Use of PROAST software to assess the influence of decabrominated diphenyl ether and/or cadmium on thyroid hormones homeostasis in rats
Year: 2012
Type: article
Abstract: In relation to commonly used no-observed-adverse-effect-level (NOAEL) point of departure, because of its statistical power and reliability, Benchmark dose (BMD) approach has been proposed as an alternative in dose-response assessment. The aim of this study was to derive BMD (10%) by means of PROAST software to quantify influence of cadmium (Cd) and/or decabrominated diphenyl ether (BDE209) on thyroid hormones homestasis. Study was conducted on male Wistar rats treated orally by gavage for 28 days by either single substances or their combination. Three groups of animals were dosed with Cd at levels of 2.5, 7.5 and 15 mg/kg b.w./day, three groups of animals were dosed with BDE209 at levels of 1000, 2000 or 4000 mg/kg b.w./day, while 9 groups received different dose mixtures of previously given dose levels of Cd and BDE209 (design 3 x 3). Results of the study have indicated that Cd+BDE209 mixtures are likely more potent to disrupt thyroid function than would be expected from the chemicals individually. Derived BMD - lower confidence limits (BMDL), if ratio BMD/BMDL is < 10, were 9.4 mg Cd/kg b.w./day and 2155 mg BDE209/kg b.w./day for the effect on T3; and 6.22 mg Cd/kg b.w./day in the mixture with BDE209 2000 mg/kg b.w./day for the effect on FT3.
Source: SCIndeks
Language: English
Subfield: Health, Toxicology and Mutagenesis
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3169160825