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. 1992 Feb 1;175(2):453–460. doi: 10.1084/jem.175.2.453

Acquired Mls-1a-like clonal deletion in Mls-1b mice

PMCID: PMC2119124  PMID: 1346271

Abstract

BALB/c mice (H-2d, Mls-1b) from one colony progressively modify their T cell repertoire during aging, by deleting T cells that express products of the V beta 6 and V beta 8.1 genes of the T cell receptor. Clonal deletion occurs only in 50% of mice between 27 and 43 wk of age, affecting thymus, spleen, and lymph node T cells. The phenomenon is progressive and seems to affect nearly all thymuses between 14 and 19 wk of age. CD4+CD8- mature T cells are more affected than CD4-CD8+ cells. In the thymus, deletion occurs at the stage of immature J11d+ cells expressing a high level of V beta 6, while J11d+V beta 6low- expressing cells are not modified. Clonal deletion is thus an early phenomenon that deletes cells of the immature generative compartment in the thymus. This Mls-1a-like clonal deletion is associated neither with the expression of an Mls-1a-like antigen that could be identified in mixed lymphocyte reaction in vitro, nor with the presence of Mtv-7, the endogenous mouse mammary tumor virus (MMTV) proviral loci. Spleen cells, bone marrow cells, and total thymocytes injected into newborn thymuses cannot induce V beta 6+ cell deletion. However, newborn thymuses grafted into old BALB/c mice behave like their recipients, suggesting that a new antigen, present in these old BALB/c mice, is indeed able to induce an Mls-1a-like clonal deletion. As other BALB/c colonies tested do not behave in same way, the hypothesis of a new exogenous deleting factor rather than a genetic transmission is likely. This may suggest that acquired clonal deletion is a more common phenomenon than expected, and may be the spontaneous reaction of the immune system to the introduction of a new retrovirus or other superantigen.

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Selected References

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