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Enhanced Inhibitory Effects of TBT Chloride on the Development of F1 Rats

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Abstract

Neurotoxicity is one of the major effects of tributyltin (TBT). The effects on the next generation of F1 rats exposed to TBT via the placenta and their dams’ milk may be stronger than those on adults. Pregnant Wister rats were exposed to TBT at 0 and 125 ppm in their food. Half of the female F1 rats in both groups were exposed to TBT at 125 ppm in their food from 9 to 15 weeks of age. Female F1 rats were divided into the following groups: the control-control (CC) group, with no exposure; the TBT-control (TC) group, exposed to TBT via the placenta and their dams’ milk; the control-TBT (CT) group, exposed to TBT via their food from 9 to 15 weeks of age; and the TBT-TBT (TT) group, exposed to TBT via the placenta, their dams’ milk, and their food (n = 10/group). After administration, an open-field test and prepulse inhibition (PPI) test were performed at 15 weeks of age. The mean body weights of the TC and TT groups were significantly lower than that of the CC group from 9 to 15 weeks of age. The mean relative thymus weight of the TC and TT groups was significantly lower than that of the CC group. In the open-field test, a marked decrease in the total locomotion distance was observed in the TT group. The mean values in the TT and TC groups were significantly lower than that in the CC group. For the locomotion distance between 15 and 20 min, the mean values in the CT, TC, and TT groups were significantly lower than that in the CC group. The mean locomotor distance between 25 and 30 min in the TT group was significantly lower than that in the CC and TC groups. The mean values of instances of wall rearing in the TC, CT, and TT groups were significantly lower than that in the CC group. The mean value of face washing or body washing in the TT group was significantly lower than that in the CT group. There were no significant differences in indexes of the PPI test. Exposure to TBT via the placenta and their dams’ milk inhibited the development of F1 rats, which continued after weaning. Inhibition of the rats’ activity induced by exposure to TBT via the placenta and their dams’ milk and/or via their food was suggested. The effects were most evident in the TT group.

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Acknowledgments

We thank Professor Hiroshi Yamauchi, Department of Public Health, Kitasato University School of Allied Sciences, for his assistance. We thank Mr. Robert E. Brandt for editing the manuscript. This study was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Department of Preventive Medicine and Public Health, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara, Kanagawa, 228-8555, Japan

    H. Asakawa, M. Tsunoda, T. Kaido, M. Hosokawa, C. Sugaya, Y. Inoue, Y. Kudo & Y. Aizawa

  2. Department of Public Health, Kitasato University School of Allied Health Sciences, Sagamihara, Kanagawa, Japan

    H. Asakawa & H. Katagiri

  3. Kitasato Clinical Research Center, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan

    T. Satoh

  4. Department of Physiology, Kitasato University School of Allied Health Sciences, Sagamihara, Kanagawa, Japan

    H. Akita & M. Saji

  5. Aoyama Gakuin University School of Science and Engineering, Sagamihara, Kanagawa, Japan

    M. Wakasa, T. Negishi & T. Tashiro

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  1. H. Asakawa
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  2. M. Tsunoda
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  3. T. Kaido
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  4. M. Hosokawa
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  5. C. Sugaya
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  6. Y. Inoue
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  7. Y. Kudo
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  8. T. Satoh
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  9. H. Katagiri
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  10. H. Akita
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  11. M. Saji
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  12. M. Wakasa
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  13. T. Negishi
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  14. T. Tashiro
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  15. Y. Aizawa
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Correspondence to M. Tsunoda.

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Asakawa, H., Tsunoda, M., Kaido, T. et al. Enhanced Inhibitory Effects of TBT Chloride on the Development of F1 Rats. Arch Environ Contam Toxicol 58, 1065–1073 (2010). https://doi.org/10.1007/s00244-009-9421-9

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  • DOI: https://doi.org/10.1007/s00244-009-9421-9

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