title: Comparison of the effects of CD3 and CD5 donor T cell depletion on graft-versus-leukemia in a murine model for MHC-matched unrelated-donor transplantation.
abstract: Studies were designed to prospectively evaluate the effects of selective depletion for donor T cells strongly expressing the CD3 and CD5 pan-T antigens on the incidence of leukemia relapse following bone marrow transplantation. This evaluation was performed under controlled conditions in a mouse model for MHC-matched unrelated-donor transplantation, employing Rauscher leukemic SJL/J mice as the recipients and leukemia-resistant B10.S mice as the donors. Selective donor cell depletion for CD3 and CD5 was accomplished ex vivo prior to transplantation by incubation with the appropriate monoclonal antibody plus complement. When untreated, Rauscher leukemia resulted in a 97% fatality incidence. This was reduced to 30% by the transplant of non-depleted B10.S cells, with another 37% recipients dying from GVHD and graft failure. CD3 depletion reduced the GVHd deaths to 6% but increased relapse to 62%. Conversely, CD5 depletion had no effect on relapse or on GVHD but did significantly increase graft failure, thus negatively affecting survival. Evaluation of the results, done in conjunction with flow cytometry analysis of the effects of CD3 versus CD5 depletion on the donor cells, suggests that the T cells involved in suppressing leukemic relapse in these studies, and hence contributing to the GVL response, most probably had a phenotype of CD3+, CD5-.
authors.affiliation: Allegheny-Singer Research Institute, Allegheny General Hospital, Pittsburgh, PA 15212.
authors.forename: J P
authors.initials: JP
authors.lastname: Okunewick
authors.forename: D L
authors.initials: DL
authors.lastname: Kociban
authors.forename: L L
authors.initials: LL
authors.lastname: Machen
authors.forename: M J
authors.initials: MJ
authors.lastname: Buffo
mesh_terms: D000818:Animals; D015703:Antigens, CD; D016026:Bone Marrow Transplantation / Q000276:immunology*; D017252:CD3 Complex; D018956:CD5 Antigens; D005260:Female; D006087:Graft vs Host Reaction / Q000276:immunology*; D007942:Leukemia, Experimental / Q000097:blood / Q000276:immunology / Q000601:surgery*; D007958:Leukocyte Count; D008212:Lymphocyte Depletion; D051379:Mice; D011925:Rauscher Virus; D012008:Recurrence; D012192:Retroviridae Infections / Q000097:blood / Q000276:immunology / Q000601:surgery; D013154:Spleen / Q000473:pathology; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D014412:Tumor Virus Infections / Q000097:blood / Q000276:immunology / Q000601:surgery
chemical_list: D015703:Antigens, CD; D017252:CD3 Complex; D018956:CD5 Antigens