Channelopathies of skeletal muscle excitability

Stephen C. Cannon

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Familial disorders of skeletal muscle excitability were initially described early in the last century and are now known to be caused by mutations of voltage-gated ion channels. The clinical manifestations are often striking, with an inability to relax after voluntary contraction (myotonia) or transient attacks of severe weakness (periodic paralysis). An essential feature of these disorders is fluctuation of symptoms that are strongly impacted by environmental triggers such as exercise, temperature, or serum K+ levels. These phenomena have intrigued physiologists for decades, and in the past 25 years the molecular lesions underlying these disorders have been identified and mechanistic studies are providing insights for therapeutic strategies of disease modification. These familial disorders of muscle fiber excitability are "channelopathies" caused by mutations of a chloride channel (ClC-1), sodium channel (NaV1.4), calcium channel (CaV1.1), and several potassium channels (Kir2.1, Kir2.6, and Kir3.4). This review provides a synthesis of the mechanistic connections between functional defects of mutant ion channels, their impact on muscle excitability, how these changes cause clinical phenotypes, and approaches toward therapeutics.

Original languageEnglish (US)
Pages (from-to)761-790
Number of pages30
JournalComprehensive Physiology
Volume5
Issue number2
DOIs
StatePublished - Apr 1 2015

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Channelopathies
Ion Channels
Skeletal Muscle
Myotonia
Mutation
Chloride Channels
Sodium Channels
Potassium Channels
Muscular Diseases
Calcium Channels
Paralysis
Phenotype
Muscles
Temperature
Therapeutics
Serum

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Channelopathies of skeletal muscle excitability. / Cannon, Stephen C.

In: Comprehensive Physiology, Vol. 5, No. 2, 01.04.2015, p. 761-790.

Research output: Contribution to journalArticle

Cannon, Stephen C. / Channelopathies of skeletal muscle excitability. In: Comprehensive Physiology. 2015 ; Vol. 5, No. 2. pp. 761-790.
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