Thymic dependence of invariant V alpha 14+ natural killer-T cell development - PubMed (original) (raw)

Thymic dependence of invariant V alpha 14+ natural killer-T cell development

F Tilloy et al. Eur J Immunol. 1999 Oct.

Free article

Abstract

Both thymic and extrathymic bone marrow (BM)-derived pathways for the development of CD1 reactive, Valpha14-Jalpha281(+) NK1.1(+) T cells have been suggested. In this report, we sought evidence for extrathymic NK-T cell development using two approaches. First, BM cells from gammac-deficient mice were examined for the presence of Valpha14-Jalpha281 transcripts. Since intrathymic NK-T cell selection is gammac independent, we predicted that gammac(-) BM cells should also harbor these specific TCRalpha chains. Second, Valpha14-Jalpha281 transcripts were analyzed in BM cells from lethally irradiated, thymectomized mice reconstituted with fetal liver hematopoietic precursors. All donor-derived T cell development in these chimeras is by definition extrathymic. In both cases, we failed to detect invariant Valpha14(+) TCRalpha chain transcripts. These experiments call into question the significance of an extrathymic pathway of development for Valpha14(+) NK1.1(+) CD1-reactive T cells.

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Thymic dependence of invariant V alpha 14+ natural killer-T cell development - PubMed (original) (raw)