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Computer simulation of the lactational transfer of tetrachloroethylene in rats using a physiologically based model.

Abstract：

:A physiologically based pharmacokinetic (PBPK) model describing transfer of inhaled tetrachloroethylene (PCE) into breast milk with the consequent exposure of the nursing pups was developed and validated in lactating rats. The PBPK model was based on partition coefficients (PCs), which were determined by the equilibration of tissues with known concentrations of PCE vapor. The blood/air and milk/blood PCs for the dam were 33.5 and 12.0, the liver/blood and fat/blood PCs for the dam were 1.9 and 42.4, and the slowly perfused tissues/blood and rapidly perfused tissues/blood PCs for the dam were 0.9 and 1.7, respectively. The blood/air PC for the pup was 24.3, and the solid tissues/blood PC for the pup was 4.5. Metabolic constants were determined by a gas uptake method. The pseudo-maximal velocity of PCE metabolism in the dam was low, 0.03 mg/kg/hr, and the apparent Michaelis-Menten constant was 0.3 mg/liter. The lactating Sprague-Dawley females were exposed to PCE vapor for 2 hr with concentrations ranging from 20 to 1000 ppm PCE. The dams were returned to the pups after exposure and the pups received PCE via breast milk while they nursed. PCE concentrations in the air, blood, milk, and tissues were determined by gas chromatography and compared to PBPK model predictions. Nursing resulted in a peak pup blood PCE concentration of 0.9 mg/liter and a peak pup solid tissue PCE concentration of 8 mg/kg. The PBPK lactation model adequately described the distribution of inhaled PCE in maternal blood and milk, as well as in the nursed pup's gastrointestinal tract, blood, and solid tissues. It is concluded that the predictions based on PBPK modeling for disposition of PCE in lactating rats and their pups were in good agreement with the experimental data.

journal_name

Toxicol Appl Pharmacol

journal_title

Toxicology and applied pharmacology

authors

Byczkowski JZ,Kinkead ER,Leahy HF,Randall GM,Fisher JW

doi

10.1006/taap.1994.1068

subject

Has Abstract

pub_date

1994-04-01 00:00:00

pages

228-36

issue

2

eissn

0041-008X

issn

1096-0333

pii

S0041-008X(84)71068-4

journal_volume

125

pub_type

杂志文章

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