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Thromb Haemost 1981; 45(03): 263-266
DOI: 10.1055/s-0038-1650184
Original Article
Schattauer GmbH Stuttgart

Modulation of Platelet Activation by Native DNA – Initial Description of Platelet Receptor Type, Number and Discrimination for Native DNA

B A Fiedel
The Department of Immunology, Rush University, Chicago, Illinois, USA
,
M E Frenzke
The Department of Immunology, Rush University, Chicago, Illinois, USA
› Author Affiliations
Further Information

Publication History

Received 02 July 1980

Accepted 06 November 1980

Publication Date:
06 July 2018 (online)

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Summary

Native DNA (dsDNA) induces the aggregation of isolated human platelets. Using isotopically labeled dsDNA (125I-dsDNA) and Scatchard analysis, a single class of platelet receptor was detected with a KD = 190 pM and numbering ~275/platelet. This receptor was discriminatory in that heat denatured dsDNA, poly A, poly C, poly C · I and poly C · poly I failed to substantially inhibit either the platelet binding of, or platelet aggregation induced by, dsDNA; by themselves, these polynucleotides were ineffective as platelet agonists. However, poly G, poly I and poly G · I effectively and competitively inhibited platelet binding of the radioligand, independently activated the platelet and when used at a sub-activating concentration decreased the extent of dsDNA stimulated platelet aggregation. These data depict a receptor on human platelets for dsDNA and perhaps certain additional polynucleotides and relate receptor-ligand interactions to a physiologic platelet function.

Keywords

Native DNA - Platelet - Platelet aggregation - Polynucleotide - Receptor-ligand interactions
 

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