Loss of dystrophin and some dystrophin-associated proteins with concomitant signs of apoptosis in rat leg muscle overworked in extension

Donatella Biral, A. Jakubiec-Puka, Iwona Ciechomska, Marco Sandri, Katia Rossini, Ugo Carraro, Romeo Betto

Research output: Contribution to journalArticle

Abstract

This study investigated the basis for the high severity of damage to skeletal muscle due to eccentric exercise, i.e., to muscles generating force while lengthened. Fast and slow rat leg muscles maintained in an extended position were examined after 2-24 h of continuous stimulation. The treatment caused the injury to some regions of both muscles. Within the better preserved parts of the muscles, i.e., those without signs of necrotic processes, dystrophin, spectrin, and some of the dystrophin-associated proteins (β-dystroglycan, α-sarcoglycan, and γ-sarcoglycan) disappeared from sarcolemma of many fibers. The reduction or loss of dystrophin from the sarcolemma was more evident than that of other proteins examined, with sarcoglycans apparently being the most preserved. Several muscle fibers devoid of dystrophin contained apoptotic nuclei. Simultaneously, Bax, Bcl-2 and caspase-3 proteins appeared in many fibers. Our results indicate that a normal muscle overworking in an extended position undergoes the loss of several membrane skeletal proteins because of the excessive stress to the membrane cyto-skeleton, which can lead to fiber death by either apoptosis or necrosis. This experimental model may represent a good model for mimicking the pathogenetic events in several muscular dystrophies.

Original languageEnglish
Pages (from-to)618-626
Number of pages9
JournalActa Neuropathologica
Volume100
Issue number6
DOIs
Publication statusPublished - 2000

Keywords

  • Apoptosis
  • Dystrophin
  • Dystrophin-associated proteins
  • Eccentric exercise
  • Skeletal muscle

ASJC Scopus subject areas

  • Clinical Neurology
  • Pathology and Forensic Medicine
  • Neuroscience(all)

Fingerprint Dive into the research topics of 'Loss of dystrophin and some dystrophin-associated proteins with concomitant signs of apoptosis in rat leg muscle overworked in extension'. Together they form a unique fingerprint.

  • Cite this