N-(2-Hydroxyethyl)-l-valyl-l-leucine in rat urine as a hydrolytic cleavage product of ethylene oxide adduct with globin
作者:Jaroslav Mráz、Iveta Hanzlíková、Igor Linhart、Šárka Dušková、Ludmila Dabrowská、Kamil Hejl
DOI:10.1007/s00204-019-02388-8
日期:2019.3
Ethylene oxide (EO), a genotoxic industrial chemical and sterilant, forms covalent adducts with DNA and also with nucleophilic amino acids in proteins. The adduct with N-terminal valine in globin [N-(2-hydroxyethyl)valine (HEV)] has been used in biomonitoring of cumulative exposures to EO. Here we studied in rats the fate of EO-adducted N-termini of globin after life termination of the erythrocytes
环氧乙烷(EO)是一种具有遗传毒性的工业化学品和消毒剂,可与DNA以及蛋白质中的亲核氨基酸形成共价加合物。在球蛋白[N-(2-羟乙基)缬氨酸(HEV)]中具有N末端缬氨酸的加合物已用于生物监测EO的累积暴露量。在这里,我们在大鼠中研究了红细胞寿命终止后,EO加成的球蛋白N末端的命运。将大鼠红细胞与EO孵育,以产生酸性水解后测得的球蛋白HEV水平为0.4-13.2 µmol / g。分离的球蛋白与酶链霉蛋白酶的交替水解得到N-(2-羟乙基)-L-戊基-L-亮氨酸(HEVL)和N-(2-羟乙基)-L-戊基-L-组氨酸(EOV)大鼠球蛋白α-链和β-链的N-末端加成的二肽。HEVL / HEVH之比(1:3)反映了EO与β-链的更高反应性。然后将EO修饰的红细胞静脉内给予接受者的大鼠。发现HEVL和HEVH是大鼠尿液中分泌的最终裂解产物。最后,给大鼠腹膜内给予50mg / kg的EO。在此,与大