Biology and Medicine

Abstract

Recovery of Skeletal Striated Muscle Tissue in a Model of Reversible Injury

Nicolas Salazar Otoya and Doris Haydee Rosero Salazar

Reversible injury is a dynamic condition in tissues exposed to multiple harm situations including ischemia and post-ischemic recovery, in which the skeletal striated muscle tissue evidences histopathological characteristics to adapt to damage. During the inflammation and the regeneration phases of healing, the myocytes show morphological changes with an apparently complete recovery at the end of the treatment. Though the satellite cells play a key role in the recovery, not in all cases the regeneration is completely achieved. That is why in this research we measured the histopathological patterns evidenced by enzyme histochemistry and morphometric measurements, during the spontaneous recovery of skeletal muscle fibers underwent to short periods of ischemia of one and three hours and prolonged periods of reperfusion up to 32 days (768 hours). The selected muscles were the extensor carpi radialis longus and the soleus from Wistar rats. There were significant differences in the distribution of type of fibers, shape, size, leukocyte infiltration, necrosis and presence of central nuclei. The soleus muscle adapts better during early reperfusion than extensor carpi radialis longus does. Nevertheless, both muscles evidenced an incomplete recovery at day 32. The extrapolation of these findings suggests the importance of further following up of patients and the improvement of recovery the muscle function after surgery and/or other harm conditions.