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As an important component of the tumor microenvironment, CD4 + CD25 +  Tregs reduce antitumor immunity, promote angiogenesis and metastasis in breast cancer. However, their function in regulating the “stemness” of tumor cells and the communication between Tregs and cancer stem cells (CSCs) remain elusive. Here, we disclose that the primarily cultured Tregs isolated from breast‐tumor‐bearing  Foxp3‐EGFP  mouse upregulate the stemness property of breast cancer cells. Tregs increased the side‐population and the Aldehyde dehydrogenase‐bright population of mouse breast cancer cells, promoted their sphere formation in a paracrine manner, and enhanced the expression of stemness genes, such as  Sox2  and so forth. In addition, Tregs increased tumorigenesis, metastasis, and chemoresistance of breast cancer cells. Furthermore, Sox2‐overexpression tumor cells activated NF‐κB‐CCL1 signaling to recruit Tregs through reducing the binding of H3K27Me3 on promoter regions of  p65  and  Ccl1 . These findings reveal the functional interaction between Tregs and CSCs and indicate that targeting on the communication between them is a promising strategy in breast cancer therapy. S tem  C ells   2017;35:2351–2365

Sox2 Communicates with Tregs Through CCL1 to Promote the Stemness Property of Breast Cancer Cells