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Infection and Immunity, May 1999, p. 2312-2318, Vol. 67, No. 5
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Effects of Staphylococcal Enterotoxins on Human Neutrophil Functions and Apoptosis

Dale A. Moulding,1 Catherine Walter,1 C. Anthony Hart,2 and Steven W. Edwards1,*

School of Biological Sciences1 and Department of Medical Microbiology,2 University of Liverpool, Liverpool L69 7ZB, United Kingdom

Received 6 November 1998/Returned for modification 19 January 1999/Accepted 24 February 1999

Staphylococcal enterotoxins have marked effects on the properties of T cells and monocytes and have recently been reported to affect neutrophil function. In this study, we investigated the abilities of staphylococcal enterotoxins A and B and toxic shock syndrome toxin 1 to affect respiratory burst activity and to delay apoptosis in human neutrophils. When cultures containing approximately 97% neutrophils were tested, the toxins all delayed neutrophil apoptosis in a dose-dependent manner and induced the expression of Fcgamma RI on the neutrophil cell surface. These effects on apoptosis and expression of Fcgamma RI were largely abrogated by the addition of a neutralizing anti-gamma interferon antibody. Similarly, the effects of these toxins on phorbol ester-induced chemiluminescence were decreased after neutralization of gamma interferon. These effects on neutrophil function were mimicked by the addition of conditioned medium from peripheral blood mononuclear cells incubated with the toxins, and again, neutralizing anti-gamma interferon antibodies largely negated the effects. However, when highly purified neutrophils prepared by immunodepletion of T cells and major histocompatibility complex class II-expressing cells were analyzed, the toxins were without effect on apoptosis and Fcgamma RI expression, but granulocyte-macrophage colony-stimulating factor and gamma interferon could still delay apoptosis. These data indicate that these toxins have no direct effect on neutrophil apoptosis but can act indirectly via the production of T-cell-derived and monocyte-derived cytokines. It is noteworthy that such effects are detected in neutrophil suspensions containing only 3% contamination with T cells and other mononuclear cells.

* Corresponding author. Mailing address: School of Biological Sciences, Life Sciences Building, University of Liverpool, Liverpool L69 7ZB, United Kingdom. Phone: 44 (0)151 794 4363. Fax: 44 (0)151 794 4349. E-mail: sbir12{at}liverpool.ac.uk.

Infection and Immunity, May 1999, p. 2312-2318, Vol. 67, No. 5
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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