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Behavioral comparison of the oximes TMB-4, 2-PAM, and HI-6 in rats using operant conditioning.

机译:使用操作性条件对大鼠中肟TMB-4、2-PAM和HI-6的行为比较。

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It has recently been shown that oximes can amplify the ability of cholinesterases to scavenge organophosphorus (OP) agents. Since both OP agents and oximes can disrupt performance, behavioral evaluation of bioscavenger therapies using oximes can be hindered. Therefore, we investigated the ability of three oximes, administered alone, to disrupt performance. The effects of trimedoxime bromide (TMB-4) (3.16-56.2 mg/kg), pralidoxime chloride (2-PAM) (10.0-237.1 mg/kg), and, 1-([[4-amincarbonyl)pyridino]-methoxy]-methyl)-2, 4-bis[(hydroxyimino)methyl] pyridinium dichloride monohydrate (HI-6) (10.0-237.1 mg/kg) were evaluated in rats using a variable-interval 56 (VI 56) s schedule of food reinforcement. Under control conditions, the VI 56 s schedule produced a constant rate of responding (i.e., lever-pressing). All three oximes produced dose-dependent decreases in responding, and the largest doses of TMB-4 and 2-PAM produced complete or nearly complete suppression of responding in all rats. Only the largest dose of HI-6 suppressed responding. Analysis of the dose-effect functions demonstrated that TMB-4 was substantially more potent than 2-PAM, which was slightly more potent than HI-6, for producing response suppression. These results establish doses of each oxime that will not contribute to disruption of responding, and thus, facilitate future evaluation of bioscavenger therapies against OP toxicity.
机译:最近显示,肟可以增强胆碱酯酶清除有机磷(OP)剂的能力。由于OP剂和肟均可破坏性能,因此可能会妨碍使用肟对生物清除剂疗法的行为评估。因此,我们研究了单独施用三种肟破坏性能的能力。曲美肟溴(TMB-4)(3.16-56.2 mg / kg),氯吡肟肟(2-PAM)(10.0-237.1 mg / kg)和1-([[4-氨基羰基)吡啶基]-甲氧基的作用使用可变间隔56(VI 56)的食物时间表在大鼠中评估了]-甲基)-2、4-双[(羟基亚氨基)甲基]二氯化吡啶鎓一水合物(HI-6)(10.0-237.1 mg / kg)加强。在控制条件下,VI 56的时间表产生了恒定的响应速度(即,按下操纵杆)。在所有大鼠中,所有三种肟均产生剂量依赖性的反应降低,并且最大剂量的TMB-4和2-PAM产生完全或几乎完全抑制反应。只有最大剂量的HI-6抑制了反应。剂量效应功能的分析表明,TMB-4比2-PAM更有效,后者比HI-6稍强,可产生应答抑制作用。这些结果确定了每种肟的剂量,这些剂量不会导致反应中断,因此有助于将来评估生物清除剂疗法对OP毒性的作用。

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