title: Increased sensitivity to 5-hydroxytryptamine due to intraventricular administration of 5,6-dihydroxytryptamine.
abstract: The possibility that intraventricular administration of 5,6-dihydroxytryptamine (5,6-DHT) can cause a development of denervation hypersensitivity to central 5-hydroxytryptamine (5-HT) was examined in rats with special reference to the pituitary-adrenocortical functions. Pretreatment with intraventricular injection of 5,6-DHT itself did not affect the basal concentrations or stress-induced increases of plasma B. The same pre-treatment, however, elicited augmented responses to subcutaneous injection of 5-HTP, i.e. there was a significant rise in the concentrations of plasma B as compared with those in the controls. These results suggest a development of denervation hypersensitivity to 5-HT following intraventricular injection of 5,6-DHT.
mesh_terms: D015115:5,6-Dihydroxytryptamine / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D001921:Brain / Q000378:metabolism*; D003345:Corticosterone / Q000097:blood; D003624:Darkness; D003714:Denervation; D007030:Hypothalamo-Hypophyseal System / Q000187:drug effects*; D007276:Injections, Intraventricular; D008027:Light; D008297:Male; D010913:Pituitary-Adrenal System / Q000187:drug effects*; D051381:Rats; D012701:Serotonin / Q000378:metabolism / Q000494:pharmacology* / Q000502:physiology; D013312:Stress, Physiological
chemical_list: D012701:Serotonin; D015115:5,6-Dihydroxytryptamine; D003345:Corticosterone