Acetylcholinesterase prophylaxis against organophosphate poisoning. Quantitative correlation between protection and blood-enzyme level in mice.

Abstract:

:Fetal bovine serum acetylcholinesterase (FBS-AChE, EC 3.1.1.7) was titrated, both in vitro and in vivo, with a highly toxic anti-ChE organophosphate, 7-(methylethoxyphosphinyloxy)-1-methyl-quinolinium iodie (MEPQ). Approximately 1:1 stoichiometry was obtained for the sequestration of MEPQ by FBS-AChE in mice. A quantitative, linear correlation was demonstrated between blood-AChE levels and the protection afforded by exogenously administered AChE in mice when challenged with anti-ChE MEPQ. The results presented in this report demonstrate that such prophylactic measures are indeed sufficient to protect animals against poisoning by as high as an 8 x LD50 dose of organophosphate without the administration of any supportive drug. Despite the relatively large toxic dose, most of the mice that survived the challenge did not show any classical clinical signs of severe anti-ChE poisoning. MEPQ may be considered a suitable model compound for studying the quantitative aspects of the scavenger prophylactic approach described here.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Raveh L,Ashani Y,Levy D,De La Hoz D,Wolfe AD,Doctor BP

doi

10.1016/0006-2952(89)90394-8

subject

Has Abstract

pub_date

1989-02-01 00:00:00

pages

529-34

issue

3

eissn

0006-2952

issn

1873-2968

pii

0006-2952(89)90394-8

journal_volume

38

pub_type

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