Animal Bioresource in Japan
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Influence of Platinum Nanoparticles Orally Administered to Rats Evaluated by Systemic Gene Expression Profiling
Kazuo KATAO1), Reiko HONMA2)3), Satoko KATO2)4), Shinya WATANABE2) and Jun-ichi IMAI2)
1) College of International Relations, Nihon University 2) Department of Clinical Genomics, Translational Research Center (Tokyo Branch), Fukushima Medical University 3) Nippon Gene, Co., Ltd. 4) Medicrome, Inc.
Platinum is recognized as a harmless metal and is widely used in many industrial products. Recent studies have proposed that platinum in the form of nanoparticles has antioxidant properties, suggesting potential uses for platinum nanoparticles as additives in foods and cosmetics, with direct exposure consequences for humans. However, the influence of platinum nanoparticles on humans has not been sufficiently evaluated, thus far. Therefore, to investigate the influence of platinum nanoparticles on a living body, we comprehensively examined the expression profiles of genes obtained from 25 organs and tissues of rats after oral administration of platinum nanoparticles by gavage. Comparative analysis revealed that the expression levels of 18 genes were altered in 12 organs and tissues after the administration (approximately 0.17% of all the genes examined). Of the tissues examined, those of the glandular stomach, whichi were most directly exposed to the orally administered platinum nanoparticles, showed altered expression levels of genes associated with inflammation. In subcutaneous adipose tissue, the expression levels of genes whose products exhibited ATPase activity were altered. Real-time reverse transcription polymerase chain reaction (real-time RT-PCR) analysis confirmed the alteration in the expression levels of these genes in these 2 different tissues. Our findings indicate that orally administered platinum nanoparticles do not have a marked effect on systemic gene expression levels, except on a small number of genes expressed in rat tissues, including peripheral tissues indirectly exposed to the orally administered nanoparticles.
DNA microarray, gene expression profile, nanoparticles, oral administration, platinum
Date Deposited : 21 Jun 2011 11:10
Official URL: http://www.jstage.jst.go.jp/browse/expanim/60/1/_contents
Last Modified : 21 Jun 2011 11:10
Volume 60, Number 1, - 2011
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