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Amiloride-sensitive sodium signals and salt appetite: multiple gustatory pathways
1Program in Neurobiology and Behavior, University of Washington, Seattle, Washington 98195, USA. roitman@u.washington.edu
The American Journal of Physiology
|June 11, 1999
Summary
Sodium appetite in rats relies on amiloride-sensitive signals. These signals are crucial for identifying sodium (Na+) but are not exclusively transmitted by the chorda tympani (CT) nerve.
Area of Science:
- Neuroscience
- Physiology
- Sensory Biology
Background:
- Sodium (Na+) appetite is vital for physiological balance.
- The chorda tympani (CT) nerve is traditionally believed to convey critical Na+ taste signals.
- Amiloride-sensitive sodium channels are implicated in Na+ detection.
Purpose of the Study:
- To investigate if sodium appetite exclusively depends on CT-mediated, amiloride-sensitive signals.
- To identify the afferent pathways involved in Na+ taste perception.
Main Methods:
- Rats were subjected to sham drinking and actual intake tests with sodium chloride (NaCl) and potassium chloride (KCl) solutions.
- Amiloride, an inhibitor of epithelial sodium channels, was administered.
- Chorda tympani transection (CTX) was performed on a subset of rats.
Main Results:
- Amiloride significantly reduced NaCl intake, indicating the importance of amiloride-sensitive signals.
- CTX reduced NaCl intake, but a significant residual intake remained.
- Amiloride further suppressed intake in CTX rats, suggesting a non-CT afferent pathway.
Conclusions:
- Amiloride-sensitive Na+ channels are essential gustatory substrates for Na+ identification in rats.
- These critical amiloride-sensitive signals are transmitted via both the CT nerve and an additional, unidentified afferent pathway.