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Related Experiment Videos

Renin release from the ischaemic kidney.

J S Long, W B Severs

    British Journal of Pharmacology
    |May 1, 1973
    PubMed
    Summary

    Spinal cord transection inhibits the blood pressure response to kidney ischemia, suggesting the nervous system regulates blood flow for renin release, not renin secretion itself.

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    Area of Science:

    • Physiology
    • Renal Physiology
    • Neuroscience

    Background:

    • The renin-angiotensin-aldosterone system plays a crucial role in blood pressure regulation.
    • The precise mechanisms controlling renin release, particularly the involvement of the nervous system, remain incompletely understood.

    Purpose of the Study:

    • To investigate the role of the nervous system in the pressor response following renal ischemia and subsequent renin release.
    • To differentiate between neural control of renin secretion and neural influence on renal blood flow.

    Main Methods:

    • Surgical interventions including spinal cord transection and pithing in rats.
    • Pharmacological blockade of the sympathetic nervous system.
    • Constant flow perfusion of the ischemic kidney.

    Main Results:

    • Spinal section and pithing significantly inhibited the pressor response to renal ischemia.
    • Transection of the brain at bulbar and midthalamic levels did not affect the pressor response.
    • Pharmacological antagonists of the sympathetic nervous system did not alter the blood pressure response.
    • Constant flow perfusion in spinal-sectioned rats still elicited a pressor response.

    Conclusions:

    • The nervous system is not directly required for renin release from juxtaglomerular cells.
    • Neural pathways appear essential for maintaining adequate renal blood flow, facilitating renin 'washout' into the circulation.
    • These findings suggest a regulatory role for the nervous system in blood pressure control via hemodynamic modulation rather than direct renin secretion stimulation.

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