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A physiologic pharmacokinetic model for styrene and styrene-7,8-oxide in mouse, rat and man

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Abstract

Concern about the carcinogenic potential of styrene (ST) is due to its reactive metabolite, styrene-7,8-oxide (SO). To estimate the body burden of SO resulting from various scenarios, a physiologically based pharmacokinetic (PBPK) model for ST and its metabolite SO was developed. This PBPK model describes the distribution and metabolism of ST and SO in the rat, mouse and man following inhalation, intravenous (i.v.), oral (p.o.) and intraperitoneal (i.p.) administration of ST or i.v., p.o. and i.p. administration of SO. Its structure includes the oxidation of ST to SO, the intracellular first-pass hydrolysis of SO catalyzed by epoxide hydrolase and the conjugation of SO with glutathione. This conjugation is described by an ordered sequential ping-pong mechanism between glutathione, SO and glutathioneS-transferase. The model was based on a PBPK model constructed previously to describe the pharmacokinetics of butadiene with its metabolite butadiene monoxide. The equations of the original model were revised to refer to the actual tissue concentration of chemicals instead of their air equivalents used originally. Blood: air and tissue: blood partition coefficients for ST and SO were determined experimentally and have been published previously. Metabolic parameters were taken from in vitro or in vivo measurements. The model was validated using various data sets of different laboratories describing pharmacokinetics of ST and SO in rodents and man. In addition, the influences of the biochemical parameters, alveolar ventilation and blood: air partition coefficient for ST on the pharmacokinetics of ST and SO were investigated by sensitivity analysis. The PBPK model presented can be used to predict concentration-time curves of ST or SO in blood and different tissues.

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Author notes

  1. J. G. Filser

    Present address: Central Research Institute of Chemistry, Hungarian Academy of Sciences, Budapest, Hungary

Authors and Affiliations

  1. GSF-Institut für Toxikologie, Neuherberg, Ingolstädter Landstraße 1, D-85764, Oberschleißheim, Germany

    Gy. A. Csanády & J. G. Filser

  2. Toxicology Research Laboratory, Health and Environmental Sciences, Dow Chemical Company, Midland, Michigan, USA

    A. L. Mendrala & R. J. Nolan

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  1. Gy. A. Csanády
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  2. A. L. Mendrala
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  3. R. J. Nolan
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  4. J. G. Filser
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Csanády, G.A., Mendrala, A.L., Nolan, R.J. et al. A physiologic pharmacokinetic model for styrene and styrene-7,8-oxide in mouse, rat and man. Arch Toxicol 68, 143–157 (1994). https://doi.org/10.1007/BF03035414

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  • DOI: https://doi.org/10.1007/BF03035414

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