Reactions of rat sympathetic neurons to ethanol exposure are age-dependent.
Age-differences in the sensitivity of peripheral sympathetic neurons to chronic ethanol exposure and ethanol withdrawal were studied in male Wistar rats aged 4 months, 12 months, or 24 to 25 months. The superior cervical ganglia (SCG) of the young (4 months) and the 2-year-old rats responded to a 12-day or 4-week ethanol exposure with significantly increased catecholamine turnover, while the ganglia of the middle-aged rats (12 months) showed only a minor increase in the intensity of catecholamine fluorescence and tyrosine hydroxylase immunoreactivity. Extensive neuronal vacuolation was found in the 4 months ethanol-exposed SCG, probably as a reaction of a subpopulation of neurons to increased stimulation. Ethanol-induced neuronal loss was most prominent in the SCG of the oldest age group. Contrary to the marked changes in SCG functional and morphometric parameters, the pelvic sympathetic neurons in the hypogastric ganglion showed no significant changes after ethanol exposure. The pattern of ethanol-induced morphological alterations found in the present study did not provide unambiquous support for either the "accelerated aging" or the "increased vulnerability" concept regarding ethanol-aging interactions in the nervous system.
Department of Public Health, University of Tampere, Finland.
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Jaatinen
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Hervonen
D000375:Aging / Q000502:physiology*; D000818:Animals; D004734:Energy Metabolism / Q000502:physiology; D000431:Ethanol / Q000494:pharmacology*; D006651:Histocytochemistry; D007001:Hypogastric Plexus / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D008297:Male; D009410:Nerve Degeneration / Q000187:drug effects; D009474:Neurons / Q000187:drug effects* / Q000201:enzymology; D051381:Rats; D017208:Rats, Wistar; D017783:Superior Cervical Ganglion / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D013564:Sympathetic Nervous System / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D014446:Tyrosine 3-Monooxygenase / Q000276:immunology / Q000378:metabolism
D000431:Ethanol; D014446:Tyrosine 3-Monooxygenase