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. 1992 Mar;75(3):420–426.

B-cell maturation in chronic lymphocytic leukaemia. IV. T-cell-dependent activation of leukaemic B cells by staphylococcal enterotoxin 'superantigens'.

X Duan 1, C Nerl 1, O Janssen 1, D Kabelitz 1
PMCID: PMC1384734  PMID: 1572690

Abstract

Staphylococcal enterotoxins (SE) are potent T-lymphocyte activators that stimulate T cells by directly cross-linking HLA-DR molecules on antigen-presenting cells with the V beta gene products of the T-cell receptor. The different SE activate all T cells expressing a given V beta, and, therefore, have been termed 'superantigens'. Here we show that SE are potent activators of leukaemic B cells from patients with chronic lymphocytic leukaemia (CLL). Purified B cells from seven of eight CLL patients with high WBC counts (greater than 80,000/microliters) responded to one or several of the tested SE (SEA, SEB, SEC1, SED, SEE) by proliferation ([3H]TdR incorporation) and/or Ig secretion. In several instances, the response of leukaemic B cells to SE was much stronger than was the response to other known B-cell activators including EBV, pokeweed mitogen (PWM), phorbolester (TPA), and Staphylococcus aureus Cowan I (SAC). The activation of leukaemic B cells by SE was strictly dependent on the addition of irradiated T cells isolated from healthy donors. FACS analysis of cultured cells ensured that the proliferating cells were indeed B cells. Taken together, these results demonstrate that SE are strong T-cell-dependent B-cell activators that, in some cases, can stimulate maturation of leukaemic B cells which are refractory to other activation signals.

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Selected References

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