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Articles in PresS, published online ahead of print February 21, 2002
Am J Physiol Regu Physiol, 10.1152/ajpregu.00590.2001
Submitted on September 27, 2001
Accepted on February 18, 2002
1 Section of Oral Biology, The Ohio State University, College of Dentistry, Columbus, OH, USA
* To whom correspondence should be addressed. E-mail: travers.3{at}osu.edu.
The present experiment investigated Fos-like immunoreactivity (FLI) in the nucleus of the solitary tract (NST) following intraoral infusions of 0.1M citric acid, 0.3M NaCl, and 0.3-30mM QHCl in awake, behaving rats. Increases in QHCl concentration produced increases in the numbers of FLI-labeled neurons in the rostral part of the intermediate (ir) and the rostral (r) NST, but the topographic distribution of FLI was consistent across QHCl concentrations and distinctive compared to citric acid. Quinine elicited FLI concentrated in the medial third of thenucleus; acid elicited more broadly distributed FLI concentrated further laterally. Surprisingly, in contrast to QHCl and citric acid, NaCl produced FLI that was indistinguishable from water. Although the functional significance of these patterns are unknown, both citric acid and QHCl are non-preferred stimuli but produced different oromotor behaviors. QHCl (30mM) elicited ~3.2X as many gapes as citric acid (0.1M), and acid elicited more ingestive responses. Parallel differences in FLI expression suggest that different NST regions may have distinctive roles in triggering oromotor behaviors.
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