Imidazole Aldoximes Effective in Assisting Butyrylcholinesterase Catalysis of Organophosphate Detoxification
摘要:
Intoxication by organophosphate (OP) nerve agents and pesticides should be addressed by efficient, quickly deployable countermeasures such as antidotes reactivating acetylcholinesterase or scavenging the parent OP. We present here synthesis and initial in vitro characterization of 14 imidazole aldoximes and their structural refinement into three efficient reactivators of human butyrylcholinesterase (hBChE) inhibited covalently by nerve agent OPs, sarin, cyclosarin, VX, and the OP pesticide metabolite, paraoxon. Rapid reactivation of OP-hBChE conjugates by uncharged and nonprotonated tertiary imidazole aldoximes allows the design of a new OP countermeasure by conversion of hBChE from a stoichiometric to catalytic OP bioscavenger with the prospect of oral bioavailability and central nervous system penetration. The enhanced in vitro reactivation efficacy determined for tertiary imidazole aldoximes compared to that of their quaternary N-methyl imidazolium analogues is attributed to ion pairing of the cationic imidazolium with Asp 70, altering a reactive alignment of the aldoxime with the phosphorus in the OP-hBChE conjugate.
[EN] CATALYTIC SCAVENGERS OF ORGANOPHOSPHATES TO POTENTIATE BUTYRYLCHOLINESTERASE (BCHE) AS A CATALYTIC BIOSCAVENGER AND METHODS FOR MAKING AND USING THEM<br/>[FR] PIÉGEURS CATALYTIQUES D'ORGANOPHOSPHATES POUR POTENTIALISER LA BUTYRYLCHOLINESTÉRASE (HBCHE)
申请人:UNIV CALIFORNIA
公开号:WO2015057822A1
公开(公告)日:2015-04-23
Provided are N-alkyl imidazole 2-aldoximes, including cationic imidazolium and uncharged tertiary imidazole aldoximes, and compositions and methods for making and using them, including methods for reactivating human butyrylcholinesterase (hBChE) or acetylcholinesterase (hAChE ) inhibited by organophosphate (OP). By administration of a composition of the invention, the inactive or conjugated hBChE-OP or hAChE-OP is reactivated and the catalytic cycle of turnover and inactivation of the OP is completed; and in alternative embodiments, secondary mechanisms of reversible protection of hBChE and hAChE from irreversible inactivation by OPs and reactivation of tissue AChE also contribute to overall efficacy.
CATALYTIC SCAVENGERS OF ORGANOPHOSPHATES TO POTENTIATE BUTYRYLCHOLINESTERASE (hBChE) AS A CATALYTIC BIOSCAVENGER AND METHODS FOR MAKING AND USING THEM
申请人:THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
公开号:US20160256438A1
公开(公告)日:2016-09-08
Provided are N-alkyl imidazole 2-aldoximes, including cationic imidazolium and uncharged tertiary imidazole aldoximes, and compositions and methods for making and using them, including methods for reactivating human butyrylcholinesterase (hBChE) or acetylcholinesterase (hAChE) inhibited by organophosphate (OP). By administration of a composition of the invention, the inactive or conjugated hBChE-OP or hAChE-OP is reactivated and the catalytic cycle of turnover and inactivation of the OP is completed; and in alternative embodiments, secondary mechanisms of reversible protection of hBChE and hAChE from irreversible inactivation by OPs and reactivation of tissue AChE also contribute to overall efficacy.
Catalytic scavengers of organophosphates to potentiate butyrylcholinesterase (hBChE) as a catalytic bioscavenger and methods for making and using them
申请人:THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
公开号:US10172831B2
公开(公告)日:2019-01-08
Provided are N-alkyl imidazole 2-aldoximes, including cationic imidazolium and uncharged tertiary imidazole aldoximes, and compositions and methods for making and using them, including methods for reactivating human butyrylcholinesterase (hBChE) or acetylcholinesterase (hAChE) inhibited by organophosphate (OP). By administration of a composition of the invention, the inactive or conjugated hBChE-OP or hAChE-OP is reactivated and the catalytic cycle of turnover and inactivation of the OP is completed; and in alternative embodiments, secondary mechanisms of reversible protection of hBChE and hAChE from irreversible inactivation by OPs and reactivation of tissue AChE also contribute to overall efficacy.
CATALYTIC SCAVENGERS OF ORGANOPHOSPHATES TO POTENTIATE BUTYRYLCHOLINESTERASE (BCHE) AS A CATALYTIC BIOSCAVENGER AND METHODS FOR MAKING AND USING THEM
申请人:The Regents of the University of California
公开号:EP3057582A1
公开(公告)日:2016-08-24
Imidazole Aldoximes Effective in Assisting Butyrylcholinesterase Catalysis of Organophosphate Detoxification
作者:Rakesh K. Sit、Valery V. Fokin、Gabriel Amitai、K. Barry Sharpless、Palmer Taylor、Zoran Radić
DOI:10.1021/jm401650z
日期:2014.2.27
Intoxication by organophosphate (OP) nerve agents and pesticides should be addressed by efficient, quickly deployable countermeasures such as antidotes reactivating acetylcholinesterase or scavenging the parent OP. We present here synthesis and initial in vitro characterization of 14 imidazole aldoximes and their structural refinement into three efficient reactivators of human butyrylcholinesterase (hBChE) inhibited covalently by nerve agent OPs, sarin, cyclosarin, VX, and the OP pesticide metabolite, paraoxon. Rapid reactivation of OP-hBChE conjugates by uncharged and nonprotonated tertiary imidazole aldoximes allows the design of a new OP countermeasure by conversion of hBChE from a stoichiometric to catalytic OP bioscavenger with the prospect of oral bioavailability and central nervous system penetration. The enhanced in vitro reactivation efficacy determined for tertiary imidazole aldoximes compared to that of their quaternary N-methyl imidazolium analogues is attributed to ion pairing of the cationic imidazolium with Asp 70, altering a reactive alignment of the aldoxime with the phosphorus in the OP-hBChE conjugate.