TY - JOUR
T1 - Hyperbaric oxygenation modulates vascular reactivity to angiotensin-(1-7) in diabetic rats
T2 - Potential role of epoxyeicosatrienoic acids
AU - Kibel, Aleksandar
AU - Novak, Sanja
AU - Cosic, Anita
AU - Mihaljevic, Zrinka
AU - Falck, J R
AU - Drenjancevic, Ines
N1 - Publisher Copyright:
© The Author(s) 2014.
PY - 2015/1/16
Y1 - 2015/1/16
N2 - Previously, a facilitating effect of hyperbaric 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) was significantly higher in HBO2 diabetic rats compared to control diabetic rats, while HBO2 had no effect on angiotensin II contraction. N-methylsulphonyl-6-(2-propargyloxyphenyl/hexanamide inhibited 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 were significantly upregulated in HBO2 diabetic rats, whereas CYP4A1, CYP4A2 and CYP4A3 mRNA and CYP2J3 protein expression was similar between groups. Mean arterial pressure, ferric reducing ability of plasma and Thiobarbituric Acid Reactive Substances levels and serum angiotensin-(1-7) concentrations were not significantly changed.
AB - Previously, a facilitating effect of hyperbaric 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) was significantly higher in HBO2 diabetic rats compared to control diabetic rats, while HBO2 had no effect on angiotensin II contraction. N-methylsulphonyl-6-(2-propargyloxyphenyl/hexanamide inhibited 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 were significantly upregulated in HBO2 diabetic rats, whereas CYP4A1, CYP4A2 and CYP4A3 mRNA and CYP2J3 protein expression was similar between groups. Mean arterial pressure, ferric reducing ability of plasma and Thiobarbituric Acid Reactive Substances levels and serum angiotensin-(1-7) concentrations were not significantly changed.
KW - Hyperbaric oxygen therapy
KW - angiotensin II
KW - angiotensin-(1-7)
KW - epoxyeicosatrienoic acids
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U2 - 10.1177/1479164114553424
DO - 10.1177/1479164114553424
M3 - Article
C2 - 25326234
AN - SCOPUS:84916908601
SN - 1479-1641
VL - 12
SP - 33
EP - 45
JO - Diabetes and Vascular Disease Research
JF - Diabetes and Vascular Disease Research
IS - 1
ER -