title: [A TRH analog (DN-1417). Effects on the levels of monoamines and the metabolites in the various brain regions in rats].
abstract: The effects of a TRH (thyrotropin-releasing hormone) analog, DN-1417 (gamma-butyrolactone-gamma-carbonyl-L-histidyl-L-prolinamide citrate), on the levels of norepinephrine (NE), dopamine (DA), serotonin (5-HT) and the metabolites in the various brain regions of rats were determined by means of high performance liquid chromatography with electrochemical detection. DN-1417 (20 mg/kg, i.p.) produced marked decreases in the levels of NE, DA and 5-HT, especially in the nucleus accumbens, striatum and hypothalamus. The maximum effect was observed at 15 min after the administration. DA metabolites, 3,4-dihydroxyphenylacetic acid and homovanillic acid, increased significantly in the nucleus accumbens, striatum and hypothalamus, whereas 3-methoxy-4-hydroxyphenylglycol and 5-hydroxyindoleacetic acid remained unchanged. 3-Methoxytyramine increased significantly in the nucleus accumbens and striatum. Two week chronic administration of DN-1417 (20 mg/kg, i.p.) increased the levels of DA and NE in the nucleus accumbens and DA in the striatum. These results suggest that DN-1417 stimulates the turnover of the cerebral monoamines, especially the release of DA from the nucleus accumbens and striatum in the mesolimbic and nigro-striatal DAergic systems.
mesh_terms: D000818:Animals; D001679:Biogenic Amines / Q000378:metabolism*; D001921:Brain / Q000187:drug effects*; D001923:Brain Chemistry / Q000187:drug effects; D003342:Corpus Striatum / Q000032:analysis; D004298:Dopamine / Q000032:analysis; D006220:Haloperidol / Q000494:pharmacology; D007031:Hypothalamus / Q000032:analysis; D008297:Male; D008694:Methamphetamine / Q000494:pharmacology; D009638:Norepinephrine / Q000032:analysis; D009714:Nucleus Accumbens / Q000032:analysis; D051381:Rats; D011919:Rats, Inbred Strains; D012701:Serotonin / Q000032:analysis; D013973:Thyrotropin-Releasing Hormone / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D001679:Biogenic Amines; D012701:Serotonin; D008694:Methamphetamine; D013973:Thyrotropin-Releasing Hormone; C029762:DN 1417; D006220:Haloperidol; D004298:Dopamine; D009638:Norepinephrine