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Composite poly(lactic acid)/chitosan nanofibrous scaffolds for cardiac tissue engineering.
International Journal of Biological Macromolecules 2017 October
Fibrous scaffolds with different ratios of poly (lactic acid) (PLA) and chitosan were fabricated by conventional electrospinning. After crosslinking by the glutaraldehyde vapor, the structure, mechanical properties, hydrophilicity, and in-fiber chemical interactions of the scaffolds were investigated. We found that the fiber diameter decreased with the concentration of chitosan, while mechanical properties and hydrophilicity improved. In addition, we found that scaffolds with aligned fibers have higher mechanical strength and biocompatibility than scaffolds with randomly oriented fibers. In particular, scaffolds with aligned fibers with PLA:chitosan ratios of 7:1 was found to support cardiomyocyte viability, elicit cell elongation, and enhance production of sarcomeric α-actinin and troponin I. Collectively, the data indicate that composite scaffolds consisting of PLA/chitosan fibers have great potential for engineering cardiac tissue, and for accelerating the regeneration of myocardia.
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