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Toll-like receptor 2 signaling triggers fatal arrhythmias upon myocardial ischemia-reperfusion.

Abstract：

OBJECTIVE:Restoration of myocardial blood flow after ischemia triggers an inflammatory response involving toll-like receptors. Toll-like receptor 2 deficiency is associated with a reduced infarct size after myocardial ischemia and reperfusion. Because a marked mortality was observed in C3HeN wild-type mice, which was absent in TLR2 mice, we tested whether cardiac arrhythmias are the underlying pathology and aimed to elucidate how toll-like receptor 2 ligation might prevent lethal arrhythmias. DESIGN:Experimental animal model. SETTING:University hospital research laboratory. SUBJECTS:Male C3HeN mice. INTERVENTIONS:Myocardial ischemia and reperfusion was surgically induced by ligation of the left anterior descending coronary artery for 20 mins followed by 24 hrs of reperfusion. Electrocardiography was continuously recorded during the observation period through an implantable telemetry transmitter to detect cardiac arrhythmias during reperfusion. MEASUREMENTS AND MAIN RESULTS:Toll-like receptor 2 expression was associated with a 51% mortality rate (23 of 45 mice died) after myocardial ischemia and reperfusion. Absence of toll-like receptor 2 improved survival toward 100% (17 of 17 mice survived). Electrocardiography diagnostics in conscious animals and histologic analysis revealed that absence of toll-like receptor 2 signaling prevented the formation of pathologic heart rate turbulence after myocardial ischemia and reperfusion and modulated the density of connexin 43-positive gap junctions in the ischemic area compared with wild-type hearts, indicating arrhythmia as the cause underlying the observed mortality. CONCLUSIONS:The results presented here indicate toll-like receptor 2 as a novel target for the prevention of lethal arrhythmic complications after myocardial ischemia and reperfusion.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Mersmann J,Koch A,Tran N,Zimmermann R,Granja TF,Larmann J,Herzog C,Theilmeier G,Bornstein SR,Kirschning CJ,Zacharowski K

doi

10.1097/CCM.0b013e3181ef455b

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

1927-32

issue

eissn

0090-3493

issn

1530-0293

pii

00003246-201010000-00001

journal_volume

pub_type

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Toll-like receptor 2 signaling triggers fatal arrhythmias upon myocardial ischemia-reperfusion.