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Dive into the research topics where Tomohisa Kato is active.

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Featured researches published by Tomohisa Kato.


Biochemical and Biophysical Research Communications | 2010

Development of tetraphenylethylene-based fluorescent oligosaccharide probes for detection of influenza virus.

Tomohisa Kato; Atsushi Kawaguchi; Kyosuke Nagata; Kenichi Hatanaka

Abstract Tetraphenylethylene (TPE) derivatives have strong fluorescence in aggregated state. We designed and synthesized a tetraphenylethylene derivative bearing alkyne groups which were used for combination by click chemistry. The new TPE compound bearing alkyne groups was used to synthesize fluorescence oligosaccharide probes which have lactosyl and 6′-sialyllactosyl moieties as ligands. We found that the TPE compounds bearing lactosyl and 6′-sialyllactosyl moieties were useful for detection of RCA120 and SSA lectins, respectively. Moreover, we have shown that TPE-based fluorescent oligosaccharide probe bearing 6′-sialyllactose moiety can be utilized as a “turn-on” fluorescent sensor for detection of influenza virus.


Analytical Biochemistry | 2010

Novel method for chase analysis of oligosaccharide metabolic error caused by xenobiotics.

Tomohisa Kato; Miho Muraoka; Kenichi Hatanaka

Saccharide primers, such as dodecyl beta-lactoside (Lac-C12), are unique artificial precursors of glycolipid synthesis. In culture media supplemented with saccharide primers, they are taken up by the cells in the culture media and glycosylated by cellular glycosyltransferases in the Golgi apparatus to form pseudo-glycolipids. In this study, we examine the effects of various xenobiotics on glycolipid synthesis by implementing a novel method to analyze pseudo-glycolipids, mainly gangliosides, produced by ONS-76 medulloblastoma cells in a culture medium containing various xenobiotics. The ganglioside group of pseudo-glycolipids was effectively purified by using strong anion-exchange cartridges. The production of pseudo-gangliosides was stimulated by N-(n-butyl)deoxygalactonojirimycin (NB-DGJ), but was inhibited by castanospermine, 2-deoxy-2-fluoro-d-galactose, tunicamycin, and brefeldin A. Because the cells in the culture medium are exposed to the saccharide primers and xenobiotics at the same time, and are secreted in the culture medium in their glycosylated form, our method can be used to effectively analyze the direct effects of xenobiotics on ganglioside synthesis.


Journal of Chromatography A | 2008

Purification by centrifugal partition chromatography of amphiphilic compounds, glycolipids and pseudo-glycolipids synthesized by using cells.

Tomohisa Kato; Atsushi Miyagawa; Maria Carmelita Z. Kasuya; Ayaka Ito; Kenichi Hatanaka


Journal of Lipid Research | 2008

Purification of gangliosides by liquid-liquid partition chromatography

Tomohisa Kato; Kenichi Hatanaka


Archive | 2010

Method, kit and device for detecting nucleic acid

Shigehiko Miyamoto; Tomohisa Kato; Koji Takahashi; Jun Tomono


Journal of Oleo Science | 2008

Rapid Separation of Gangliosides Using Strong Anion Exchanger Cartridges

Tomohisa Kato; Maria Carmelita Z. Kasuya; Kenichi Hatanaka


Journal of Bioscience and Bioengineering | 2011

Flow cytometric analysis of lectin–oligosaccharide interactions by using fluorescent oligosaccharide probes

Tomohisa Kato; Kenichi Hatanaka


Archive | 2010

METHOD FOR DETECTING NUCLEIC ACID, AND DEVICE OR KIT

Shigehiko Miyamoto; Tomohisa Kato; Koji Takahashi; Jun Tomono


American Journal of Biochemistry and Biotechnology | 2008

An Efficient Production of Oligosaccharides by a Reaction using Whole Mammalian Cells as Biocatalysts

Tomohisa Kato; Rie Mitsumori; Kenichi Hatanaka


Archive | 2015

SCREENING PROCESS FOR PLURIPOTENT STEM CELL PROPAGATION PROMOTING FACTOR

Tomohisa Kato; Yonehiro Kanemura; Tomoko Shofuda; Hayato Fukusumi

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