What question did this study set out to answer?

To determine whether the renal effects of nitric oxide synthase inhibition are direct or dependent on renal perfusion pressure, and to evaluate how endogenous nitric oxide participates in renal adaptation to elevated dietary salt.

February 1, 1993Journal of Clinical InvestigationOpen Access

Adaptation to increased dietary salt intake in the rat. Role of endogenous nitric oxide.

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Why the study?

Does endogenous nitric oxide modulate renal hemodynamics and sodium handling in response to increased dietary salt intake in rats?

Population

Rats (control and chronically salt-loaded)

Comparison

Intrarenal arterial infusion of NO synthase… vs Control rats and basal renal perfusion pressure…

Design

Preclinical

Follow-up

2 weeks

Authors

PSP J ShultzUniversity of Minnesota JTJ P TolinsUniversity of Minnesota

Discussion

Member takes

Implication

NO may buffer renal hemodynamics during high salt intake in rats; leaves open translation to human salt sensitivity or hypertension management.

Key Points

To determine whether the renal effects of nitric oxide synthase inhibition are direct or dependent on renal perfusion pressure, and to evaluate how endogenous nitric oxide participates in renal adaptation to elevated dietary salt.
Administered intrarenal arterial infusions of the nitric oxide synthase inhibitor L-NMMA to control rats, with and without maintaining basal renal perfusion pressure via a suprarenal aortic snare.
Maintained rats on a high-salt diet (1% NaCl drinking water) for 2 weeks to assess serum and urinary nitric oxide decomposition products (NO2 + NO3) alongside renal hemodynamic responses to L-NMMA.
L-NMMA infusion decreased glomerular filtration rate and caused renal vasoconstriction regardless of perfusion pressure, but reduced sodium excretion and prevented proteinuria only when renal perfusion pressure was held at basal levels.
Chronic high salt intake significantly elevated serum concentrations and urinary excretion of NO2 + NO3, which correlated with urinary sodium excretion and enhanced renal hemodynamic responsiveness to nitric oxide synthase inhibition.

Structured PICO

Does endogenous nitric oxide modulate renal hemodynamics and sodium handling in response to increased dietary salt intake in rats?

Population

Rats (control and chronically salt-loaded)

Intervention

Intrarenal arterial infusion of NO synthase inhibitor NG-monomethyl-L-arginine (L-NMMA) and/or high salt intake (1% NaCl drinking water for 2 weeks)

Comparator

Control rats (normal salt intake) and basal renal perfusion pressure conditions

Outcome

Renal hemodynamics (glomerular filtration rate, renal vasoconstriction) and sodium handling (natriuresis, proteinuria, sodium excretion)surrogate

Endogenous nitric oxide directly modulates renal hemodynamics and sodium handling, facilitating sodium excretion and potentially maintaining normal blood pressure during increased dietary salt intake.

Cite This Study

Shultz et al. (1993) studied this question.

synapsesocial.com/papers/6a79689d684c0941cf321139 https://doi.org/10.1172/jci116244

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Implication

NO may buffer renal hemodynamics during high salt intake in rats; leaves open translation to human salt sensitivity or hypertension management.

Adaptation to increased dietary salt intake in the rat. Role of endogenous nitric oxide.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Adaptation to increased dietary salt intake in the rat. Role of endogenous nitric oxide.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Also Consider