INTEGRATED NMR-BASED METABONOMIC INVESTIGATION OF EARLY METABOLIC EFFECTS OF ETHYLENE GLYCOL MONOMETHYL ETHER (EGME) ON MALE REPRODUCTIVE ORGANS IN RATS
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概要
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High-resolution Magic Angle Spinning (Hr-MAS) ^1H-NMR spectroscopy was used to analyze intact testicular tissues ex vivo and to investigate the toxicological effects of ethylene glycol monomethyl ether (EGME), a well-known spermatocytes toxicant, on male reproductive organs by NMR-based metabonomic analysis. Especially, we reported the first Hr-MAS ^1H-NMR spectra of epididymis. Sexually matured male rats were treated with 50 and 2, 000 mg/kg EGME, and body weight, reproductive organs weight, histopathology and plasma biochemistry were examined at 6 and 24 hr after administration. Two multivariate statistical methods, namely, unsupervised PCA and supervised PLS-DA, indicated that the balance of endogenous metabolites was perturbed in both reproductive organs and biofluids. In the testes, lactate, creatine and glutathione were mainly affected by EGME treatment. In urine and plasma, altered excretions of the TCA cycle intermediates (2-oxoglutarate, citrate and succinate) and the ketone-bodies (acetoacetate and β-hydroxybutyrate) were also observed. The finding in current integrated metabonomic analysis of both intact tissues and biofluids suggested that EGME-induced testicular toxicity was attributed to perturbation of the energy supply processes, suppression of the TCA cycle, or oxidative stress. Furthermore, Hr-MAS ^1H-NMR proved useful to investigate the molecular snapshot of biological tissues and the mechanism of toxicity.
- 2007-12-14
著者
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HORII IKUO
Drug Safety Evaluation, Nagoya Laboratories, Pfizer Global Research and Development
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YOSHIDA Takemi
Department of Biochemical Toxicology, School of Pharmacy, Showa University
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Yamamoto Toshinori
Drug Safety Research & Development Pfizer Global Research & Development Nagoya Laboratories
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Horii Ikuo
Drug Safety Research & Development Pfizer Global Research & Development Nagoya Laboratories
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Yoshida Takemi
Department Of Biochemical Toxicology School Of Pharmaceutical Sciences Showa University
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Yoshida Takemi
Department Of Biochemical Toxicology School Of Pharmaceutical Science Showa University
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Yamamoto Toshinori
Drug Safety Research & Development Pfizer Global Research & Development Nagoya Laboratories
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Yamamoto Toshinori
Drug Metabolism Laboratory Chugai Pharmaceutical Co. Ltd.
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Horii Ikuo
Drug Safety Evaluation Pfizer Global Research And Development
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Horii Ikuo
Drug Safety Evaluation Global Research & Development Pfizer Inc.
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