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Department of Pharmacology, Faculty of Medicine and Health Sciences, Erasmus University, NL-3000 DR Rotterdam, The Netherlands
Preconditioning the heart by brief coronary (CAO) or mesenteric artery occlusion (MAO) can protect against damage during subsequent prolonged CAO and reperfusion. The role of bradykinin (BK) in remote cardiac preconditioning by MAO is investigated by antagonizing the BK B2 receptor [Hoechst 140 (HOE-140)] or simulating local BK release by mesenteric intra-arterial infusion. Anesthetized male Wistar rats (n = 6-8) were treated with HOE-140 or saline before starting the preconditioning protocol, CAO, MAO, or non-preconditioned control. Infarct size related to risk area [ratio of infarct area to area at risk (IA/AR)] was determined after 3 h of reperfusion following a 60-min CAO. IA/AR was 62 ± 5% in controls and not affected by HOE-140 (58 ± 6%). CAO as well as MAO significantly protected the heart (IA/AR, 37 ± 3 and 35 ± 5%), which was prevented by HOE-140 (IA/AR, 71 ± 6 and 65 ± 7%, respectively). Brief intramesenteric BK infusion mimicked MAO (IA/AR, 26 ± 3%). Pretreatment with hexamethonium could abolish this protection (IA/AR, 67 ± 4%). These data indicate an important role for BK in remote preconditioning by MAO. Results support the hypothesis that remote preconditioning acts through sensory nerve stimulation in the ischemic organ.
sensory nerves; mesenteric vascular bed
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