Biomarkers of inclusion body myositis.

Abstract:

PURPOSE OF REVIEW:Inclusion body myositis (IBM) is a poorly understood autoimmune and degenerative disorder of skeletal muscle. Here, pathophysiological and diagnostic biomarkers of IBM are reviewed. RECENT FINDINGS:Muscle histopathological biomarkers have been successful in stimulating the study of IBM pathophysiology for over three decades. Their use as diagnostic biomarkers, in contrast, has significant limitations. A blood biomarker, autoantibodies against a 43-kDa muscle protein reported in 2011, has now been identified as targeting cytoplasmic 5' nucleotidase (cN1A; NT5C1A), a protein involved in nucleic acid metabolism. Diagnostic testing for these autoantibodies is of high diagnostic performance for IBM. SUMMARY:Muscle biomarkers have suggested that IBM pathophysiology is linked to myonuclear degeneration and disordered nucleic acid metabolism. A blood biomarker has high diagnostic performance for IBM, and through identification of its target links, IBM autoimmunity and degeneration together, supporting the view that IBM pathophysiology includes abnormal nucleic acid metabolism.

journal_name

Curr Opin Rheumatol

authors

Greenberg SA

doi

10.1097/01.bor.0000434665.75998.f5

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

753-62

issue

6

eissn

1040-8711

issn

1531-6963

pii

00002281-201311000-00014

journal_volume

25

pub_type

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