Dong Fan1, Abhijit Takawale1, Mengcheng Shen1, Wang Wang1, Xiuhua Wang1, Ratnadeep Basu1, Gavin Y Oudit1, Zamaneh Kassiri2. 1. From the Department of Physiology (D.F., A.T., M.S., X.W., Z.K.), Division of Cardiology, Department of Medicine (W.W., R.B., G.Y.O.), Cardiovascular Research Center (D.F., A.T., M.S., X.W., Z.K., W.W., R.B.), Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada. 2. From the Department of Physiology (D.F., A.T., M.S., X.W., Z.K.), Division of Cardiology, Department of Medicine (W.W., R.B., G.Y.O.), Cardiovascular Research Center (D.F., A.T., M.S., X.W., Z.K., W.W., R.B.), Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada. z.kassiri@ualberta.ca.
Abstract
BACKGROUND: A disintegrin and metalloproteinase 17 (ADAM17) is a membrane-bound enzyme that mediates shedding of many membrane-bound molecules, thereby regulating multiple cellular responses. We investigated the role of cardiomyocyte ADAM17 in myocardial infarction (MI). METHODS AND RESULTS: Cardiomyocyte-specific ADAM17 knockdown mice (ADAM17(flox/flox)/α-MHC-Cre; f/f/Cre) and parallel controls (ADAM17(flox/flox); f/f) were subjected to MI by ligation of the left anterior descending artery. Post MI, f/f/Cre mice showed compromised survival, higher rates of cardiac rupture, more severe left ventricular dilation, and suppressed ejection fraction compared with parallel f/f-MI mice. Ex vivo ischemic injury (isolated hearts) resulted in comparable recovery in both genotypes. Myocardial vascular density (fluorescent-labeled lectin perfusion and CD31 immunofluorescence staining) was significantly lower in the infarct areas of f/f/Cre-MI compared with f/f-MI mice. Activation of vascular endothelial growth factor receptor 2 (VEGFR2), its mRNA, and total protein levels were reduced in infarcted myocardium in ADAM17 knockdown mice. Transcriptional regulation of VEGFR2 by ADAM17 was confirmed in cocultured cardiomyocyte-fibroblast as ischemia-induced VEGFR2 expression was blocked by ADAM17-siRNA. Meanwhile, ADAM17-siRNA did not alter VEGFA bioavailability in the conditioned media. ADAM17 knockdown mice (f/f/Cre-MI) exhibited reduced nuclear factor-κB activation (DNA binding) in the infarcted myocardium, which could underlie the suppressed VEGFR2 expression in these hearts. Post MI, inflammatory response was not altered by ADAM17 downregulation. CONCLUSIONS: This study highlights the key role of cardiomyocyte ADAM17 in post-MI recovery by regulating VEGFR2 transcription and angiogenesis, thereby limiting left ventricular dilation and dysfunction. Therefore, ADAM17 upregulation, within the physiological range, could provide protective effects in ischemic cardiomyopathy.
BACKGROUND:A disintegrin and metalloproteinase 17 (ADAM17) is a membrane-bound enzyme that mediates shedding of many membrane-bound molecules, thereby regulating multiple cellular responses. We investigated the role of cardiomyocyte ADAM17 in myocardial infarction (MI). METHODS AND RESULTS: Cardiomyocyte-specific ADAM17 knockdown mice (ADAM17(flox/flox)/α-MHC-Cre; f/f/Cre) and parallel controls (ADAM17(flox/flox); f/f) were subjected to MI by ligation of the left anterior descending artery. Post MI, f/f/Cre mice showed compromised survival, higher rates of cardiac rupture, more severe left ventricular dilation, and suppressed ejection fraction compared with parallel f/f-MI mice. Ex vivo ischemic injury (isolated hearts) resulted in comparable recovery in both genotypes. Myocardial vascular density (fluorescent-labeled lectin perfusion and CD31 immunofluorescence staining) was significantly lower in the infarct areas of f/f/Cre-MI compared with f/f-MI mice. Activation of vascular endothelial growth factor receptor 2 (VEGFR2), its mRNA, and total protein levels were reduced in infarcted myocardium in ADAM17 knockdown mice. Transcriptional regulation of VEGFR2 by ADAM17 was confirmed in cocultured cardiomyocyte-fibroblast as ischemia-induced VEGFR2 expression was blocked by ADAM17-siRNA. Meanwhile, ADAM17-siRNA did not alter VEGFA bioavailability in the conditioned media. ADAM17 knockdown mice (f/f/Cre-MI) exhibited reduced nuclear factor-κB activation (DNA binding) in the infarcted myocardium, which could underlie the suppressed VEGFR2 expression in these hearts. Post MI, inflammatory response was not altered by ADAM17 downregulation. CONCLUSIONS: This study highlights the key role of cardiomyocyte ADAM17 in post-MI recovery by regulating VEGFR2 transcription and angiogenesis, thereby limiting left ventricular dilation and dysfunction. Therefore, ADAM17 upregulation, within the physiological range, could provide protective effects in ischemic cardiomyopathy.
Authors: Franka Scharfenberg; Andreas Helbig; Martin Sammel; Julia Benzel; Uwe Schlomann; Florian Peters; Rielana Wichert; Maximilian Bettendorff; Dirk Schmidt-Arras; Stefan Rose-John; Catherine Moali; Stefan F Lichtenthaler; Claus U Pietrzik; Jörg W Bartsch; Andreas Tholey; Christoph Becker-Pauly Journal: Cell Mol Life Sci Date: 2019-06-17 Impact factor: 9.261
Authors: Jacob J Russell; Laurel A Grisanti; Scott M Brown; Chastidy A Bailey; Shawn B Bender; B Chandrasekar Journal: Cell Signal Date: 2021-03-27 Impact factor: 4.850