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Louault, K; Bonneaud, T L; Séveno, C; Gomez-Bougie, P; Nguyen, F; Gautier, F; Bourgeois, N; Loussouarn, D; Kerdraon, O; Barillé-Nion, S; Jézéquel, P; Campone, M; Amiot, M; Juin, P P; Souazé, F
Oncogene, 04/2019, Volume: 38, Issue: 17Journal Article
Selective inhibition of BCL-2 is expected to enhance therapeutic vulnerability in luminal estrogen receptor-positive breast cancers. We show here that the BCL-2 dependency of luminal tumor cells is nevertheless mitigated by breast cancer-associated fibroblasts (bCAFs) in a manner that defines MCL-1 as another critical therapeutic target. bCAFs favor MCL-1 expression and apoptotic resistance in luminal cancer cells in a IL-6 dependent manner while their own, robust, survival also relies on MCL-1. Studies based on ex vivo cultures of human luminal breast cancer tissues further argue that the contribution of stroma-derived signals to MCL-1 expression shapes BCL-2 dependency. Thus, MCL-1 inhibitors are beneficial for targeted apoptosis of breast tumor ecosystems, even in a subtype where MCL-1 dependency is not intrinsically driven by oncogenic pathways.
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