Development of a physiologically based pharmacokinetic model for perchloroethylene using tissue concentration-time...

Area of Science:

• Toxicology
• Pharmacokinetics
• Computational Biology

Background:

• Perchloroethylene (PCE) is an industrial solvent with potential health risks.
• Understanding PCE tissue distribution is crucial for accurate risk assessment.
• Physiologically based pharmacokinetic (PBPK) models require robust in vivo data for parameterization.

Purpose of the Study:

• To experimentally determine perchloroethylene (PCE) tissue disposition in rats.
• To derive input parameters for a physiologically based pharmacokinetic (PBPK) model using in vivo data.
• To validate the PBPK model's predictions of PCE tissue deposition after inhalation exposure.

Main Methods:

• Rats received intravenous (IV) perchloroethylene (PCE) or inhaled 500 ppm PCE.
• Serial blood and tissue samples (brain, liver, kidney, lung, heart, muscle, fat) were collected up to 72 hours post-exposure.
• PCE concentrations were analyzed using gas chromatography headspace; PBPK model parameters were calculated from these data.

Main Results:

• Tissues exhibited similar terminal elimination half-lives following IV administration, suggesting blood-flow-limited distribution.
• Tissue:blood partition coefficients and in vivo metabolic rate constants were calculated.
• The developed PBPK model accurately predicted measured PCE tissue concentrations during and after inhalation exposure.

Conclusions:

• In vivo tissue disposition data are essential for accurate PBPK model development and validation.
• The PBPK model successfully predicted PCE tissue deposition, aiding in risk assessment.
• This approach provides a reliable method for simulating chemical exposure and tissue accumulation.