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Catecholamine-induced polyploidization in vascular smooth muscle cells.

Y Yamori, M Mano, Y Nara

    Circulation
    |January 1, 1987
    PubMed
    Summary

    Norepinephrine and epinephrine can induce polyploidy, or cells with multiple sets of chromosomes, in vascular smooth muscle cells. This occurs independently of any significant changes in blood pressure, suggesting a direct cellular effect.

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    Area of Science:

    • Cardiovascular Biology
    • Cell Biology
    • Pharmacology

    Background:

    • Vascular smooth muscle cells (VSMCs) play a critical role in regulating blood pressure and vascular tone.
    • Understanding factors that influence VSMC proliferation and genetic stability is crucial for cardiovascular health.
    • Polyploidy, an increase in chromosome sets, can alter cell function and has been implicated in various disease states.

    Purpose of the Study:

    • To investigate the potential of catecholamines, specifically norepinephrine and epinephrine, to induce polyploidy in VSMCs.
    • To determine if catecholamine-induced polyploidy in VSMCs is associated with changes in blood pressure.
    • To compare the effects of norepinephrine on VSMCs from normotensive and spontaneously hypertensive rat models.

    Main Methods:

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  • In vivo study: Intravenous infusion of norepinephrine or epinephrine in Wistar-Crea rats for 12 days using osmotic minipumps.
  • In vitro study: Exposure of cultured VSMCs from Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR) to varying concentrations of norepinephrine.
  • Flow cytometry or similar methods were used to assess the frequency of polyploidy (tetraploidy and octaploidy) in VSMCs.

    • Main Results:

    • Both norepinephrine and epinephrine significantly increased the frequency of tetraploidy in VSMCs in vivo compared to saline controls.
    • In vitro, norepinephrine exposure (10(-6)M) increased the frequency of tetraploidy and octaploidy in SHR-derived VSMCs.
    • Norepinephrine infusion in vivo caused a slight increase in blood pressure, while epinephrine did not.
    • Catecholamine-induced polyploidy in VSMCs occurred independently of significant blood pressure elevation.

    Conclusions:

    • Norepinephrine and epinephrine can directly induce polyploidy in vascular smooth muscle cells.
    • The induction of VSMC polyploidy by these catecholamines is not dependent on elevated blood pressure.
    • These findings suggest a novel mechanism by which catecholamines may influence vascular cell biology, potentially impacting cardiovascular disease pathogenesis.