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[Preliminary data on intestinal chemoreceptor responses to amino acids]
Reproduction, Nutrition, Developpement
|January 1, 1980
Summary
Specific amino acid receptors in the small intestine were identified in cats. These receptors respond to amino acids, influencing feeding behavior and protein satiety.
Area of Science:
- Neuroscience
- Gastroenterology
Context:
- Investigating neural mechanisms of nutrient sensing.
- Understanding the role of the vagus nerve in gut-brain communication.
Purpose:
- To identify and characterize intestinal chemoreceptors responding to amino acids.
- To differentiate between specific and non-specific amino acid receptors in the small intestine.
Summary:
- Microelectrophysiological recordings identified 50 neurons in the nodose ganglion activated by amino acid infusion in anesthetized cats.
- These neurons, with non-medullated fibers, showed low-frequency firing and responded specifically to amino acids, distinct from osmotic or mechanical stimuli.
- Two types of receptors were found: specific amino acid receptors and non-specific receptors also responding to glucose.
Impact:
- Provides insights into the neural regulation of feeding behavior, particularly protein satiety.
- Highlights the role of specific intestinal chemoreceptors in nutrient detection and signaling.