Fine structure and metabolism of multiply innervated fast muscle fibres in teleost fish
Identifieur interne : 002089 ( Main/Exploration ); précédent : 002088; suivant : 002090Fine structure and metabolism of multiply innervated fast muscle fibres in teleost fish
Auteurs : Ian A. Johnston [Royaume-Uni] ; Thomas W. Moon [Royaume-Uni]Source :
- Cell and Tissue Research [ 0302-766X ] ; 1981-08-01.
Abstract
Summary: Both the fast and slow muscle fibres of advanced teleost fish are multiply innervated. The fraction of slow-fibre volume occupied by mitochondria is 31.3%, 25.5% and 24.6%, respectively, for the myotomal muscles of brook trout (Salvelinus fontinalis), crucian carp (Carassius carassius), and plaice (Pleuronectes platessa), respectively. The corresponding figures for the fast muscles of these species are 9.3%, 4.6% and 2.0%, respectively. Cytochrome-oxidase and citrate-synthetase activities in the fast muscles of 9 species of teleost range from 0.20–0.93 μmoles substrate utilised, g wet weight muscle-1 min-1 (at 15° C) or around 4–17% of that of the corresponding slow fibres. Ultrastructural analyses reveal a marked heterogeneity within the fast-fibre population. For example, the fraction of fibres with <1% or >10% mitochondria is 0,4,42% and 36, 12 and 0%, respectively, for trout, carp and plaice. In general, small fibres (<500 μm2) have the highest and large fibres (>1,500 μm2) the lowest mitochondrial densities. The complexity of mitochondrial cristae is reduced in fast compared to slow fibres. Hexokinase activities range from 0.4–2.5 in slow and from 0.08–0.7 μmoles, g wet weight-1 min-1 in fast muscles, indicating a wide variation in their capacity for aerobic glucose utilisation. Phosphofructokinase activities are 1.2 to 3.6 times higher in fast than slow muscles indicating a greater glycolytic potential. Lactate dehydrogenase activities are not correlated with either the predicted anaerobic scopes for activity or the anoxic tolerances of the species studied. The results indicate a considerable variation in the aerobic capacities and principal fuels supporting activity among the fast muscles of different species. Brook trout and crucian carp are known to recruit fast fibres at low swimming speeds. For these species the aerobic potential of the fast muscle is probably sufficient to meet the energy requirements of slow swimming.
Url:
DOI: 10.1007/BF00210021
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Johnston</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Physiology, University of St. Andrews, St. Andrews, Fife, Scotland</wicri:regionArea><wicri:noRegion>Scotland</wicri:noRegion></affiliation></author><author><name sortKey="Moon, Thomas W" sort="Moon, Thomas W" uniqKey="Moon T" first="Thomas W." last="Moon">Thomas W. Moon</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Physiology, University of St. Andrews, St. Andrews, Fife, Scotland</wicri:regionArea><wicri:noRegion>Scotland</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Cell and Tissue Research</title><title level="j" type="abbrev">Cell Tissue Res.</title><idno type="ISSN">0302-766X</idno><idno type="eISSN">1432-0878</idno><imprint><publisher>Springer-Verlag</publisher><pubPlace>Berlin/Heidelberg</pubPlace><date type="published" when="1981-08-01">1981-08-01</date><biblScope unit="volume">219</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="93">93</biblScope><biblScope unit="page" to="109">109</biblScope></imprint><idno type="ISSN">0302-766X</idno></series><idno type="istex">2A28877521DAD295F1D185424764608AD2935403</idno><idno type="DOI">10.1007/BF00210021</idno><idno type="ArticleID">BF00210021</idno><idno type="ArticleID">Art9</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0302-766X</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Summary: Both the fast and slow muscle fibres of advanced teleost fish are multiply innervated. The fraction of slow-fibre volume occupied by mitochondria is 31.3%, 25.5% and 24.6%, respectively, for the myotomal muscles of brook trout (Salvelinus fontinalis), crucian carp (Carassius carassius), and plaice (Pleuronectes platessa), respectively. The corresponding figures for the fast muscles of these species are 9.3%, 4.6% and 2.0%, respectively. Cytochrome-oxidase and citrate-synthetase activities in the fast muscles of 9 species of teleost range from 0.20–0.93 μmoles substrate utilised, g wet weight muscle-1 min-1 (at 15° C) or around 4–17% of that of the corresponding slow fibres. Ultrastructural analyses reveal a marked heterogeneity within the fast-fibre population. For example, the fraction of fibres with <1% or >10% mitochondria is 0,4,42% and 36, 12 and 0%, respectively, for trout, carp and plaice. In general, small fibres (<500 μm2) have the highest and large fibres (>1,500 μm2) the lowest mitochondrial densities. The complexity of mitochondrial cristae is reduced in fast compared to slow fibres. Hexokinase activities range from 0.4–2.5 in slow and from 0.08–0.7 μmoles, g wet weight-1 min-1 in fast muscles, indicating a wide variation in their capacity for aerobic glucose utilisation. Phosphofructokinase activities are 1.2 to 3.6 times higher in fast than slow muscles indicating a greater glycolytic potential. Lactate dehydrogenase activities are not correlated with either the predicted anaerobic scopes for activity or the anoxic tolerances of the species studied. The results indicate a considerable variation in the aerobic capacities and principal fuels supporting activity among the fast muscles of different species. Brook trout and crucian carp are known to recruit fast fibres at low swimming speeds. For these species the aerobic potential of the fast muscle is probably sufficient to meet the energy requirements of slow swimming.</div></front></TEI><affiliations><list><country><li>Royaume-Uni</li></country></list><tree><country name="Royaume-Uni"><noRegion><name sortKey="Johnston, Ian A" sort="Johnston, Ian A" uniqKey="Johnston I" first="Ian A." last="Johnston">Ian A. Johnston</name></noRegion><name sortKey="Moon, Thomas W" sort="Moon, Thomas W" uniqKey="Moon T" first="Thomas W." last="Moon">Thomas W. Moon</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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