Appearance of high-molecular weight sialoglycoproteins recognized by Maackia amurensis leukoagglutinin in gastric cancer tissues: a case report using 2-DE-lectin binding analysis

  • Biosci Trends. 2008 Aug;2(4):151-4.
Yoshinori Inagaki  1 ,  Mayumi Usuda ,  Huanli Xu ,  Fengshan Wang ,  Shuxiang Cui ,  Ken-ichi Mafune ,  Yasuhiko Sugawara ,  Norihiro Kokudo ,  Wei Tang ,  Munehiro Nakata
Affiliations
  • 1. Department of Applied Biochemistry, Tokai University, Hiratsuka, Kanagawa, Japan.
PMID: 20103921
Abstract

Aberrant expression of sialoglycoconjugates has been thought to play an important role in Cancer progression. Our previous lectin-histochemical study showed that overexpression of sialoglycoconjugates recognized by alpha2,3-sialic acid-specific Maackia amurensis leukoagglutinin (MAL) was significantly related to the malignancy of gastric Cancer. The present study analyzed the sialoglycoproteins in gastric Cancer tissues by 2-dimensional electrophoresis (2-DE) in combination with lectin-binding analysis using MAL. Various MAL-positive sialoglycoproteins were detected in Cancer tissues but not in non-cancer tissues. The sialoglycoproteins have a high molecular weight of near 200 kDa and over 200 kDa with different pI values for the two. This suggests that the MAL-positive sialoglycoproteins detected in gastric Cancer tissues have high molecular weights and may contain different numbers of alpha2,3-linked sialic acid residues in the carbohydrate moiety.

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