Autophagy markers LC3 and p62 accumulate in immune-mediated necrotizing myopathy.

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 Nerve

journal_title

Muscle & nerve

authors

Girolamo F,Lia A,Annese T,Giannini M,Amati A,D'Abbicco D,Tampoia M,Virgintino D,Ribatti D,Serlenga L,Iannone F,Trojano M

doi

10.1002/mus.26608

subject

Has Abstract

pub_date

2019-09-01 00:00:00

pages

315-327

issue

3

eissn

0148-639X

issn

1097-4598

journal_volume

60

pub_type

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