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. 1992 Jan 1;175(1):91–98. doi: 10.1084/jem.175.1.91

T cell-mediated lethal shock triggered in mice by the superantigen staphylococcal enterotoxin B: critical role of tumor necrosis factor

PMCID: PMC2119077  PMID: 1730929

Abstract

Because mice are more resistant than humans to the pathogenic effects of bacterial toxins, we used D-Galactosamine- (D-Gal) sensitized mice as a model system to evaluate potential toxic shock symptoms triggered by the superantigen staphylococcal enterotoxin B (SEB). We show that similar to endotoxin (lipopolysaccharide) [LPS], the exotoxin SEB causes lethal shock within 8 h in D-Gal-sensitized mice, inducing 100% and about 50% lethality with 20 and 2 micrograms SEB, respectively. The lethal shock triggered by the superantigen SEB is mediated by T cells, a conclusion based on the observation that T cell repopulation of SCID mice conferred sensitivity to SEB. Since CSA also conferred protection, the role of T cell-derived lymphokines in mediating lethal shock was evaluated. Within 30-60 min after SEB injection, serum tumor necrosis factor (TNF) levels peaked, followed immediately by interleukin-2 (IL- 2). Serum-borne lymphokines were detected well in advance of signs of T cell activation, as assessed by IL-2 receptor expression of SEB- reactive V beta 8+ T cells. Passive immunization with anti-TNF- alpha/beta-neutralizing monoclonal antibody also conferred protection, indicating that it is TNF which is critical for initiating toxic shock symptoms. Taken together, this study defines basic differences between endotoxin (LPS)- and exotoxin (SEB)-mediated lethal shock, in that the former is mediated by macrophages and the latter by T cells. Yet the pathogenesis distal to the lymphokine/cytokine-producing cells appears surprisingly similar in that TNF represents a key mediator in inducing shock.

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Selected References

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