title: Structure-activity relationship studies of central nervous system agents. 5. Effect of the hydrocarbon chain on the affinity of 4-substituted 1-(3-chlorophenyl)piperazines for 5-HT1A receptor site.
abstract: The effect of the hydrocarbon chain of the model 4-substituted 1-(3-chlorophenyl)piperazines 12-31 on their affinity for 5-HT1A receptor sites was investigated. It was found that elongation of the 4-n-alkyl chain strongly increases the 5-HT1A affinity of the investigated compounds. The affinity reaches the maximum (Ki = 2.67 nM) for the n-hexyl derivative 20. It was shown that hydrophobic interactions of N-4 substituents of 1-arylpiperazines significantly contribute to their 5-HT1A affinity. The specific binding constant was defined as the receptor affinity of the protonated species of compounds under physiological conditions. The range of Ki(AH+) = 1 - 3 x 10(-11) M is a specific affinity limit of the investigated class of compounds at the 5-HT1A receptor sites.
authors.affiliation: Institute of Pharmacology, Polish Academy of Sciences, Kraków.
authors.forename: J L
authors.initials: JL
authors.lastname: Mokrosz
authors.forename: M
authors.initials: M
authors.lastname: Pietrasiewicz
authors.forename: B
authors.initials: B
authors.lastname: Duszyńska
authors.forename: M T
authors.initials: MT
authors.lastname: Cegła
mesh_terms: D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D000818:Animals; D001921:Brain / Q000378:metabolism; D002490:Central Nervous System / Q000187:drug effects*; D006838:Hydrocarbons / Q000737:chemistry*; D010879:Piperazines / Q000378:metabolism* / Q000494:pharmacology; D011869:Radioligand Assay; D051381:Rats; D011985:Receptors, Serotonin / Q000187:drug effects / Q000378:metabolism*; D013329:Structure-Activity Relationship; D013379:Substrate Specificity; D013764:Tetrahydronaphthalenes / Q000737:chemistry
chemical_list: D006838:Hydrocarbons; D010879:Piperazines; D011985:Receptors, Serotonin; D013764:Tetrahydronaphthalenes; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; C015068:1-(3-chlorophenyl)piperazine