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Infection and Immunity, March 2005, p. 1578-1583, Vol. 73, No. 3
0019-9567/05/$08.00+0     doi:10.1128/IAI.73.3.1578-1583.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Staphylococcus aureus Capsular Polysaccharide Types 5 and 8 Reduce Killing by Bovine Neutrophils In Vitro

Annette H. Kampen,^1* Tore Tollersrud,¹ and Arve Lund¹

National Veterinary Institute, Oslo, Norway¹

Received 30 September 2004/ Returned for modification 29 October 2004/ Accepted 10 November 2004

Isogenic variants of Staphylococcus aureus strain Reynolds expressing either no capsule or capsular polysaccharide (CP) type 5 (CP5) or type 8 (CP8) were used to assess the effect of CP on bacterial killing and the respiratory burst of bovine neutrophils. The effects of antisera specific for CP5 and CP8 were also evaluated. The killing of live bacteria by isolated neutrophils was quantified in a bactericidal assay, while the respiratory burst after stimulation with live bacteria in whole blood was measured by flow cytometry. The expression of a CP5 or CP8 capsule protected the bacteria from being killed by bovine neutrophils in vitro (P < 0.001), and the capsule-expressing variants did not stimulate respiratory burst activity in calf whole blood. The addition of serotype-specific antisera increased the killing of the capsule-expressing bacteria and enhanced their stimulating effect in the respiratory burst assay (P < 0.01). When the S. aureus variants were grown under conditions known not to promote capsule expression, there were no significant differences between them. The present study demonstrates that the expression of S. aureus CP5 or CP8 confers resistance to opsonophagocytic killing and prevents the bacteria from inducing respiratory burst of bovine neutrophils in vitro and that these effects can be reversed by the addition of serotype-specific antisera.

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* Corresponding author. Mailing address: National Veterinary Institute, P.O. Box 8156 Dep., N-0033 Oslo, Norway. Phone: 47 23 21 63 85. Fax: 47 23 21 63 01. E-mail: annette.kampen{at}vetinst.no.

Editor: F. C. Fang

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Infection and Immunity, March 2005, p. 1578-1583, Vol. 73, No. 3
0019-9567/05/$08.00+0     doi:10.1128/IAI.73.3.1578-1583.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

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