Inhibition of natural killer cell-mediated bone marrow graft rejection by allogeneic major histocompatibility complex class I, but not class II molecules.
Eur J Immunol
; 25(5): 1286-91, 1995 May.
Article
em En
| MEDLINE
| ID: mdl-7774631
ABSTRACT
The role of major histocompatibility complex (MHC) class I and class II molecules in natural killer (NK) cell-mediated rejection of allogeneic, semisyngeneic and MHC-matched bone marrow grafts was investigated. The use of beta 2-microglobulin (beta 2m) -/- and beta 2m +/- mice as bone marrow donors to MHC-mismatched recipients allowed an analysis of whether the presence of semi-syngeneic and allogeneic MHC class I gene products would be triggering, protective or neutral, in relation to NK cell-mediated rejection. Loss of beta 2m did not allow H-2b bone marrow cells to escape from NK cell-mediated rejection in allogeneic (BALB/c) or semi-allogeneic (H-2Dd transgenic C57BL/6) mice. On the contrary, it led to stronger rejection, as reflected by the inability of a larger bone marrow cell inoculum to overcome rejection by the H-2-mismatched recipients. In H-2-matched recipients, loss of beta 2m in the graft led to a switch from engraftment to rejection. At the recipient level, loss of beta 2m led to loss of the capability to reject H-2-matched beta 2m-deficient as well as allogeneic grafts. When MHC class II-deficient mice were used as donors, the response was the same as that against donors of normal MHC phenotype allogeneic and semi-syngeneic grafts were rejected by NK cells, while syngeneic grafts were accepted. These data suggest a model in which allogeneic class I molecules on the target cell offer partial protection, while certain syngeneic class I molecules give full protection from NK cell-mediated rejection of bone marrow cells. There was no evidence for a role of MHC class II molecules in this system.
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Base de dados:
MEDLINE
Assunto principal:
Células Matadoras Naturais
/
Antígenos H-2
/
Antígenos de Histocompatibilidade Classe II
/
Transplante de Medula Óssea
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Rejeição de Enxerto
Idioma:
En
Ano de publicação:
1995
Tipo de documento:
Article