Enhanced dihydropyridine receptor channel activity in the presence of ryanodine receptor View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-03

AUTHORS

J Nakai, R T Dirksen, H T Nguyen, I N Pessah, K G Beam, P D Allen

ABSTRACT

Excitation-contraction coupling in skeletal muscle involves a voltage sensor in the plasma membrane which, in response to depolarization, causes an intracellular calcium-release channel to open. The skeletal isoform of the ryanodine receptor (RyR-1) functions as the Ca2+-release channel and the dihydropyridine receptor (DHPR) functions as the voltage sensor and also as an L-type Ca2+ channel. Here we examine the possibility that there is a retrograde signal from RyR-1 to the DHPR, using myotubes from mice homozygous for a disrupted RyR-1 gene (dyspedic mice). As expected, we find that there is no excitation-contraction coupling in dyspedic myotubes, but we also find that they have a roughly 30-fold reduction in L-type Ca2+-current density. Injection of dyspedic myotubes with RyR-1 complementary DNA restores excitation-contraction coupling and causes the density of L-type Ca2+ current to rise towards normal. Despite the differences in Ca2+-current magnitude, measurements of charge movement indicate that the density of DHPRs is similar in dyspedic and RyR-1-expressing myotubes. Our results support the possibility of a retrograde signal by which RyR-1 enhances the function of DHPRs as Ca2+ channels. More... »

PAGES

72-75

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/380072a0

DOI

http://dx.doi.org/10.1038/380072a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006283661

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/8598910


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