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Adipose tissue cellularity: effect on insulin and thyroxine

B M Lewis, T M Hayes

    Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
    |September 1, 1978
    PubMed
    Summary
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    Insulin increases rat epididymal fat pad weight by lipid filling, not cell proliferation. Thyroxine decreases weight by reducing adipocyte size, without affecting cell number.

    Area of Science:

    • Endocrinology
    • Adipose tissue biology
    • Cellular metabolism

    Background:

    • Insulin and thyroxine are key hormones regulating metabolism.
    • Adipose tissue cellularity (cell size and number) influences metabolic health.
    • Understanding hormonal effects on adipocytes is crucial for metabolic research.

    Purpose of the Study:

    • To investigate the distinct effects of insulin and thyroxine on adipose tissue cellularity.
    • To determine if these hormones influence fat cell proliferation or size.
    • To elucidate the mechanisms behind hormonal regulation of adipose tissue mass.

    Main Methods:

    • Rats were pre-treated with either insulin or thyroxine.
    • Measurement of fat pad weight, fat cell size, and fat cell number.

    Related Experiment Videos

  • Quantification of (3H) thymidine incorporation into DNA of fat cells and stroma to assess proliferation.

    • Main Results:

    • Insulin treatment led to increased fat pad weight due to lipid accumulation in existing adipocytes.
    • Thyroxine treatment resulted in decreased fat pad weight caused by a reduction in individual fat cell size.
    • Neither insulin nor thyroxine significantly altered the total number of fat cells.

    Conclusions:

    • Hormonal influences on adipose tissue mass are mediated through distinct mechanisms.
    • Insulin promotes adipocyte hypertrophy (lipid filling) rather than hyperplasia (cell proliferation).
    • Thyroxine induces adipocyte atrophy (size reduction) without affecting cell number.