title: Novel benzodioxan derivative, 5-(3-[((2S)-1,4-benzodioxan-2- ylmethyl)amino]propoxy)-1,3-benzodioxole HCl (MKC-242), with a highly potent and selective agonist activity at rat central serotonin1A receptors.
abstract: The present study characterizes the neurochemical profile of the newly synthesized compound 5-(3-[((2S)-1,4-benzodioxan-2-ylmethyl)amino]propoxy)-1,3-be nzodioxole HCl (MKC-242). In in vitro experiments, MKC-242 had high affinity for serotonin1A (5-HT1A) receptors (Ki: 0.35 nM) and moderate affinity for alpha 1-adrenoceptors (Ki: 21 nM), whereas it had no appreciable affinity for any other neurotransmitter recognition sites studied and 5-HT transporter. MKC-242 (0.3-3.0 mg/kg, s.c.; 1-10 mg/kg, p.o.) caused presynaptic 5-HT1A-receptor-mediated responses (decreases in 5-HT turnover and 5-HT release) and postsynaptic 5-HT1A-receptor-mediated responses (hypothermia, an increase in serum corticosterone level and 5-HT1A behavioral syndrome). The effects of MKC-242 on decarboxylase inhibitor-induced 5-hydroxytryptophan accumulation and rectal temperature were blocked by the 5-HT1A-receptor antagonist N-tert-butyl-3-(4-(2-methoxyphenyl)piperazin-1-yl)-2-phenylpropana mide. The comparative studies on the in vivo responses induced by MKC-242 and the 5-HT1A-receptor full agonist 8-hydroxy-2-(di-n-propyl-amino)tetralin (8-OH-DPAT) showed that MKC-242 and 8-OH-DPAT had similar efficacy at presynaptic 5-HT1A receptors, whereas the former had less efficacy than the latter at postsynaptic 5-HT1A receptors. Furthermore, MKC-242 partially inhibited forskolin-stimulated adenylate cyclase activity in hippocampal membranes. These findings suggest that MKC-242 acts as a full and partial agonist at pre- and postsynaptic 5-HT1A receptors, respectively, in the central nervous system.
authors.affiliation: Department of Pharmacology, Osaka University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Matsuda
authors.forename: T
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Asano
authors.forename: P
authors.initials: P
authors.lastname: Somboonthum
authors.forename: K
authors.initials: K
authors.lastname: Takuma
authors.forename: Y
authors.initials: Y
authors.lastname: Nakano
authors.forename: T
authors.initials: T
authors.lastname: Morita
authors.forename: Y
authors.initials: Y
authors.lastname: Nakasu
authors.forename: H S
authors.initials: HS
authors.lastname: Kim
mesh_terms: D006916:5-Hydroxytryptophan / Q000378:metabolism; D000818:Animals; D001831:Body Temperature / Q000187:drug effects; D001921:Brain / Q000187:drug effects*; D004146:Dioxanes / Q000494:pharmacology*; D004149:Dioxoles / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D011985:Receptors, Serotonin / Q000187:drug effects*; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*
chemical_list: D004146:Dioxanes; D004149:Dioxoles; D011985:Receptors, Serotonin; D017366:Serotonin Receptor Agonists; D006916:5-Hydroxytryptophan; C096294:osemozotan