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- W2150147310 abstract "Octamethylcyclotetrasiloxane (D4) is used in selected consumer products and has a potential for human exposure from multiple routes. Here we develop a physiologically based pharmacokinetic (PBPK) model to describe the tissue dosimetry, plasma concentration, and clearance in the rat following inhalation and dermal, oral, and iv exposure. An initial multiroute PBPK model, based on a previously published inhalation PBPK model for D4, provided excellent fits to the observed concentration time course of D4 metabolites in urine and D4 exhalation rate following dermal exposures. However, the pharmacokinetics of D4, following oral and iv exposure, were sensitive to the mode of entry into the blood compartment. A refined model, describing delivery of D4 from the GI tract to the nonexchangeable/deep blood compartment, provided the best fits to observed plasma D4, exhaled D4, and D4 metabolites excreted in the urine following oral exposure. Pharmacokinetics following iv administration was best described by delivery of D4 directly into the deep blood compartment, possibly reflecting a kinetically identifiable characteristic of the administration of D4 as an emulsion for the intravenous route of exposure. This model-based analysis indicates that the pharmacokinetics of D4 delivered by the inhalation or dermal routes is similar, and is different from the iv or oral delivery routes." @default.
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- W2150147310 date "2003-01-01" @default.
- W2150147310 modified "2023-09-23" @default.
- W2150147310 title "Route-Specific Differences in Distribution Characteristics of Octamethylcyclotetrasiloxane in Rats: Analysis Using PBPK Models" @default.
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- W2150147310 doi "https://doi.org/10.1093/toxsci/71.1.41" @default.
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