代谢
/其他毒性信息/ 对-二甲苯、对-甲基苄醇(PMBA)和2,5-二甲酚(DMP)的肺部代谢物进行研究,以探讨对-二甲苯对肺和肝脏代谢的不同影响。大鼠每天腹腔注射PMBA、DMP或10% cremophore(对照)连续3天,并在12小时后测定对肝脏和肺泡微粒体代谢的影响。PMBA和DMP都能模拟对-二甲苯之前报道的肺部苄氧基香豆素-O-脱苄酶活性的降低,但都不能解释对肝脏细胞色素P450的强烈诱导。只有PMBA对P450IIB apoprotein水平有持续的影响,降低肝脏和肺部的水平。这些数据表明,PMBA可能在对-二甲苯引起的肺部P450抑制中发挥重要作用。
/OTHER TOXICITY INFORMATION/ Pulmonary metabolites of p-xylene, p-methylbenzyl alcohol (PMBA) and 2,5-dimethylphenol (DMP), were employed to investigate the divergent effects of p-xylene on pulmonary and hepatic metabolism. Rats were given PMBA, DMP, or 10% cremophore (control) ip daily for 3 days, and effects on hepatic and pulmonary microsomal metabolism were determined 12 hours later. Both PMBA and DMP mimic the decrease in pulmonary benzyloxyresorufin-O-debenzylase activity previously reported for p-xylene, but neither could account for the potent induction of cytochrome P450 in the liver. Only PMBA had a consistent effect on P450IIB apoprotein levels, decreasing them in both the liver and lung. These data suggest that PMBA may have a significant role in the inhibition of pulmonary P450 caused by p-xylene.
来源:Hazardous Substances Data Bank (HSDB)