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Systemic and myelotoxic effects of single administration of 2,3,7,8-tetrabromodibenzo-p-dioxin in rats

Environmental Health and Preventive Medicine volume 11, pages 136–144 (2006)Cite this article

Abstract

Objective

Systemic and myelotoxic effects of 2,3,7,8-tetrabromodibenzo-p-dioxin (TBDD) were examined by the single administration of TBDD by gavage to rats.

Methods

Fifteen Wistar rats of both sexes per group received 0, 10, 30, 100 or 300 μg TBDD/kg body weight. Rats surviving to the scheduled necropsy on Days 2, 7 and 36 after TBDD administration were examined for growth rate, organ weight, hematology, histopathology and adipose tissue levels of TBDD.

Results

Three 300 μg/kg-dosed females died on Days 21, 23 and 27, and exhibited a marked decrease in body weight, severe thymic atrophy, decreased bone marrow hematopoiesis and hemorrhage in the subarachnoid space of brain and spinal cord. TBDD-dosed surviving rats exhibited growth retardation, decreased bone marrow hematopoiesis, decreases in red blood cell counts, hemoglobin concentrations, and hematocrit values, an increase in reticulocytes and decreases in platelet counts, white blood cell counts and eosinophils. These signs suggested TBDD myelotoxicity. Splenic extramedullary hematopoiesis was increased in both sexes given TBDD, whereas atrophy of the splenic white pulp occurred only in TBDD-dosed females. Marked decreases in body weights and the size and weight of the thymus, severe thymic atrophy and death in TBDD-dosed females suggested a wasting syndrome. The adipose tissue level of TBDD culminated on Day 7 and decreased to 20–30% of the Day 7 level on Day 36.

Conclusions

The TBDD-induced effects were characterized by a wasting syndrome and myelotoxicity that appeared at the dose levels of 30 μg/kg and higher and caused death in 300 μg/kg-dosed females.

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Authors and Affiliations

  1. Japan Bioassay Research Center, Japan Industrial Safety and Health Association, 2445 Hirasawa, 257-0015, Hadano, Kanagawa, Japan

    Seigo Yamamoto, Kasuke Nagano, Hideki Senoh, Tetsuya Takeuchi, Michiharu Matsumoto, Hisao Ohbayashi, Tadashi Noguchi, Kazunori Yamazaki, Heihachiro Arito & Taijiro Matsushima

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  1. Seigo Yamamoto
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  2. Kasuke Nagano
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  3. Hideki Senoh
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  4. Tetsuya Takeuchi
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Correspondence to Seigo Yamamoto.

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Yamamoto, S., Nagano, K., Senoh, H. et al. Systemic and myelotoxic effects of single administration of 2,3,7,8-tetrabromodibenzo-p-dioxin in rats. Environ. Health Prev. Med. 11, 136–144 (2006). https://doi.org/10.1265/ehpm.11.136

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Environmental Health and Preventive Medicine

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