Simonato, Enea (2008) Studio in vitro e in vivo di cellule mesenchimali da sangue cordonale e cellule satellite da fibre muscolari scheletriche nella rigenerazione muscolare. [Ph.D. thesis]
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Previous works showed that muscle substitutes composed by acellular matrix and myoblasts may represent a promising approach for the treatment of diseases characterized by congenital absence or loss of large areas of skeletal muscle tissue. Here, the regeneration process occurring in vivo within the prosthetic material has been studied verifying the expression, as mRNA and protein, of some skeletal muscle and nerve tissue markers during three month after reconstructive surgery. The experimental evidences indicate that a progressive muscle remodelling within the implants exists and it is not completed after three months. Indeed, the simultaneous presence of markers belonging to both early and late differentiative stages indicates the presence of activated progenitors towards the myogenic line and cellular elements of advanced stages. Moreover, the involving of circulating precursors, probably of marrow origin, in the regeneration process it is suggested by the following observations: i) persistence of poorly differentiated cells at 3 months after surgery, ii) important cell migration from vessels without inflammatory phenomena, and iii) implanted myoblasts, that are cells already committed toward a specific fate, presumably form multinucleated elements in a short time. Finally, there is a rapid appearence of both vascular network and the nervous component. Although these promising results, in view of medical application a problem arise when the function of muscle satellite cells is impaired or their number inside the muscle fibers is low. To overcome this problem, this research has been addressed to the identification of alternative cell sources.
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