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NR2F1 is a barrier to dissemination of early-evolved mammary cancer cells

Rodriguez Tirado, C. A.; Kale, N.; Carlini, M. J.; Shrivastava, N.; Khalil, B. D.; Bravo-Cordero, J. J.; Alexander, M.; Ji, J.; Sosa, M. S.

2021-01-29 cancer biology
10.1101/2021.01.29.428822 bioRxiv
Show abstract

SO_SCPLOWUMMARYC_SCPLOWCancer cells disseminate during very early and sometimes asymptomatic stages of tumor progression. Granted that biological barriers to tumorigenesis exist, there must also be limiting steps to early dissemination, all of which remain largely unknown. We report that the orphan nuclear receptor NR2F1/COUP-TF1 serves as a barrier to early dissemination. High-resolution intravital imaging revealed that loss of function of NR2F1 in HER2+ early cancer cells increased in vivo dissemination without accelerating mammary tumor formation. NR2F1 expression was positively regulated by the tumor suppressive MMK3/6-p38-MAPK pathway and downregulated by HER2 and Wnt4 oncogenic signaling. NR2F1 downregulation by HER2 in early cancer cells led to decreased E-cadherin expression and {beta}-catenin membrane localization, disorganized laminin 5 deposition, and increased expression of CK14, TWIST1, ZEB1 and PRRX1. Our findings reveal the existence of an inhibitory mechanism of dissemination regulated by NR2F1 downstream of HER2 signaling.

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