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Myasthenia Gravis ll: Pathophysiology

Myasthenia Gravis ll: Pathophysiology

The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...

Disorders of the Skeletal Muscle

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...

Myasthenia Gravis: Overview and Treatment

Myasthenia Gravis: Overview and Treatment

Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
These antibodies interfere with the function of the nicotinic receptors in three ways: by binding to the receptor and disrupting acetylcholine binding; by causing cross-linking of receptors which leads...

Myasthenia Gravis: Diagnostic Tests

Myasthenia Gravis: Diagnostic Tests

Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...

Alterations in Muscle Tone lll

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...

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Updated: May 10, 2026

Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy

Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy

Published on: October 31, 2025

[Rare myositides and myopathies].

Nada Cikes¹, Marko Baresić

¹Zavod za klinicku imunologiju i reumatologiju, Klinika za unutarnje bolesti, Klinicki bolnick centar Zagreb, Kispatićeva 12, 10000 Zagreb.

|June 11, 2013

Summary

This review covers inflammatory myopathies like dermatomyositis and polymyositis, detailing inclusion body myositis and differential diagnoses. It also explores drug-induced, infectious, and endocrine myopathies for comprehensive understanding.

Area of Science:

Neurology
Rheumatology
Pathology

Context:

Inflammatory myopathies encompass a spectrum of conditions including dermatomyositis, polymyositis, and inclusion body myositis.
Secondary myopathies can arise from connective tissue diseases, malignancies, sarcoidosis, and Behçet's disease.
Differential diagnosis of proximal muscle weakness is crucial and includes non-inflammatory myopathies.

Purpose:

To provide a comprehensive overview of inflammatory myopathies.
To detail the characteristics and diagnosis of inclusion body myositis.
To discuss various secondary, drug-induced, infectious, and endocrine myopathies.

Summary:

The article presents inclusion body myositis as a key focus within inflammatory myopathies.

Related Experiment Videos

Last Updated: May 10, 2026

Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy

Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy

Published on: October 31, 2025

It elaborates on statin myopathy as a representative of drug-induced myotoxicity.

Infectious myopathies, particularly parasitic forms, and endocrine myopathies are also overviewed.

Impact:

Enhances understanding of the diverse range of myopathies.
Aids clinicians in diagnosing and managing patients with muscle weakness.
Highlights the importance of considering non-inflammatory causes in myopathy diagnosis.