engleski

Hyperbaric oxygenation modulates vascular reactivity to angiotensin-(1-7) in diabetic rats - potential role of epoxyeicosatrienoic acids

Previously, a facilitating effect of hperbaric oxygenation (HBO2) on aortic ring responses to angiotensin-(1-7) in healthy rats was reported, with epoxyeicosatrienoic acids (EETs) possibly playing an important role. The aim of this study was to assess whether HBO2 exerts similar effects in diabetic rats and to further explore the role of specific cytochrome P450 (CYP) enzymes in changes induced by HBO2. Aortic relaxation to angiotensin-(1-7) wassignificantly higher in HBO2 diabetic rats compared to control diabetic rats, while HBO2 had no effect on angiotensin II contraction. MS-PPOHinhibited the facilitation of angiotensin-(1-7) responses in HBO2 rats, suggesting an important role of EETs in this modulation. mRNA expression of CYP2J3 and protein expression of CYP2C11 was significantly upregulated in HBO2 diabetic rats, whereas CYP4A1, CYP4A2 and CYP4A3 mRNA and CYP2J3 protein expression was similar between groups. Mean arterial pressure, FRAP and TBARS levels and serum angiotensin-(1-7) concentrations were not significantly changed.

hyperbaric oxygen therapy; angiotensin II; angiotensin-(1-7); epoxyeicosatrienoic acids

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