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Related Experiment Videos

Estradiol interacts with gastric or postgastric food stimuli to decrease sucrose ingestion in ovariectomized rats

N Geary1, D Trace, G P Smith

  • 1Department of Psychiatry, Cornell University Medical College, White Plains, NY.

Physiology & Behavior
|January 1, 1995
PubMed
Summary
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Systemic estradiol administration inhibits sucrose intake in ovariectomized rats by affecting postgastric, not pregastric, feeding cues. This suggests estradiol influences postingestive factors controlling meal initiation.

Area of Science:

  • Endocrinology
  • Neuroscience
  • Behavioral Science

Background:

  • Estradiol, a key hormone, influences various physiological processes, including appetite regulation.
  • Ovariectomized rats serve as a model to study hormonal effects on feeding behavior.
  • Pregastric and postingestive factors play distinct roles in controlling food intake.

Purpose of the Study:

  • To investigate whether systemic estradiol administration inhibits sucrose intake in ovariectomized rats.
  • To determine if estradiol's inhibitory effect is mediated by pregastric or postingestive stimuli.

Main Methods:

  • Utilized a sham feeding preparation in ovariectomized rats.
  • Administered systemic estradiol to experimental groups.
  • Measured sucrose intake during real feeding and sham feeding conditions.

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Main Results:

  • Estradiol significantly reduced sucrose intake during real feeding within 5-6 minutes.
  • Estradiol had no significant effect on sucrose intake during sham feeding.
  • The findings indicate pregastric stimuli alone are insufficient to mediate estradiol's inhibitory effect.

Conclusions:

  • Estradiol's inhibition of feeding in ovariectomized rats relies on gastric and/or postgastric food stimuli.
  • These postingestive stimuli appear to selectively influence the initial phase of a meal.
  • Hormonal regulation of appetite involves complex interactions between hormonal status and sensory feedback from the gastrointestinal tract.