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Related Experiment Videos

Substrate transport and utilization in fish erythrocytes

M Nikinmaa1, K Tiihonen

  • 1Department of Zoology, University of Helsinki, Finland.

Acta Physiologica Scandinavica
|October 1, 1994
PubMed
Summary

Fish red blood cells primarily use aerobic metabolism, unlike mammals. This review explores how different energy substrates like monocarboxylic acids and amino acids fuel fish erythrocytes, with varying permeability across species.

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Area of Science:

  • Comparative physiology
  • Biochemistry
  • Cellular metabolism

Background:

  • Mammalian erythrocytes rely on anaerobic glycolysis for energy.
  • Fish erythrocytes utilize aerobic metabolism, specifically the Krebs cycle.
  • This metabolic difference allows fish erythrocytes to utilize diverse energy substrates.

Purpose of the Study:

  • To review the membrane permeability of various substrates in fish erythrocytes.
  • To assess the relative importance of different substrates for energy production in fish erythrocytes.
  • To compare substrate utilization between agnathan and teleost fish erythrocytes.

Main Methods:

  • Literature review of existing studies on fish erythrocyte metabolism.
  • Analysis of data on substrate transport across erythrocyte membranes.

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  • Comparative analysis of energy metabolism in different fish groups (Agnatha, Teleostei).

    • Main Results:

    • Fish erythrocytes obtain energy aerobically via the Krebs cycle, utilizing substrates like monocarboxylic acids, glucose, and amino acids.
    • Agnathan erythrocytes exhibit high permeability to glucose, monocarboxylic acids, and amino acids.
    • Teleost erythrocytes often show low glucose permeability, suggesting greater reliance on monocarboxylic acids and certain amino acids (e.g., glutamine).

    Conclusions:

    • Substrate utilization and membrane permeability vary significantly in fish erythrocytes across different taxa.
    • Monocarboxylic acids and specific amino acids may be more critical for energy production in teleost erythrocytes compared to glucose.
    • Understanding these metabolic differences is crucial for comprehending fish physiology and adaptation.