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- W4313347777 abstract "Abstract Previous studies in humans and mice have shown that gut intraepithelial lymphocytes (IELs) express oligoclonal TCR β-chain repertoires. These studies have either employed unseparated IEL preparations or focused on the CD8+ subsets. Here, we have analyzed the TCR β-chain repertoire of small intestinal IELs in PVG rats, in sorted CD4+ as well as CD8+ subpopulations, and important differences were noted. CD8αα and CD8αβ single-positive (SP) IELs used most Vβ genes, but relative Vβ usage as determined by quantitative PCR analysis differed markedly between the two subsets and among individual rats. By contrast, CD4+ IELs showed consistent skewing toward Vβ17 and Vβ19; these two genes accounted collectively for more than half the Vβ repertoire in the CD4/CD8 double-positive (DP) subset and were likewise predominant in CD4 SP IELs. Complementarity-determining region 3 length displays and TCR sequencing demonstrated oligoclonal expansions in both the CD4+ and CD8+ IEL subpopulations. These studies also revealed that the CD4 SP and CD4/CD8 DP IEL subsets expressed overlapping β-chain repertoires. In conclusion, our results show that rat TCR-αβ+ IELs of both the CD8+ and CD4+ subpopulations are oligoclonal. The limited Vβ usage and overlapping TCR repertoire expressed by CD4 SP and CD4/CD8 DP cells suggest that these two IEL populations recognize restricted intestinal ligands and are developmentally and functionally related." @default.
- W4313347777 created "2023-01-06" @default.
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- W4313347777 date "1999-03-01" @default.
- W4313347777 modified "2023-10-17" @default.
- W4313347777 title "Oligoclonality of Rat Intestinal Intraepithelial T Lymphocytes: Overlapping TCR β-Chain Repertoires in the CD4 Single-Positive and CD4/CD8 Double-Positive Subsets" @default.
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- W4313347777 doi "https://doi.org/10.4049/jimmunol.162.5.2683" @default.
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