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ACS Nano. 2017 Dec 26;11(12):11954-11968. doi: 10.1021/acsnano.7b00186. Epub 2017 Nov 28.

Harnessing Sphingosine-1-Phosphate Signaling and Nanotopographical Cues To Regulate Skeletal Muscle Maturation and Vascularization.

Author information

1
Department of Anatomy, Faculty of Dentistry, Mahidol University , Bangkok 73170, Thailand.
2
Department of Clinical Investigation, Madigan Army Medical Center , Tacoma, Washington 98431, United States.
3
Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University , Cheonan, South Korea.
4
Department of Pathology, Albert Einstein College of Medicine , Bronx, New York 10467, United States.
5
Department of Chemistry and the Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology , Daejeon, South Korea.

Abstract

Despite possessing substantial regenerative capacity, skeletal muscle can suffer from loss of function due to catastrophic traumatic injury or degenerative disease. In such cases, engineered tissue grafts hold the potential to restore function and improve patient quality of life. Requirements for successful integration of engineered tissue grafts with the host musculature include cell alignment that mimics host tissue architecture and directional functionality, as well as vascularization to ensure tissue survival. Here, we have developed biomimetic nanopatterned poly(lactic-co-glycolic acid) substrates conjugated with sphingosine-1-phosphate (S1P), a potent angiogenic and myogenic factor, to enhance myoblast and endothelial maturation. Primary muscle cells cultured on these functionalized S1P nanopatterned substrates developed a highly aligned and elongated morphology and exhibited higher expression levels of myosin heavy chain, in addition to genes characteristic of mature skeletal muscle. We also found that S1P enhanced angiogenic potential in these cultures, as evidenced by elevated expression of endothelial-related genes. Computational analyses of live-cell videos showed a significantly improved functionality of tissues cultured on S1P-functionalized nanopatterns as indicated by greater myotube contraction displacements and velocities. In summary, our study demonstrates that biomimetic nanotopography and S1P can be combined to synergistically regulate the maturation and vascularization of engineered skeletal muscles.

KEYWORDS:

nanotopography; skeletal muscle; sphingosine-1-phosphate; tissue engineering; vascularization

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