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- W2055861261 abstract "The rat pineal gland was chosen as a model system to study how aging affects the capacity of surviving neurons to compensate for partial destruction of a neural pathway. The pineal gland receives bilateral overlapping sympathetic innervation from the two internal carotid nerves, whose activity regulates several aspects of pineal metabolism in a circadian fashion. The most dramatic of these is the marked nighttime increase in the activity of N-acetyltransferase, the rate-limiting enzyme in melatonin synthesis. These features allow for the pineal gland to be used as a model system for studies on neuronal plasticity, since it is possible to create specific partial neural lesions and to evaluate functional recovery subsequently at the cellular level. We examined the activity of N-acetyltransferase and the content of melatonin in the pineal gland as indices of pineal function at various time points after unilateral surgical denervation (lesion of one of the two internal carotid nerves) in 4-month-(young) and 25-month-old (aged) rats. At both ages, the nighttime levels of the two parameters were significantly lower 8 h after this lesion than in sham-operated animals of the same age, indicating impaired function. When examined at later time points (i.e., 1.5 and 10 days after this lesion), both young and aged animals exhibited full recovery in these two parameters. Measurement of specific neuronal uptake of [3H]norepinephrine was utilized as an index of the number of sympathetic varicosities innervating the pineal gland.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2055861261 date "1991-02-01" @default.
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- W2055861261 title "Functional recovery and collateral neuronal sprouting examined in young and aged rats following a partial neural lesion" @default.
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- W2055861261 doi "https://doi.org/10.1016/0006-8993(91)90507-r" @default.
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