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Excitation–contraction coupling reflects the metabolic profile of mantle muscle in young cuttlefish (Sepia officinalis).

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Názov: Excitation–contraction coupling reflects the metabolic profile of mantle muscle in young cuttlefish (Sepia officinalis).
Autori: Callaghan, Neal I., Ducros, Loïck, Bennett, J. Craig, Capaz, Juan C., Andrade, José Pedro, Sykes, Antonio V., Driedzic, William R., Lamarre, Simon G., MacCormack, Tyson J.
Zdroj: Invertebrate Biology; Sep2024, Vol. 143 Issue 3, p1-15, 15p
Predmety: SARCOPLASMIC reticulum, CITRATE synthase, MUSCLE metabolism, GLUCOSE metabolism, TRANSMISSION electron microscopy, OXYGEN consumption
Abstrakt: The mantle muscle of common cuttlefish, Sepia officinalis, is responsible both for high‐magnitude and rapid movements for locomotion, as well as sustained ventilation, which require specific metabolic, electrophysiological, and structural organization. Young cuttlefish have a highly oxidative phenotype and a rapid growth rate. Here, we show high rates of oxygen consumption and protein synthesis in juveniles, and these rates decay exponentially over the first few weeks of growth. This is associated with considerable citrate synthase activity (relative to larger cuttlefish) but a lack of glucose metabolism based on zero uptake of glucose by isolated muscle sheets and minimal activity of hexokinase (similar to larger animals). In contrast to glucose metabolism in the heart, glucose metabolism in these muscle sheets was not stimulated by extracellular taurine. Previous research revealed an unusual ion channel complement in mantle myocytes, the most notable feature of which is the lack of a Na+ current during depolarization. Because this adaptation is not consistent across the coleoid clade, we investigated excitation–contraction coupling. Here, mantle energetics and contractility, including the individual components of the total Ca2+ flux driving contraction, were studied. Results indicate that the majority of Ca2+ current underlying contractile stress development capacity in cuttlefish juveniles is not mediated by dihydropyridine‐sensitive L‐type channels, in contrast to their adult counterparts, and the sarcoplasmic reticulum contributes little to routine contractility. We had previously noted an influence of physiological levels of taurine in limiting cardiac contractility but found no analogous sensitivity in mantle muscle. Finally, transmission electron microscopy of subcellular architecture revealed the presence of sarcoplasmic tubular aggregates, suggesting that oxidative inhibition of sarcoplasmic reticulum function limits its role in this life stage. [ABSTRACT FROM AUTHOR]
Copyright of Invertebrate Biology is the property of American Microscopical Society, Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Excitation–contraction coupling reflects the metabolic profile of mantle muscle in young cuttlefish (Sepia officinalis).
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  Data: <searchLink fieldCode="AR" term="%22Callaghan%2C+Neal+I%2E%22">Callaghan, Neal I.</searchLink><br /><searchLink fieldCode="AR" term="%22Ducros%2C+Loïck%22">Ducros, Loïck</searchLink><br /><searchLink fieldCode="AR" term="%22Bennett%2C+J%2E+Craig%22">Bennett, J. Craig</searchLink><br /><searchLink fieldCode="AR" term="%22Capaz%2C+Juan+C%2E%22">Capaz, Juan C.</searchLink><br /><searchLink fieldCode="AR" term="%22Andrade%2C+José+Pedro%22">Andrade, José Pedro</searchLink><br /><searchLink fieldCode="AR" term="%22Sykes%2C+Antonio+V%2E%22">Sykes, Antonio V.</searchLink><br /><searchLink fieldCode="AR" term="%22Driedzic%2C+William+R%2E%22">Driedzic, William R.</searchLink><br /><searchLink fieldCode="AR" term="%22Lamarre%2C+Simon+G%2E%22">Lamarre, Simon G.</searchLink><br /><searchLink fieldCode="AR" term="%22MacCormack%2C+Tyson+J%2E%22">MacCormack, Tyson J.</searchLink>
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  Data: Invertebrate Biology; Sep2024, Vol. 143 Issue 3, p1-15, 15p
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  Data: <searchLink fieldCode="DE" term="%22SARCOPLASMIC+reticulum%22">SARCOPLASMIC reticulum</searchLink><br /><searchLink fieldCode="DE" term="%22CITRATE+synthase%22">CITRATE synthase</searchLink><br /><searchLink fieldCode="DE" term="%22MUSCLE+metabolism%22">MUSCLE metabolism</searchLink><br /><searchLink fieldCode="DE" term="%22GLUCOSE+metabolism%22">GLUCOSE metabolism</searchLink><br /><searchLink fieldCode="DE" term="%22TRANSMISSION+electron+microscopy%22">TRANSMISSION electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22OXYGEN+consumption%22">OXYGEN consumption</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The mantle muscle of common cuttlefish, Sepia officinalis, is responsible both for high‐magnitude and rapid movements for locomotion, as well as sustained ventilation, which require specific metabolic, electrophysiological, and structural organization. Young cuttlefish have a highly oxidative phenotype and a rapid growth rate. Here, we show high rates of oxygen consumption and protein synthesis in juveniles, and these rates decay exponentially over the first few weeks of growth. This is associated with considerable citrate synthase activity (relative to larger cuttlefish) but a lack of glucose metabolism based on zero uptake of glucose by isolated muscle sheets and minimal activity of hexokinase (similar to larger animals). In contrast to glucose metabolism in the heart, glucose metabolism in these muscle sheets was not stimulated by extracellular taurine. Previous research revealed an unusual ion channel complement in mantle myocytes, the most notable feature of which is the lack of a Na+ current during depolarization. Because this adaptation is not consistent across the coleoid clade, we investigated excitation–contraction coupling. Here, mantle energetics and contractility, including the individual components of the total Ca2+ flux driving contraction, were studied. Results indicate that the majority of Ca2+ current underlying contractile stress development capacity in cuttlefish juveniles is not mediated by dihydropyridine‐sensitive L‐type channels, in contrast to their adult counterparts, and the sarcoplasmic reticulum contributes little to routine contractility. We had previously noted an influence of physiological levels of taurine in limiting cardiac contractility but found no analogous sensitivity in mantle muscle. Finally, transmission electron microscopy of subcellular architecture revealed the presence of sarcoplasmic tubular aggregates, suggesting that oxidative inhibition of sarcoplasmic reticulum function limits its role in this life stage. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Invertebrate Biology is the property of American Microscopical Society, Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/ivb.12439
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        Text: English
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      – SubjectFull: SARCOPLASMIC reticulum
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              Text: Sep2024
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