Characterization of the contribution of buccal absorption to internal exposure to bisphenol A through the diet. (July 2016)

• Record Type: Journal Article
• Authors: Guignard, Davy; Gauderat, Glenn; Gayrard, Véronique; Lacroix, Marlène Z.; Picard-Hagen, Nicole; Puel, Sylvie; Toutain, Pierre-Louis; Viguié, Catherine
• Is Part Of: Food and chemical toxicology. Volume 93(2016)
• Page Start: 82
• Page End: 88
• Publication Date: 2016-07
• Subjects: Bisphenol A -- Food toxicology -- Pharmacokinetic -- Buccal absorption; AUC Area under the curve -- BPA Bisphenol A -- BPA-G Bisphenol A glucuronide -- LOQ Limit of quantification; Toxicology -- Periodicals; Food poisoning -- Periodicals; Food Poisoning -- Periodicals; Toxicology -- Periodicals; Toxicologie -- Périodiques; Intoxications alimentaires -- Périodiques; Food poisoning; Toxicology; Periodicals; Electronic journals; 615.9
• DOI: 10.1016/j.fct.2016.04.004
• Languages: English
• ISSNs: 0278-6915

Abstract

Abstract: The gavage route is often used for the toxicological evaluation of food contaminants. This route does not take into account absorption of the toxicants through the buccal mucosa, as evidenced in dogs for bisphenol A (BPA). Our goal was to determine the functional significance of buccal BPA absorption during dietary exposure. Four ewes received BPA by nasogastric gavage (100 mg/kg) and through food pellets (10 mg/kg), 13 days apart. The time course of serum concentrations of BPA and its main metabolite BPA-G was submitted to non-compartmental analysis. The dietary route led to 3-fold higher bioavailability as compared to gavage. The ratio of BPA-G to BPA concentrations varied greatly over time after the food administration, but not after gavage, suggesting a delayed metabolism of BPA after dietary exposure. The maximum entrance rate of BPA in the systemic circulation, determined by deconvolution analysis, was much higher after dietary administration than after gavage and a biphasic pattern of BPA entry was observed in 3 of the 4 ewes. Our results evidenced a dual mechanism of BPA absorption (buccal and digestive) after dietary exposure and highlight the necessity to take buccal absorption into account when evaluating food contaminants. Graphical abstract: Highlights: Dietary exposure to bisphenol A (BPA) leads to a dual mechanism of absorption. BPA is first submitted to a buccal absorption then to a digestive one. Buccal absorption bypasses the hepatic first-pass effect. Buccal absorptions leads to higher internal exposure to BPA. Buccal absorption should be considered for the evaluation of food pollutants.