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Functional implications of RyR-DHPR relationships in skeletal and cardiac muscles Biol. Res.
FRANZINI-ARMSTRONG,CLARA.
Dihydropyridine receptors (DHPRs) and ryanodine receptors (RyRs) interact during EC coupling within calcium release units, CRUs. The location of the two channels and their positioning are related to their role in EC coupling. als DHPR and RyR1 of skeletal muscle form interlocked arrays. Groups of four DHPRs (forming a tetrad) are located on alternate RyR1s. This association provides the structural framework for reciprocal signaling between the two channels. RyR3 are present in some skeletal muscles in association with RyR1 and in ratios up to 1:1. RyR3 neither induce formation of tetrads by DHPRs nor sustain EC coupling. RyR3 are located in a parajunctional position, in proximity of the RyR1-DHPR complexes, and they may be indirectly activated by calcium...
Tipo: Journal article Palavras-chave: Calcium release units; Dihydropyridine receptors; Ryanodine receptors; Transverse tubules; Sarcoplasmic reticulum.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400003
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