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Arteriosclerosis, Thrombosis, and Vascular Biology. 1994;14:1210-1214

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Arteriosclerosis and Thrombosis, Vol 14, 1210-1214, Copyright © 1994 by American Heart Association

ARTICLES

Diversity of T-cell antigen receptor V beta gene utilization in advanced human atheroma

SJ Swanson, A Rosenzweig, JG Seidman and P Libby
Department of Medicine, Harvard Medical School, Boston, Mass. 02115.

Human atheromata contain T lymphocytes, but knowledge of the function and receptor specificity of these cells is limited. Immunohistochemical studies have established that T cells in advanced human carotid plaques express predominantly the alpha/beta form of the T-cell receptor (TCR). We then compared the use of variable region genes of the beta-chain (V beta) of the TCR for antigen by analysis of 14 carotid plaques and peripheral blood samples obtained at carotid endarterectomy. We used a direct approach that avoids isolation and culture of T cells. RNA extracted from lesions and peripheral blood mononuclear cells was reverse transcribed and amplified by polymerase chain reaction (PCR) to determine rearrangements of 18 V beta sequences. PCR products were visualized on Southern blots using a probe internal to the PCR primers. Input cDNA from lesions and peripheral blood was adjusted to yield equivalent signals for a conserved region of the TCR beta-chain to permit comparisons. As expected, utilization of TCR V beta genes in peripheral blood cells was nonselective: an average of 17 of 18 V beta regions yielded signals (n = 14). Frequency of variable-region gene usage in lesions and blood was highly concordant: of 252 sequences tested (14 samples, 18 sequences per sample), 240 were identified in peripheral blood versus 207 in plaques. V beta genes 10 and 11 were not expressed in plaques, a significant difference when compared with peripheral blood (P = .0001 by chi 2). However, the remaining 16 genes showed no significant differences. This analysis indicates that T cells generally express a diverse pattern of V beta genes within complex human atheroma.


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