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. 1977 May;16(2):649–654. doi: 10.1128/iai.16.2.649-654.1977

Interaction of lipoteichoic acid of group A streptococci with human platelets.

E H Beachey, T M Chiang, I Ofek, A H Kang
PMCID: PMC421005  PMID: 324916

Abstract

The interaction of group A streptococcal lipoteichoic acid (LTA) with mammalian cell membranes was studied in human platelets. The binding of LTA to platelets was platelet concentration and time dependent. Binding approached a maximum within 10 min of incubation. The bound LTA could be displaced by adding a 50-fold excess of unlabeled LTA. An association constant of 1.9 X 10(-7) M was calculated, and only one population of binding sites was detected. Immuno-ferritin labeling of LTA-treated platelets demonstrated a patchy distribution of LTA binding sites on the platelet surface. LTA inhibited collagen- and alpha1 chain-induced platelet aggregation, but not the platelet release reaction, suggesting that the LTA and collagen binding sites on human platelets are distinct. Apparently, LTA binds to platelets and interferes with collagen-induced aggregation although collagen is still able to attach to binding sites to trigger the release reaction.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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