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Plasma catecholamines in human and experimental hypertension

I J Kopin, R McCarty, I Yamaguchi

    Clinical and Experimental Hypertension
    |January 1, 1980
    PubMed
    Summary

    Spontaneously hypertensive rats exhibit normal norepinephrine levels but heightened stress reactivity. Abnormalities in central stress response and peripheral catecholamine sensitivity contribute to their elevated blood pressure.

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    Area of Science:

    • Physiology
    • Cardiovascular Research
    • Neuroscience

    Background:

    • Plasma norepinephrine (NE) levels indicate sympathetic nerve release rates.
    • Spontaneously hypertensive (SHR) rats and humans with hypertension show normal basal plasma NE.
    • SHR rats display exaggerated responses to stress compared to WKY controls.

    Purpose of the Study:

    • To investigate the mechanisms underlying elevated blood pressure in SHR rats.
    • To compare sympathetic NE release and blood pressure responses in SHR and WKY rats.
    • To identify factors contributing to hypertension in SHR, including stress reactivity and catecholamine sensitivity.

    Main Methods:

    • Comparison of basal plasma NE levels in SHR and WKY rats.
    • Assessment of NE release during sympathetic stimulation in pithed SHR and WKY rats.
    • Evaluation of blood pressure responses to stress and sympathetic stimulation.

    Main Results:

    • Basal plasma NE levels were comparable between SHR and WKY rats.
    • NE release during sympathetic stimulation was similar in pithed SHR and WKY rats.
    • SHR rats exhibited greater blood pressure increases in response to stress and stimulation.
    • Diminished beta-adrenoceptor-mediated vasodilation (young SHR) and arteriolar structural changes (older SHR) were implicated.

    Conclusions:

    • Elevated blood pressure in SHR rats results from both central stress response abnormalities and peripheral catecholamine sensitivity issues.
    • These dual abnormalities contribute to the development and maintenance of hypertension in SHR.
    • Findings highlight the complex interplay of central and peripheral factors in hypertensive mechanisms.

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