title: Iptakalim alleviated the increase of extracellular dopamine and glutamate induced by 1-methyl-4-phenylpyridinium ion in rat striatum.
abstract: The present study examined the effect of iptakalim (Ipt), a novel ATP-sensitive potassium (K(ATP)) channel opener (KCO), on 1-methyl-4-phenylpyridinium ion (MPP(+))-induced dopamine (DA) and glutamate efflux in extracellular fluid of rat striatum, using microdialysis technique. Rats were implanted guide cannula in the striatum and artificial cerebrospinal fluid was infused through a microdialysis probe to detect the level of DA and glutamate in the striatum. MPP(+) significantly enhanced the extracellular levels of DA and its metabolites, DOPAC and HVA, as well as glutamate. Application of Ipt (1, 10, 100 microM) concentration-dependently suppressed DA and its metabolites efflux induced by MPP(+). Concomitantly, Ipt reduced the increase of extracellular glutamate induced by MPP(+). These results suggest that Ipt can regulate DA and glutamate efflux induced by MPP(+) in rat striatum.
authors.affiliation: Laboratory of Neuropharmacology, Department of Anatomy, Histology & Pharmacology, Nanjing Medical University, Jiangsu, China.
authors.forename: Yan-Jing
authors.initials: YJ
authors.lastname: Yang
authors.forename: Qing-Min
authors.initials: QM
authors.lastname: Wang
authors.forename: Li-Fang
authors.initials: LF
authors.lastname: Hu
authors.forename: Xiu-Lan
authors.initials: XL
authors.lastname: Sun
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Ding
authors.forename: Gang
authors.initials: G
authors.lastname: Hu
mesh_terms: D015655:1-Methyl-4-phenylpyridinium / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D000818:Animals; D003342:Corpus Striatum / Q000187:drug effects / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism; D005110:Extracellular Space / Q000187:drug effects / Q000378:metabolism; D018698:Glutamic Acid / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D011437:Propylamines / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: C502260:N-(1-methylethyl)-1,1,2-trimethylpropylamine; D011437:Propylamines; D018698:Glutamic Acid; D015655:1-Methyl-4-phenylpyridinium; D004298:Dopamine