Abstract:
:Many tumors arising from epithelial tissues produce mucins, which readily come into contact with infiltrating cells in cancer tissues. MUC2 mucins were purified from the conditioned medium of a colorectal cancer cell line, LS180 cells. It is known that in cancer patients, the number of dendritic cells (DCs) is reduced and their function is impaired. Mature DCs were generated from human peripheral blood monocytes through successive treatments with GM-CSF and IL-4, and then with proinflammatory mediators. When monocytes were cultured in the presence of MUC2 mucins in addition to GM-CSF and IL-4 at an early stage of development, mature DCs expressing CD83 decreased and apoptotic cells increased in a dose-dependent manner. During the development of DCs, sialic acid-binding Ig-like lectin (Siglec)-3 was constantly expressed. We prepared recombinant soluble Siglec-3 corresponding to the ectodomain of Siglec-3 and confirmed the binding of soluble Siglec-3 to the MUC2 mucins, probably through alpha2,6-sialic acid-containing O-glycans including a sialyl Tn antigen, which is known to bind to Siglec-3. Apoptosis was partially inhibited by anti-Siglec-3 mAb or recombinant soluble Siglec-3. These results suggest that apoptosis was partially induced through the ligation of the MUC2 mucins with Siglec-3.
journal_name
Proteomicsjournal_title
Proteomicsauthors
Ishida A,Ohta M,Toda M,Murata T,Usui T,Akita K,Inoue M,Nakada Hdoi
10.1002/pmic.200800039subject
Has Abstractpub_date
2008-08-01 00:00:00pages
3342-9issue
16eissn
1615-9853issn
1615-9861journal_volume
8pub_type
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