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Related Experiment Videos

Calcium paradox from cyclostome to man: a comparative study.

O Poupa, K B Helle, M Lomský

    Comparative Biochemistry and Physiology. A, Comparative Physiology
    |January 1, 1985
    PubMed
    Summary

    The calcium paradox was not observed in cold-blooded animals (poikilotherms) but was present in warm-blooded animals (homoiotherms). This suggests temperature is not the sole factor, with hagfish myocardial cell structure potentially explaining the absence of the calcium paradox.

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    Area of Science:

    • Cardiology
    • Comparative Physiology
    • Cellular Biology

    Background:

    • The calcium paradox is a phenomenon observed in myocardial tissue.
    • Understanding its occurrence across different species and temperatures is crucial for cardiovascular research.

    Purpose of the Study:

    • To investigate the presence or absence of the calcium paradox in various poikilotherm species.
    • To compare findings in poikilotherms with those in homoiotherms, including humans.
    • To explore potential reasons for the absence of the calcium paradox in certain species.

    Main Methods:

    • Ventricular strips from seven poikilotherm species (hagfish, teleosts, amphibians, reptiles) were studied at low temperatures (8-12°C).
    • Myocardial preparations from human atria were studied at physiological temperatures (30°C and 37°C).

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  • Viper myocardium was tested at multiple temperatures (12°C, 22°C, 32°C) for comparison.

    • Main Results:

    • The calcium paradox was not induced in ventricular strips of the studied poikilotherms at 8-12°C.
    • The calcium paradox was observed in human atrial preparations at 30°C and 37°C, consistent with other homoiotherms.
    • Viper myocardium did not exhibit the calcium paradox even at 32°C, while human myocardium did at 30°C.
    • The absence of the calcium paradox in poikilotherms was not solely attributable to low temperatures.

    Conclusions:

    • The calcium paradox's occurrence is species-dependent and not exclusively linked to temperature.
    • Specific cellular characteristics, such as the large glycocalyx in hagfish myocardial cells, may prevent the calcium paradox.
    • Further research into myocardial cell structures and calcium handling mechanisms across species is warranted.