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Enhanced gap junction expression in myoblast-containing engineered tissue.

ABSTRACT: Transplantation of skeletal myoblasts (SMs) has been investigated as a potential cardiac cell therapy approach. SM are available autologously, predetermined for muscular differentiation and resistant to ischemia. Major hurdles for their clinical application are limitations in purity and yield during cell isolation as well as the absence of gap junction expression after differentiation into myotubes. Furthermore, transplanted SMs do not functionally or electrically integrate with the host myocardium. Here, we describe an efficient method for isolating homogeneous SM populations from neonatal mice and demonstrate persistent gap junction expression in an engineered tissue. This method resulted in a yield of 1.4 × 10(8) high-purity SMs (>99% desmin positive) after 10 days in culture from 162.12 ± 11.85 mg muscle tissue. Serum starvation conditions efficiently induced differentiation into spontaneously contracting myotubes that coincided with loss of gap junction expression. For mechanical conditioning, cells were integrated into engineered tissue constructs. SMs within tissue constructs exhibited long term survival, ordered alignment, and a preserved ability to differentiate into contractile myotubes. When the tissue constructs were subjected to passive longitudinal tensile stress, the expression of gap junction and cell adherence proteins was maintained or increased throughout differentiation. Our studies demonstrate that mechanical loading of SMs may provide for improved electromechanical integration within the myocardium, which could lead to more therapeutic opportunities.

SUBMITTER: Srinivasan SP

PROVIDER: S-EPMC4346167 | biostudies-literature | 2012 Jun

REPOSITORIES: biostudies-literature

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Enhanced gap junction expression in myoblast-containing engineered tissue.

Srinivasan Sureshkumar Perumal SP Neef Klaus K Treskes Philipp P Liakopoulos Oliver J OJ Stamm Christof C Cowan Douglas B DB Madershahian Navid N Kuhn Elmar E Slottosch Ingo I Wittwer Thorsten T Wahlers Thorsten T Choi Yeong-Hoon YH

Biochemical and biophysical research communications 20120510 3

Transplantation of skeletal myoblasts (SMs) has been investigated as a potential cardiac cell therapy approach. SM are available autologously, predetermined for muscular differentiation and resistant to ischemia. Major hurdles for their clinical application are limitations in purity and yield during cell isolation as well as the absence of gap junction expression after differentiation into myotubes. Furthermore, transplanted SMs do not functionally or electrically integrate with the host myocard ...[more]

PMID: 22579687

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Enhanced gap junction expression in myoblast-containing engineered tissue.

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Enhanced gap junction expression in myoblast-containing engineered tissue.

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