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. 1992 Jun;60(6):2368–2374. doi: 10.1128/iai.60.6.2368-2374.1992

Staphylococcus aureus susceptibility to thrombin-induced platelet microbicidal protein is independent of platelet adherence and aggregation in vitro.

M R Yeaman 1, D C Norman 1, A S Bayer 1
PMCID: PMC257167  PMID: 1587603

Abstract

Bacterium-platelet interactions at the cardiac valve surface represent an important initial step in the induction of infective endocarditis (IE). This cell-cell interaction may play either a protagonistic role in the induction of IE via bacterial adherence to and aggregation of platelets or an antagonistic role via secretion of platelet-derived microbicidal molecules. We examined the spectrum and interrelationship of three aspects of the interaction of 20 clinical Staphylococcus aureus isolates with rabbit platelets in vitro: (i) S. aureus adherence to platelets; (ii) S. aureus-induced platelet aggregation; and (iii) S. aureus resistance to the action of thrombin-induced platelet microbicidal protein (PMP; low-molecular-weight cationic peptides contained in alpha granules). Among the 20 S. aureus isolates (11 bacteremia, 9 endocarditis), there was a heterogeneous distribution profile for each of the bacterium-platelet interaction parameters studied. For S. aureus-platelet adherence and S. aureus-induced platelet aggregation, 3 of 20 and 7 of 20 isolates tested were considered highly active for each respective parameter; 5 of 20 staphylococcal strains were deemed resistant to the bactericidal action of PMP. In addition, more endocarditis isolates (45%) were PMP resistant than strains from patients without endocarditis (19%). When analyzed concomitantly, there was a significant, positive correlation between S. aureus-platelet adherence and S. aureus-induced platelet aggregation among isolates (P = 0.003; r = 0.78). In contrast, there were no statistically significant relationships between either platelet adherence or aggregation and PMP resistance among these 20 S. aureus isolates. These data suggest that platelet adherence and aggregation are related abilities of S. aureus, while resistance to thrombin-induced PMP is an independent phenotypic characteristic and potential virulence factor.

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Selected References

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