Vagal stimulation suppresses ischemia-induced myocardial interstitial myoglobin release

Life Sciences
T KawadaM Sugimachi

Abstract

To evaluate vagal stimulation-mediated myocardial protection against ischemia and reperfusion in in vivo ischemic myocardium. We measured myocardial interstitial myoglobin levels in the ischemic region using a cardiac microdialysis technique in anesthetized and vagotomized cats. We occluded the left anterior descending coronary artery (LAD) for 60 min and reperfused it for 60 min (VX group, n = 6). The effects of bilateral vagal stimulation (10 V, 5 Hz, 1-ms pulse duration), initiated immediately after LAD occlusion, were examined (VS group, n = 6). To examine the involvement of phosphatidylinositol 3-kinase (PI3K), vagal stimulation was performed after pretreatment with a PI3K inhibitor wortmannin (0.6 mg/kg, i.v.) (VS-W group, n = 6). To examine the contribution of bradycardia, vagal stimulation was performed with fixed-rate ventricular pacing (VS-P group, n = 6). The average myoglobin level during the ischemic period was 1170+/-141 in VX (in ng/ml, mean+/-SE), which was significantly attenuated in VS (466+/-87, P<0.05) and VS-W (613+/-124, P<0.05) but not in VS-P (953+/-203). Reperfusion increased the myoglobin level to 2500+/-544 in VX, whereas it was suppressed in VS (824+/-213, P<0.05) and VS-W (948+/-315, P<0.05) but not...Continue Reading

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Citations

Jul 25, 2012·Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.]·Qiang WangJian-Hua Liu
Oct 22, 2010·Apoptosis : an International Journal on Programmed Cell Death·Jin-Jun LiuWei-Jin Zang
Nov 15, 2011·Clinical and Experimental Pharmacology & Physiology·Mei ZhaoWei-Jin Zang
Oct 9, 2014·Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.]·Qiang WangXu Liao
Apr 26, 2012·Frontiers in Neuroendocrinology·Daniela GiulianiSalvatore Guarini
Oct 19, 2010·The Journal of Surgical Research·Maohua WangZhengyuan Xia
Jul 31, 2010·Journal of Cardiac Failure·Kazunori UemuraMasaru Sugimachi
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Aug 29, 2019·Scandinavian Cardiovascular Journal : SCJ·Yuko IshikawaToji Yamazaki
Mar 17, 2016·Anesthesiology·Benjamin E SteinbergPeder S Olofsson

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