Vascular function and arginine and dimethylarginines in gentamicin-induced renal failure: a possible effect of heme...

Area of Science:

• Nephrology
• Cardiovascular Science
• Pharmacology

Background:

• Renal disease is linked to oxidative stress and impaired nitric oxide bioavailability, causing endothelial dysfunction and cardiovascular issues.
• Gentamicin (GM), an antibiotic, can cause nephrotoxicity, necessitating protective strategies.
• Heme oxygenase 1 (HO-1) is a key enzyme in cellular defense against oxidative stress.

Purpose of the Study:

• To investigate the protective effects of HO-1 induction against gentamicin-induced nephrotoxicity and vascular dysfunction.
• To determine if hemin, an HO-1 inducer, can mitigate the adverse effects of gentamicin in rats.

Main Methods:

• Rats were administered gentamicin (GM) alone or with hemin for 14 days.
• Measurements included plasma and kidney levels of l-arginine, ADMA, SDMA, 4-HNE, and MPO activity.
• Kidney histopathology and aortic vascular responses (relaxation/contraction) were assessed.

Main Results:

• GM induced kidney damage, increased serum SDMA, BUN, and creatinine, and elevated kidney HO-1, 4-HNE, and MPO activity.
• GM decreased kidney antioxidant enzyme activity and l-arginine levels, leading to impaired aortic vascular function.
• Hemin treatment ameliorated GM-induced oxidative stress, inflammation, and vascular dysfunction, but did not alter SDMA, BUN, or creatinine.

Conclusions:

• HO-1 induction shows potential in counteracting gentamicin-induced renal oxidative stress, inflammation, and vascular dysfunction.
• Hemin-mediated HO-1 induction may be a viable therapeutic strategy for preventing antibiotic-induced kidney injury and associated vascular complications.