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Comparative liver metabolic enzyme activity of cytochrome P450 and glutathione-S-transferase in crocodile (Crocodylus siamensis) and livestock.
Comparative Biochemistry and Physiology C: Toxicology & Pharmacology ( IF 3.9 ) Pub Date : 2020-05-05 , DOI: 10.1016/j.cbpc.2020.108784
Piriyaporn Thiendedsakul 1 , Prapassorn Boonsoongnern 2 , Prakorn Jara 3 , Phitsanu Tulayakul 4
Affiliation  

This study aimed to compare the metabolism of detoxification liver enzymes activity of CYP1A2, CYP2E1, the GST enzymes activity for class pi, mu, alfa, and the universal GST between crocodile and livestock, plus the relationship of these two enzyme activities in the crocodile. Interestingly, the CYP1A2 and CYP2E1 were existent in the freshwater crocodile livers microsomal enzyme activities, and these two enzymes could be determined in both pig and chicken. Also, the universal GST, alpha, mu, and pi class of phase II were presented in the crocodile liver cytosolic fractions, and these three enzymes could also be found in pig and chicken. The kinetic activity (Vmax/Km ratio) of GST activity towards CDNB was higher in the crocodile than chicken, and pig; 80.02, 57.80 and 45.25 ml/min/mg protein, respectively. The Vmax/Km ratio GST activity towards t-PBO was highest in crocodile. In contrast, the GST activity towards EA was highest in pig, chicken and crocodile in this order. However, the Vmax/Km ratio GST activity towards CHP was very low in all species. The crocodile liver microsome fraction could metabolites AFB1 to AFM1, suggesting that the CYP1A2 activity was actively presented. The kinetic enzyme activity of crocodile liver towards CDNB revealed the highest velocity compared with other livestock species; this indicates that crocodile liver enzyme activities were very active for the detoxification function towards all xenobiotic, especially for GST activity, towards carcinogenic agent when compared with other livestock.

中文翻译:

比较在鳄鱼(Crocodylus siamensis)和家畜中细胞色素P450和谷胱甘肽-S-转移酶的肝脏代谢酶活性。

本研究旨在比较CYP1A2,CYP2E1的解毒肝酶代谢,pi,mu,alfa类的GST酶活性以及鳄鱼和家畜之间的通用GST,以及鳄鱼中这两种酶活性之间的关系。有趣的是,CYP1A2和CYP2E1存在于淡水鳄鱼肝微粒体酶活性中,而这两种酶在猪和鸡中均可测定。同样,在鳄鱼肝细胞溶质组分中存在II期通用的GST,α,mu和pi类,这三种酶也可以在猪和鸡中发现。在鳄鱼中,GST对CDNB的动力学活性(Vmax / Km比)高于鸡和猪。蛋白质分别为80.02、57.80和45.25 ml / min / mg。在鳄鱼中,针对t-PBO的Vmax / Km比GST活性最高。相反,猪,鸡和鳄鱼对EA的GST活性最高。然而,在所有物种中,对CHP的Vmax / Km比GST活性非常低。鳄鱼肝微粒体组分可以将AFB1代谢为AFM1,提示CYP1A2活性是活跃的。鳄鱼肝对CDNB的动酶活性比其他牲畜物种最高。这表明与其他牲畜相比,鳄鱼肝酶活性对所有异物的排毒功能非常有效,尤其是对致癌剂的GST活性。然而,在所有物种中,对CHP的Vmax / Km比GST活性非常低。鳄鱼肝微粒体组分可以将AFB1代谢为AFM1,这表明CYP1A2活性是活跃的。鳄鱼肝对CDNB的动酶活性比其他牲畜物种最高。这表明,与其他牲畜相比,鳄鱼肝酶活性对于所有异物的排毒功能非常有效,尤其是对致癌剂的GST活性。然而,在所有物种中,对CHP的Vmax / Km比GST活性非常低。鳄鱼肝微粒体组分可以将AFB1代谢为AFM1,这表明CYP1A2活性是活跃的。鳄鱼肝对CDNB的动酶活性比其他牲畜物种最高。这表明与其他牲畜相比,鳄鱼肝酶活性对所有异物的排毒功能非常有效,尤其是对致癌剂的GST活性。鳄鱼肝对CDNB的动酶活性比其他牲畜物种最高。这表明,与其他牲畜相比,鳄鱼肝酶活性对于所有异物的排毒功能非常有效,尤其是对致癌剂的GST活性。鳄鱼肝对CDNB的动酶活性比其他牲畜物种最高。这表明与其他牲畜相比,鳄鱼肝酶活性对所有异物的排毒功能非常有效,尤其是对致癌剂的GST活性。
更新日期:2020-05-05
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