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Nitric oxide, sepsis, and the kidney
1Tel Aviv Souraski Medical Center, Israel.
Seminars in Nephrology
|May 5, 1999
Summary
Selective inhibition of inducible nitric oxide synthase (iNOS) preserves kidney function during sepsis. This approach prevents decreases in glomerular filtration rate (GFR) by protecting endothelial nitric oxide synthase (eNOS) activity, unlike nonselective inhibitors.
Area of Science:
- Nephrology
- Pharmacology
- Critical Care Medicine
Background:
- Sepsis-induced hypotension is linked to excess nitric oxide (NO) production.
- Kidney NO generation is crucial for renal perfusion and preventing glomerular thrombosis during sepsis.
Purpose of the Study:
- To investigate the differential effects of nitric oxide synthase (NOS) inhibition on kidney function in a sepsis model.
- To determine the role of endothelial NOS (eNOS) and inducible NOS (iNOS) in sepsis-induced kidney injury.
Main Methods:
- Administered lipopolysaccharide (LPS) to rats to induce sepsis.
- Utilized selective iNOS inhibitors and nonselective NOS inhibitors.
- Measured glomerular filtration rate (GFR) and glomerular eNOS activity.
Main Results:
- All NOS inhibitors normalized blood pressure, but only selective iNOS inhibition preserved GFR.
- LPS administration inhibited glomerular eNOS activity, which was prevented by selective iNOS inhibition.
- Adverse renal outcomes correlated with decreased eNOS activity, not elevated NO production.
Conclusions:
- Decreased GFR in sepsis may result from iNOS-mediated inhibition of eNOS activity.
- Selective iNOS inhibition offers a superior therapeutic strategy for sepsis-related kidney dysfunction compared to nonselective NOS inhibition.