title: Binding and functional affinity of some newly synthesized phenethylamine and phenoxypropanolamine derivatives for their agonistic activity at recombinant human beta3-adrenoceptor.
abstract: Beta(3)-adrenoceptor is the predominant beta-adrenoceptor in adipocytes and has drawn much attention during the investigation for anti-obesity and antidiabetes therapeutics. Thirteen new compounds have been evaluated for their potencies and efficacies as beta(3)-adrenoceptor agonists on human beta(3)-adrenoceptor expressed in COS-7 and Chinese hamster ovary (CHO) cells using radioligand binding assay and cyclic AMP (cAMP) accumulation assay. Phenoxypropanolamine derivatives, SWR-0334NA (([E)-[4-[5-[(3-phenoxy-2-hydroxypropyl)amino]-2-pentene-3-yl] phenoxy]acetic acid sodium salt), SWR-0335SA ((E)-[4-[5-[(3-phenoxy-2-hydroxypropyl)amino]-2-pentene-3-yl] phenoxy] acetic acid ethanedioic acid), SWR-0342SA (S-(Z)-[4-[[1-[2-[(2-hydroxy-3-phenoxypropyl)]amino] ethyl]-1-propenyl]phenoxy] acetic acid ethanedioic acid), SWR-0348SA-SITA ((E)-[4-[5-[(3-phenoxy-2-hydroxypropyl)amino]-2-hexene-3-yl] phenoxy]acetic acid ethanedioic acid) and SWR-0361SA ((E)-N-methyl[4-[5-[(3-phenoxy-2-hydroxypropyl)amino]-2-pentene-3-yl]phenoxy]acetoamide ethanedioic acid) showed higher agonistic activity for the beta(3)-adrenoceptor. Among the compounds tested, SWR0334NA exhibited full agonist activity (%E(max) = 100.26) despite its lower binding affinity (pK(I) = 6.11). Compounds SWR-0338SA ((E)-[4-[5-[(2-phenyl-2-hydroxyethyl)amino]-2-pentene-3-yl] phenoxy]acetic acid ethanedioic acid), SWR-0339SA (S-(E)-[4-[5-[(3-phenoxy-2-hydroxypropyl)amino]-2-pentene-3-yl] phenoxy] acetic acid ethanedioic acid), SWR-0345HA ((E)-2-methyl-3-[4-[2-(2-phenyl-2-hydroxyethyl-amino)ethoxy] phenyl]-2-propenoic acid ethyl ester hydrochloride), SWR-0358SA ((E)-(2-methoxyethyl)-[4-[5-[(3-phenoxy-2-hydroxypropyl) amino]-2-pentene-3-yl]phenoxy]acetoamide ethanedioic acid) and SWR-0362SA ((E)-1-[[[4-[5-[(3-phenoxy-2-hydroxypropyl)amino]-2-pentene-3-yl]phenoxy]acetyl]carbonyl]piperidine ethanedioic acid) had moderate agonistic activity and were phenethylamine and phenoxypropanolamine derivatives. Compounds SWR-0065HA ([4-[2-[3-[[(3,4-dihydro-4-oxo-[1,2,4]-triazino(4,5-a)indol)-lyl]oxy]-2-hydroxypropylamino]ethoxy]phenyl]acetic acid methyl ester hydrochloride), SWR-0098NA ((E)-[4-[3-[(2-phenyl-2-hydroxyethyl)amino]-1-butenyl] phenoxy]acetic acid sodium salt) and SWR-0302HA ([4-[[4-[2-(3-chlorophenoxy-2-hydroxypropyl)amino]-E-2-butenyl]oxy]phenoxy]acetic acid hydrochloride) had very low binding affinity towards beta(3)-adrenoceptors and they did not induce cAMP accumulation. We concluded that compounds SWR-0334NA, SWR-0335SA, SWR-0342SA, SWR-0348SA-SITA and SWR-0361SA were potential agonists of human beta(3)-adrenoceptor. Further investigation on their selectivity towards beta(3)-adrenoceptor could be useful for the exploration of the physiological properties of the beta(3)-adrenoceptor.
authors.affiliation: Department of Pharmacology, Niigata University of Pharmacy and Applied Life Sciences, 5-13-2 Kamishinei-cho, Niigata 950-2081, Japan.
authors.forename: Maruf
authors.initials: M
authors.lastname: Ahmed
authors.forename: Yoko
authors.initials: Y
authors.lastname: Hanaoka
authors.forename: Takafumi
authors.initials: T
authors.lastname: Nagatomo
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kiso
authors.forename: Takao
authors.initials: T
authors.lastname: Kakita
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kurose
authors.forename: Taku
authors.initials: T
authors.lastname: Nagao
mesh_terms: D017667:Adipocytes; D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D000242:Cyclic AMP / Q000378:metabolism*; D009765:Obesity / Q000188:drug therapy; D010627:Phenethylamines / Q000138:chemical synthesis / Q000493:pharmacokinetics* / Q000494:pharmacology*; D011412:Propanolamines / Q000138:chemical synthesis / Q000493:pharmacokinetics* / Q000494:pharmacology*; D022702:Receptors, Adrenergic, beta-3 / Q000187:drug effects*
chemical_list: D010627:Phenethylamines; D011412:Propanolamines; D022702:Receptors, Adrenergic, beta-3; D000242:Cyclic AMP