Abstract
The cytokine interleukin-6 (IL6) and its downstream effector STAT3 constitute a key oncogenic pathway, which has been thought to be functionally connected to estrogen receptor α (ER) in breast cancer. We demonstrate that IL6/STAT3 signaling drives metastasis in ER+ breast cancer independent of ER. STAT3 hijacks a subset of ER enhancers to drive a distinct transcriptional program. Although these enhancers are shared by both STAT3 and ER, IL6/STAT3 activity is refractory to standard ER-targeted therapies. Instead, inhibition of STAT3 activity using the JAK inhibitor ruxolitinib decreases breast cancer invasion in vivo. Therefore, IL6/STAT3 and ER oncogenic pathways are functionally decoupled, highlighting the potential of IL6/STAT3-targeted therapies in ER+ breast cancer.
Originalsprog | Engelsk |
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Tidsskrift | Cancer Cell |
Vol/bind | 38 |
Udgave nummer | 3 |
Sider (fra-til) | 412-423.e9 |
ISSN | 1535-6108 |
DOI | |
Status | Udgivet - 14. sep. 2020 |
Udgivet eksternt | Ja |