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Volume-regulating behavior of human platelets.

A Livne, S Grinstein, A Rothstein

    Journal of Cellular Physiology
    |June 1, 1987
    PubMed
    Summary
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    Human platelets rapidly shrink after swelling in hypotonic solutions through regulatory volume decrease (RVD). This process involves KCl loss via ion channels, influenced by intracellular pH and Na+/H+ exchange.

    Area of Science:

    • Cell biology
    • Physiology
    • Biochemistry

    Background:

    • Human platelets exhibit regulatory volume decrease (RVD) when exposed to hypotonic media.
    • RVD is a critical cellular process for maintaining osmotic balance.
    • Previous studies have explored RVD in various cell types, but platelet-specific mechanisms require further elucidation.

    Purpose of the Study:

    • To investigate the mechanisms and kinetics of regulatory volume decrease (RVD) in human platelets.
    • To identify the ion transport pathways involved in platelet volume regulation.
    • To explore the role of intracellular pH and Na+/H+ exchange in RVD.

    Main Methods:

    • Human platelets were subjected to hypotonic stress.
    • Cell volume changes were monitored using electronic sizing and turbidimetry.

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  • Ion transport was assessed by manipulating extracellular ion concentrations and using specific inhibitors.

    • Main Results:

    • Platelets swelled significantly in hypotonic media without lysis and initiated rapid RVD within minutes.
    • RVD was mediated by the conductive loss of KCl through volume-activated K+ and anion pathways.
    • Inhibition of Na+/H+ exchange or replacement of Na+ enhanced RVD, while cytoplasmic acidification activated Na+/H+ exchange, reducing shrinking.

    Conclusions:

    • Platelet RVD is a rapid, ion transport-dependent process primarily involving KCl efflux.
    • The interplay between K+/anion channels and Na+/H+ exchange significantly regulates platelet volume.
    • Understanding these mechanisms is crucial for comprehending platelet function in various physiological and pathological conditions.