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Related Concept Videos

Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
Myocarditis I: Introduction01:21

Myocarditis I: Introduction

Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
Myocarditis III: Medical Management01:14

Myocarditis III: Medical Management

Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...

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Related Experiment Videos

Cutting edge issues in polymyositis.

Anna Ghirardello1, Sandra Zampieri, Elena Tarricone

  • 1Division of Rheumatology, Department of Clinical and Experimental Medicine, University of Padova, Italy.

Clinical Reviews in Allergy & Immunology
|December 31, 2010
PubMed
Summary
This summary is machine-generated.

Idiopathic inflammatory myopathies (IIM) involve skeletal muscle autoimmunity, with autoantibodies targeting muscle proteins. Non-immunological factors like endoplasmic reticulum stress also contribute to IIM pathogenesis.

Related Experiment Videos

Area of Science:

  • Autoimmune diseases
  • Skeletal muscle pathology
  • Immunology

Background:

  • Idiopathic inflammatory myopathies (IIM) primarily affect skeletal muscle.
  • IIM subtypes include polymyositis (PM), dermatomyositis (DM), and inclusion body myositis.
  • Emerging evidence points to B-cell responses against muscle antigens and non-immunological mechanisms in IIM.

Purpose of the Study:

  • To elucidate the immunological and non-immunological mechanisms driving idiopathic inflammatory myopathies.
  • To investigate the role of specific autoantigens and autoantibodies in IIM pathogenesis.
  • To explore the link between myositis, autoimmunity, and potential cancer associations.

Main Methods:

  • Analysis of muscle biopsies from IIM patients (PM, DM) and healthy controls.
  • Assessment of autoantigen expression (Jo-1, Mi-2) in muscle cells.
  • Detection and characterization of myositis-specific autoantibodies (MSA).

Main Results:

  • Increased expression of Jo-1 and Mi-2 autoantigens in IIM muscle biopsies, particularly in regenerating cells.
  • Identification of various MSA targets, including aminoacyl-tRNA synthetases and the Mi-2 complex.
  • Upregulation of myositis autoantigens in neoplastic tissues suggests a cancer-autoimmunity link.
  • Evidence of endoplasmic reticulum stress independent of MHC-1 upregulation in IIM muscle.

Conclusions:

  • Skeletal muscle is central to IIM, driven by autoantigen-specific immune responses and autoantibodies.
  • Myositis autoantigens are upregulated in regenerating muscle and potentially linked to cancer.
  • Non-immunological pathways, such as ER stress, contribute to IIM pathogenesis.
  • Further research is needed to fully understand the complex mechanisms underlying IIM and specific muscle involvement.