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Physiologically based pharmacokinetic models for the transport of trichloroethylene in adipose tissue

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Abstract

In this paper we present three physiologically based pharmacokinetic (PBPK) models for the systemic transport of trichloroethylene (TCE), with a focus on the adipose, or fat tissue. TCE is a widespread environmental contaminant, and has been shown to produce toxic effects in both animals and humans. A key characteristic of TCE is its tendency to accumulate in fat tissue, which has a major impact on the overall systemic disposition of TCE.

Here we use PBPK models to predict the dynamics of TCE in the various tissues and organs, including the adipose tissue. The first model utilizes the standard ‘perfusion-limited’ compartmental model for the fat tissue, while the second model uses a ‘diffusion-limited’ model to describe the transport through the adipose tissue. Both of these ODE models are based on ‘well-mixed’ and rapid equilibrium assumptions, and do not take into account the specific and largely heterogeneous physiology of adipose tissue.

The third model we discuss is a PBPK hybrid model with an axial-dispersion type model for the adipose tissue. This PDE-based model is designed to capture key physiological heterogeneities of fat tissue, including widely varying fat cell sizes, lipid distribution, and blood flow properties. Model simulations demonstrate that this model may be well-suited to predict the experimental behavior of TCE in adipose tissue using parameter estimation techniques.

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Authors and Affiliations

  1. Air Force Research Laboratory, Brooks Air Force Base, San Antonio, TX, 78235, USA

    R. A. Albanese & L. K. Potter

  2. Center for Research in Scientific Computation, North Carolina State University, Raleigh, NC, 27695-8205, USA

    H. T. Banks

  3. National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, USA

    M. V. Evans

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  1. R. A. Albanese
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  2. H. T. Banks
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  3. M. V. Evans
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  4. L. K. Potter
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Albanese, R.A., Banks, H.T., Evans, M.V. et al. Physiologically based pharmacokinetic models for the transport of trichloroethylene in adipose tissue. Bull. Math. Biol. 64, 97–131 (2002). https://doi.org/10.1006/bulm.2001.0268

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