Changes in the Number of Primary Sensory Neurons in Normal and Vitamin-E-Deficient Rats during Aging
| Autor: | P. Barili, R. De Matteis, Sandra Ciaroni, Riccardo Cuppini, Cecchini T, P. Del Grande |
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| Rok vydání: | 1995 |
| Předmět: |
Male
Dorsum medicine.medical_specialty Sensory Receptor Cells Physiology medicine.medical_treatment Cell Count Sensory system Rats Sprague-Dawley Reference Values Ganglia Spinal Internal medicine Animals Medicine Vitamin E Deficiency Cell Size Neurons business.industry Vitamin E Neurogenesis Age Factors Sensory Systems Nerve Regeneration Rats Endocrinology medicine.anatomical_structure Morphometric analysis Vitamin E deficiency Neuron business Neuroscience |
| Zdroj: | Somatosensory & Motor Research. 12:317-327 |
| ISSN: | 1369-1651 0899-0220 |
| DOI: | 10.3109/08990229509093665 |
| Popis: | In the dorsal root ganglia (DRGs) of vitamin-E-deficient rats, we previously found an increase in the number of neurons during the first 5 months of life (Cecchini et al., 1993, 1994). This neurogenetic event seems to bring forward in time the increase in the number of primary sensory neurons that Devor et al. (1985) found in normal rats aged more than 1 year, but that other authors have not confirmed. The present study had two aims: first, to verify whether neurogenesis spontaneously occurs in DRGs of 14-month-old Sprague-Dawley rats; and, second, to determine whether the neurogenesis enhanced by vitamin E deficiency continues further in the long run, or whether it stops or reverses into neuron loss. A quantitative and morphometric analysis was performed on neurons of L3-L6 DRGs in 14-month-old normal and vitamin-E-deficient rats: the results obtained were compared to those previously obtained in 1-month-old and 5-month-old animals of both dietetic treatment groups, in order to observe the effects of aging on these neuronal populations. The total number of DRG neurons in the control group was higher in older than in younger animals, whereas the value in the vitamin-E-deficient group was lower in older than in younger animals. The present data confirm that neurogenesis occurs in DRGs of normal rats during adult life. Moreover, they show that once the premature neurogenesis in the deficient rats is completed, no further increase in the number of neurons takes place. |
| Databáze: | OpenAIRE |
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