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Different spatial expressions of c-Fos in the nucleus of the solitary tract following taste stimulation with sodium, potassium, and ammonium ions in rats.

 Yongho Kwak  ;  Jeongsoo Han  ;  Mee Ra Rhyu  ;  Taick Sang Nam  ;  Joong Woo Leem  ;  Bae Hwan Lee 
 JOURNAL OF NEUROSCIENCE RESEARCH, Vol.93(2) : 340-349, 2015 
Journal Title
Issue Date
Afferent Pathways/physiology* ; Ammonium Compounds ; Analysis of Variance ; Animals ; Cations/pharmacology* ; Dose-Response Relationship, Drug ; Male ; Neurons/metabolism ; Potassium ; Proto-Oncogene Proteins c-fos/metabolism* ; Rats ; Rats, Sprague-Dawley ; Sodium ; Solitary Nucleus/cytology ; Solitary Nucleus/drug effects ; Solitary Nucleus/metabolism* ; Taste/drug effects* ; Taste/physiology
Na+ ions ; immediate early genes ; rat brain ; taste
Cation-specific epithelial receptors on the tongue have been well demonstrated. However, active regions along the nucleus of the solitary tract (NST) for cations Na(+), K(+), NH4(+) are still unclear, even though the best responses of NST neurons to taste stimuli vary depending on the cell. In the present study, the spatial distribution patterns of cation-specific active regions in the NST are investigated. The tongues of urethane-anesthetized Sprague-Dawley rats (n = 25) were stimulated with artificial saliva (control), 0.5 M NaCl, 1.0 M NaCl, 0.5 M KCl, and 0.3 M NH(4) Cl. Then, the three-dimensional positions of c-Fos-like-immunoreactive (cFLI) cells in the NST were generated. The spatial distributions of cFLI cells in the NST were compared among five taste stimulations. cFLI cells were observed throughout the NST, irrespective of the stimulus; however, the intermediate-medial central regions of the NST had higher numbers of cFLI cells than the other regions in all taste stimulations. Analysis of images revealed that the activated regions in the NST differed significantly depending on the cations. The intermediate-dorsal-central region and the caudal-ventral region were activated by a 0.5 M concentration of sodium, the rostral-ventral region and the intermediate-dorsal/ventral region were activated by a 1.0 M concentration of sodium, the intermediate-dorsal/ventral region was activated by potassium ions, and the rostral-ventral region and the intermediate-ventral central region were activated by ammonium ions. These results suggest that the responses of NST cells to cation salt ions are regulated differentially.
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1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Physiology (생리학교실) > 1. Journal Papers
Yonsei Authors
Kwak, Yong Ho(곽용호)
Nam, Taick Sang(남택상)
Lee, Bae Hwan(이배환) ORCID logo https://orcid.org/0000-0003-4719-9021
Leem, Joong Woo(임중우) ORCID logo https://orcid.org/0000-0002-1605-2230
Han, Jeong Soo(한정수)
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