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Related Concept Videos

Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Myasthenia Gravis: Overview and Treatment01:20

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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.
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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.
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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
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Myasthenia Gravis ll: Pathophysiology01:22

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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...
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Related Experiment Video

Updated: May 2, 2026

Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis
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Myopathy in Whipple's disease

M Swash, M S Schwartz, M J Vandenburg

    Gut
    |October 1, 1977
    PubMed
    Summary

    Whipple's disease can cause muscle problems (myopathy) that improve with antibiotic treatment. Biopsies revealed characteristic bacterial findings in muscle macrophages, linking the myopathy to the infection.

    Area of Science:

    • Neurology
    • Infectious Diseases
    • Pathology

    Background:

    • Whipple's disease is a rare systemic bacterial infection caused by Tropheryma whipplei.
    • Neurological and musculoskeletal manifestations can occur but are less common.

    Observation:

    • A patient diagnosed with Whipple's disease presented with a progressive myopathy.
    • Muscle biopsy revealed type 2 fibre atrophy, type 1 fibre preponderance, and myofibrillar changes.
    • Macrophages in muscle tissue contained periodic acid-Schiff (PAS)-positive material.

    Findings:

    • Electron microscopy confirmed the presence of membranous inclusions and bacillary bodies within muscle macrophages.
    • These ultrastructural findings were consistent with Tropheryma whipplei, similar to those observed in intestinal biopsies.

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  • The patient's myopathy showed improvement following antibiotic therapy targeting Whipple's disease.

    • Implications:

    • This case suggests a direct or indirect role of Tropheryma whipplei in the pathogenesis of myopathy.
    • Antibiotic treatment for Whipple's disease may resolve associated muscular symptoms.
    • Highlights the importance of considering Whipple's disease in the differential diagnosis of myopathies, especially in patients with systemic symptoms.