Lectin isolation and detection of N-glycoproteins bearing sialic acid and L-fucose residues in human colorectal mucosa and in adenocarcinoma biopsies
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- Published online on: February 1, 2002 https://doi.org/10.3892/ijo.20.2.367
- Pages: 367-372
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Abstract
A method to improve the reactivity to specific lectins of N-glycoproteins isolated from human colorectal mucosa and from adenocarcinoma biopsies was developed using a combination of techniques. Total protein extracts were subjected to affinity chromatography, using the immobilised lectin Concanavalin A coupled to Sepharose, by fast performance liquid chromatography (FPLC). N-glycoprotein enriched fractions were resolved by SDS-PAGE, transferred to PVDF membranes and incubated with various lectins. Digoxigenin-conjugated SNA I and MAA lectins were used to detect sialic acid residues. Biotin-conjugated UEA I lectin was used to detect L-fucose residues. By this method, lectin-binding N-glycoproteins were found in a broad relative molecular mass (Mr) range (from 47 to 205 kDa). No tissue-specific N-glycoproteins were observed when human colorectal mucosa and adenocarcinoma samples were compared.
