- 著者
- Ken Takeda Ken-ichiro Suzuki Aki Ishihara Miyoko Kubo-Irie Rie Fujimoto Masako Tabata Shigeru Oshio Yoshimasa Nihei Tomomi Ihara Masao Sugamata
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Journal of Health Science (ISSN:13449702)
- 巻号頁・発行日
- vol.55, no.1, pp.95-102, 2009 (Released:2009-02-01)
- 参考文献数
- 31
- 被引用文献数
- 226 272
Nanomaterials are being used increasingly for commercial purposes, yet little is known about the potential health hazards such materials may pose to consumers and workers. Here we show that nano-sized titanium dioxide (TiO2), which is used widely as a photo-catalyst and in consumer products, administered subcutaneously to pregnant mice is transferred to the offspring and affects the genital and cranial nerve systems of the male offspring. Nanoparticles identified as TiO2 by energy-dispersive X-ray spectroscopy were found in testis and brain of exposed 6-week-old male mice. In the offspring of TiO2-injected mice, various functional and pathologic disorders, such as reduced daily sperm production and numerous caspase-3 (a biomarker of apoptosis) positive cells in the olfactory bulb of the brain, were observed. Our findings suggest the need for great caution to handle the nanomaterials for workers and consumers.
- 著者
- Masakazu Umezawa Hitoshi Tainaka Natsuko Kawashima Midori Shimizu Ken Takeda
- 出版者
- The Japanese Society of Toxicology
- 雑誌
- The Journal of Toxicological Sciences (ISSN:03881350)
- 巻号頁・発行日
- vol.37, no.6, pp.1247-1252, 2012-12-01 (Released:2012-12-01)
- 参考文献数
- 25
- 被引用文献数
- 34 40
The production of man-made nanoparticles is increasing in nanotechnology, and health effect of nanomaterials is of concern. We previously reported that fetal exposure to titanium dioxide (TiO2) affects the brain of offspring during the perinatal period. The aim of this study was to extract candidate brain regions of interest using a specific group of Medical Subject Headings (MeSH) from a microarray dataset of the whole brain of mice prenatally exposed to TiO2 nanoparticle. After subcutaneous injection of TiO2 (total 0.4 mg) into pregnant mice on gestational days 6-15, brain tissues were collected from male fetuses on embryonic day 16 and from male pups on postnatal days 2, 7, 14 and 21. Gene expression changes were determined by microarray and analyzed with MeSH indicating brain regions. As a result, a total of twenty-one MeSH were significantly enriched from gene expression data. The results provide data to support the hypothesis that prenatal TiO2 exposure results in alteration to the cerebral cortex, olfactory bulb and some regions intimately related to dopamine systems of offspring mice. The genes associated with the striatum were differentially expressed during the perinatal period, and those associated with the regions related to dopamine neuron system and the prefrontal region were dysregulated in the later infantile period. The anatomical information gave us clues as to the mechanisms that underlie alteration of cerebral gene expression and phenotypes induced by fetal TiO2 exposure.
- 著者
- 小山 晶子 武田 健 Seiko Oyama Ken Takeda
- 雑誌
- 産研論集 (ISSN:02881667)
- 巻号頁・発行日
- no.43, pp.17-27, 2016-03-23