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Molecular Biology and Genetics |
Department of Cell and Developmental Biology, Weill Medical College of Cornell University, New York, New York 10021 [L. R. H., A. M. C. B.], and Strang Cancer Research Laboratory at the Rockefeller University, New York, New York 10021 [L. R. H., O. W., J. L., A. M. C. B.]
Wnt1, initially identified as a mammary oncogene, can activate transcription via ß-catenin/TCF complexes. Twist, a transcription factor of the basic helix-loop-helix class, has also been suggested to have oncogenic properties. The aim of this study was to determine whether Twist is regulated by Wnt1 and might thus be a novel mediator of Wnt signaling. We found that Twist was up-regulated in C57MG and HC11 murine mammary epithelial cells in response to Wnt1 expression. Additionally, we detected Twist expression in normal mammary gland and found elevated Twist expression in 
70% of mammary tumors from Wnt1 transgenic mice. A murine Twist promoter fragment was shown to be responsive to ß-catenin, and its activity was enhanced by coexpression of c-jun and Ets factors of the PEA3 family. Both PEA3 factors and c-jun were highly expressed in tumors from Wnt1 transgenic mice and may therefore contribute to the increased Twist expression observed in these tumors. To evaluate functional consequences of Twist induction, we examined the effect of Twist on mammary cell differentiation. Strikingly, overexpression of either Wnt1 or Twist in HC11 mammary epithelial cells completely suppressed induction of the milk protein ß-casein in response to lactogenic hormones. Additionally, Wnt1, but not Twist, partially abrogated induction of WDNM1, another marker of lactogenic differentiation. Taken together, our data indicate that Twist expression is regulated by Wnt/ß-catenin signaling and that both Wnt1 and Twist can function as inhibitors of lactogenic differentiation, an effect that could contribute to mammary tumorigenesis.
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