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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Allard, B. Mallouk, N. Jacquemond, V. |
| Description | Author Affiliation: Mallouk N ( Laboratoire de Physiologie des Eléments Excitables, Unité Mixte de Recherche, Centre National de la Recherche Scientifique 5578, Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France.); |
| Abstract | Duchenne muscular dystrophy results from the lack of dystrophin, a cytoskeletal protein associated with the inner surface membrane, in skeletal muscle. The cellular mechanisms responsible for the progressive skeletal muscle degeneration that characterizes the disease are still debated. One hypothesis suggests that the resting sarcolemmal permeability for Ca(2+) is increased in dystrophic muscle, leading to Ca(2+) accumulation in the cytosol and eventually to protein degradation. However, more recently, this hypothesis was challenged seriously by several groups that did not find any significant increase in the global intracellular Ca(2+) in muscle from mdx mice, an animal model of the human disease. In the present study, using plasma membrane Ca(2+)-activated K(+) channels as subsarcolemmal Ca(2+) probe, we tested the possibility of a Ca(2+) accumulation at the restricted subsarcolemmal level in mdx skeletal muscle fibers. Using the cell-attached configuration of the patch-clamp technique, we demonstrated that the voltage threshold for activation of high conductance Ca(2+)-activated K(+) channels is significantly lower in mdx than in control muscle, suggesting a higher subsarcolemmal [Ca(2+)]. In inside-out patches, we showed that this shift in the voltage threshold for high conductance Ca(2+)-activated K(+) channel activation could correspond to a approximately 3-fold increase in the subsarcolemmal Ca(2+) concentration in mdx muscle. These data favor the hypothesis according to which an increased calcium entry is associated with the absence of dystrophin in mdx skeletal muscle, leading to Ca(2+) overload at the subsarcolemmal level. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 9 |
| Volume Number | 97 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2000-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calcium Metabolism Muscle Fibers, Skeletal Physiology Muscle, Skeletal Muscular Dystrophy, Animal Physiopathology Potassium Channels Sarcolemma Animals Mice Mice, Inbred C57BL Mice, Inbred Strains Mice, Inbred Mdx Patch-Clamp Techniques Reference Values Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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