Cell surface N-glycosylation and sialylation regulate galectin-3-induced apoptosis in human diffuse large B cell lymphoma.
Galectin-3 is a soluble endogenous lectin in vertebrates and is implicated in a variety of biological functions, including tumor cell adhesion, proliferation, differentiation, apoptosis, cancer progression and metastasis. In the present study, we analyzed the role of galectin-3 in apoptosis in human malignant lymphoma. Galectin-3 induced cell death in the HBL-2 human diffuse large B cell lymphoma cell line. A morphological examination and annexin V assays revealed that galectin-3-induced cell death is consistent with apoptosis and swainsonine, a potent inhibitor of alpha-mannosidase II, which catalyzes the synthesis of complex type N-linked oligosaccharides, inhibited galectin-3-induced apoptosis in HBL-2 cells. These results suggest that galectin-3 induces apoptosis in HBL-2 cells by interacting with cell surface N-linked oligosaccharides. Furthermore, treatment of cells with Vibrio Cholerae neuraminidase enhanced galectin-3-induced apoptosis, suggesting that cell surface sialylation regulates galectin-3-induced apoptosis in human B cell lymphoma. In conclusion, our results indicate that galectin-3-induced apoptosis is regulated by cell surface expression of N-glycans and sialic acid in human diffuse large B cell lymphoma. This mechanism may be involved in the malignant behavior of human lymphoma cells.
Suzuki
Osamu
O
First Department of Pathology, School of Medicine, Fukushima Medical University, Fukushima 960-1295, Japan. osuzuki@fmu.ac.jp
Abe
Masafumi
M
D017304:Annexin A5 / Q000032:analysis; D017209:Apoptosis; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000378:metabolism; D037502:Galectin 3 / Q000494:pharmacology*; D006031:Glycosylation; D006801:Humans; D016403:Lymphoma, Large B-Cell, Diffuse / Q000378:metabolism* / Q000473:pathology; D011134:Polysaccharides / Q000378:metabolism*; D012794:Sialic Acids / Q000378:metabolism*
D017304:Annexin A5; D037502:Galectin 3; D011134:Polysaccharides; D012794:Sialic Acids