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Related Experiment Videos

Low affinity hypothalamic [3H]mazindol binding: a probe for hypothalamic body weight regulation?

C H Gleiter1, M Linnoila, D J Nutt

  • 1National Institute on Alcoholism and Alcohol Abuse, Bethesda.

Appetite
|April 1, 1989
PubMed
Summary

This study investigated the link between [3H]mazindol binding in the hypothalamus and obesity. Findings indicate that this specific binding site does not appear to regulate body weight or obesity in the tested models.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Pharmacology

Background:

  • Previous research suggested a correlation between low-affinity [3H]mazindol binding in the hypothalamus and body weight regulation.
  • The precise physiological role of this binding site in obesity remains unclear.

Purpose of the Study:

  • To investigate the relationship between low-affinity [3H]mazindol binding in the hypothalamus and body weight in obese mouse models.
  • To examine the effect of electroconvulsive shock (ECS) on this binding site and its potential influence on body weight.

Main Methods:

  • Radioligand binding assays were performed on hypothalamic crude synaptosome preparations from obese (C57 B1/6J ob/ob) and lean mice.
  • NIH Swiss mice served as additional controls.
  • The impact of repeated ECS on [3H]mazindol binding parameters was assessed in rats.

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Main Results:

  • Obese mice exhibited significantly higher body weight and weight gain compared to lean littermates and NIH Swiss mice.
  • No significant alterations in Bmax or Kd values for [3H]mazindol binding were observed in obese mice versus controls.
  • Repeated ECS treatment in rats did not alter the binding parameters of [3H]mazindol in the hypothalamus.

Conclusions:

  • The current data do not support the hypothesis that low-affinity [3H]mazindol binding in the hypothalamus plays a significant physiological role in the control of body weight and obesity.
  • Further research may be needed to elucidate the function of this binding site under different experimental conditions.