of cells expressing definable lymphoid and myeloid antigens. The proportion of cells in fetal liver, bone marrow, and spleen that expressed histocompatibility, myeloid, and B cell antigens increased with fetal maturation. In contrast, even the earliest fetal thymuses studied were of a phenotype no different than that seen during later stages of ontogeny. Although the cellular lineage of most fetal hematopoietic cells could be identified by this panel of reagents, a considerable number of fetal liver and bone marrow cells did not express any of these antigens, suggesting the possibility that they might represent early hematopoietic progenitor cells. These studies support the notion that the adult cellular phenotype is the result of both an orderly acquisition of differentiation antigens and the migration of these primitive cellular populations to specific fetal organs. Identification of hematopoietic progenitors in fetal tissues may facilitate the identification and isolation of early lymphoid and myeloid progenitor cells in adults.


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