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Adipose tissue cellularity in hypo-and hyperthyroid rats.

A Muniesa, M Llobera, E Herrera

    Hormone Research
    |January 1, 1979
    PubMed
    Summary
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    Thyroid hormone deficiency reduces fat cell proliferation, while hyperthyroidism shrinks fat cells without reducing their number. This impacts adipose tissue cellularity and fat storage.

    Area of Science:

    • Endocrinology
    • Metabolic Research
    • Cell Biology

    Background:

    • Thyroid hormones play a crucial role in regulating metabolism and growth.
    • Adipose tissue cellularity, including adipocyte number and size, is a key determinant of energy homeostasis.
    • Understanding the effects of thyroid dysfunction on adipose tissue is vital for metabolic health.

    Purpose of the Study:

    • To investigate the impact of hypothyroidism and hyperthyroidism on adipose tissue cellularity in a rat model.
    • To determine how altered thyroid hormone levels affect adipocyte number, size, and fat-pad weight.

    Main Methods:

    • Male rats were thyroidectomized and administered varying doses of L-thyroxine to induce hypo- and hyperthyroid states.
    • Epididymal fat pads were weighed, and adipocyte diameter and number were quantified.

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  • Fat-pad protein concentration was measured and correlated with adipocyte size.

    • Main Results:

    • Hypothyroidism (low L-thyroxine) reduced fat-pad weight and adipocyte proliferation, with larger adipocyte diameters relative to body weight.
    • Hyperthyroidism (high L-thyroxine) decreased adipocyte size but not the absolute number of adipocytes.
    • Fat-pad protein concentration inversely correlated with adipocyte diameter.

    Conclusions:

    • Thyroid hormone deficiency impairs fat cell proliferation in parallel with overall body growth.
    • Hyperthyroidism leads to a reduction in adipocyte size, contributing to fat depletion without altering adipocyte number.
    • Thyroid status significantly influences adipose tissue cellularity and fat storage capacity.