NIH Research Festival
TBBPA is currently the world’s highest production volume brominated flame retardant. Humans are frequently exposed to TBBPA by the dermal route. In the present study, a parallelogram approach was used to make predictions of internal dose in exposed humans. Human and rat skin samples received 100 nmol TBBPA/cm2 skin and absorption and penetrance were determined using a flow-through in vitro system. [14C]-radioactivity was determined at 6h intervals in the media and at 24h post-dosing in the skin. Human skin and media contained ~ 3.4% and 0.2% of the total dose at 24h, respectively, while the rat skin and media contained 9.3% and 3.5%, respectively. In the intact rat, 14% of a dermally-administered dose of ~100 nmol/cm2 remained in the skin at the dosing site, with an additional 8% reaching systemic circulation by 24h post-dosing. Relative absorption and penetrance was less (~10%) at 24h following dermal administration of a ten-fold higher dose (~1,000 nmol/cm2) to rats. However, by 72h, 70% of this dose was either absorbed into the dosing-site skin or had reached systemic circulation. It is clear from these results that TBBPA can be absorbed by the skin and dermal contact with TBBPA may represent a small but important route of exposure. Together, these in vitro data in human and rat skin and in vivo data from rats may be used to predict TBBPA absorption in humans following dermal exposure. Based on this parallelogram calculation, up to 6% of dermally applied TBBPA may be bioavailable to humans exposed to TBBPA.
Scientific Focus Area: Chemical Biology
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