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dc.contributor.authorQian, Lingen
dc.contributor.authorShim, Winstonen
dc.contributor.authorGu, Yacuien
dc.contributor.authorShirhan, Mohameden
dc.contributor.authorLim, Kee Pahen
dc.contributor.authorTan, Lay Pohen
dc.contributor.authorLim, Chong Heeen
dc.contributor.authorSin, Yoong Kongen
dc.contributor.authorWong, Philipen
dc.identifier.citationQian, L., Shim, W., Gu, Y., Shirhan, M., Lim, K. P., Tan, L. P., et al. (2012). Hemodynamic contribution of stem cell scaffolding in acute injured myocardium. Tissue Engineering Part A, 18(15-16), 1652-1663.en
dc.description.abstractTissue-engineered scaffolds may improve experimental outcomes in cardiac cell therapy by targeted delivery of stem cells and mechanically support an infarcted left ventricular (LV) wall. We transplanted cardiomyocyte-like cells (5×105) with scaffolding via epicardial patching (cell patch, n=17) or a low-dose intramyocardial hydrogel (LD hydrogel, n=18), a high-dose (5×106) intramyocardial hydrogel (HD hydrogel, n=18) or transplanting a serum-free medium control (control, n=13), a blank patch (n=14), and a blank gel (n=16) for targeted cardiomyoplasty in a myocardial infarcted rat model. LV real-time hemodynamics were assessed using a 1.9-F pressure–volume catheter 7 weeks after stem cell transplantation. All mode of scaffold transplantation protected diastolic function by preserving LV wall integrity that resulted in a lower end diastolic pressure–volume relationship (EDPVR) as compared to a control medium-injected group. Moreover, epicardial patching, but not hydrogel injection, reduced ventricular wall stress with a significantly better LV end diastolic pressure (EDP: 5.3±2.4 mmHg vs. 9.6±6.9 mmHg, p<0.05) as compared to control. Furthermore, epicardial patching additionally preserved systolic function by modulating negative remodeling through restricting dilatation of the LV chamber. In comparison to control, an improved ejection fraction in the cell patch group (80.1%±5.9% vs. 67.9%±3.2%, p<0.01) was corroborated by load-independent enhancement of the end systolic pressure–volume relationship (ESPVR: 0.88±0.61 mmHg/uL vs. 0.29±0.19 mmHg/uL, p<0.05) and preload recruitable stroke work (PRSW: 68.7±26.4 mmHg vs. 15.6±16.2 mmHg, p<0.05) in systolic function. Moreover, the cell patch group (14.2±1.7 cells/high-power field vs. 7.4±1.6 cells/high power field, p<0.05) was significantly better in myocardial retention of transplanted stem cells as compared to the LD hydrogel group. Collectively, myocardial transplantation of compliant scaffolding materials alone may physically improve wall mechanics, largely independent of stem cells. However, epicardially grafted cell patch conferred added systolic contractility by improving stem cell retention and cellular alignment leading to improved LV remodeling and geometric preservation postinfarction.en
dc.relation.ispartofseriesTissue Engineering Part Aen
dc.rights© 2012 Mary Ann Liebert. This paper was published in Tissue Engineering - Part A and is made available as an electronic reprint (preprint) with permission of Mary Ann Liebert. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.en
dc.titleHemodynamic contribution of stem cell scaffolding in acute injured myocardiumen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science & Engineeringen
dc.description.versionPublished Versionen
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