Enhanced excitation-coupled Ca(2+) entry induces nuclear translocation of NFAT and contributes to IL-6 release from myotubes from patients with central core disease.

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 Genet

journal_title

Human molecular genetics

authors

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 F

doi

10.1093/hmg/ddq506

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

589-600

issue

3

eissn

0964-6906

issn

1460-2083

pii

ddq506

journal_volume

20

pub_type

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