Abstract:
:Prolonged depolarization of skeletal muscle cells induces entry of extracellular calcium into muscle cells, an event referred to as excitation-coupled calcium entry. Skeletal muscle excitation-coupled calcium entry relies on the interaction between the 1,4-dihydropyridine receptor on the sarcolemma and the ryanodine receptor on the sarcoplasmic reticulum membrane. In this study, we directly measured excitation-coupled calcium entry by total internal reflection fluorescence microscopy in human skeletal muscle myotubes harbouring mutations in the RYR1 gene linked to malignant hyperthermia (MH) and central core disease (CCD). We found that excitation-coupled calcium entry is strongly enhanced in cells from patients with CCD compared with individuals with MH and controls. Furthermore, excitation-coupled calcium entry induces generation of reactive nitrogen species and enhances nuclear localization of NFATc1, which in turn may be responsible for the increased IL-6 released by myotubes from patients with CCD.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Treves S,Vukcevic M,Jeannet PY,Levano S,Girard T,Urwyler A,Fischer D,Voit T,Jungbluth H,Lillis S,Muntoni F,Quinlivan R,Sarkozy A,Bushby K,Zorzato Fdoi
10.1093/hmg/ddq506subject
Has Abstractpub_date
2011-02-01 00:00:00pages
589-600issue
3eissn
0964-6906issn
1460-2083pii
ddq506journal_volume
20pub_type
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