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- W2033492024 abstract "A current challenge is to define the biological characteristics of colon tumor cells resistant to chemotherapy. Distinct sub-populations of mucus-secreting cells were previously obtained from the colon cancer cell line HT-29 after long-term treatment with the anti-cancer drugs, 5-fluorouracil (5-FU) and methotrexate (MTX). Since mucins are increasingly implicated as playing a role in carcinogenesis, we studied the pattern of mucin expression in two HT-29 clones of mucus-secreting and two clones of enterocyte-like phenotype which differ in their capacity to resist to 5-FU and/or MTX. The expression of both transmembrane (MUC1, MUC3, MUC4) and secreted gel-forming (MUC2, MUC5AC, MUC5B, MUC6) mucins in clones was studied by northern and/or western blotting. The four HT-29 clones showed three cellular phenotypes: (1) The mucus-secreting clone HT29-5F12 consists of unpolarized cells with mucus secretions that have anti-colonic mucin immunoreactivity, and mainly expresses MUC2 and is resistant to 5-FU and sensitive to MTX; (2) The mucus-secreting clone HT29-5M21 forms a monolayer of polarized cells with strong anti-gastric mucin immunoreactivity and mainly expresses MUC5AC and MUC5B and is resistant to MTX and sensitive to 5-FU; (3) The two enterocyte-like clones, HT29-5F7 and HT29-5M12 are resistant to both MTX and 5-FU and express mainly MUC1 and MUC5B, respectively. These clones which originate from a same colorectal tumour and display different patterns of mucin expression as well as differing resistance to MTX and 5-FU will make useful in vitro models for studying the potential role of mucins or other biological markers in drug resistance pathways." @default.
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- W2033492024 date "2004-03-01" @default.
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- W2033492024 title "Differential mucin expression in colon carcinoma HT-29 clones with variable resistance to 5-fluorouracil and methotrexate" @default.
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- W2033492024 doi "https://doi.org/10.1016/j.biolcel.2003.12.005" @default.
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