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)
Year published
2010
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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 ...
View more >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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View more >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.
View less >
Journal Title
Journal of Muscle Research and Cell Motility
Volume
31
Issue
1
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