Spinal and bulbar muscular atrophy: Skeletal muscle pathology in male patients and heterozygous females

Gianni Sorarù, Carla D'Ascenzo, Alberto Polo, Arianna Palmieri, Linda Baggio, Lodovica Vergani, Cinzia Gellera, Giuseppe Moretto, Elena Pegoraro, Corrado Angelini

Research output: Contribution to journalArticlepeer-review


Spinal and bulbar muscular atrophy (SBMA) is an adult form of X-linked motor neuron disease caused by an expansion of a CAG repeat sequence in the first exon of the androgen receptor (AR) gene. Nuclear accumulation of mutant AR with expanded polyglutamines in motor neurons is a major pathogenic mechanism. To characterize muscle involvement in SBMA the skeletal muscle biopsies of 8 SBMA patients and 3 female carriers were studied. Six of 8 SBMA patients showed myogenic changes together with the neurogenic atrophy in their muscle biopsy. Myopathic abnormalities did not correlate with disease duration and were more prominent in the muscle of patients with an higher degree of disability. In all patients plasma CK levels were more elevated than what usually occurs in denervative diseases. Both neurogenic and myopathic changes were also observed in female carriers. Here we suggest that myopathic changes in SBMA muscle are not only related to denervation and that muscle satellite cells may have a role in the pathogenesis of muscle damage.

Original languageEnglish
Pages (from-to)100-105
Number of pages6
JournalJournal of the Neurological Sciences
Issue number1-2
Publication statusPublished - Jan 15 2008


  • Denervation
  • Myogenic changes
  • Satellite cells
  • SBMA
  • Skeletal muscle

ASJC Scopus subject areas

  • Ageing
  • Clinical Neurology
  • Surgery
  • Developmental Neuroscience
  • Neurology
  • Neuroscience(all)

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