<i>In Vitro</i> Transformation of Chlorinated Parabens by the Liver S9 Fraction: Kinetics, Metabolite Identification, and Aryl Hydrocarbon Receptor Agonist Activity
作者:Masanori Terasaki、Takeshi Wada、Satoshi Nagashima、Masakazu Makino、Hiro Yasukawa
DOI:10.1248/cpb.c15-00977
日期:——
We investigated the kinetics of in vitro transformation of a dichlorinated propyl paraben (2-propyl 3,5-dichloro-4-hydroxybenzoate; Cl2PP) by the rat liver S9 fraction and assessed the aryl hydrocarbon receptor (AhR) agonist activity of the metabolite products identified in HPLC and GC/MS analysis and by metabolite syntheses. The results indicated that the chlorination of Cl2PP reduced its degradation rate by approximately 40-fold. Two hydroxylated metabolite products showed AhR agonist activity of up to 39% of that of the parent Cl2PP when assessed in a yeast (YCM3) reporter gene assay. The determination of the metabolic properties of paraben bioaccumulation presented here provides further information on the value of risk assessments of chlorinated parabens as a means to ensure human health and environmental safety.
我们研究了二氯丙酯(2-丙基-3,5-二氯-4-羟基苯甲酸;Cl2PP)在大鼠肝脏S9组分体外转化中的动力学过程,并通过高效液相色谱(HPLC)和气相色谱/质谱(GC/MS)分析以及代谢物合成,评估了鉴定出的代谢物的芳香烃受体(AhR)激动活性。结果表明,氯化作用使得Cl2PP的降解速率降低了约40倍。两种羟基化代谢物在酵母(YCM3)报告基因分析中展现出高达母体Cl2PP 39%的AhR激动活性。此处对对羟基苯甲酸酯生物积累的代谢特性的测定,为进一步评估氯化对羟基苯甲酸酯在确保人类健康和环境安全方面的风险价值提供了更多信息。