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Morphological Changes in the Myotendinous Junction of mdx Mice. 2021

Giovana Zerbo Martinez, and Bruna Aléxia Cristofoletti Grillo, and Lara Caetano Rocha, and Carolina Dos Santos Jacob, and Jurandyr Pimentel Neto, and André Neri Tomiate, and Gabriela Klein Barbosa, and Ii-Sei Watanabe, and Adriano Polican Ciena
Laboratory of Morphology and Physical Activity (LAMAF), São Paulo State University (UNESP), Institute of Biosciences (IB), Avenue 24A, n. 1515, Rio Claro, SP 13506-900, Brazil.

The myotendinous junction (MTJ) is the interface between muscle and tendon, and it is the main area of force transmission of the locomotor apparatus. Dystrophic processes promote pathological injury which affects the skeletal muscle and can influence the morphology of the MTJ. This study aimed to investigate the adaptations in MTJ morphology of mdx mice in the tibialis anterior muscle. Male mice (n = 24) were divided into Control—C57bl/10 and mdx—C57bl/10mdx (Duchenne muscular dystrophy experimental model). In the mdx group, centralized nuclei with a large area and greater deposition of type III collagen (fibrosis) were observed. Also, shorter sarcomeres and sarcoplasmatic projections of MTJ were observed. We concluded that the adaptations in mdx mice demonstrated extensive impairment in the MTJ region with reduced ultrastructures.

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