Nuclear factor κB inhibitor BAY 11-7082 suppresses oxidative stress induced by endothelin-1 (ET-1) in rat kidney

Area of Science:

• Nephrology
• Pharmacology
• Molecular Biology

Background:

• Endothelin-1 (ET-1) is implicated in kidney injury.
• Oxidative stress and inflammation play key roles in the pathogenesis of kidney disease.
• Nuclear factor-kappa B (NF-κB) signaling is a critical mediator of inflammatory responses.

Purpose of the Study:

• To investigate the protective effects of BAY 11-7082, a specific NF-κB inhibitor, against ET-1-induced kidney damage.
• To evaluate the impact of BAY 11-7082 on oxidative stress markers and inflammatory mediators in rat kidneys.

Main Methods:

• Rats were treated with saline, ET-1 (at two doses), BAY 11-7082 alone, or BAY 11-7082 followed by ET-1.
• Kidney homogenates were analyzed for thiobarbituric acid reactive substances (TBARS), hydrogen peroxide (H2O2), TNF-α, p65 protein, and the GSH/GSSG ratio.
• NF-κB p65 protein levels were assessed in nuclear and cytoplasmic fractions.

Main Results:

• ET-1 administration increased TBARS and H2O2 levels, and decreased the GSH/GSSG ratio in a dose-dependent manner.
• Pre-treatment with BAY 11-7082 significantly reduced ET-1-induced TBARS and H2O2 levels and restored the GSH/GSSG ratio.
• BAY 11-7082 inhibited ET-1-induced TNF-α production and decreased NF-κB p65 nuclear translocation.

Conclusions:

• BAY 11-7082 demonstrates significant protective effects against ET-1-induced oxidative stress and inflammation in rat kidneys.
• These protective actions are likely mediated through the inhibition of NF-κB signaling pathways.
• Inhibiting the NF-κB pathway represents a potential therapeutic strategy for mitigating kidney damage.