Abstract
Gut-enriched Krüppel-like factor (GKLF or KLF4) is a zinc finger-containing, epithelial-specific transcription factor, that functions as a suppressor of cell proliferation. We previously showed that GKLF expression is decreased in intestinal and colonic adenomas, respectively, from multiple intestinal neoplasia (Min) mice and familial adenomatous polyposis (FAP) patients. This study shows that GKLF is induced upon activation of the adenomatous polyposis coli (APC) gene. However, among several human colon cancer cell lines surveyed, expression of GKLF is lowest in RKO, a line with wild-type APC and β-catenin. RKO contains a mutated allele that encodes the putative tumor suppressor homeodomain protein, CDX2. We show that wild-type CDX2 activates the GKLF promoter and that the mutated CDX2 has a dominant negative effect on wild-type function. Our results may help explain the exceedingly low levels of GKLF expression detected in this cell line, which may in turn contribute to the tumor phenotype.
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Acknowledgements
We are indebted to Dr Bert Vogelstein for generously providing HT29–APC and HT29–β-Gal cell lines; the SI–PGL3–luciferase; TCF3 WT and mutant-pGL3–luciferase reporters; and the mutant β-catenin (S33Y), wild-type and mutant CDX2 expression vectors; Drs Kurtis Bachman and Paul Corn for providing colorectal cancer cell lines; Dr Kallayanee Chawengsaksophak for the CDX2 genomic clone; and Dr Anil Rustgi for the human GKLF cDNA plasmid. This work was partially funded by NIH Grants CA84197, DK52230 and DK10020. DT Dang is a recipient of the Stanley J. Sarnoff Endowment for the Cardiovascular Sciences Scholar Award. IA Agboola was supported by the Minority Summer Internship Program of the Johns Hopkins University.
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Dang, D., Mahatan, C., Dang, L. et al. Expression of the gut-enriched Krüppel-like factor (Krüppel-like factor 4) gene in the human colon cancer cell line RKO is dependent on CDX2. Oncogene 20, 4884–4890 (2001). https://doi.org/10.1038/sj.onc.1204645
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DOI: https://doi.org/10.1038/sj.onc.1204645
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