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Microtopographical effects of natural scaffolding on cardiomyocyte function and arrhythmogenesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
2265 107 2010 6 PDF Available
Title
Microtopographical effects of natural scaffolding on cardiomyocyte function and arrhythmogenesis
Abstract

A natural myocardial patch for heart regeneration derived from porcine urinary bladder matrix (UBM) was previously reported to outperform synthetic materials (Dacron and expanded polytetrafluoroethylene (ePTFE)) used in current surgical treatments. UBM, an extracellular matrix prepared from urinary bladder, has intricate three-dimensional architecture with two distinct sides: the luminal side with a smoother surface relief; and the abluminal side with a fine mesh of nano- and microfibers. This study tested the ability of this natural scaffold to support functional cardiomyocyte networks, and probed how the local microtopography and composition of the two sides affects cell function. Cardiomyocytes isolated from neonatal rats were seeded in vitro to form cardiac tissue onto luminal (L) or abluminal (Ab) UBM. Immunocytochemistry of contractile cardiac proteins demonstrated growth of cardiomyocyte networks with mature morphology on either side of UBM, but greater cell compactness was seen in L. Fluorescence-based imaging techniques were used to measure dynamic changes in intracellular calcium concentration upon electrical stimulation of L and Ab-grown cells. Functional differences in cardiac tissue grown on the two sides manifested themselves in faster calcium recovery (p < 0.04) and greater hysteresis (difference in response to increasing and decreasing pacing rates) for L vs Ab side (p < 0.03). These results suggest that surface differences may be leveraged to engineer the desired cardiomyocyte responses and highlight the potential of natural scaffolds for fostering heart repair.

Keywords
Urinary bladder matrix; Scaffolding; Cardiomyocytes; Topography; Electrical stability
First Page Preview
Microtopographical effects of natural scaffolding on cardiomyocyte function and arrhythmogenesis
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 6, Issue 8, August 2010, Pages 3029–3034
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering