Effects of seasonal acclimatization on action potentials and sarcolemmal K+ currents in roach (Rutilus rutilus) cardiac myocytes.

@article{Badr2017EffectsOS,
  title={Effects of seasonal acclimatization on action potentials and sarcolemmal K+ currents in roach (Rutilus rutilus) cardiac myocytes.},
  author={Ahmed Badr and Minna Hassinen and Mohamed Abdel-Fattah El-Sayed and Matti Vornanen},
  journal={Comparative biochemistry and physiology. Part A, Molecular \& integrative physiology},
  year={2017},
  volume={205},
  pages={
          15-27
        }
}
  • A. BadrM. Hassinen M. Vornanen
  • Published 1 March 2017
  • Environmental Science
  • Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
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12 Citations
Highly Influential Citations
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Background Citations
3
Methods Citations
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Results Citations
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12 Citations

Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes

The response of sodium (INa) and calcium (ICa) currents in heat tolerance of cardiac excitability was examined in a eurythermic fish and the response of INa to seasonal acclimatization conforms to the TDEE hypothesis.

Electrical excitability of roach ( Rutilus rutilus) ventricular myocytes: effects of extracellular K+, temperature, and pacing frequency.

Although high [K+]o antagonizes the negative effects of high temperature on excitation threshold, the precipitous depression of the rate of AP upstroke and complete loss of excitability in some myocytes suggest that the combination of highTemperature and high [ K+]O will severely impair ventricular excitabilityIn roach.

Thermal acclimation and seasonal acclimatization: a comparative study of cardiac response to prolonged temperature change in shorthorn sculpin

The effects of seasonal acclimatization on cardiac responses to low temperatures are stronger than those of acclimation to similar temperatures in laboratory conditions, highlighting the importance of seasonal cues for cardiac remodelling in a eurythermal fish.

Repolarizing potassium currents in working myocardium of Japanese quail: Novel translational model for cardiac electrophysiology.

Small functional If current in sinoatrial pacemaker cells of the brown trout (Salmo trutta fario) heart despite strong expression of HCN channel transcripts.

The results strongly suggest that fH regulation in the brown trout heart is largely independent on If, and the presence and activity of HCN channels in the SA pacemaker cells and their putative role in heart rate regulation is examined.

Transcript expression of inward rectifier potassium channels of Kir2 subfamily in Arctic marine and freshwater fish species

The cardiac Kir2 composition seems to be dependent on both phylogenetic position and thermal preference of the fish.

Ionic currents underlying different patterns of electrical activity in working cardiac myocytes of mammals and non-mammalian vertebrates.

Electrical Excitability of the Fish Heart and Its Autonomic Regulation

Feeling the heat: source–sink mismatch as a mechanism underlying the failure of thermal tolerance

A modified hypothesis about high temperature-induced failure of electrically excitable tissues is discussed, and can explain a number of heat-induced effects, including reduced heart rate, reduced synaptic transmission between neurons and reduced impulse transfer from neurons to muscles.

Temperature and the Cardiovascular System

References

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Seasonal acclimatization of the electrical excitability of the eurythermal roach increases pumping capacity of the roach heart by maximizing heart rate, but without compromising the stability of cardiac excitation.

Effect of thermal acclimation on action potentials and sarcolemmal K+ channels from Pacific bluefin tuna cardiomyocytes.

The results indicate the bluefin AP is relatively short compared with other teleosts, which may allow thebluefin heart to function at cold temperatures without the necessity for thermal compensation of APD.

Temperature-dependent expression of sarcolemmal K(+) currents in rainbow trout atrial and ventricular myocytes.

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Responses of Action Potential and K+ Currents to Temperature Acclimation in Fish Hearts: Phylogeny or Thermal Preferences?

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Acute heat tolerance of cardiac excitation in the brown trout (Salmo trutta fario)

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  • M. Vornanen
  • Biology
    The American journal of physiology
  • 1997
The findings imply that Ca influx through L-type Ca channels can contribute significantly to the activation of contraction in the ventricular myocytes of fish heart.

ENHANCED MAXIMUM FREQUENCY AND FORCE DEVELOPMENT OF FISH HEARTS FOLLOWING TEMPERATURE ACCLIMATION

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.

Maximum heart rate in brown trout (Salmo trutta fario) is not limited by firing rate of pacemaker cells.

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The effect of temperature on spontaneous action potential discharge of the isolated sinus venosus from winter and summer plaice (Pleuronectes platessa)

The observed changes in pacemaker discharge rate were not influenced by the processes that determine the duration of the pacemaker diastolic depolarisation but were modulated by the channel events that give rise to the action potential.
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