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Conditions influencing platelet lysis.

R L Kinlough-Rathbone, Chahil AMAR, M A Packham

    Laboratory Investigation; a Journal of Technical Methods and Pathology
    |March 1, 1975
    PubMed
    Summary

    Platelet lysis, a process where platelets break down, is closely linked to their granule release reaction. This lysis requires the release reaction to occur and can be inhibited by specific conditions, suggesting a complex interplay during thrombus formation.

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    Area of Science:

    • Hematology
    • Cell Biology
    • Biochemistry

    Background:

    • Platelets play a crucial role in hemostasis and thrombosis.
    • In vivo studies suggest platelets can release granule contents and undergo lysis during thrombus formation.
    • The relationship between platelet release and lysis requires further in vitro investigation.

    Purpose of the Study:

    • To investigate the relationship between platelet release reaction and platelet lysis in vitro.
    • To determine the conditions influencing platelet lysis induced by thrombin and collagen.

    Main Methods:

    • Washed platelets from rabbits, pigs, and humans were used.
    • Platelet release was quantified by measuring 14C-serotonin and adenine nucleotides in the supernatant.
    • Platelet lysis was assessed by quantifying lactate dehydrogenase and 14C-ATP released into the supernatant.
    • Platelets were preincubated with metabolic inhibitors to deplete ATP.

    Main Results:

    • Thrombin induced both release and lysis in platelets, with rabbit platelets showing significantly greater lysis than pig or human platelets.
    • Platelet lysis was dependent on the release reaction; inhibiting release reduced lysis.
    • The fall in platelet ATP levels did not directly cause lysis.
    • Platelet lysis was inhibited by calcium deprivation, prostaglandin E(1) addition, or increased albumin concentration.

    Conclusions:

    • Platelet lysis is a consequence of the platelet release reaction, not a preceding event.
    • The release reaction is a prerequisite for thrombin- or collagen-induced platelet lysis.
    • Specific conditions can modulate platelet lysis, highlighting regulatory mechanisms in platelet activation and death.

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