title: Evaluation of laser microdissection as a tool in cancer glycomic studies.
abstract: Laser microdissection (LMD) is a recent development that enables the isolation of specific cell populations from tissue sections. This study focuses on the potential of LMD as a tool in cancer glycomics using colon cancer as a model. LMD was performed on hematoxylin and eosin stained frozen tissue sections. Tumor cells and normal epithelial cells were selectively microdissected. N-Glycans from the LMD- and the bulk tissue-derived samples were liberated by hydrazinolysis and then labeled with 2-aminopyridine. After sialidase digestion, the resulting asialo-N-glycans were analyzed by normal and reversed phase HPLC combined with mass spectrometry. Comparison of the various N-glycan profiles with the aid of LMD identified seven characteristic N-glycans with significantly different expression profiles between normal and cancerous cells that could not be detected by conventional analysis. Thus, LMD is a potent and useful tool for analyzing variations in the expression of N-glycans by overcoming the problem of tissue sample heterogeneity.
authors.affiliation: Department of Immunology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-2 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Korekane
authors.forename: Kyoko
authors.initials: K
authors.lastname: Shida
authors.forename: Kohei
authors.initials: K
authors.lastname: Murata
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ohue
authors.forename: Yo
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Shingi
authors.initials: S
authors.lastname: Imaoka
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Miyamoto
mesh_terms: D002240:Carbohydrate Sequence; D002469:Cell Separation / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003110:Colonic Neoplasms / Q000378:metabolism* / Q000473:pathology*; D006801:Humans; D007834:Lasers; D013058:Mass Spectrometry / Q000379:methods; D042282:Microdissection / Q000379:methods*; D008969:Molecular Sequence Data; D011134:Polysaccharides / Q000032:analysis* / Q000737:chemistry*
chemical_list: D011134:Polysaccharides