Tumor necrosis factor-α receptor 1 contributes to ethanol-induced vascular reactive oxygen species generation and...

We evaluated the contribution of tumor necrosis factor-α receptor 1 (TNFR1) to ethanol-induced hypertension and vascular oxidative stress and the possible role of perivascular adipose tissue (PVAT) in such responses. Male C57BL/6 wild-type (WT) or TNFR1-deficient mice (TNFR1^-/-) were treated with ethanol (20% vol/vol) for 12 weeks. Ethanol induced an increase in blood pressure in WT mice and TNFR1^-/- at 4 and 5 weeks of treatment, respectively. Treatment with ethanol increased tumor necrosis factor-α and interleukin-6 levels in aortas with or without PVAT (PVAT+ and PVAT-, respectively) from WT mice, but not TNFR1^-/-. Ethanol increased superoxide anion (O₂^-) generation, thiobarbituric acid reactive substance concentration, and the activity of superoxide dismutase and catalase in aortas (PVAT- and PVAT+) from WT mice, but not TNFR1^-/-. Conversely, ethanol consumption decreased the concentration of nitrate/nitrite in aortas (PVAT- and PVAT+) from WT mice, but not TNFR1^-/-. Treatment with ethanol increased myeloperoxidase activity in aortas (PVAT- and PVAT+) from WT mice, but not TNFR1^-/-. The major finding of our study is that TNFR1 contributes to ethanol-induced hypertension and oxidative stress in the vasculature. Additionally, TNFR1 plays a role in ethanol-induced increase in proinflammatory cytokines and neutrophils migration. However, PVAT does not counteract or aggravate the effects induced by ethanol.