title: Acute preconditioning of cardiac progenitor cells with hydrogen peroxide enhances angiogenic pathways following ischemia-reperfusion injury.
abstract: There are a limited number of therapies available to prevent heart failure following myocardial infarction. One novel therapy that is currently being pursued is the implantation of cardiac progenitor cells (CPCs); however, their responses to oxidative stress during differentiation have yet to be elucidated. The objective of this study was to determine the effect of hydrogen peroxide (H2O2) treatment on CPC differentiation in vitro, as well as the effect of H2O2 preconditioning before implantation following ischemia-reperfusion (I/R) injury. CPCs were isolated and cloned from adult rat hearts, and then cultured in the absence or presence of H2O2 for 2 or 5 days. CPC survival was assessed with Annexin V, and cellular differentiation was evaluated through mRNA expression for cardiogenic genes. We found that 100 μM H2O2 decreased serum withdrawal-induced apoptosis by at least 45% following both 2 and 5 days of treatment. Moreover, 100 μM H2O2 treatment for 2 days significantly increased endothelial and smooth muscle markers compared to time-matched untreated CPCs. However, continued H2O2 treatment significantly decreased these markers. Left ventricular cardiac function was assessed 28 days after I/R and I/R with the implantation of Luciferase/GFP(+) CPCs, which were preconditioned with 100 μM H2O2 for 2 days. Hearts implanted with Luciferase/GFP(+) CPCs had significant improvement in both positive and negative dP/dT over I/R. Furthermore, cardiac fibrosis was significantly decreased in the preconditioned cells versus both I/R alone and I/R with control cells. We also observed a significant increase in endothelial cell density in the preconditioned CPC hearts compared to untreated CPC hearts, which also coincided with a higher density of Luciferase(+) vessels. These findings suggest that preconditioning of CPCs with H2O2 for 2 days stimulates neoangiogenesis in the peri-infarct area following I/R injury and could be a viable therapeutic option to prevent heart failure.
authors.affiliation: Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Emory University, Atlanta, Georgia 30322, USA.
authors.forename: Karl D
authors.initials: KD
authors.lastname: Pendergrass
authors.forename: Archana V
authors.initials: AV
authors.lastname: Boopathy
authors.forename: Gokulakrishnan
authors.initials: G
authors.lastname: Seshadri
authors.forename: Kathryn
authors.initials: K
authors.lastname: Maiellaro-Rafferty
authors.forename: Pao Lin
authors.initials: PL
authors.lastname: Che
authors.forename: Milton E
authors.initials: ME
authors.lastname: Brown
authors.forename: Michael E
authors.initials: ME
authors.lastname: Davis
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D005355:Fibrosis / Q000188:drug therapy; D015870:Gene Expression; D006333:Heart Failure / Q000188:drug therapy / Q000517:prevention & control*; D006861:Hydrogen Peroxide / Q000378:metabolism / Q000494:pharmacology*; D019157:Ischemic Preconditioning, Myocardial / Q000379:methods; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D009203:Myocardial Infarction / Q000188:drug therapy*; D018919:Neovascularization, Physiologic / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000188:drug therapy*; D013234:Stem Cells / Q000187:drug effects* / Q000378:metabolism; D016277:Ventricular Function, Left / Q000187:drug effects
chemical_list: D006861:Hydrogen Peroxide
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