Colonic carcinogenesis along different genetic routes

• Verfasst von: Gebert, Johannes [VerfasserIn]
• Verfasst von: Kloor, Matthias [VerfasserIn]
• Verfasst von: Lee, Jennifer [VerfasserIn]
• Verfasst von: Kopitz, Jürgen [VerfasserIn]
• Titel: Colonic carcinogenesis along different genetic routes
• Titelzusatz: glycophenotyping of tumor cases separated by microsatellite instability/stability
• Verf.angabe: Johannes Gebert, Matthias Kloor, Jennifer Lee, Michaela Lohr, Sabine André, Rudolf Wagner, Juergen Kopitz, Hans-Joachim Gabius
• E-Jahr: 2012
• Jahr: 08 May 2012
• Umfang: 12 S.
• Fussnoten: Gesehen am 25.04.2018
• Titel Quelle: Enthalten in: Histochemistry and cell biology
• Ort Quelle: Berlin : Springer, 1958
• Jahr Quelle: 2012
• Band/Heft Quelle: 138(2012), 2, Seite 339-350
• ISSN Quelle: 1432-119X
• DOI: doi:10.1007/s00418-012-0957-9
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1572351012

Abstract

Different genetic routes account for colonic carcinogenesis. However, when analyzing colon cancer specimens, separation into different groups based on genetic alterations is commonly not performed. Thus, we here initiate the comparative phenotyping considering microsatellite instability/stability for clinical specimens. The focus is given to glycan epitopes, expression of which is known to be modulated by signal-transducing proteins that act as key regulators of normal colon epithelial growth and differentiation. In addition to six plant lectins used as sensors, the presence of two adhesion/growth-regulatory galectins is studied. Overall, a considerable level of intra- and interindividual heterogeneity is revealed. Alterations in the proportion of stained cells between tumor-adjacent and malignant epithelia concerned plant lectins, which bind substituted N-glycan cores, α2,6-sialylated branch ends, core 1 O-glycans and N-acetylgalactosamine. A tendency for changes was noted between microsatellite-unstable and microsatellite-stable cases for core substitution (bisected N-glycan, presence of β1,6-branching) and status of α2,6-sialylation. Statistical significance was reached for presence of galectin-3, found to be elevated in microsatellite-stable compared to microsatellite-unstable tumors. These results emphasize the potential of distinct signaling pathways to regulate certain aspects of the glycophenotype in vivo and thus delineate a perspective to discern functionally relevant deviations in expression of endogenous lectins and their counter-receptors.