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- W2145393119 abstract "In the present work, we investigate whether changes in excitation–contraction (EC) coupling mode occur in skeletal muscles from ageing mammals by examining the dependence of EC coupling on extracellular Ca 2+ . Single intact muscle fibres from flexor digitorum brevis muscles from young (2–6 months) and old (23–30 months) mice were subjected to tetanic contractile protocols in the presence and absence of external Ca 2+ . Contractile experiments in the absence of external Ca 2+ show that about half of muscle fibres from old mice are dependent upon external Ca 2+ for maintaining maximal tetanic force output, while young fibres are not. Decreased force in the absence of external Ca 2+ was not due to changes in charge movement as revealed by whole‐cell patch‐clamp experiments. Ca 2+ transients, measured by fluo‐4 fluorescence, declined in voltage‐clamped fibres from old mice in the absence of external Ca 2+ . Similarly, Ca 2+ transients declined in parallel with tetanic contractile force in single intact fibres. Examination of inward Ca 2+ current and of mRNA and protein assays suggest that these changes in EC coupling mode are not due to shifts in dihydropyridine receptor (DHPR) and/or ryanodine receptor (RyR) isoforms. These results indicate that a change in EC coupling mode occurs in a population of fibres in ageing skeletal muscle, and is responsible for the age‐related dependence on extracellular Ca 2+ ." @default.
- W2145393119 created "2016-06-24" @default.
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- W2145393119 creator A5074509186 @default.
- W2145393119 date "2004-10-01" @default.
- W2145393119 modified "2023-10-12" @default.
- W2145393119 title "External Ca<sup>2+</sup>-dependent excitation-contraction coupling in a population of ageing mouse skeletal muscle fibres" @default.
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- W2145393119 doi "https://doi.org/10.1113/jphysiol.2004.067322" @default.
- W2145393119 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1665204" @default.
- W2145393119 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15297570" @default.
- W2145393119 hasPublicationYear "2004" @default.
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