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Removal of T cells from bone marrow for transplantation: a monoclonal
antilymphocyte antibody that fixes human complement
G Hale, S Bright, G Chumbley, T Hoang, D Metcalf, AJ Munro and H Waldmann
Graft-versus-host disease is one of the major problems in clinical bone
marrow transplantation. Many experiments in animals have shown that it
could be greatly reduced if mature T lymphocytes were removed from the
donor marrow. Here we describe a new rat monoclonal antibody, CAMPATH 1,
which is suitable for depleting lymphocytes from human marrow grafts.
CAMPATH 1 is an IgM that fixes human complement. It binds to both T and B
lymphocytes and some monocytes but not to other hemopoietic cells. When
peripheral blood mononuclear cells were treated with CAMPATH 1 and
complement, more than 99% of lymphocytes were killed and viable T cells
could no longer be detected. Under these conditions, in vitro
multipotential erythroid and myeloid colony-forming cells were unaffected.
As well as being used for in vitro treatment of bone marrow to remove T
cells, CAMPATH 1 could potentially be applied to other experimental and
clinical situations where depletion of lymphoid cells is required,
including serotherapy to achieve immunosuppression for organ transplants or
to treat lymphocytic leukemias.
Volume 62,
Issue 4,
pp. 873-882,
10/01/1983
Copyright © 1983 by The American Society of Hematology

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