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. 1994 Feb 1;179(2):661–672. doi: 10.1084/jem.179.2.661

The CD8+ T cell repertoire in beta 2-microglobulin-deficient mice is biased towards reactivity against self-major histocompatibility class I

PMCID: PMC2191377  PMID: 8294874

Abstract

Beta 2-Microglobulin-deficient (beta 2m -/-) mice are reported to lack cell surface expression of major histocompatibility complex (MHC) class I molecules, CD8+ T cells, and the ability to mount MHC class I- specific T cell responses. We have observed that beta 2m -/- mice possess CD8+ T cells that can be induced to perform strong allospecific cytotoxic responses against nonself-MHC class I by in vivo priming. We report that these beta 2m -/- cytotoxic T lymphocyte (CTL) differ from those induced in beta 2m-positive littermates in that they cross-react and kill cells expressing self-MHC class I at normal ligand density with beta 2m. beta 2m -/- CTL could even be induced in primary mixed lymphocyte culture by self-MHC class I expressing stimulator cells, whereas allogeneic stimulator cells failed to elicit a response under similar conditions. Cells with a reduced cell surface MHC class I expression were less sensitive, while syngeneic beta 2m -/- cells were resistant to the beta 2m -/- CTL. This antiself-MHC reactivity could not be induced when beta 2m -/- T cells matured in an environment with normal MHC class I expression in bone marrow chimeric mice. Antiself- MHC reactivity was also observed against human peptide loading- deficient cells expressing the appropriate murine class I molecules, suggesting that affinity to self-MHC class I may occur irrespective of peptide content. The results fit with a model where positive and negative selection of CD8+ T cells in beta 2m -/- mice is mediated by low levels of MHC class I free heavy chains. In this model, low ligand density on selecting cells leads to positive selection of rare T cells that bind to low levels of MHC class I free heavy chains, resulting in a very small peripheral CD8+ compartment. Due to low density of the selecting ligand, negative selection does not remove T cells recognizing beta 2m-positive cells expressing self-MHC class I at normal ligand density, which generates a T cell repertoire that would be autoreactive in a beta 2m-positive littermate. The first "MHC deficient" animals thus paradoxically provide a tool for direct demonstration and analysis of self MHC bias in the T cell repertoire.

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Selected References

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