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- W2415390930 abstract "Specific populations of lymphocytes play a significant role in the regulation of megakaryocyte (MK) development. CAMPATH 1G (C1G) and CAMPATH 1M (C1M) are T lymphocyte (TL)-specific monoclonal antibodies (MABs) that are routinely employed to reduce graft-vs.-host disease (GVHD) in allogeneic bone marrow transplantation (BMT). Following BMT, engraftment of the erythroid and myeloid lineages is prompt, but prolonged thrombocytopenia often prevails. We therefore studied the effect on MK colony formation of treating donor bone marrow (BM) with the CAMPATH MABs. MK colonies were grown in plasma clots using postirradiation aplastic canine serum (PICS-J) as MK colony-stimulating factor (MK-CSF). C1M, which causes TL destruction by complement-dependent lysis, had no effect on MK cloning efficiency. C1G is not lytic but causes the elimination of TL in the BMT recipients via antibody-dependent cell cytotoxicity (ADCC). Treatment of donor BM with C1G significantly enhanced the number of early burst-forming units (BFU-MK) and late colony-forming units (CFU-MK) and had no effect on granulocyte-macrophage (CFU-GM) or erythroid (BFU-E) colonies. Enhancement of MK cloning efficiency was concentration-dependent between 0.03 and 3 micrograms MAB/10(6) BM mononuclear cells (MNC). Similar results were observed when C1G-treated TL or purified CD4+ TL were co-cultured with untreated autologous BMMNC or peripheral blood (PB) MNC. Conditioned medium (CM) from C1G-treated TL and CD4+ TL contained soluble factors that, when combined with suboptimal doses of PICS-J, potentiated MK growth. C1G in combination with PICS-J also stimulated TL proliferation in a dose-dependent manner. The T cell CM did not contain elevated levels of interleukin-3 (IL-3), IL-6, IL-1 beta, or GM-CSF. Our data provide additional evidence for the involvement of activated TL, and perhaps novel soluble T cell products, in the immunomodulation of megakaryocytopoiesis." @default.
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- W2415390930 date "1993-10-01" @default.
- W2415390930 modified "2023-09-23" @default.
- W2415390930 title "Effect of bone marrow T lymphocytes treated with CAMPATH 1G on megakaryocyte colony formation." @default.
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