Further clonal expansion of T cells upon rechallenge of superantigen staphylococcal enterotoxin A

Yoshiyasu Aoki, Yasunobu Yoshikai

    研究成果: ジャーナルへの寄稿学術誌査読

    7 被引用数 (Scopus)

    抄録

    Superantigens are known to induce clonal anergy and/or deletion in reactive T cells peripherally. This study was undertaken to investigate the T-cell status early after exposure to staphylococcal enterotoxin A (SEA) in vivo and in vitro. At the peak of clonal expansion following the administration of 5 μg SEA (i.e., 2 days after the injection), C57BL/6 mice were rechallenged with the same dose of SEA in vivo. The secondary stimulation augmented clonal expansion of the T cells bearing Vβ3 and Vβ11 in both CD4+ and CD8+ populations. In vitro restimulation of the spleen cells taken from the SEA-primed mice also induced further expansion of the Vβ3+ T cells during 2 days of culturing, whereas without restimulation, a marked reduction of Vβ3+ T cells occurred. The spleen cells from the SEA- primed mice were hyper-reactive to in vitro restimulation with SEA as measured by 3H.TdR uptake on day 1 of culturing, but augmented proliferation leveled off thereafter. By day 3, the values of 3H-TdR uptake were less than 20% of those of the controls in which spleen cells from native mice were stimulated with SEA in vitro. These results suggest that T cells exposed to SEA in vivo are still capable of proliferating upon SEA rechallenge, but subsequently, the proliferation starts to wane.

    本文言語英語
    ページ(範囲)337-343
    ページ数7
    ジャーナルMICROBIOLOGY and IMMUNOLOGY
    41
    4
    DOI
    出版ステータス出版済み - 1997

    !!!All Science Journal Classification (ASJC) codes

    • 微生物学
    • 免疫学
    • ウイルス学

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