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00925njm 22002777a 4500 dc Martínez-Iglesias, Olaia author Garcia-Silva, Susana author Tenbaum, Stephan P author Regadera, Javier author Larcher, Fernando author Paramio, Jesus M author Vennström, Bjorn author Aranda, Ana author 2009-01-15 Loss of thyroid hormone receptors (TR) is a common feature in some tumors, although their role in tumor progression is currently unknown. We show here that expression of TRbeta1 in hepatocarcinoma and breast cancer cells reduces tumor growth, causes partial mesenchymal-to-epithelial cell transition, and has a striking inhibitory effect on invasiveness, extravasation, and metastasis formation in mice. In cultured cells, TRbeta1 abolishes anchorage-independent growth and migration, blocks responses to epidermal growth factor, insulin-like growth factor-I, and transforming growth factor beta, and regulates expression of genes that play a key role in tumorigenicity and metastatic growth. The receptor disrupts the mitogenic action of growth factors by suppressing activation of extracellular signal-regulated kinase and phosphatidylinositol 3-kinase signaling pathways that are crucial for cell proliferation and invasiveness. Furthermore, increased aggressiveness of skin tumors is found in genetically modified mice lacking TRs, further demonstrating the role of these receptors as inhibitors of tumor progression. These results define a novel role for the thyroid hormone receptor as a metastasis suppressor gene, providing a starting point for the development of novel therapeutic strategies for the treatment of human cancer. Cancer Res . 2009 Jan 15;69(2):501-9. Cancer Research 19147563 https://hdl.handle.net/20.500.12105/27245 CARCINOMA RAS MICE MUTATION CHEMOKINE PROGNOSTIC-FACTOR C-MET GENE-EXPRESSION HEPATOCYTE GROWTH FACTOR BREAST CANCER METASTASIS Thyroid hormone receptor beta1 acts as a potent suppressor of tumor invasiveness and metastasis.