AUTHOR=Day Jessica , Otto Sophia , Cash Kathy , Eldi Preethi , Hissaria Pravin , Proudman Susanna , Limaye Vidya , Hayball John D. 

TITLE=Aberrant Expression of High Mobility Group Box Protein 1 in the Idiopathic Inflammatory Myopathies

JOURNAL=Frontiers in Cell and Developmental Biology

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2020.00226

DOI=10.3389/fcell.2020.00226

ISSN=2296-634X

ABSTRACT=<sec><title>Introduction</title><p>High Mobility Group Box Protein 1 (HMGB1) is a DNA-binding protein that exerts inflammatory or pro-repair effects upon translocation from the nucleus. We postulate aberrant HMGB1 expression in immune-mediated necrotising myopathy (IMNM).</p></sec><sec><title>Methods</title><p>Herein, we compare HMGB1 expression (serological and sarcoplasmic) in patients with IMNM with that of other myositis subtypes using immunohistochemistry and ELISA.</p></sec><sec><title>Results</title><p>IMNM (<italic>n</italic> = 62) and inclusion body myositis (IBM, <italic>n</italic> = 14) patients had increased sarcoplasmic HMGB1 compared with other myositis patients (<italic>n</italic> = 46). Sarcoplasmic HMGB1 expression correlated with muscle weakness and histological myonecrosis, inflammation, regeneration and autophagy. Serum HMGB1 levels were elevated in patients with IMNM, dermatomyositis and polymositis, and those myositis patients with extramuscular inflammatory features.</p></sec><sec><title>Discussion</title><p>Aberrant HMGB1 expression occurs in myositis patients and correlates with weakness. A unique expression profile of elevated sarcoplasmic and serum HMGB1 was detected in IMNM.</p></sec>