Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:1.6.5.2 (NQO1)
 6,196 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

TCF transcription factors are mediators of the WNT signaling pathway and are antagonized by the transforming growth factor beta signaling pathway. Here human TCF-3 has been cloned and characterized. Differential expression analyses of TCF genes in gastric cancer revealed that TCF-1 was expressed in most cases of primary gastric cancer at almost the same level as in normal gastric mucosa and that TCF-3 was occasionally up-regulated in primary gastric cancer. The TCF-3 expression vector was transfected to gastric cancer cell line MKN28 to establish stable transformants. Three independent MKN28 transformants overexpressing TCF-3 showed about 8-fold resistance to mitomycin C (MMC; IC50, 2.4 microg/ml) compared with MKN28 vector transfectants (IC50 = 0.3 microg/ml). Among the 10 drug resistance-associated genes examined in this study, the DT-diaphorase (DTD) gene was down-regulated in three MKN28 transformants overexpressing TCF-3. DTD mRNA was also down-regulated in primary gastric cancer with TCF-3 up-regulation. In addition, DTD protein was down-regulated in three MKN28 transformants overexpressing TCF-3 compared with MKN28 vector transfectants. DTD is implicated in the activation of MMC in target cells, and DTD down-regulation explains MMC resistance. MMC resistance induced by TCF-3 overexpression is probably due to DTD down-regulation, which might provide a possible target for new therapy of drug-resistant gastric cancer.
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PMID:Mitomycin C resistance induced by TCF-3 overexpression in gastric cancer cell line MKN28 is associated with DT-diaphorase down-regulation. 1108 12