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Articles by S Noura
Total Records ( 2 ) for S Noura
  K Shida , Y Misonou , H Korekane , Y Seki , S Noura , M Ohue , K Honke and Y. Miyamoto
 

The structures of glycosphingolipids from highly purified colorectal cancer cells and normal colorectal epithelial cells of 16 patients have been analyzed in fine detail (Misonou Y, Shida K, Korekane H, Seki Y, Noura S, Ohue M, Miyamoto Y. 2009. Comprehensive Clinico-Glycomic Study of 16 Colorectal Cancer Specimens: Elucidation of aberrant glycosylation and ts mechanistic causes in colorectal cancer cells. J Proteome Res. 8:2990–3005). Further structural analyses demonstrated that colon cancer cells from two patients accumulated unusual glycosphingolipids which were not observed in either colorectal cancer cells or normal colorectal epithelial cells from the other patients. Mass spectrometry analyses revealed that the unusual structures include sulfated oligosaccharides. The structures of the glycosphingolipids of the cancer cells from these two cases were analyzed by methods which include enzymatic release of carbohydrate moieties, fluorescent labeling with aminopyridine and identification using two-dimensional mapping, enzymatic digestion and mass spectrometry together with methanolysis, and the use of newly synthesized sulfo-fucosylated oligosaccharides as standards. The colon cancer cells from one of the patients demonstrate a variety of oligosaccharides as major components which are sulfated at the C6 position of subterminal GlcNAc and at C3 positions of terminal galactose with or without sialylation or fucosylation. These include 6-sulfo Lex, 6'-sialyl 6-sulfo lactosamine, and 3'-sialyl 6-sulfo Lex, in addition to sialylated or fucosylated derivatives of type-1 and type-2 hybrid oligosaccharides. The colon cancer cells from the other patient have two kinds of sulfated oligosaccharides, a 6-sulfo Lex structure and a 3'-sulfo Lex structure, as minor components. Taking into consideration the clinical features of the two patients, the biological significance of sulfated glycosphingolipids on cancer cells is discussed.

  K Shida , H Korekane , Y Misonou , S Noura , M Ohue , H Takahashi , H Ohigashi , O Ishikawa and Y. Miyamoto
 

We have precisely analyzed the structures of glycosphingolipids of human cancer cells and normal epithelial cells using several methods, including enzymatic release of carbohydrate moieties, fluorescent labeling, and identification using 2D mapping, enzymatic digestion, and mass spectrometry. These analyses enabled the identification of novel tumor-associated carbohydrate antigens that can be used to elucidate the involvement of carbohydrates in cancer malignancy and could act as candidate tumor markers. In our previous study, we identified a novel glycosphingolipid that accumulates in colon cancer cells, NeuAc2-6(Fuc1-2)Galβ1-4GlcNAcβ1-3Galβ1-4Glc (2-6 sialylated type 2H, ST2H). Here, structural analyses of cancer cells and normal epithelial cells from 60 colorectal and five pancreatic cancer patients, including four and two Lewis-negative individuals, respectively, reveal the presence of an additional novel glycosphingolipid, NeuAc2-6(Fuc1-2)Galβ1-3GlcNAcβ1-3Galβ1-4Glc (2-6 sialylated type 1H, ST1H). ST2H was found in colorectal and pancreatic cancer cells from about half of the cases. Unlike ST2H, ST1H was found in cancer cells from three out of six Lewis-negative patients (i.e., two cases of colorectal and one case of pancreatic cancer). However, the moiety was not found in normal epithelial cells or cancer cells from 59 Lewis-positive patients. These findings suggest that the accumulation of this carbohydrate antigen occurs predominantly in cancer cells of Lewis-negative patients. When the ST1H epitope is also carried on mucins as well as glycosphingolipids, this epitope is a promising tumor marker candidate, especially for Lewis-negative individuals.

 
 
 
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