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Platelets reduce coronary microvascular permeability to macromolecules.

P F McDonagh

    The American Journal of Physiology
    |September 1, 1986
    PubMed
    Summary
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    Platelets play a crucial role in maintaining coronary microvascular integrity. Studies show that perfusing rat hearts with platelet-rich plasma significantly reduced macromolecule leakage, highlighting platelets' importance in vessel permeability.

    Area of Science:

    • Cardiovascular Physiology
    • Hemodynamics
    • Microcirculation Research

    Background:

    • Platelets are implicated in maintaining microvascular integrity in various organs.
    • Previous research indicated blood cells reduce coronary microvascular permeability, but the specific cell type contribution was unclear.

    Purpose of the Study:

    • To investigate the specific role of platelets in maintaining coronary microvascular integrity.
    • To differentiate the effect of platelets from red blood cells on coronary permeability.

    Main Methods:

    • Isolated rat hearts were perfused with Krebs-albumin perfusate supplemented with either platelet-rich plasma (PRP) or platelet-poor plasma (PPP).
    • Coronary microvascular permeability was assessed by measuring transcoronary extravasation of fluorescent albumin (FITC-BSA) using intravital fluorescence microscopy.

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  • Permeability was quantified using the optical-to-injection ratio (O/I).

    • Main Results:

    • Hearts perfused with PRP exhibited significantly lower FITC-BSA extravasation (O/I ratio of 0.47 +/- 0.02) compared to those perfused with PPP (O/I ratio of 0.57 +/- 0.02).
    • The reduced permeability observed with PRP was comparable to previous findings using red blood cell perfusates.
    • A significant difference (P < 0.05) was noted between PRP and PPP groups.

    Conclusions:

    • Platelets contribute to maintaining the normal semipermeable characteristics of coronary exchange vessels.
    • These findings support the role of platelets in regulating coronary microvascular permeability.
    • Platelets are essential for preserving the integrity of the heart's microvasculature.