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RyR1-targeted drug discovery pipeline integrating FRET-based high-throughput screening and human myofiber dynamic Ca(2+) assays

Elevated cytoplasmic [Ca(2+)] is characteristic in severe skeletal and cardiac myopathies, diabetes, and neurodegeneration, and partly results from increased Ca(2+) leak from sarcoplasmic reticulum stores via dysregulated ryanodine receptor (RyR) channels. Consequently, RyR is recognized as a high-v...

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Detalles Bibliográficos
Autores principales: Rebbeck, Robyn T., Singh, Daniel P., Janicek, Kevyn A., Bers, Donald M., Thomas, David D., Launikonis, Bradley S., Cornea, Razvan L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7000700/
https://www.ncbi.nlm.nih.gov/pubmed/32019969
http://dx.doi.org/10.1038/s41598-020-58461-1
Descripción
Sumario:Elevated cytoplasmic [Ca(2+)] is characteristic in severe skeletal and cardiac myopathies, diabetes, and neurodegeneration, and partly results from increased Ca(2+) leak from sarcoplasmic reticulum stores via dysregulated ryanodine receptor (RyR) channels. Consequently, RyR is recognized as a high-value target for drug discovery to treat such pathologies. Using a FRET-based high-throughput screening assay that we previously reported, we identified small-molecule compounds that modulate the skeletal muscle channel isoform (RyR1) interaction with calmodulin and FK506 binding protein 12.6. Two such compounds, chloroxine and myricetin, increase FRET and inhibit [(3)H]ryanodine binding to RyR1 at nanomolar Ca(2+). Both compounds also decrease RyR1 Ca(2+) leak in human skinned skeletal muscle fibers. Furthermore, we identified compound concentrations that reduced leak by > 50% but only slightly affected Ca(2+) release in excitation-contraction coupling, which is essential for normal muscle contraction. This report demonstrates a pipeline that effectively filters small-molecule RyR1 modulators towards clinical relevance.