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Brain sodium uptake after choroid plexectomy.

K G Go, L Koster-Otte, J J Pratt

    Brain Research
    |July 13, 1979
    PubMed
    Summary
    This summary is machine-generated.

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    Brain sodium uptake in rats correlates with blood pressure. Choroid plexus removal reduced this uptake, suggesting its role in cerebrospinal fluid secretion.

    Area of Science:

    • Neuroscience
    • Physiology
    • Renal Physiology

    Background:

    • Brain sodium uptake (BSU) is influenced by various physiological factors.
    • The choroid plexus plays a critical role in cerebrospinal fluid (CSF) production.
    • Understanding the relationship between blood pressure and brain sodium dynamics is essential.

    Purpose of the Study:

    • To investigate the relationship between arterial blood pressure and brain sodium uptake in rats.
    • To determine the contribution of the choroid plexus to blood pressure-independent brain sodium uptake.
    • To elucidate the role of the choroid plexus in cerebrospinal fluid secretion.

    Main Methods:

    • Rats were injected with radioactive sodium isotopes ([24Na] and [22Na]).
    • Brain and blood radioactivities were measured post-mortem to calculate BSU.

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  • BSU was plotted against average arterial blood pressure.
  • Choroid plexuses were surgically removed in experimental groups; sham operations were performed in controls.

    • Main Results:

    • A linear dependence of BSU on blood pressure was observed in control rats.
    • Choroid plexus removal resulted in a significantly lower intercept, indicating reduced blood pressure-independent BSU.
    • Sham operations did not alter the relationship between BSU and blood pressure compared to controls.

    Conclusions:

    • The blood pressure-independent component of BSU is largely attributed to choroid plexus activity.
    • These findings strongly suggest that choroid plexus secretion contributes significantly to cerebrospinal fluid production.
    • The choroid plexus is a key determinant of brain sodium homeostasis, independent of blood pressure fluctuations.