Expression of cardiac proteins in neonatal cardiomyocytes on PGS/fibrinogen core/shell substrate for Cardiac tissue engineering

Rajeswari Ravichandran, Jayarama Reddy Venugopal, Subramanian Sundarrajan, Shayanti Mukherjee, Radhakrishnan Sridhar, Seeram Ramakrishna

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Abstract

Background: Heart failure due to myocardial infarction remains the leading cause of death worldwide owing to the inability of myocardial tissue regeneration. The aim of this study is to develop a core/shell fibrous cardiac patch having desirable mechanical properties and biocompatibility to engineer the infarcted myocardium. Method: We fabricated poly(glycerol sebacate)/fibrinogen (PGS/fibrinogen) core/shell fibers with core as elastomeric PGS provides suitable mechanical properties comparable to that of native tissue and shell as fibrinogen to promote cell-biomaterial interactions. The PGS/fibrinogen core/shell fibers and fibrinogen nanofibers were characterized by SEM, contact angle and tensile testing to analyze the fiber morphology, wettability, and mechanical properties of the scaffold. The cell-scaffold interactions were analyzed using isolated neonatal cardiomyocytes for cell proliferation, confocal analysis for the expression of marker proteins α-actinin, Troponin-T, β-myosin heavy chain and connexin 43 and SEM analysis for cell morphology. Results: We observed PGS/fibrinogen core/shell fibers had a Young's modulus of about 3.28 ± 1.7 MPa, which was comparable to that of native myocardium. Neonatal cardiomyocytes cultured on these scaffolds showed normal expression of cardiac specific marker proteins α-actinin, Troponin, β-myosin heavy chain and connexin 43 to prove PGS/fibrinogen core/shell fibers have potential for cardiac tissue engineering. Conclusion: Results indicated that neonatal cardiomyocytes formed predominant gap junctions and expressed cardiac specific marker proteins on PGS/fibrinogen core/shell fibers compared to fibrinogen nanofibers, indicating PGS/fibrinogen core/shell fibers may serve as a suitable cardiac patch for the regeneration of infarcted myocardium.

Original languageEnglish
Pages (from-to)1461-1468
Number of pages8
JournalInternational Journal of Cardiology
Volume167
Issue number4
DOIs
Publication statusPublished - 20 Aug 2013
Externally publishedYes

Keywords

  • Cardiac tissue engineering
  • Cardiomyocytes
  • Core/shell fibers
  • Myocardial infarction

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