Biased expression of individual T cell receptor V gene segments in CD4+ and CD8+ human peripheral blood T lymphocytes - PubMed (original) (raw)
Biased expression of individual T cell receptor V gene segments in CD4+ and CD8+ human peripheral blood T lymphocytes
J Grunewald et al. Eur J Immunol. 1991 Mar.
Abstract
The expression of seven different alpha and beta gene segments of the T cell receptor on normal human CD4+ and CD8+ T lymphocytes, respectively, was examined using V gene-specific monoclonal antibodies. We found a statistically significant (p less than 0.001) bias of the expression of four V gene products towards the CD4+ subpopulation. In every individual analyzed, the V beta 5.1 gene segment was expressed to a higher degree among CD4+ compared to CD8+ cells, with a median value of 4.8% among CD4+ cells and 1.5% among CD8+ cells. There was also a statistically significant skewness in the usage of the V beta 6.7, V beta 8 and V beta 12 gene segments towards the CD4+ T cell population, but not as dominating as for the V beta 5.1. Lymphocytes from umbilical cord blood showed similar skewed reactivities for the V beta 5.1, V beta 6.7 and V beta 12-specific monoclonal antibodies. Aspects of positive and negative selection, as possible explanations for these findings, are discussed.
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