Optical mapping of cryoinjured rat myocardium grafted with mesenchymal stem cells

Title

Optical mapping of cryoinjured rat myocardium grafted with mesenchymal stem cells

Creator

Costa A R; Panda N C; Yong S; Mayorga M E; Pawlowski G P; Fan K K; Penn M S; Laurita K R

Publisher

American Journal of Physiology-Heart and Circulatory Physiology

Date

2012
2012-01

Description

Costa AR, Panda NC, Yong S, Mayorga ME, Pawlowski GP, Fan K, Penn MS, Laurita KR. Optical mapping of cryoinjured rat myocardium grafted with mesenchymal stem cells. Am J Physiol Heart Circ Physiol 302: H270-H277, 2012. First published October 28, 2011; doi: 10.1152/ajpheart.00019.2011.-Mesenchymal stem cells (MSCs) have been shown to improve cardiac electrophysiology when administered in the setting of acute myocardial infarction. However, the electrophysiological phenotype of MSCs in situ is not clear. We hypothesize that MSCs delivered intramyocardially to cryoinjured myocardium can engraft, but will not actively generate, action potentials. Cryoinjury-induced scar was created on the left ventricular epicardial surface of adult rat hearts. Within 30 min, hearts were injected with saline (sham, n = 11) or bone marrow-derived MSCs (2 x 10(6)) labeled with 1,1'-dioctadecyl-3,3,3,3'-tetramethyl-indocarbocyanine percholate (DiI; n = 16). At 3 wk, optical mapping and cell isolation were used to measure optical action potentials and calcium transients, respectively. Histological analysis confirmed subepicardial scar thickness and the presence of DiI-positive cells that express connexin-43. Optical action potential amplitude within the scar at MSC-positive sites (53.8 +/- 14.3%) was larger compared with sites devoid of MSCs (35.3 +/- 14.2%, P < 0.05) and sites within the scar of shams (33.5 +/- 6.9%, P < 0.05). Evidence of simultaneous action potential upstroke, the loss of action potential activity following ablation of adjacent viable myocardium, and no rapid calcium transient response in isolated DiI + cells suggest that the electrophysiological influence of engrafted MSCs is electrotonic. MSCs can engraft when directly injected into a cryoinjury and are associated with evidence of action potential activity. However, our results suggest that this activity is not due to generation of action potentials, but rather passive influence coupled from neighboring viable myocardium.

Subject

cardiomyocytes; Myocardial infarction; therapy; Physiology; Cardiovascular System & Cardiology; in-vitro; repair; Transplantation; phenotype; regeneration; infarction; heart; stem cell; action potential; pacemakers

Format

Journal Article or Conference Abstract Publication

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Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

H270-H277

Issue

1

Volume

302

Citation

Costa A R; Panda N C; Yong S; Mayorga M E; Pawlowski G P; Fan K K; Penn M S; Laurita K R, “Optical mapping of cryoinjured rat myocardium grafted with mesenchymal stem cells,” NEOMED Bibliography Database, accessed November 30, 2021, https://neomed.omeka.net/items/show/8976.

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