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Racial differences in erythrocyte cation transport.

A B Weder, B A Torretti, S Julius

    Hypertension (Dallas, Tex. : 1979)
    |January 1, 1984
    PubMed
    Summary

    Sodium-lithium countertransport is higher in white hypertensives than normotensives, but not in Black individuals. These erythrocyte transport differences may explain racial disparities in blood pressure regulation.

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    Journal of human hypertension·2013

    Area of Science:

    • Physiology
    • Genetics
    • Biochemistry

    Background:

    • Hypertension exhibits complex pathophysiology with potential genetic and environmental influences.
    • Racial differences in blood pressure regulation, particularly between White and Black populations, are well-documented.
    • Erythrocyte cation transport systems are implicated in blood pressure control and may vary across racial groups.

    Purpose of the Study:

    • To investigate racial differences in erythrocyte cation transport pathways in normotensive and hypertensive individuals.
    • To explore the relationship between erythrocyte transport function and blood pressure in White and Black subjects.
    • To identify potential cellular mechanisms underlying racial disparities in sodium handling and hypertension.

    Main Methods:

    • Measurement of erythrocyte contents and ouabain-insensitive transport pathways.
    • Assessment of sodium-stimulated lithium-sodium countertransport rate.
    • Quantification of passive lithium efflux and furosemide-sensitive sodium and potassium effluxes.
    • Analysis of correlations between transport parameters and blood pressure in White and Black participants.

    Main Results:

    • Higher maximal sodium-stimulated lithium-sodium countertransport rate in White hypertensives compared to White normotensives, with a positive correlation to mean arterial pressure.
    • Similar countertransport values in Black normotensives and hypertensives, with no significant correlation to blood pressure.
    • Increased passive lithium efflux rate in Whites compared to Blacks, independent of blood pressure or sex.
    • No alterations in ouabain-insensitive, furosemide-sensitive sodium and potassium effluxes in hypertension.
    • Lower furosemide-sensitive sodium efflux rate in Blacks, but not similarly depressed potassium efflux.
    • Strong correlation between sodium and potassium effluxes in Whites, absent in Blacks.

    Conclusions:

    • Erythrocyte sodium-lithium countertransport is elevated in White hypertensives but not in Black hypertensives, suggesting a potential role in racial differences in hypertension.
    • Passive lithium efflux differs between racial groups, independent of blood pressure.
    • Furosemide-sensitive sodium efflux is reduced in Blacks, indicating potential racial variations in specific ion transport mechanisms.
    • Observed differences in erythrocyte sodium and potassium handling between White and Black individuals warrant further investigation into the pathogenesis of racial disparities in total body sodium regulation and hypertension.

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