1,721,027 research outputs found
INFLUENCE OF BREEDING SYSTEMS ON PH AND HISTOCHEMICAL PROPERTIES OF MUSCLE-FIBERS IN PORCINE MUSCULUS-SEMIMEMBRANOSUS
No full textThe characteristic fibre-type composition and fast myosin present in the striated oesophageal muscle of the carnivores
No full textThe fibre type composition of the striated muscle of the oesophagus in ruminants and carnivores
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Tertiary myotubes in postnatal growing pig muscle detected by their myosin isoform composition
No full textThe natural involution of the sheep proximal sesamoidean ligament is due to depletion of satellite cells and simultaneous proliferation of fibroblasts: Ultrastructural evidence
No full textThe rapid involution that happens in some muscles of ungulate fetlock joints has never been investigated at an ultrastructural level. In this study, the proximal sesamoidean ligament (PSL) of sheep was chosen as a model to investigate, at the cellular level, the transition from muscle to connective structures that occurs during early development. In particular, we were interested in observing the presence of satellite cells and fibroblasts, detecting fluctuations in their numbers in the postnatal developing PSL, and evaluating putative apoptotic mechanisms. Interestingly, some features were shared by both PSL involution and muscle ageing; the most relevant being the significant and rapid decrease in the number of satellite cells together with a quick proliferation of fibroblasts in the muscle-connective transitional area (MCT-TA). Electron microscopy and immunohistochemical analyses revealed putative cellular mechanisms that led to a progressive involution of the muscle portion of the PSL during postnatal growth. Our findings showed a fast transition from muscle to connective tissue due to the depletion of satellite cells, apoptosis of some muscle fibres, and simultaneous proliferation of fibroblasts originating from mesenchymal progenitors or from differentiation of satellite cells typically located at the border between muscle and connective tissue of the PSL
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