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Chronic Inhalation Toxicity of 1,2-Dibromoethane in Rats. With and Without Dietary Disulfiram.

Authors
Wong-LC; Winston-JM; Hong-CB; Hagensen-J
Source
NIOSH 1980 Nov:36 pages
Link
NIOSHTIC No.
00171099
Abstract
The effects of chronic exposure to 20 parts per million (ppm) 1,2- dibromoethane (106934) (EDB) were studied in Sprague-Dawley-rats. Male and female rats were exposed to EDB for 7 hours/day, 5 days/week for 18 months; some rats were also given a diet containing disulfiram resulted in most of the rats dying or being terminated during the first 12 months; all rats in this group died or were terminated by the fifteenth month. The group receiving EDB alone had higher mortality than a control group or a group receiving disulfiram alone. Body weight was depressed in the EDB/disulfiram group to a greater extent than in the EDB group. The EDB/disulfiram group showed a significant increase in the incidence of tumors of the liver and mesentery, compared to the group receiving EDB alone. EDB/disulfiram resulted in a tenfold increase in hepatocellular carcinoma, compared to EDB alone. Testicular atrophy was found in 88 percent of the EDB/disulfiram males, but in only 2 percent of EDB males. Histopathologic changes were observed in nasal cavities of rats treated with EDB or EDB/disulfiram. The authors conclude that inhalation of EDB at 20ppm under simulated occupational conditions exerts a carcinogenic effect; addition of disulfiram to the diet enhances the toxicity and carcinogenicity of EDB, and results in additional effects.
Keywords
NIOSH-Contract; Contract-210-76-0131; Brominated-ethanes; Laboratory-animals; Chronic-exposure; Carcinogens; Reproductive-system-disorders; Sex-factors;
CAS No.
106-93-4; 97-77-8;
Publication Date
19801101
Funding Type
Contract;
Fiscal Year
1981
NTIS Accession No.
PB87-234811
NTIS Price
A04
Identifying No.
Contract-210-76-0131
NIOSH Division
DBBS;
Priority Area
Fertility and Pregnancy Abnormalities; Disease and Injury; Reproductive-system-disorders; Special Populations; Work Environment and Workforce;
Source Name
Division of Biomedical and Behavioral Science, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio
State
OH;
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