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  • Effect of phosphate and temperature on force exerted by white muscle fibres from dogfish

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    Author(s)
    Park-Holohan, S-J
    West, TG
    Woledge, RC
    Ferenczi, MA
    Barclay, CJ
    Curtin, NA
    Griffith University Author(s)
    Barclay, Chris
    Year published
    2010
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    Abstract
    Effects of Pi (inorganic phosphate) are relevant to the in vivo function of muscle because Pi is one of the products of ATP hydrolysis by actomyosin and by the sarcoplasmic reticulum Ca2+ pump. We have measured the Pi sensitivity of force produced by permeabilized muscle fibres from dogfish (Scyliorhinus canicula) and rabbit. The activation conditions for dogfish fibres were crucial: fibres activated from the relaxed state at 5, 12, and 20àwere sensitive to Pi, whereas fibres activated from rigor at 12àwere insensitive to Pi in the range 5-25 mmol l-1. Rabbit fibres activated from rigor were sensitive to Pi. Pi sensitivity ...
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    Effects of Pi (inorganic phosphate) are relevant to the in vivo function of muscle because Pi is one of the products of ATP hydrolysis by actomyosin and by the sarcoplasmic reticulum Ca2+ pump. We have measured the Pi sensitivity of force produced by permeabilized muscle fibres from dogfish (Scyliorhinus canicula) and rabbit. The activation conditions for dogfish fibres were crucial: fibres activated from the relaxed state at 5, 12, and 20àwere sensitive to Pi, whereas fibres activated from rigor at 12àwere insensitive to Pi in the range 5-25 mmol l-1. Rabbit fibres activated from rigor were sensitive to Pi. Pi sensitivity of force produced by dogfish fibres activated from the relaxed state was greater below normal body temperature (12àfor dogfish) in agreement with what is known for other species. The force-temperature relationship for dogfish fibres (intact and permeabilized fibres activated from relaxed) showed that at 12ì normal body temperature, the force was near to its maximum value.
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    Journal Title
    Journal of Muscle Research and Cell Motility
    Volume
    31
    Issue
    1
    DOI
    https://doi.org/10.1007/s10974-010-9198-5
    Copyright Statement
    © The Author(s) 2010. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
    Subject
    Biochemistry and cell biology
    Zoology
    Animal physiology - cell
    Publication URI
    http://hdl.handle.net/10072/35301
    Collection
    • Journal articles

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