Age-related decrease of the chorda tympani nerve terminal field in the nucleus of the solitary tract is prevented by dietary sodium restriction during development
| Autor: | David L. Hill, Suzanne I. Sollars, A. K. Thaw, B. R. Walker |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Aging
medicine.medical_specialty Taste Central nervous system Chorda Biology Article Rats Sprague-Dawley Reference Values Internal medicine Solitary Nucleus medicine Animals Nerve Endings General Neuroscience Solitary nucleus Solitary tract Diet Sodium-Restricted biology.organism_classification Rats medicine.anatomical_structure Endocrinology Chorda Tympani Nerve Brainstem Nucleus Free nerve ending |
| Zdroj: | Neuroscience. 137:1229-1236 |
| ISSN: | 0306-4522 |
| Popis: | Institution of a low-NaCl diet beginning at embryonic day 3 and continued throughout pre- and postnatal development has widespread effects on the neuroanatomical organization of the first gustatory relay in the nucleus of the solitary tract. To determine when these effects are expressed postnatally, the terminal field of the chorda tympani nerve was compared between sodium-restricted and sodium-replete rats at postnatal days 15–17, postnatal days 25–27, postnatal days 35–37, and adults. Total terminal fields were significantly larger in postnatal days 35–37 and adult sodium-restricted rats compared with aged-matched controls. The group-related differences appear related more to a remodeling of the terminal field in the dorsal zone of the terminal field in controls. Specifically, the terminal field volume in the dorsal zone in controls decreased dramatically from postnatal days 25–27 to postnatal days 35–37 and then again from postnatal days 35–37 to adulthood. In contrast, the fields did not change during development in sodium-restricted rats. These findings suggest that remodeling of the chorda tympani field occurs in controls at about the developmental period of taste response maturation. The lack of remodeling in sodium-restricted rats may be explained by a corresponding lack of functional response development to sodium salts. These results also illustrate the specificity and extent of how early dietary manipulations shape the developing brainstem. |
| Databáze: | OpenAIRE |
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