PMID: 9159408Jan 1, 1997Paper

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

Microbiology and Immunology
Y Aoki, Y Yoshikai

Abstract

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 microg 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 Vbeta3 and Vbeta11 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 Vbeta3+ T cells during 2 days of culturing, whereas without restimulation, a marked reduction of Vbeta3+ 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 rechal...Continue Reading

References

Jan 1, 1991·Annual Review of Immunology·A HermanA M Pullen
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Citations

Dec 18, 2001·International Journal of Cancer. Journal International Du Cancer·S L KominskyH M Johnson
Jul 12, 2007·Acta Biochimica Et Biophysica Sinica·Yang HuangBin Ma
Apr 9, 2002·The Journal of Immunology : Official Journal of the American Association of Immunologists·Luqiu ChenTakehiko Uchiyama

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