期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 281, 期 44, 页码 33477-33486出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M602306200
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资金
- NCI NIH HHS [R01-CA95739] Funding Source: Medline
- NHLBI NIH HHS [R01-HL69000] Funding Source: Medline
- NIAMS NIH HHS [R01-AR45593] Funding Source: Medline
- NIA NIH HHS [R01-AG15556] Funding Source: Medline
Dantrolene reduces the elevated myoplasmic Ca2+ generated during malignant hyperthermia, a pharmacogenetic crisis triggered by volatile anesthetics. Although specific binding of dantrolene to the type 1 ryanodine receptor (RyR1), the Ca2+ release channel of skeletal muscle sarcoplasmic reticulum, has been demonstrated, there is little evidence for direct dantrolene inhibition of RyR1 channel function. Recent studies suggest store-operated Ca2+ entry (SOCE) contributes to skeletal muscle function, but the effect of dantrolene on this pathway has not been examined. Here we show that azumolene, an equipotent dantrolene analog, inhibits a component of SOCE coupled to activation of RyR1 by caffeine and ryanodine, whereas the SOCE component induced by thapsigargin is not affected. Our data suggest that azumolene distinguishes between two mechanisms of cellular signaling to SOCE in skeletal muscle, one that is coupled to and one independent from RyR1.
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