Abstract:
INTRODUCTION:The molecular mechanism of immune-mediated necrotizing myopathy (IMNM) remains unknown. Autophagy impairment, described in autoimmune diseases, is a key process in myofiber protein degradation flux and muscle integrity and has not been studied in IMNM. METHODS:Muscle biopsies from patients with IMNM (n = 40), dermatomyositis (DM; 24), polymyositis (PM; 8), polymyositis with mitochondrial pathology (4), sporadic inclusion body myositis (8), and controls (6) were compared by immunohistochemistry. RESULTS:The proportions of myofibers containing autophagy markers LC3b and p62 were higher in IMNM than in DM or PM and correlated with creatine kinase levels. In IMNM, compartmentalized LC3b puncta were located in regenerating and degenerating myofibers surrounded by major histocompatibility complex type II+ inflammatory cells. Several IMNM myofibers accumulated ubiquitin and misfolded protein. DISCUSSION:The detection of LC3b+ or p62+ myofibers could be used in differentiating IMNM from PM. The identification of autophagy-modifying molecules potentially could improve patients' outcomes. Muscle Nerve, 2019.
journal_name
Muscle Nervejournal_title
Muscle & nerveauthors
Girolamo F,Lia A,Annese T,Giannini M,Amati A,D'Abbicco D,Tampoia M,Virgintino D,Ribatti D,Serlenga L,Iannone F,Trojano Mdoi
10.1002/mus.26608subject
Has Abstractpub_date
2019-09-01 00:00:00pages
315-327issue
3eissn
0148-639Xissn
1097-4598journal_volume
60pub_type
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