Appearance of TCR-αβ+CD4-CD8- skin intraepithelial lymphocytes in radiation bone marrow chimeras

M. Ogimoto, G. Matsuzaki, Y. Yoshikai, Y. Tauchi, K. Nomoto

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    7 Citations (Scopus)


    Thymocytes expressing homogeneous TCR Vγ5/Vδ1 gene without N nucleotide addition (canonical sequence) have been reported to be positively selected in fetal thymus. Because skin intraepithelial lymphocytes (s-IEL) also express canonical sequence, it is proposed that s-IEL are generated by an epidermis- specific homing of these positive selected fetal Vγ5/Vδ1-bearing thymocytes. We have reported that positive selection of Vγ5+ thymocytes is not seen in AKR/J→C3H/He bone marrow chimeras. In this report, we analyzed the phenotype of donor-derived s-IEL from AKR/J→C3H/He bone marrow chimeras that appeared in the absence of positive selection of Vγ5-bearing thymocytes. We found interestingly that almost all donor-derived s-IEL in the bone marrow chimeras expressed TCR-αβ and lack expression of both CD4 and CD8. Furthermore, TCR-αβ+ s-IEL were detected in adult-thymectomized bone marrow chimeras, indicating that the TCR-αβ+ s-IEL are extrathymically derived. All these results suggest that the s-IEL expressing TCR-αβ appear extrathymically in the absence of positive selection of Vγ5/Vδ1-bearing thymocytes. Our results may also explain the contradicting result between human s-IEL, which are TCR-αβ+CD4-CD8- and murine s-IEL, and suggest the importance of extrathymic T cell differentiation pathway of the TCR-αβ lineage in immune surveillance.

    Original languageEnglish
    Pages (from-to)3000-3006
    Number of pages7
    JournalJournal of Immunology
    Issue number6
    Publication statusPublished - Jan 1 1993

    All Science Journal Classification (ASJC) codes

    • Immunology and Allergy
    • Immunology


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