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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Goldhamer, David J. Heiny, Judith A. Rindler, Tara N. Oshiro, Naomi Lingrel, Jerry B. Radzyukevich, Tatiana L. Neumann, Jonathon C. |
| Description | Author Affiliation: Radzyukevich TL ( Department of Molecular and Cellular Physiology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267-0576 USA.) |
| Abstract | The Na,K-ATPase 2 isozyme is the major Na,K-ATPase of mammalian skeletal muscle. This distribution is unique compared with most other cells, which express mainly the Na,K-ATPase 1 isoform, but its functional significance is not known. We developed a gene-targeted mouse (sk 2(-/-)) in which the 2 gene (Atp1a2) is knocked out in the skeletal muscles, and examined the consequences for exercise performance, membrane potentials, contractility, and muscle fatigue. Targeted knockout was confirmed by genotyping, Western blot, and immunohistochemistry. Skeletal muscle cells of sk 2(-/-) mice completely lack 2 protein and have no 2 in the transverse tubules, where its expression is normally enhanced. The 1 isoform, which is normally enhanced on the outer sarcolemma, is up-regulated 2.5-fold without change in subcellular targeting. sk 2(-/-) mice are apparently normal under basal conditions but show significantly reduced exercise capacity when challenged to run. Their skeletal muscles produce less force, are unable to increase force to match demand, and show significantly increased susceptibility to fatigue. The impairments affect both fast and slow muscle types. The subcellular targeting of 2 to the transverse tubules is important for this role. Increasing Na,K-ATPase 1 content cannot fully compensate for the loss of 2. The increased fatigability of sk 2(-/-) muscles is reproduced in control extensor digitorum longus muscles by selectively inhibiting 2 enzyme activity with ouabain. These results demonstrate that the Na,K-ATPase 2 isoform performs an acute, isoform-specific role in skeletal muscle. Its activity is regulated by muscle use and enables working muscles to maintain contraction and resist fatigue. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 2 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-01-11 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Isoenzymes Metabolism Muscle, Skeletal Enzymology Sodium-Potassium-Exchanging ATPase Animals Blotting, Western DNA Primers Immunohistochemistry Mice Mice, Knockout Muscle Contraction Physiology Polymerase Chain Reaction Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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