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Platelet prostacyclin binding in smokers.

K Jaschonek, H Weisenberger, S Tidow

    The Journal of Laboratory and Clinical Medicine
    |August 1, 1986
    PubMed
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    Smokers show varied platelet prostacyclin receptor binding. Some smokers have increased binding, others decreased, impacting PGI2

    Area of Science:

    • Cardiovascular Research
    • Pharmacology
    • Platelet Biology

    Background:

    • Platelet prostacyclin (PGI2) receptors play a role in cardiovascular health.
    • Smoking is known to affect various physiological processes, including platelet function.

    Purpose of the Study:

    • To investigate alterations in platelet prostacyclin receptor binding capacity (Bmax) and affinity (KD) in male smokers compared to nonsmokers.
    • To assess the impact of these alterations on PGI2's inhibitory effect on adenosine diphosphate (ADP)-induced platelet aggregation.

    Main Methods:

    • Direct binding studies were used to determine Bmax and KD of platelet PGI2 receptors.
    • Inhibitory effect of PGI2 (IC50) on ADP-induced platelet aggregation was measured.
    • Discriminant analysis was employed to differentiate between smoker subgroups.

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    Main Results:

    • 69% of smokers exhibited significantly different Bmax and KD values.
    • 12 smokers showed increased Bmax (+74%) and decreased affinity (KD +94%).
    • Four smokers displayed reduced Bmax (-65%) with a diminished antiaggregatory effect (IC50 +74%).

    Conclusions:

    • Smokers represent a heterogeneous population regarding platelet PGI2 receptor binding and responsiveness.
    • While some smokers show increased PGI2 binding, there's no evidence of a biologically relevant upregulation with enhanced postreceptor response.
    • Findings suggest complex interactions between smoking, PGI2 signaling, and platelet aggregation.