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Biochemical and behavioral alterations in developing rats treated with 5,7-dihydroxytryptamine

GR Breese, RA Vogel and RA Mueller

Intracisternal administration of 5,7-dihydroxytryptamine (5,7-DHT) to immature rats produced a marked reduction of brain norepinephrine and serotonin. Accompanying these reductions of brain amines were a decrease in body weight and alterations in behavior. After treatment with 5,7-DHT at 3 days of age, locomotor activity was significantly elevated at 14 days of age, but was reduced at 28 days of age. 5,7-DHT alone also induced a significant deficit in acquisition of the shuttle- box avoidance response and blocked body movements observed after decapitation. Treatment with either pargyline or desipramine before injection of 5,7-DHT eliminated the effect of 5,7-DHT on noradrenergic fibers while enhancing the effects of 5,7-DHT on brain serotonergic fibers. These treatments also minimized the deficits of 5,7-DHT on growth and on acquisition of the avoidance response and reversed the blockade of decapitation convulsions. However, animals pretreated with pargyline or desipramine before they received 5,7-DHT still demonstrated hyperactivity at 14 days of age equivalent to that observed in neonates that received only 5,7-DHT. Furthermore, a behavioral syndrome induced by 30 mg/kg of 5-hydroxytryptamine was markedly potentiated by all of the 5,7-DHT treatments which suggest that serotonin receptors were supersensitive.

Volume 205, Issue 3, pp. 587-595, 06/01/1978
Copyright © 1978 by American Society for Pharmacology and Experimental Therapeutics




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Copyright © 1978 by the American Society for Pharmacology and Experimental Therapeutics.