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- W1975976108 abstract "The α2/δ1 subunit forms part of the dihydropyridine receptor, an essential protein complex for excitation–contraction (EC) coupling in skeletal muscle. Because of the lack of a viable knock‐out animal, little is known regarding the role of the α2/δ1 subunit in EC coupling or in other cell functions. Interestingly, the α2/δ1 appears before the α1 subunit in development and contains extracellular conserved domains known to be important in cell signalling and inter‐protein interactions. These facts raise the possibility that the α2/δ1 subunit performs vital functions not associated with EC coupling. Here, we tested the hypothesis that the α2/δ1 subunit is important for interactions of muscle cells with their environment. Using confocal microscopy, we followed the immunolocalization of α2/δ1 and α1 subunits with age. We found that in 2‐day‐old myotubes, the α2/δ1 subunit concentrated towards the ends of the cells, while the α1 subunit clustered near the centre. As myotubes aged (6–12 days), the α2/δ1 became evenly distributed along the myotubes and co‐localized with α1. When the expression of α2/δ1 was blocked with siRNA, migration, attachment and spreading of myoblasts were impaired while the L‐type calcium current remained unaffected. The results suggest a previously unidentified role of the α2/δ1 subunit in skeletal muscle and support the involvement of this protein in extracellular signalling. This new role of the α2/δ1 subunit may be crucial for muscle development, muscle repair and at times in which myoblast attachment and migration are fundamental." @default.
- W1975976108 created "2016-06-24" @default.
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- W1975976108 date "2008-02-01" @default.
- W1975976108 modified "2023-10-17" @default.
- W1975976108 title "The calcium channel α2/δ1 subunit is involved in extracellular signalling" @default.
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- W1975976108 doi "https://doi.org/10.1113/jphysiol.2007.147959" @default.
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