Effect of changes in temperature on the force–frequency relationship in the heart of catfish (Clarias gariepinus)

@article{ElSayed2012EffectOC,
  title={Effect of changes in temperature on the force–frequency relationship in the heart of catfish (Clarias gariepinus)},
  author={M. F. El-Sayed and El-Sabry Abu-Amra and Ahmed Badr},
  journal={The Journal of Basic and Applied Zoology},
  year={2012},
  volume={65},
  pages={274-281}
}
Cardiac contractility of the African sharptooth catfish, Clarias gariepinus: role of extracellular Ca2+, sarcoplasmic reticulum, and β-adrenergic stimulation.
TLDR
African catfish species displays great physiological plasticity of E-C coupling, able to improve the ability to maintain cardiac performance under physiological conditions to ecological and/or adverse environmental conditions, such as hypoxic air-breathing activity.

References

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TLDR
In trout ventricle, force correlates with TPT at 5 degrees C and seems to be regulated by a ryanodine-insensitive mechanism, while at 25 degrees C force is correlated with the maximal rate of force development and the sarcoplasmic reticulum appears to contribute significantly to excitation-contraction coupling.
Effects of temperature and calcium availability on cardiac contractility in Synbranchus marmoratus, a neotropical teleost.
Ca2+ protection from the negative inotropic effect of contraction frequency on teleost hearts
TLDR
Both ventricular strip and perfused heart experiments show that a positive inotropic effect of increased Cao can compensate for or even surpass the negative effect of high contraction frequency when both variables are at physiological levels.
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TLDR
The results suggest that a negative FFR relationship in varanid lizard ventricle is caused by decreased amplitude of the Ca( 2+) transient coupled with an increase in diastolic Ca(2+), which leads to incomplete relaxation between beats at high frequencies, which coincides with shortened APD at higher frequencies.
Effect of temperature and temperature acclimation on the ryanodine sensitivity of the trout myocardium
TLDR
The results suggest that the sarcoplamic reticulum calcium release channel of the trout myocardium is expressed but is not functionally involved in beat-to-beat regulation of contractility at either a low temperature (8 °C), or at routine physiological heart rate (>0.6 Hz).
Force frequency relation in the myocardium of rainbow trout
TLDR
The positive effects occurring in 15 mM K+ do not seem to depend on the initial Na+ current, but may nevertheless depend on changes of the cellular Na+ balance as suggested by the effects of adrenaline, K+ and Na+.
Cardiac physiology in tunas. II. Effect of ryanodine, calcium, and adrenaline on force–frequency relationships in atrial strips from skipjack tuna, Katsuwonus pelamis
TLDR
Force–frequency relationships and the dependence upon extracellular calcium as a source of activator calcium were investigated using atrial strips from the skipjack tuna and Ryanodine, a blocker of calcium release from the sarcoplasmic reticulum, decreased active force but did not alter the shape of the force–frequency curve.
ENHANCED MAXIMUM FREQUENCY AND FORCE DEVELOPMENT OF FISH HEARTS FOLLOWING TEMPERATURE ACCLIMATION
TLDR
Inotropic and chronotropic responsiveness of yellow perch and smallmouth bass hearts, following low temperature acclimation, was assessed with ventricle strips mounted for isometric force recording, suggesting an enhancement in calcium handling capabilities following acclimated to low temperature.
Sarcoplasmic reticulum and excitation-contraction coupling at 20 and 10 °C in rainbow trout myocardium
SummaryIsometric force and series membrane potential were recorded in isolated ventricular strips from rainbow trout at 20 and 10 °C. Preparations were electrically stimulated to contract at either
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