Leandro Ladislau1, Louiza Arouche-Delaperche1, Yves Allenbach1, Olivier Benveniste2. 1. UPMC Univ Paris 06, INSERM UMRS_974, Center of Research in Myology, AP-HP, Department of Internal Medicine & Clinical Immunology, DHU I2B, Pitié-Salpêtrière Hospital, Sorbonne Université, F-75013, Paris, France. 2. UPMC Univ Paris 06, INSERM UMRS_974, Center of Research in Myology, AP-HP, Department of Internal Medicine & Clinical Immunology, DHU I2B, Pitié-Salpêtrière Hospital, Sorbonne Université, F-75013, Paris, France. olivier.benveniste@aphp.fr.
Abstract
PURPOSE OF REVIEW: This review provides an overview of the potential pathogenic roles of anti-SRP and anti-HMGCR in IMNM over the past 5 years. RECENT FINDINGS: Idiopathic inflammatory myopathies (IIM) are a group of acquired autoimmune disorders that mainly affect the skeletal muscle tissue. Classification criteria of IIM are comprised of polymyositis, dermatomyositis, inclusion body myositis and immune-mediated necrotizing myopathies. One important hallmark of autoimmune diseases is the detection of autoantibodies in patient sera. The anti-SRP (signal recognition particle) and anti-HMGCR (3-hydroxy-3-methylglutaryl coenzyme A reductase) antibodies are specifically associated with IMNM patients, and their detection has been described as related to disease severity. The muscles of IMNM patients are characterized by necrosis, atrophy and regenerating fibres with sparse inflammatory infiltrates. Although an important correlation between autoantibody titres, creatine kinase levels and disease progression/severity has been described in the last few years, the potential pathogenic roles of these autoantibodies have only recently been described.
PURPOSE OF REVIEW: This review provides an overview of the potential pathogenic roles of anti-SRP and anti-HMGCR in IMNM over the past 5 years. RECENT FINDINGS:Idiopathic inflammatory myopathies (IIM) are a group of acquired autoimmune disorders that mainly affect the skeletal muscle tissue. Classification criteria of IIM are comprised of polymyositis, dermatomyositis, inclusion body myositis and immune-mediated necrotizing myopathies. One important hallmark of autoimmune diseases is the detection of autoantibodies in patient sera. The anti-SRP (signal recognition particle) and anti-HMGCR (3-hydroxy-3-methylglutaryl coenzyme A reductase) antibodies are specifically associated with IMNM patients, and their detection has been described as related to disease severity. The muscles of IMNM patients are characterized by necrosis, atrophy and regenerating fibres with sparse inflammatory infiltrates. Although an important correlation between autoantibody titres, creatine kinase levels and disease progression/severity has been described in the last few years, the potential pathogenic roles of these autoantibodies have only recently been described.
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