Details

Autor(en) / Beteiligte

• Fratta, Pietro
• Engel, W. King
• McFerrin, Janis
• Davies, Kelvin J.A.
• Lin, Sharon W.
• Askanas, Valerie

Titel

Proteasome Inhibition and Aggresome Formation in Sporadic Inclusion-Body Myositis and in Amyloid-β Precursor Protein-Overexpressing Cultured Human Muscle Fibers

Ist Teil von

• The American journal of pathology, 2005-08, Vol.167 (2), p.517-526

Ort / Verlag

Bethesda, MD: Elsevier Inc

Erscheinungsjahr

2005

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The 26S proteasome system is involved in eliminating various proteins, including ubiquitinated misfolded/unfolded proteins, and its inhibition results in cellular accumulation of protein aggregates. Intramuscle-fiber ubiquitinated multiprotein-aggregates are char-acteristic of sporadic inclusion-body myositis (s-IBM) muscle fibers. Two major types of aggregates exist, containing either amyloid-β (Aβ) or phosphorylated tau (p-tau). We have now asked whether abnormalities of the 26S proteasome contribute to s-IBM pathogenesis and whether the multiprotein aggregates have features of aggresomes. Using cultured human muscle fibers we also studied the effect of amyloid-β precursor protein (AβPP) overexpression on proteasome function and the influence of proteasome inhibition on aggresome formation. We report that in s-IBM muscle biopsies 26S proteasome subunits were immunodetected in the γ-tubulin-associated aggresomes, which also contained Aβ, p-tau, ubiquitin, and HSP70. In addition, a) expression of proteasome subunits was greatly increased, b) the 20Sα proteasome subunit co-immunoprecipitated with AβPP/Aβ, and c) the three major proteasomal proteolytic activities were reduced. In cultured muscle fibers, AβPP-overexpressing fibers displayed diminished proteasomal proteolytic activities, and addition of proteasome inhibitor strikingly increased aggresome formation. Accordingly, proteasome dysfunction in s-IBM muscle fibers may play a role in accumulation of misfolded, potentially cytotoxic proteins and may be induced by increased intracellular AβPP/Aβ.