Effects of skin region and relative lipophilicity on percutaneous absorption in the toad Rhinella marina

Llewelyn, Victoria K., Berger, Lee, and Glass, Beverley D. (2019) Effects of skin region and relative lipophilicity on percutaneous absorption in the toad Rhinella marina. Environmental Toxicology and Chemistry, 38 (2). pp. 361-367.

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Owing to the dynamic interaction between frog skin and the environment, xenobiotics in frog habitats are of particular concern, and knowledge of percutaneous absorption in frog skin is necessary for risk-mitigation purposes. Baseline transdermal kinetics in adult aquatic and arboreal frog species have recently been reported; however, there is little information regarding absorption kinetics in adult terrestrial species. The present study investigated the in vitro absorption kinetics of 3 model chemicals-caffeine, benzoic acid, and ibuprofen-through different skin regions in the terrestrial toad Rhinella marina. Caffeine flux was consistently higher than that of the other 2 chemicals (p < 0.001), whereas the fluxes of the moderately and highly lipophilic chemicals (benzoic acid and ibuprofen) were similar, regardless of skin region. When considering individual chemicals, caffeine demonstrated increased flux through the ventral pelvic skin compared with the ventral thoracic or dorsal skin regions. Flux did not differ between skin regions for either benzoic acid or ibuprofen. These findings have implications for management of environmental contamination in frog habitats, as many environmental xenobiotics are of moderate to high lipophilicity and would be expected to be equally absorbed from all skin surfaces in terrestrial toads.

Item ID: 57155
Item Type: Article (Research - C1)
ISSN: 1552-8618
Keywords: absorption, amphibians, octanol-water partition coefficient, toxicokinetics, wildlife toxicology, skin
Copyright Information: © 2018 SETAC.
Date Deposited: 20 Feb 2019 07:31
FoR Codes: 31 BIOLOGICAL SCIENCES > 3109 Zoology > 310907 Animal physiological ecology @ 100%
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