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- W2051574006 abstract "Please cite this paper as: Berwick, Payne, Lynch, Dick, Sturek and Tune (2010). Contribution of Adenosine A2A and A2B Receptors to Ischemic Coronary Dilation: Role of KV and KATP Channels. Microcirculation17(8), 600–607. Abstract This study was designed to elucidate the contribution of adenosine A2A and A2B receptors to coronary reactive hyperemia and downstream K+ channels involved. Coronary blood flow was measured in open-chest anesthetized dogs. Adenosine dose-dependently increased coronary flow from 0.72 ± 0.1 to 2.6 ± 0.5 mL/minute/g under control conditions. Inhibition of A2A receptors with SCH58261 (1 μm) attenuated adenosine-induced dilation by ∼50%, while combined administration with the A2B receptor antagonist alloxazine (3 μm) produced no additional effect. SCH58261 significantly reduced reactive hyperemia in response to a transient 15 second occlusion; debt/repayment ratio decreased from 343 ± 63 to 232 ± 44%. Alloxazine alone attenuated adenosine-induced increases in coronary blood flow by ∼30% but failed to alter reactive hyperemia. A2A receptor agonist CGS21680 (10 μg bolus) increased coronary blood flow by 3.08 ± 0.31 mL/minute/g. This dilator response was attenuated to 0.76 ± 0.14 mL/minute/g by inhibition of KV channels with 4-aminopyridine (0.3 mm) and to 0.11 ± 0.31 mL/minute/g by inhibition of KATP channels with glibenclamide (3 mg/kg). Combined administration abolished vasodilation to CGS21680. These data indicate that A2A receptors contribute to coronary vasodilation in response to cardiac ischemia via activation of KV and KATP channels." @default.
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- W2051574006 date "2010-11-01" @default.
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- W2051574006 title "Contribution of Adenosine A2A and A2B Receptors to Ischemic Coronary Dilation: Role of KV and KATP Channels" @default.
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- W2051574006 doi "https://doi.org/10.1111/j.1549-8719.2010.00054.x" @default.
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