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The Journal of Immunology, Vol 156, Issue 11 4209-4216, Copyright © 1996 by American Association of Immunologists
ARTICLES |
BC Sydora, L Brossay, A Hagenbaugh, M Kronenberg and H Cheroutre
Department of Microbiology and Immunology and the Molecular Biology Institute, University of California at Los Angeles, CA 90095, USA.
Intestinal intraepithelial lymphocytes (IEL) are mostly CD8 single positive T cells. IEL with a TCR-alpha(beta) that are CD8 single positive are absent from beta(2)-microglobulin (beta(2)m)-deficient mice, consistent with the idea that these IEL, like other TCR- alpha(beta)+, CD8+ T cells, require class I molecules for positive selection. In contrast, here we show that substantial numbers of TCR- alpha(beta)+, CD8 single positive IEL are present in mice deficient for the transporter associated with Ag processing 1 (TAP 1) gene, although T cells with this phenotype are absent from thymus, spleen, and lymph nodes of these same mice. The majority of TCR-alpha(beta)+, CD8 single positive IEL in TAP-deficient mice expresses CD8 molecules composed of alpha(alpha) homodimers and they express a diverse set of V(beta) gene segments. In addition, the number of TCR-alpha(beta)+, CD4/CD8 double positive IEL is decreased in beta(2)m-deficient mice but not in TAP- deficient mice. The dependence of the two TCR-alpha(beta)+ IEL populations that express CD8alpha(alpha) homodimers on beta(2)m as opposed to TAP molecules is striking. It suggests that TAP-independent but beta(2)m-requiring nonclassical class I molecules expressed by cells in the intestine, such as the thymus leukemia Ag and CD1, could play a pivotal role in the development and/or the accumulation of major subpopulations of TCR-alpha(beta)+ IEL.
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