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Glucosamine, a naturally occurring amino monosaccharide modulates LL-37-induced endothelial cell activation

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Atheroscleros is now considered as a chronic inflammatory disease, and glucosamine has a potential to exhibit anti-inflammatory action. Thus, we investigated the effect of glucosamine on LL-37-induced endothelial cell activation. HUVEC (human umbilical vein endothelial cells) were stimulated by LL-37 in the presence or absence of glucosamine (0.01-1 mM) or its analogue, N-acetylglucosamine (0.1-1 mM). mRNA expression of MCP-1 (monocyte chemoattractant protein-1) and ICAM-1 (intercellular adhesion molecule-1) was evaluated by real-time RT-PCR, and their protein levels were analyzed by ELISA and Western blotting, respectively. Furthermore, the effect of glucosamine on O-N-acetylglucosamine (O-GlcNAc) modification was evaluated by Western blotting. Glucosamine but not N-acetylglucosamine suppressed the LL-37-induced expression of MCP-1 and ICAM-1 at both mRNA (p<0.05 at 0.1 mM) and protein levels (p<0.05 at 1 mM). Of interest, O-GlcNAc modification was induced by incubating HUVEC with glucosamine (p<0.05 at 1 mM) but not N-acetylglucosamine. Of note, alloxan, an O-N-acetylglucosamine transferase inhibitor, which prevented the glucosamine-induced O-GlcNAc modification, abrogated the suppressive effect of glucosamine on MCP-1 and ICAM-1 expression (p<0.05 at 0.5 mM). These observations suggest that glucosamine modulates endothelial cell activation possibly via O-GlcNAc modification, and may exhibit an anti-inflammatory action on atherosclerosis.
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Document Type: Research Article

Affiliations: Department of Host Defense and Biochemical Research, Juntendo University, School of Medicine, Hongo, Tokyo 113-8421, Japan

Publication date: November 1, 2008

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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