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• W2031072064 abstract "To clarify the roles of subclasses of alpha 1-adrenoreceptors in ischemic-reperfused myocardium, we compared the effect of the nonselective alpha 1-blocker bunazosin with that of the alpha 1A-blocker WB4101 and the alpha 1B-blocker chlorethylclonidine (CEC) in isolated rat hearts. After 30 min of preperfusion, Langendorff-perfused hearts were subjected to 25 min of global ischemia followed by 30 min of reperfusion. Hearts were randomly divided into 4 groups, with one of the following substances being added to the perfusate: buffer alone (control), 10(-6) mol/L bunazosin, 10(-7) mol/L WB4101, or 10(-7) mol/L CEC. Bunazosin had a negative inotropic effect and preserved the postischemic ATP content, reduced the postischemic increase in intracellular Na+ content and then enhanced postreperfusion recovery of creatine phosphate. Bunazosin also reduced myocardial 45Ca2+ uptake during reperfusion (control 5.2 vs bunazosin 2.5 mumol/g dry weight of tissue (dwt), p < 0.01). However, the recovery of left ventricular developed pressure (DP) was not improved when bunazosin was added to the perfusate during reperfusion. WB4101 had neither a negative inotropic nor an energy-sparing effect, but it improved the recovery of DP (control 43% vs WB4101 56% of preischemic value, p < 0.05) with no reduction in myocardial 45Ca2+ uptake. CEC had a negative inotropic and energy-sparing effect and then reduced myocardial 45Ca2+ uptake (CEC 3.1 mumol/g dwt, p < 0.05), but it did not improve the recovery of DP. These results suggest that the preischemic administration of an alpha 1B-adrenoreceptor subtype blocker protected ischemic-reperfused myocardium via reduction of Ca2+ overload, whereas the selective blockade of the alpha 1A-adrenoreceptor subtype reduced myocardial damage via mechanism(s) other than Ca2+ metabolism." @default.
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• W2031072064 date "1997-01-01" @default.
• W2031072064 modified "2023-09-23" @default.
• W2031072064 title "Effects of α₁-Adrenoreceptor Subtype Blockade on Ischemia-Reperfusion Injury" @default.
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• W2031072064 doi "https://doi.org/10.1253/jcj.61.927" @default.
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