Myeloid differentiation antigen defined by a monoclonal antibody IF10

American Journal of Hematology
K YamadaK Kumagai

Abstract

A monoclonal antibody of IgM class that defines the antigen present on human peripheral blood granulocytes was produced and characterized. This monoclonal antibody (IF10) was made from a single fusion between P3-X63-Ag8-U1 (P3U1) myeloma cells and splenocytes from a BALB/c mouse immunized against human cultured monocytoid cell line THP-1 cells. IF10-defined antigen(s) was expressed on the cells of granulocyte lineage such as peripheral blood granulocytes and metamyelocytes, myelocytes, promyelocytes, and a part of myeloblasts in the normal bone marrow, whereas it was not detected on resting and activated T lymphocytes, B lymphocytes, adherent monocytes, and thymocytes. The IF10-defined antigen was also expressed on cultured monocytoid cell lines as well as myeloid and myeloid/erythroid (K-562) cell lines. T lymphoblastoid cell lines, particularly those representing the T cells at an early thymocyte level, and a part of null cell lines were also reactive to IF10. Therefore, IF10 may be a unique monoclonal antibody that defines an antigen(s) which is expressed on almost whole stages of granulocytes and early stages of macrophages and T-cell lineages, and possibly during very early stages of erythroid lineage.

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