ArticleJournal of comparative physiology. B, Biochemical, systemic, and environmental physiology2014
Seasonal acclimatization of the cardiac action potential in the Arctic navaga cod (Eleginus navaga, Gadidae).
Article in Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 24 citations in OpenAlex.
- Phenanthrene alters the electrical activity of atrial and ventricular myocytes of a polar fish, the Navaga cod.Aquatic toxicology (Amsterdam, Netherlands) · 2021Article
- Cardiophysiological responses of the air-breathing Alaska blackfish to cold acclimation and chronic hypoxic submergence at 5°C.The Journal of experimental biology · 2020Article
- Contractile performance of the Alaska blackfish (Dallia pectoralis) ventricle: Assessment of the effects of temperature, pacing frequency, the role of the sarcoplasmic reticulum in contraction and adrenergic stimulation.Comparative biochemistry and physiology. Part A, Molecular & integrative physiology · 2019Article
- Seasonal changes of cholinergic response in the atrium of Arctic navaga cod (Eleginus navaga).Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology · 2017Article
- Seasonal acclimatization of the cardiac potassium currents (IK1 and IKr) in an arctic marine teleost, the navaga cod (Eleginus navaga).Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology · 2015Article
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Authors and funding
3 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Freshwater fishes of north-temperate latitudes adjust electrical excitability of the heart to seasonal temperature changes by changing expression levels of ion channel isoforms. However, little is known about thermal responses of action potential (AP) in the hearts of marine polar fishes. To this end, we examined cardiac AP in the atrial myocardium of the Arctic navaga cod (Eleginus navaga) from the White Sea (Russia) acclimatized to winter (March) and summer (September) seasons. Acute increases in temperature from 4 to 10 °C were associated with increases in heart rate, maximum velocity of AP upstroke and negative resting membrane potential, while duration of AP was shortened in both winter-acclimatized and summer-acclimatized navaga hearts. In winter, there was a compensatory shortening (41.1%) of atrial AP duration and this was associated with a strong increase in transcript expression of Erg K(+) channels, known to produce the rapid component of the delayed rectifier K(+) current, I(Kr). Smaller increases were found in the expression of Kir2.1 channels that produce the inward rectifier K(+) current, I(K1). These findings indicate that the heart of navaga cod has a good acclimatory capacity in electrical excitation of cardiac myocytes, which enables cardiac function in the cold-eurythermal waters of the subarctic White Sea.
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