Abstract:
:The potential value of in vitro cytotoxic T lymphocyte (CTL) assays for predicting the occurrence of graft vs host disease (GVHD) following allogeneic bone marrow transplantation was evaluated in 12 mouse donor-host combinations associated with various degrees of GVHD. These donor-host combinations were selected after evaluation of GVHD triggered by minor histocompatibility antigens (MiHA) in 24 allogeneic strain combinations derived from six strains of H-2b mice. Recipients (n = 475), previously submitted to total body irradiation (9.5 Gy), were transplanted with 10(7) bone marrow cells along with 5 x 10(7) spleen cells. While lethal GVHD was observed in half of the strain combinations, it was possible to select 12 donor-host combinations characterized by severe, mild, or absent GVHD. When levels of anti-host CTL activity were assessed following in vivo priming and in vitro boosting, strong CTL-mediated cytotoxicity was observed in all combinations whether they developed GVHD or not. CTL frequency measured by limiting dilution analysis (LDA) ranged from 1/16880-1/306. The Spearman rank test revealed no positive correlation between GVHD intensity and donor anti-host CTL activity assayed either in bulk culture experiments or in LDA conditions. These results indicate that MiHA capable of triggering potent CTL responses in vitro do not necessarily initiate GVHD, and that in vitro measurement of donor CTL activity against host-type Con A blasts is not a predictive assay for anti-MiHA GVHD. However, the possibility to recruit CTL populations targeting host MiHA expressed specifically on hematopoietic cells suggests a novel therapeutic strategy for the cure of hematopoietic malignancies. Indeed, transplantation of donor hematopoietic stem cells supplemented with T cells aimed at MiHA specifically expressed by host hematopoietic cells, could possibly potentiate the desirable graft vs leukemia effect without increasing the risk of GVHD.
journal_name
Immunogeneticsjournal_title
Immunogeneticsauthors
Fontaine P,Langlais J,Perreault Cdoi
10.1007/BF00215256subject
Has Abstractpub_date
1991-01-01 00:00:00pages
222-6issue
4eissn
0093-7711issn
1432-1211journal_volume
34pub_type
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