Forskning ved Københavns Universitet - Københavns Universitet

Forside

Lu AE58054, a 5-HT6 antagonist, reverses cognitive impairment induced by subchronic phencyclidine in a novel object recognition test in rats

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Jorn Arnt
  • Benny Bang-Andersen
  • Ben Grayson
  • Franklin P Bymaster
  • Michael Cohen
  • Neil W DeLapp
  • Bruno Giethlen
  • Mads Kreilgaard
  • David L McKinzie
  • Joanna C Neill
  • David L Nelson
  • Søren M Nielsen
  • Mette N Poulsen
  • John M Schaus
  • Louise M Witten
The in-vitro potency and selectivity, in-vivo binding affinity and effect of the 5-HT(6)R antagonist Lu AE58054 ([2-(6-fluoro-1H-indol-3-yl)-ethyl]-[3-(2,2,3,3-tetrafluoropropoxy)-benzyl]-amine) on impaired cognition were evaluated. Lu AE58054 displayed high affinity to the human 5-HT(6) receptor (5-HT(6)R) with a Ki of 0.83 nm. In a 5-HT(6) GTPgammaS efficacy assay Lu AE58054 showed no agonist activity, but demonstrated potent inhibition of 5-HT-mediated activation. Besides medium affinity to adrenergic alpha(1A)- and alpha(1B)-adrenoreceptors, Lu AE58054 demonstrated >50-fold selectivity for more than 70 targets examined. Orally administered Lu AE58054 potently inhibited striatal in-vivo binding of the 5-HT(6) antagonist radioligand [(3)H]Lu AE60157 ([(3)H]8-(4-methylpiperazin-1-yl)-3-phenylsulfonylquinoline), with an ED(50) of 2.7 mg/kg. Steady-state modelling of an acute pharmacokinetic/5-HT(6)R occupancy time-course experiment indicated a plasma EC(50) value of 20 ng/ml. Administration of Lu AE58054 in a dose range (5-20 mg/kg p.o.) leading to above 65% striatal 5-HT(6)R binding occupancy in vivo, reversed cognitive impairment in a rat novel object recognition task induced after subchronic treatment for 7 d with phencyclidine (PCP 2 mg/kg b.i.d., i.p. for 7 d, followed by 7 d drug free). The results indicate that Lu AE58054 is a selective antagonist of 5-HT(6)Rs with good oral bioavailability and robust efficacy in a rat model of cognitive impairment in schizophrenia. Lu AE58054 may be useful for the pharmacotherapy of cognitive dysfunction in disease states such as schizophrenia and Alzheimer's disease.
OriginalsprogEngelsk
TidsskriftInternational Journal of Neuropsychopharmacology
Vol/bind13
Udgave nummer8
Sider (fra-til)1021-33
Antal sider13
ISSN1461-1457
DOI
StatusUdgivet - sep. 2010
Eksternt udgivetJa

ID: 100994363