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Glomerular actions of nitric oxide

L Raij, C Baylis

    Kidney International
    |July 1, 1995
    PubMed
    Summary

    Nitric oxide (NO) regulates kidney function, influencing blood pressure and glomerular filtration. Insufficient NO causes kidney damage and hypertension, while increased NO may be involved in diabetes and pregnancy hemodynamics.

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    Area of Science:

    • Biochemistry
    • Physiology
    • Nephrology

    Background:

    • Nitric oxide (NO), synthesized from L-arginine, is crucial for cellular processes.
    • NO's short half-life necessitates localized and concentration-dependent biological effects.
    • Different NO synthases (NOS) produce varying NO quantities, impacting distinct physiological roles.

    Discussion:

    • Endothelial NOS (cNOS) in the kidney regulates glomerular microcirculation by affecting arteriole tone and mesangial cells.
    • Macula densa and afferent arteriole-derived NO modulate glomerular hemodynamics via tubuloglomerular feedback (TGF) and renin release.
    • NO is vital for regulating glomerular capillary pressure, plasma flow, and ultrafiltration coefficient.

    Key Insights:

    • Chronic NO deficiency leads to hypertension and glomerular damage, potentially causing salt-dependent hypertension.
    • Elevated NO production is implicated in the hemodynamic changes of diabetes and normal pregnancy.
    • NO inhibits platelet aggregation and adhesion, maintaining endothelial antithrombogenic properties.

    Outlook:

    • Excessive NO during glomerular inflammation can cause kidney injury.
    • Further understanding of NO's renal physiology and pathophysiology can inform new therapeutic strategies.

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