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首页> 外文期刊>Journal of applied toxicology >Intravenous pyruvic acid application in minipigs partially protects acetylcholine-esteratic but not butyrylcholine-esteratic activity in plasma from inhibition by paraoxon.
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Intravenous pyruvic acid application in minipigs partially protects acetylcholine-esteratic but not butyrylcholine-esteratic activity in plasma from inhibition by paraoxon.

机译:在小型猪中静脉注射丙酮酸可部分保护血浆中的乙酰胆碱酯化活性,但不能保护丁酰胆碱酯化活性不受对氧磷的抑制。

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摘要

Intoxications with organophosphorus compounds such as paraoxon (POX) are frequent. Oximes are the only enzyme reactivators clinically available. In vitro and in vivo studies have shown that l-lactate reduces the inhibition of plasma acetylcholine-esteratic activity (AChEA) (in vitro and in vivo) and plasma butyrylcholine-esteratic activity (BChEA) (at least in vitro and possibly in vivo) by POX. However, a short infusion of 10 g of lactate was unable to elevate the plasma lactate level for >3 h. In this study we tested a substance related to l-lactate, i.e. pyruvic acid. The purpose of this animal experimental study (female minipigs with historical control group) was to determine in vivo whether intravenous (i.v.) pyruvic acid application under normoxicormocapnicormohydrogenaemic conditions is able to elevate blood lactate levels and whether it is able to protect AChEA and BChEA from POX inhibition. Animals were anaesthetized, intubated and mechanically ventilated. Each received 1 mg kg(-1) body wt. of POX in 50 ml of saline over 50 min and 10 g (ca. 0.5 g kg(-1) body wt.) of i.v. pyruvic acid in 50 ml of saline over 50 min. They were compared with a historical control group of six animals that received only 1 mg kg(-1) body wt. of POX in 50 ml of saline over 50 min. In central venous blood measurements of plasma AChEA and BChEA, the measurements were performed before (baseline), immediately after POX (50 min after start) and 110, 170, 230, 290, 530 and 1010 min after the start of infusion. A 10 g aliquot of i.v. pyruvic acid had a statistically significant protective effect in vivo on AChEA but not on BChE activity. Further study of the in vivo effects of pyruvic acid and l-lactate after paraoxon intoxication and a formal comparison with standard oxime therapy seems warranted. Also, a combination therapy with l-lactate and pyruvic acid in vivo should be investigated.
机译:有机磷化合物如对氧磷(POX)经常引起中毒。肟是临床上唯一可用的酶活化剂。体外和体内研究表明,l-乳酸降低了对血浆乙酰胆碱酯酶活性(AChEA)(体外和体内)和血浆丁酰胆碱酯酶活性(BChEA)的抑制(至少在体外和体内)通过POX。但是,短时间输注10 g乳酸不能在3 h以上升高血浆乳酸水平。在这项研究中,我们测试了一种与l-乳酸有关的物质,即丙酮酸。这项动物实验研究(带有历史对照组的雌性迷你猪)的目的是确定体内在常氧/正碳酸/正氢透氧条件下静脉内(iv)丙酮酸的施用是否能够提高血液中的乳酸水平以及是否能够保护AChEA和BChEA抑制POX。对动物进行麻醉,插管和机械通气。每个人接受1 mg kg(-1)体重。 50分钟内将50毫升盐水中的POX和10克(约0.5克kg(-1)体重)的i.v.在50分钟内于50 ml盐水中加入丙酮酸。将它们与仅接受1 mg kg(-1)体重的六只动物的历史对照组进行比较。在50分钟内将50毫升盐水中的POX稀释。在血浆AChEA和BChEA的中心静脉血测量中,在POX之前(基线),POX之后(开始后50分钟)和输注开始后110、170、230、290、530和1010分钟进行测量。 i.v.的10克等分试样丙酮酸在体内对AChEA具有统计学上的显着保护作用,但对BChE活性无统计学意义。似乎有必要进一步研究对氧磷中毒后丙酮酸和L-乳酸的体内作用,并与标准肟疗法进行正式比较。同样,应该研究在体内使用l-乳酸和丙酮酸的联合疗法。

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