Dose-response modeling and benchmark calculations from spontaneous behavior data on mice neonatally exposed to 2,2',4,4',5-pentabromodiphenyl ether.
In this paper the benchmark dose (BMD) method was introduced for spontaneous behavior data observed in 2-, 5-, and 8-month-old male and female C57Bl mice exposed orally on postnatal day 10 to different doses of 2,2',4,4',5-pentabromodiphenyl ether (PBDE 99). Spontaneous behavior (locomotion, rearing, and total activity) was in the present work quantified in terms of a fractional response defined as the cumulative response after 20 min divided by the cumulative response produced over the whole 1-h test period. The fractional response contains information about the time-response profile (which differs between the treatment groups) and has appropriate statistical characteristics. In the analysis, male and female mice could be characterized by a common dose-response model (i.e., they responded equally to the exposure to PBDE 99). As a primary approach, the BMD was defined as the dose producing a 5 or 10% change in the mean fractional response. According to the Hill model, considering a 10% change the lower bound of the BMD for rearing, locomotion, and total activity was 1.2, 0.85, and 0.31 mg PBDE 99/kg body weight, respectively. A probability-based procedure for BMD modeling was also considered. Using this methodology, the BMD was defined as corresponding to an excess risk of 5 or 10% of falling below cutoff points representing adverse levels of fractional response.
Sand
Salomon
S
Institute of Environmental Medicine, Karolinska Institutet, P.O. Box 210, 17177 Stockholm, Sweden. Salomon.Sand@imm.ki.se
von Rosen
Dietrich
D
Eriksson
Per
P
Fredriksson
Anders
A
Viberg
Henrik
H
Victorin
Katarina
K
Filipsson
Agneta Falk
AF
D000465:Algorithms; D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D001522:Behavior, Animal / Q000187:drug effects*; D003627:Data Interpretation, Statistical; D004305:Dose-Response Relationship, Drug; D005260:Female; D055768:Halogenated Diphenyl Ethers; D006842:Hydrocarbons, Brominated / Q000633:toxicity*; D007700:Kinetics; D016013:Likelihood Functions; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D015233:Models, Statistical; D009043:Motor Activity / Q000187:drug effects; D010647:Phenyl Ethers / Q000633:toxicity*; D011075:Polybrominated Biphenyls; D018675:Toxicity Tests / Q000592:standards* / Q000706:statistics & numerical data
D055768:Halogenated Diphenyl Ethers; D006842:Hydrocarbons, Brominated; D010647:Phenyl Ethers; D011075:Polybrominated Biphenyls; C086401:pentabromodiphenyl ether