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Bioengineering a Miniaturized In Vitro 3D Myotube Contraction Monitoring Chip For Modelization of Muscular Dystrophies

Rose, N.; Sonam, S.; Nguyen, T.; Grenci, G.; Bigot, A.; Muchir, A.; Ladoux, B.; Le Grand, F.; Trichet, L.

2021-06-15 bioengineering
10.1101/2021.06.15.448543 bioRxiv
Show abstract

Quantification of skeletal muscle functional contraction is essential to assess the outcomes of therapeutic procedures for muscular disorders. Muscle three-dimensional "Organ-on-chip" models usually require a substantial amount of biological material, which is problematic in the context of limited patient sample. Here we developed a miniaturized 3D myotube culture chip with contraction monitoring capacity. Optimized micropatterned substrate design enabled to obtain high culture yields in tightly controlled microenvironments. Spontaneous contractions in myotubes derived from primary human myoblasts were observed. Analysis of nuclear morphology confirmed a similar organization between obtained myotubes and in vivo myofibers. LMNA-related Congenital Muscular Dystrophy (L-CMD) was modelled with successful development of mutant 3D myotubes displaying contractile dysfunction. This technology can thus be used to study contraction characteristics and evaluate how diseases affect muscle organization and force generation. Importantly, it requires significantly fewer starting materials than current systems, which should allow to substantially improve drug screening capability.

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