期刊
JOURNAL OF CLINICAL INVESTIGATION
卷 123, 期 3, 页码 1348-1358出版社
AMER SOC CLINICAL INVESTIGATION INC
DOI: 10.1172/JCI65416
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资金
- ACS Clinical Research Professorship Grant [CRP-07-234]
- The Lee Jeans Translational Breast Cancer Research Program
- Breast Cancer Specialized Program of Research Excellence (SPORE) [P50 CA98131]
- Vanderbilt-Ingram Cancer Center Support Grant [P30 CA68485]
- Stand Up to Cancer Dream Team Translational Research Grant
- Program of the Entertainment Industry Foundation [SU2C-AACR-DT0209]
- Susan G. Komen for the Cure Foundation Grant [SAC100013]
- NIH [R01 CA143126]
- Susan G. Komen for the Cure Foundation Career Catalyst Grant [KG 100677]
After an initial response to chemotherapy, many patients with triple-negative breast cancer (TNBC) have recurrence of drug-resistant metastatic disease. Studies with TNBC cells suggest that chemotherapy-resistant populations of cancer stem-like cells (CSCs) with self-renewing and tumor-initiating capacities are responsible for these relapses. TGF-beta has been shown to increase stem-like properties in human breast cancer cells. We analyzed RNA expression in matched pairs of primary breast cancer biopsies before and after chemotherapy. Biopsies after chemotherapy displayed increased RNA transcripts of genes associated with CSCs and TGF-beta signaling. In TNBC cell lines and mouse xenografts, the chemotherapeutic drug paclitaxel increased autocrine TGF-beta signaling and IL-8 expression and enriched for CSCs, as indicated by mammosphere formation and CSC markers. The TGF-beta type I receptor kinase inhibitor LY2157299, a neutralizing TGF-beta type II receptor antibody, and SMAD4 siRNA all blocked paclitaxel-induced IL8 transcription and CSC expansion. Moreover, treatment of TNBC xenografts with LY2157299 prevented reestablishment of tumors after paclitaxel treatment. These data suggest that chemotherapy-induced TGF-beta signaling enhances tumor recurrence through IL-8-dependent expansion of CSCs and that TGF-beta pathway inhibitors prevent the development of drug-resistant CSCs. These findings support testing a combination of TGF-beta inhibitors and anticancer chemotherapy in patients with TNBC.
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