Left ventricular dilation in toll-like receptor 2 deficient mice after myocardial ischemia/reperfusion through defective scar formation
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Jan Mersmann Katharina Habeck Kathrina Latsch Rene´ Zimmermann Christoph Jacoby Jens W. Fischer Christian Hartmann Ju¨rgen Schrader Ca
- چاپ و سال / کشور: 2011
Description
Restoration of myocardial blood flow after ischemia triggers an inflammatory response involving tolllike receptors (TLRs). TLR2-/--mice show short-term advantages upon reperfusion injury as compared with WT controls. Accordingly, it has been shown that transient TLR2-blockade prior to reperfusion is associated with improved left-ventricular performance after myocardial scar formation. We present here adverse myocardial remodeling due to a chronic lack of TLR2 expression. Myocardial ischemia/reperfusion (MI/R) was surgically induced in C3HeN-mice by ligation of the left anterior descending coronary artery for 20 min, followed by 24 h or 28 days of reperfusion. TLR2-/--mice and TLR2-Ab treated (T2.5) WT-mice displayed a reduction of infarct size, plasma troponin T concentrations, and leukocyte infiltration as compared with untreated controls after 24 h of reperfusion. After 28 days, however, magnetic resonance imaging revealed a marked left ventricular dilation in TLR2-/--animals, which was associated with pronounced matrix remodeling characterized by reduced collagen and decorin density in the infarct scar. Our data show adverse effects on myocardial remodeling in TLR2-/--mice. Although interception with TLR2 signaling is a promising concept for the prevention of reperfusion injury after myocardial ischemia, these data give cause for serious concern with respect to the time-point and duration of the potential treatment
Basic Res Cardiol (2011) 106:89–98 Received: 31 May 2010 / Revised: 23 September 2010 / Accepted: 6 October 2010 / Published online: 22 October 2010
