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Related Experiment Videos

Capillary permeability in adipose tissue

W P Paaske, S L Nielsen

    Acta Physiologica Scandinavica
    |September 1, 1976
    PubMed
    Summary

    This study measured capillary permeability in rabbit adipose tissue using gamma emitting isotopes. Adipose tissue exhibits similar capillary permeability to vasodilated skeletal muscle, despite a smaller capillary surface area.

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    Area of Science:

    • Physiology
    • Biomedical Engineering
    • Pharmacology

    Background:

    • Capillary permeability is crucial for nutrient and waste exchange.
    • Understanding adipose tissue's microvascular function is vital for metabolic research.
    • Current methods for measuring capillary permeability have limitations.

    Purpose of the Study:

    • To quantify capillary permeability in isolated rabbit inguinal fat pads.
    • To compare adipose tissue capillary permeability with other tissues like skeletal muscle.
    • To assess the functional capillary surface area in adipose tissue.

    Main Methods:

    • Utilized external registration of gamma emitting isotopes (51Cr-EDTA).
    • Administered isotopes via close arterial bolus injection into the isolated inguinal fat pad.
    • Measured plasma flow and isotope extraction to determine capillary diffusion capacity.

    Main Results:

    • An average extraction of 26% for 51Cr-EDTA was observed.
    • Capillary diffusion capacity was calculated as 2.0 ml/100 g-min.
    • This value is approximately half that of vasodilated skeletal muscle.

    Conclusions:

    • Adipose tissue demonstrates significant capillary permeability.
    • Despite a smaller capillary surface area, adipose tissue's permeability is comparable to vasodilated skeletal muscle.
    • The findings provide insights into microvascular function in adipose tissue during slight metabolic activation.

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