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RANK links senescence to stemness in the mammary epithelia, delaying tumor onset but increasing tumor aggressiveness.

Sandra Benítez | Alex Cordero | Patricia G Santamaría | Jaime Redondo-Pedraza | Ana S Rocha | Alejandro Collado-Solé | Maria Jimenez | Adrian Sanz-Moreno | Guillermo Yoldi | Juliana C Santos | Ilaria De Benedictis | Clara Gómez-Aleza | Sabela Da Silva-Álvarez | Kevin Troulé | Gonzalo Gómez-López | Noelia Alcazar | Ignacio Palmero | Manuel Collado | Manuel Serrano | Eva Gonzalez-Suarez
Developmental cell | 2021

Rank signaling enhances stemness in mouse and human mammary epithelial cells (MECs) and mediates mammary tumor initiation. Mammary tumors initiated by oncogenes or carcinogen exposure display high levels of Rank and Rank pathway inhibitors have emerged as a new strategy for breast cancer prevention and treatment. Here, we show that ectopic Rank expression in the mammary epithelia unexpectedly delays tumor onset and reduces tumor incidence in the oncogene-driven Neu and PyMT models. Mechanistically, we have found that ectopic expression of Rank or exposure to Rankl induces senescence, even in the absence of other oncogenic mutations. Rank leads to DNA damage and senescence through p16/p19. Moreover, RANK-induced senescence is essential for Rank-driven stemness, and although initially translates into delayed tumor growth, eventually promotes tumor progression and metastasis. We uncover a dual role for Rank in the mammary epithelia: Rank induces senescence and stemness, delaying tumor initiation but increasing tumor aggressiveness.

Pubmed ID: 34004159 RIS Download

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