Spectrum of immune-mediated necrotizing myopathies and their treatments.

Abstract:

PURPOSE OF REVIEW:This review aims to describe the spectrum of clinical, histological, and serological features in patients with immune-mediated necrotizing myopathies (IMNMs). RECENT FINDINGS:Autoantibodies recognizing the signal recognition particle (SRP) or 3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR) define two unique subtypes of necrotizing myositis patient with distinct clinical features. For example, the major histocompatibility class II human leukocyte antigen allele DRB111:01 is a strong immunogenetic risk factor for developing anti-HMGCR autoantibodies whereas B5001 and DQA10104 are over-represented in patients with anti-SRP autoantibodies. Furthermore, statin exposure is a risk factor only for anti-HMGCR autoantibodies. And while skeletal muscle involvement is predominant in most patients with both autoantibodies, lung involvement appears in ∼20% of anti-SRP-positive patients but is more rare in anti-HMGCR-positive patients. Of note, ∼20% of anti-SRP and anti-HMGCR positive patients have significant lymphocytic infiltrates on muscle biopsy and thus would not be formally categorized as having IMNM; aside from this, these patients are clinically indistinguishable from other patients with the same autoantibody profile. SUMMARY:Anti-SRP and anti-HMGCR autoantibodies define unique populations of IMNM patients. It may be more appropriate to subtype myositis patients based on these autoantibodies than on their muscle biopsy features.

journal_name

Curr Opin Rheumatol

authors

Pinal-Fernandez I,Mammen AL

doi

10.1097/BOR.0000000000000335

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

619-24

issue

6

eissn

1040-8711

issn

1531-6963

journal_volume

28

pub_type

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