Spinal and bulbar muscular atrophy: skeletal muscle pathology in male patients and heterozygous females.
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.
Sorarù
Gianni
G
Department of Neurological Sciences, University of Padova, Italy. gianni.soraru@unipd.it
D'Ascenzo
Carla
C
Polo
Alberto
A
Palmieri
Arianna
A
Baggio
Linda
L
Vergani
Lodovica
L
Gellera
Cinzia
C
Moretto
Giuseppe
G
Pegoraro
Elena
E
Angelini
Corrado
C
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D003402:Creatine Kinase / Q000097:blood; D042622:DNA Repeat Expansion / Q000235:genetics; D018450:Disease Progression; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006579:Heterozygote; D006801:Humans; D008297:Male; D008875:Middle Aged; D009046:Motor Neurons / Q000378:metabolism / Q000473:pathology; D018485:Muscle Fibers, Skeletal / Q000378:metabolism / Q000473:pathology; D018482:Muscle, Skeletal / Q000473:pathology* / Q000503:physiopathology; D009134:Muscular Atrophy, Spinal / Q000235:genetics / Q000473:pathology* / Q000503:physiopathology; D009410:Nerve Degeneration / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology; D010455:Peptides / Q000235:genetics; D011944:Receptors, Androgen / Q000235:genetics; D032496:Satellite Cells, Skeletal Muscle / Q000378:metabolism / Q000473:pathology; D012720:Severity of Illness Index; D012727:Sex Characteristics
D010455:Peptides; D011944:Receptors, Androgen; C097188:polyglutamine; D003402:Creatine Kinase