(Circulation. 2006;113:1196-1202.)
© 2006 American Heart Association, Inc.
Heart Failure |
From the Medizinische Klinik und Poliklinik I, Universität Würzburg, Würzburg, Germany (M. Nahrendorf, K.H., S.F., P.N., S.G., W.R.B., G.E.); Center for Molecular Imaging Research, Massachusetts General Hospital, Harvard Medical School, Charlestown, Mass (M.N., F.A.J., C.T., D.S., R.W.); Physikalisches Institut (EP5), Universität Würzburg, Würzburg, Germany (K.H., S.V., P.J.); Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Charlestown, Mass (M. Novikov, A.R.); ZLB Behring, Marburg, Germany (G.D.); and Cardiology Division, Department of Medicine, Medical College of Georgia, Augusta (G.L.R.).
Correspondence to Dr Georg Ertl, Medizinische Universitätsklinik, Universität Würzburg, Josef Schneider-Strasse 2, 97080 Würzburg, Germany. E-mail Ertl_G{at}medizin.uni-wuerzburg.de
Received May 27, 2005; de novo received November 16, 2005; revision received December 16, 2005; accepted December 23, 2005.
Background Identification of key molecular players in myocardial healing could lead to improved therapies, reduction of scar formation, and heart failure after myocardial infarction (MI). We hypothesized that clotting factor XIII (FXIII), a transglutaminase involved in wound healing, may play an important role in MI given prior clinical and mouse model data.
Methods and Results To determine whether a truly causative relationship existed between FXIII activity and myocardial healing, we prospectively studied myocardial repair in FXIII-deficient mice. All FXIII/ and FXIII/+ (FXIII activity <5% and 70%) mice died within 5 days after MI from left ventricular rupture. In contradistinction, FXIII/ mice that received 5 days of intravenous FXIII replacement therapy had normal survival rates; however, cardiac MRI demonstrated worse left ventricular remodeling in these reconstituted FXIII/ mice. Using a FXIII-sensitive molecular imaging agent, we found significantly greater FXIII activity in wild-type mice and FXIII/ mice receiving supplemental FXIII than in FXIII/ mice (P<0.05). In FXIII/ but not in reconstituted FXIII/ mice, histology revealed diminished neutrophil migration into the MI. Reverse transcriptasepolymerase chain reaction studies suggested that the impaired inflammatory response in FXIII/ mice was independent of intercellular adhesion molecule and lipopolysaccharide-induced CXC chemokine, both important for cell migration. After MI, expression of matrix metalloproteinase-9 was 650% higher and collagen-1 was 53% lower in FXIII/ mice, establishing an imbalance in extracellular matrix turnover and providing a possible mechanism for the observed cardiac rupture in the FXIII/ mice.
Conclusions These data suggest that FXIII has an important role in murine myocardial healing after infarction.
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