PMID: 8580732Nov 1, 1995Paper

The cellular events of injured muscle regeneration depend on the nature of the injury

Neuromuscular Disorders : NMD
J P Lefaucheur, A Sébille

Abstract

The cellular events of muscle degeneration and regeneration and their time course were studied in two experimental models of muscle injury mice; (i) the denervation-devascularization (DD) of the extensor digitorum longus (EDL) muscle, which is an ischaemic lesion; (ii) the injection of notexin (NOT), a snake venom, in the tibialis anterior (TA) muscle, resulting in a toxic lesion. Compared to the ischaemic lesion, the toxic lesion was characterized by a more extensive inflammatory infiltrate and a shortened phase of phagocytosis of the damaged myofibres. This allowed the proliferation and differentiation of muscle precursor cells (mpc) to take place earlier and may be further promoted by growth factors released by inflammatory cells. Compared to DD-EDL, NOT-TA showed also a greater conservation of the basement membranes of the necrotic myofibres, that can support the fusion of mpc into myotubes, and a better microvascularization. The onset of muscle regeneration is tightly related to the events which occur during the phase of degeneration.

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