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The α2Na+/K+-ATPase is critical for skeletal and heart muscle function in zebrafish.

J. Cell. Sci.2012 Dec 15;125(Pt 24):6166-75. Epub 2012 Oct 24
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摘要


The Na(+)/K(+)-ATPase generates ion gradients across the plasma membrane, essential for multiple cellular functions. In mammals, four different Na(+)/K(+)-ATPase α-subunit isoforms are associated with characteristic cell-type expression profiles and kinetics. We found the zebrafish α2Na(+)/K(+)-ATPase associated with striated muscles and that knockdown causes a significant depolarization of the resting membrane potential in slow-twitch fibers of skeletal muscles. Abrupt mechanosensory responses were observed in α2Na(+)/K(+)-ATPase-deficient embryos, possibly linked to a postsynaptic defect. The α2Na(+)/K(+)-ATPase deficiency reduced the heart rate and caused a loss of left-right asymmetry in the heart tube. Similar phenotypes from knockdown of the Na(+)/Ca(2+) exchanger indicated a role for the interplay between these two proteins in the observed phenotypes. Furthermore, proteomics identified up- and downregulation of specific phenotype-related proteins, such as parvalbumin, CaM, GFAP and multiple kinases, thus highlighting a potential proteome change associated with the dynamics of α2Na(+)/K(+)-ATPase. Taken together, our findings show that zebrafish α2Na(+)/K(+)-ATPase is important for skeletal and heart muscle functions.

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