Open AccessT CELL DEPLETION OF HUMAN BONE MARROW USING MONOCLONAL ANTIBODY AND COMPLEMENT-MEDIATED LYSIS
Author(s) -
T. G. Sharp,
David H. Sachs,
Anthony S. Fauci,
Gerald L. Messerschmidt,
Steven A. Rosenberg
Publication year - 1983
Publication title -
transplantation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.45
H-Index - 204
eISSN - 1534-6080
pISSN - 0041-1337
DOI - 10.1097/00007890-198302000-00002
Subject(s) - bone marrow , monoclonal antibody , immunology , concanavalin a , antibody , microbiology and biotechnology , biology , t lymphocyte , t cell , antigen , immune system , in vitro , biochemistry
Human bone marrow was harvested from surgically resected bones of 25 patients and was tested for the presence of mature T cells. An average of 6.5% (+/- 1.2% SE) of nucleated bone marrow cells formed spontaneous rosettes with sheep red blood cells. Functional T cells in bone marrow were also identified by characteristic responses to alloantigens and the T cell mitogens concanavalin A (Con A) and phytohemagglutinin (PHA). The ability of three monoclonal antibodies (OKT.3, Lyt-3, and (Leu-1) to lyse peripheral T cells in the presence of rabbit complement was examined. All three reagents were found to be specifically lytic for mature T cells in peripheral blood. One reagent (Leu-1) was selected for use in depletion of T cells in human bone marrow. Seven of 10 experiments performed showed sufficient T cell responses to be evaluable. In all of these experiments, a marked reduction of T cells and T cell functions was observed. On the average, E rosettes were reduced 89.2% (+/- 3.0% SE) below medium controls while the mean PHA, Con A, and mixed lymphocyte culture (MLC) activity were completely eliminated to levels below background. In four experiments, colony-forming units (CFU-GM) in bone marrow were assayed following treatment with Leu-1 and showed a mean increase of 194% (+/- 32% SE) over medium controls. Since mature T cells are thought to be responsible for graft-versus-host disease in allogeneic bone marrow transplantation, this method of T cell depletion may be useful for preparing marrow for human bone marrow transplants.