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Hyperglycemia and microangiopathy in the eel

M Bendayan, E A Rasio

    Diabetes
    |April 1, 1981
    PubMed
    Summary

    Cold-adapted eels develop hyperglycemia, showing thickened capillaries and altered amino acid composition in their swimbladder. This indicates a microangiopathy linked to chronic high blood sugar in cold environments.

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    Area of Science:

    • Comparative Physiology
    • Endocrinology
    • Aquatic Biology

    Background:

    • Eels exhibit physiological adaptations to environmental changes.
    • Blood glucose regulation is crucial for metabolic homeostasis.
    • Cold adaptation can significantly impact ectotherm physiology.

    Purpose of the Study:

    • To investigate the effects of chronic cold exposure on blood sugar levels in female eels.
    • To examine the microvascular structure and function of the swimbladder rete mirabile in hyperglycemic eels.
    • To determine if cold-induced hyperglycemia is associated with vascular pathology.

    Main Methods:

    • Progressive cold adaptation (2-4°C) of female eels.
    • Measurement of blood glucose concentrations in control (18-20°C) and cold-adapted eels.
    • Histological and biochemical analysis of swimbladder rete mirabile capillaries.
    • In vitro assessment of glucose incorporation into basal lamina glycoproteins.
    • Diffusion capacity measurements using tracer molecules in a perfusion system.

    Main Results:

    • Cold-adapted eels showed significantly elevated blood sugar (avg. 600 mg/dl) compared to controls (avg. 100 mg/dl).
    • Capillary basal laminae in the rete mirabile of hyperglycemic eels were thickened with altered amino acid composition.
    • Increased in vitro glucose incorporation into basal lamina glycoproteins was observed.
    • Diffusion capacity of the rete mirabile was enhanced in hyperglycemic eels.

    Conclusions:

    • Chronic hyperglycemia in cold-adapted eels is associated with swimbladder microangiopathy.
    • Morphological, biochemical, and functional changes characterize this cold-induced vascular alteration.
    • These findings highlight a specific pathological response to prolonged cold stress in eels.

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