Activation of Peroxisome Proliferator-Activated Receptor-β/δ (PPAR-β/δ) Inhibits Human Breast Cancer Cell Line Tumorigenicity

Molecular Cancer Therapeutics - Tập 13 Số 4 - Trang 1008-1017 - 2014
Pei‐Li Yao1,2, José L. Quiles1,2, Bokai Zhu1,2, Boo-Hyon Kang1,2, Frank J. Gonzalez1,2, Jeffrey M. Peters1,2
1Authors' Affiliations: 1Department of Veterinary and Biomedical Sciences and The Center of Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, Pennsylvania; and 2Non-clinical Research Institute, Chemon, Jeil-Ri, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do, Korea; and 3Laboratory of Metabolism, National Cancer Institute, Bethesda, Maryland
2Laboratory of Metabolism, National Cancer Institute, Bethesda, Maryland

Tóm tắt

Abstract The effect of activation and overexpression of the nuclear receptor PPAR-β/δ in human MDA-MB-231 (estrogen receptor–negative; ER−) and MCF7 (estrogen-receptor-positive; ER+) breast cancer cell lines was examined. Target gene induction by ligand activation of PPAR-β/δ was increased by overexpression of PPAR-β/δ compared with controls. Overexpression of PPAR-β/δ caused a decrease in cell proliferation in MCF7 and MDA-MB-231 cells compared with controls, whereas ligand activation of PPAR-β/δ further inhibited proliferation of MCF7 but not MDA-MB-231 cells. Overexpression and/or ligand activation of PPAR-β/δ in MDA-MB-231 or MCF7 cells had no effect on experimental apoptosis. Decreased clonogenicity was observed in both MDA-MB-231 and MCF7 overexpressing PPAR-β/δ in response to ligand activation of PPAR-β/δ as compared with controls. Ectopic xenografts developed from MDA-MB-231 and MCF7 cells overexpressing PPAR-β/δ were significantly smaller, and ligand activation of PPAR-β/δ caused an even greater reduction in tumor volume as compared with controls. Interestingly, the decrease in MDA-MB-231 tumor size after overexpressing PPAR-β/δ and ligand activation of PPAR-β/δ correlated with increased necrosis. These data show that ligand activation and/or overexpression of PPAR-β/δ in two human breast cancer cell lines inhibits relative breast cancer tumorigenicity and provide further support for the development of ligands for PPAR-β/δ to specifically inhibit breast carcinogenesis. These new cell-based models will be invaluable tools for delineating the role of PPAR-β/δ in breast cancer and evaluating the effects of PPAR-β/δ agonists. Mol Cancer Ther; 13(4); 1008–17. ©2014 AACR.

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