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The Ability of Edible Mushrooms to Act as Biocatalysts: Preparation of Chiral Alcohols Using Basidiomycete Strains

Advances in Microbiology 2012年第2期2卷 66-71页

作者： Kohji Ishihara yukiko nishikawa Mari Kaneko Anna Kinoshita Nozomi Kumazawa Daichi Kobashigawa Kohei Kuroda Masashi Osawa Tatsunori Yamamoto Nobuyoshi Nakajima Hiroki Hamada Noriyoshi Masuoka Department of Life Science Okayama University of Science Okayama Japan Graduate School of Health and Welfare Science Okayama Prefectiral University Soja Japan Research Institute of Biotechnology Fujiwara Techno-Art Co. Ltd. Okayama Japan

To examine the potential ability of edible mushrooms to act as biocatalysts, 19 basidiomycete strains were screened. Modified media (PG, O, and PGO medium) for liquid cultivation of these basidiomycete strains were designed and tested. Wet cells (>10 g) of 4 basidiomycete strains (Pleurotus salmoneostramineus H7, P. salmoneostramineus H13, Ganoderma lucidum NBRC31863, Flammulina velutipes NBRC31862) were harvested from PGO medium for 7 days. The stereoselective reduction of α-keto esters using the 4 strains was tested. It was found that each of these strains had a reducing activity toward 6 aliphatic α-keto esters. In the presence of L-alanine as an additive, the reduction of ethyl 2-oxobutanoate and ethyl 2-oxopentanoete by P. salmoneostramineus H7 produced the corresponding alcohol with a high conversion ratio and with excellent enantiomeric excess (>99% e.e. (R)). Furthermore, ethyl pyruvate, ethyl 2-oxobutanoate, and ethyl 2-oxopentanoate were predominantly reduced to the corresponding (R)-hydroxy ester (>99% e.e.) by G. lucidum. Thus, we found that these edible mushrooms have great potential to be used as biocatalysts for the stereoselective reduction of carbonyl compounds.

关键词： Basidiomycete Edible Mushroom Biocatalyst Chiral Alcohol

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Induction of ischemic tolerance in rat liver via reduced nicotinamide adenine dinucleotide phosphate oxidase in Kupffer cells

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World Journal of Gastroenterology 2007年第38期13卷 5071-5078页

作者： Kazuaki Tejima Masahiro Arai Hitoshi Ikeda Tomoaki Tomiya Mikio Yanase yukiko Inoue Takako nishikawa Naoko Watanabe Natsuko Ohtomo Masao Omata Kenji Fujiwara Department of Gastroenterology University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8655 Japan Department of Gastroenterology Toshiba General Hospital 6-3-22 Higashiooi Shinagawa-ku Tokyo 140-8522 Japan Yokohama Rosai Hospital 3211 Kozukue-cho Kouhoku-ku Yokohama-shi Kanagawa 222-0036 Japan

AIM: To elucidate the mechanisms of hepatocyte preconditioning by H2O2 to better understand the pathophysiology of ischemic preconditioning. METHODS: The in vitro effect of H2O2 pretreatment was investigated in rat isolated hepatocytes subjected to anoxia/reoxygenation. Cell viability was assessed with propidium iodide fluorometry. In other experiments, rat livers were excised and subjected to warm ischemia/ reperfusion in an isolated perfused liver system to determine leakage of liver enzymes. Preconditioning was performed by H2O2 perfusion, or by stopping the perfusion for 10 min followed by 10 min of reperfusion. To inhibit Kupffer cell function or reduced nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, gadolinium chloride was injected prior to liver excision, or diphenyleneiodonium, an inhibitor of NADPH oxidase, was added to the perfusate, respectively. Histological detection of oxygen radical formation in Kupffer cells was performed by perfusion with nitro blue tetrazolium. RESULTS: Anoxia/reoxygenation decreased hepatocyte viability compared to the controls. Pretreatment with H2O2 did not improve such hepatocyte injury. In liver perfusion experiments, however, H2O2 preconditioning reduced warm ischemia/reperfusion injury, which wasreversed by inhibition of Kupffer cell function or NADPH oxidase. Histological examination revealed that H2O2 preconditioning induced oxygen radical formation in Kupffer cells. NADPH oxidase inhibition also reversed hepatoprotection by ischemic preconditioning. CONCLUSION: H2O2 preconditioning protects hepato- cytes against warm ischemia/reperfusion injury via NADPH oxidase in Kupffer cells, and not directly. NADPH oxidase also mediates hepatoprotection by ischemic preconditioning.

关键词： Diphenyieneiodonium chioride Ischemia/ reperfusion injury Ischemic preconditioning Liver transplantation Oxygen radicals

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