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Related Experiment Videos

Modulation of platelet activation by native DNA.

B A Fiedel, J S Schoenberger, H Gewurz

    Journal of Immunology (Baltimore, Md. : 1950)
    |December 1, 1979
    PubMed
    Summary

    Native double-stranded DNA (dsDNA) activates human platelets, but also inhibits collagen- or thrombin-induced aggregation in plasma. This suggests dsDNA plays a dual role in platelet function.

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    Area of Science:

    • Biochemistry
    • Hematology
    • Molecular Biology

    Background:

    • Platelets are crucial for hemostasis and thrombosis.
    • DNA can be released extracellularly during tissue damage or inflammation.
    • The role of extracellular DNA in modulating platelet function is not fully understood.

    Purpose of the Study:

    • To investigate the effects of native double-stranded DNA (dsDNA) on human platelet aggregation and activation.
    • To determine if dsDNA modulates platelet responses to other agonists.
    • To explore the potential mechanisms underlying dsDNA's effects on platelets.

    Main Methods:

    • Isolated human platelet aggregation assays.
    • Measurement of serotonin (5HT) release from platelets.
    • Platelet activation studies in plasma and cell-free systems.
    • Comparison of dsDNA with RNA and single-stranded DNA.

    Main Results:

    • Native dsDNA induced platelet aggregation and serotonin release, an effect inhibited by theophylline and TYA.
    • Non-aggregating concentrations of dsDNA inhibited collagen- or thrombin-induced platelet activation, but not ADP- or epinephrine-induced aggregation.
    • dsDNA's ability to activate platelets was lost in plasma, but its inhibitory effect on collagen/thrombin-induced aggregation was retained.
    • RNA and single-stranded DNA did not induce aggregation or inhibit dsDNA-mediated activation.

    Conclusions:

    • Double-stranded DNA acts as a selective activator of human platelets.
    • dsDNA can also selectively inhibit platelet aggregation induced by collagen and thrombin, particularly in a plasma environment.
    • These findings suggest a complex, dual role for dsDNA in regulating platelet responsiveness.

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