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Related Experiment Videos

Adipocyte size distribution in fa/fa rats during development

M L Kaplan, J R Trout, P Smith

    Metabolism: Clinical and Experimental
    |April 1, 1980
    PubMed
    Summary

    Obese Zucker rats (fa/fa) show larger adipocytes early in development, preceding increased cell numbers. This difference in adipocyte size distribution can identify obese rats before visible symptoms appear.

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    Area of Science:

    • Adipose biology
    • Obesity research
    • Animal models

    Background:

    • Adipocyte size and number are key determinants of adipose tissue expansion.
    • Understanding early adipogenesis is crucial for obesity research.

    Purpose of the Study:

    • To analyze epididymal fat pad adipocyte frequency distributions in obese (fa/fa) and nonobese (non-fa/fa) Zucker rats across development.
    • To identify early indicators of obesity in Zucker rats.

    Main Methods:

    • Determined adipocyte size frequency distributions from 2 to 20 weeks of age.
    • Utilized discriminant analysis to assess early identification potential.

    Main Results:

    • Obese (fa/fa) rats consistently had a higher proportion of larger adipocytes than nonobese (non-fa/fa) rats.
    • Increased adipocyte size preceded increased adipocyte number in early obese development.
    • A bimodal adipocyte size distribution emerged in fa/fa rats by 20 weeks.

    Conclusions:

    • Adipocyte size frequency distribution at 2 weeks can predict obese (fa/fa) and nonobese (non-fa/fa) Zucker rats.
    • Early differences in adipocyte size may be linked to lower energy expenditure in young fa/fa rats.

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