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Related Experiment Videos

Recombinant leptin exchanges between parabiosed mice but does not reach equilibrium

R B Harris1, J Zhou, D S Weigle

  • 1Neuroscience Department, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808, USA.

The American Journal of Physiology
|June 1, 1997
PubMed
Summary

Leptin, a key hormone in weight regulation, has a short circulating half-life. Even when shared between connected mice, leptin doesn't reach equilibrium, impacting fat and food intake.

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Area of Science:

  • Endocrinology
  • Metabolic Regulation
  • Obesity Research

Background:

  • Parabiosis experiments indicated a circulating lipostatic signal deficiency in ob/ob mice.
  • Leptin was identified as the mutation in ob/ob mice, suggesting it's the lipostatic signal.

Purpose of the Study:

  • To determine the circulating half-life of leptin.
  • To investigate leptin exchange between parabiosed mice.

Main Methods:

  • Measured recombinant leptin disappearance from serum in SWRJ mice.
  • Administered leptin to single ob/ob mice and one partner in parabiosed pairs.
  • Analyzed body weight, food intake, serum insulin, body fat, and body temperature.

Main Results:

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  • Leptin has a circulating half-life of approximately 36 minutes.
  • Leptin treatment reduced food intake, body weight, and fat in single and paired ob/ob mice.
  • Leptin did not reach equilibrium in parabiosed mice, with the injected partner showing greater effects.

    • Conclusions:

    • Leptin's short half-life prevents equilibrium in parabiosed mice despite some exchange.
    • Leptin's lipostatic effects are observed even without reaching full equilibrium between partners.