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Articles by Y Inoue
Total Records ( 2 ) for Y Inoue
  T Hamaguchi , T Ito , Y Inoue , T Limpaseni , P Pongsawasdi and K. Ito

Endo-β-N-acetylglucosaminidases are thought to be key enzymes in the catabolism of asparagine-linked oligosaccharides. However, little is known about the enzymes of this type in basidiomycetes. We investigated endo-β-N-acetylglucosaminidases in basidiomycetes using fluorescence-labeled glycoasparagines as substrates. Flammulina velutipes showed high activity and its enzyme was named endo-β-N-acetylglucosaminidase FV (Endo FV). The enzyme purified from the fruiting bodies of F. velutipes was separated into two forms. Endo FV was specific for high mannose and hybrid-type oligosaccharides. The enzyme was remarkably less active against asparagine-linked oligosaccharides attached to glycoproteins. It transferred an asparagine-linked oligosaccharide to Glc, but not to Gal. cDNA of Endo FV was cloned. It was composed of a 996-bp open reading frame encoding 331 amino acid residues. A recombinant Endo FV expressed in Escherichia coli showed enzymatic activity. The Endo FV gene in the genome of F. velutipes had no introns. The gene encoding Endo FV showed little homology with genes of known endo-β-N-acetylglucosaminidases. A chitinase active site motif existed in the deduced primary structure, indicating that Endo FV belongs to glycoside hydrolase family 18. The deduced amino acid sequence of Endo FV had regions conserved in class III chitinases from fungi though it showed little homology with the sequence of any other endo-β-N-acetylglucosaminidases. A folding model of Endo FV indicated it to be homologous with the tertiary structure of Endo H which is quite similar in specificity for asparagine-linked oligosaccharides. This study suggests that Endo FV may become similar to Endo H in substrate specificity as a result of evolutionary convergence.

  Y Inoue , Y Toiyama , K Tanaka , C Miki and M. Kusunoki

Analyses were performed to assess whether the use of chemotherapeutic agents or regimens against colorectal cancer (CRC) differed among countries, especially the United States (USA), the European Union (EU) and Japan.


The data source for this study was the IMS Health, Oncology AnalyzerTM. We utilized data on the use of anticancer drugs and follow-up information for patients with CRC from April 2006 to March 2007, collected from the USA, the EU (G5: France, Germany, Italy, Spain and the UK) and Japan. A total of 102 502 patients were enrolled.


Wide differences were found in the actual regimens adopted by each region and nation. In other words, the concept of oncologist-related variability in chemotherapy for CRC was clearly seen. Factors such as a nation's historical characteristics and the healthcare policies of respective governments, including drug approval and cost-effectiveness, also appeared to have roles. However, comparisons of 5-year relative survival rates from population-based cancer registries in the USA, the EU and Japan showed that survival rates for CRC in the three regions did not differ widely, despite differences in the actual use of medical therapy. This may suggest that regional usage trends for anticancer regimens were optimal, although the application of chemotherapy was not the intentional standardization.


Global information exchanges regarding oncologist-related factors along with global evidence could result in patient survival being prolonged by the establishment of intentional standardized treatments suited for regional characteristics.

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