Abstract
Previously, we reported that the coronary reactive hyperemic response (CRH) was reduced in adenosine A2A receptor-null (A2AAR-/-) mice, and reversed by soluble epoxide hydrolase (sEH) inhibitor. However, this is unknown in aortic vascular response; therefore, we hypothesized that A2AAR-gene deletion in mice (A2AAR-/-) affects adenosine-induced vascular response by increasing sEH and adenosine A1 receptor (A1AR) activities. A2AAR-/- mice showed an increase in sEH, AI AR and CYP450-4A protein expression but decrease in CYP450-2C compared to C57Bl/6 mice. NECA (adenosine-analog) and CCPA (adenosine A1 receptor-agonist)-induced dose-dependent vascular response was tested with t-AUCB (sEH-inhibitor) and angiotensin-II (Ang-II) in A2AAR-/- vs. C57Bl/6 mice. In A2AAR-/-, NECA and CCPA-induced increase in dose-dependent vasoconstriction compared to C57Bl/6 mice. However, NECA and CCPA-induced dose-dependent vascular contraction in A2AAR-/- was reduced by t-AUCB with NECA. Similarly, dose-dependent vascular contraction in A2AAR-/- was reduced by t-AUCB with CCPA. In addition, Ang-II enhanced NECA and CCPA-induced dose-dependent vascular contraction in A2AAR-/- with NECA. Similarly, the dose-dependent vascular contraction in A2AAR-/- was also enhanced by Ang-II with CCPA. Furthermore, t-AUCB reduced Ang-II-enhanced NECA and CCPA-induced dose-dependent vascular contraction in A2AAR-/-mice. Our data suggest that the dose-dependent vascular contraction in A2AAR-/- mice depends on increase in sEH, A1AR and CYP4A protein expression.
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