NO cytoplasmic domain coactivates Wnt target gene transcription and confers transformation

作者：Huang L; Ren R; Hen DS; Li YQ; Kharbanda S; Kufe D^*

来源：Cancer Biology and Therapy, 2003, 2(6): 702-706.

• MUC1
• beta-catenin
• Tcf4
• cyclin D1
• transcription
• transformation

The DF3/MUC1 mucin-like transmembrane oncoprotein is overexpressed by most human carcinomas. The MUC1 cytoplasmic domain (CD) binds directly to the Writ effector, beta-catenin, and colocalizes with beta-catenin in the nucleus; however, the nuclear function of MUC1 is unknown. The present results demonstrate that MUC1 coactivates transcription of beta-catenin-Tcf-binding sites in the pTOPFLASH reporter. Activation of transcription was abrogated by expression of MUC1 with a Y-46 --> F mutation in the CD that attenuates binding of MUC1 and p-catenin. We also show that transcription of the Wnt responsive cyclin D1 promoter is activated by MUC1, but not MUC1 (Y46F), and that the cyclin D1 gene is upregulated in MUC1-positive cells. In concert with these results, MUC1-induced anchorage-independent growth and tumorigenicity were also abrogated by mutating MUC1 at the Y-46 site. These findings support a model in which the MUC 1 functions as a transforming protein by coactivating transcription of Writ target genes.

• 出版日期2003-12