In vivo and in vitro percutaneous absorption of [14C]pyrene in Sprague Dawley male rats: skin reservoir effect and consequence on urinary 1-OH pyrene excretion

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作者
Jean-Paul Payan
Michel Lafontaine
Patrice Simon
Fabrice Marquet
Catherine Champmartin-Gendre
Dominique Beydon
Elisabeth Ferrari
机构
[1] Institut National de Recherche et de Sécurité,
来源
Archives of Toxicology | 2008年 / 82卷
关键词
Pyrene; 1-Hydroxypyrene; Percutaneous absorption; Skin reservoir; Biomarker;
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摘要
The skin reservoir effect of [14C]pyrene (in vivo and in vitro) on percutaneous absorption was determined in male Sprague Dawley rats. The urinary 1-OHpyrene (1-OHPy) excretion was compared between dermal exposure and intravenous administration. In vivo, the percutaneous absorption flux of [14C]pyrene (200 μg/cm2; 50 μL/cm2 of ethanol) determined by sacrificing batches of rats after different exposure times over 4.5 h was 1.0 ± 0.1 μg/cm2 h−1. During exposure, penetration flux was twofold higher than absorption flux, indicating a gradual accumulation of pyrene in the skin. [14C] skin content at the end of exposure was 16 μg/cm2, which decreased gradually over time to 2 μg/cm2 68 h after the end of exposure. The total absorbed dose during exposure was threefold lower than that after exposure, indicating a high contribution of pyrene skin content to the systemic availability of the compound. Similar results were obtained in vitro. The apparent elimination rate of [14C]pyrene (23 h) contained in the skin after an exposure of 4.5 h was similar to the apparent urinary excretion half life of 1-OHPy (21 h). These values are threefold higher than the urinary excretion half life of 1-OHPy after an intravenous administration of pyrene (0.5 mg/kg). In conclusion, absorbed dose and percutaneous absorption flux were well estimated from the 1-OHPy urinary excretion rate. For risk assessment purposes, the penetration flux rather than the absorption flux should be taken into account for topical pyrene exposure.
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