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Peptide YY, appetite and food intake
1Department of Metabolic Medicine, Imperial College London, W12 0NN, UK.
The Proceedings of the Nutrition Society
|June 18, 2005
Summary
Peptide YY (PYY)3-36, a gut hormone, is released after eating and signals the brain to reduce food intake. This peptide may play a key role in regulating appetite and combating obesity.
Area of Science:
- Neuroendocrinology
- Gastroenterology
- Obesity Research
Background:
- Obesity is a global health crisis, driven by complex neural, hormonal, and psychological factors influencing appetite.
- The gut-brain axis is crucial for regulating physiological functions, including nutrient sensing and food intake.
- Gut hormones provide feedback to the central nervous system regarding nutrient availability.
Purpose of the Study:
- To investigate the role of Peptide YY (PYY)3-36 in regulating food intake.
- To elucidate the mechanism by which PYY3-36 influences hypothalamic appetite circuits.
Main Methods:
- Measuring PYY release in response to food intake.
- Assessing the effects of peripheral PYY3-36 administration on food consumption in rodents and humans.
- Investigating the neural pathways involved in PYY3-36 signaling, including Y2 receptors and hypothalamic neurons.
Main Results:
- PYY is released postprandially, with concentrations proportional to meal energy content.
- PYY3-36 administration significantly inhibited food intake for several hours in both rodents and humans.
- PYY3-36 acts via Y2 receptors to inhibit NPY neurons and potentially stimulate POMC neurons in the hypothalamus.
Conclusions:
- PYY3-36 is a key gut-derived satiety signal that provides feedback to hypothalamic appetite regulation.
- PYY3-36 demonstrates potential as a therapeutic target for managing appetite and obesity.
- This peptide plays a significant role in the physiological regulation of daily food intake.