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Ca-dependent slow action potentials in neuromuscular diseases.

L Nicola Siri1, A L Dubrovsky, O D Uchitel

  • 1Instituto de Biologia Celular, Facultad de Medicina, Universidad de Buenos Aires, Republica Argentina.

Journal of Cellular Physiology
|June 1, 1990
PubMed
Summary

Skeletal muscle fibers from patients with myopathies showed a higher frequency of calcium-dependent action potentials (CaAPs) compared to other neuromuscular diseases and healthy controls. This finding offers new insights into the electrophysiological characteristics of myopathies.

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Area of Science:

  • Neuroscience
  • Muscle Physiology
  • Electrophysiology

Background:

  • Neuromuscular diseases (NMD) encompass a range of disorders affecting skeletal muscle function.
  • Understanding the electrophysiological properties of muscle fibers in NMD is crucial for diagnosis and treatment.
  • Slow calcium-dependent action potentials (CaAPs) play a role in muscle excitability.

Purpose of the Study:

  • To investigate the characteristics of slow Ca-dependent action potentials in skeletal muscle fibers from patients with various neuromuscular diseases.
  • To compare the frequency and parameters of CaAPs in myopathies, other neuromuscular diseases, and normal controls.

Main Methods:

  • Biopsies from skeletal muscle fibers of patients with myopathies (Fascioscapulohumeral Dystrophy, Polymyositis), other diseases (Amyotrophic Lateral Sclerosis, Central Core Disease, Mitochondrial Myopathy, Polyneuritis, von Eulenberg's Paramyotonia), and normal controls were studied.

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  • Experiments were conducted under current-clamp conditions with non-calcium membrane currents minimized.
  • Muscle fiber responses to depolarizing pulses were classified into fully developed Ca-action potentials (CaAPs), abortive non-regenerative Ca responses (NrR), or passive responses (WR).

    • Main Results:

    • Skeletal muscle fibers exhibited three types of responses: CaAPs, NrR, or WR.
    • The frequency of CaAPs was significantly higher in myopathic diseases (46% of fibers) compared to other diseases (22%) and normal controls (15%).
    • No significant differences were found in resting constants or CaAP parameters between normal and diseased muscle fibers.

    Conclusions:

    • Myopathies are associated with an increased incidence of CaAPs in skeletal muscle fibers.
    • The electrophysiological findings suggest distinct alterations in muscle excitability in myopathies.
    • Further research is warranted to explore the functional implications of altered CaAP generation in neuromuscular diseases.