Abstract |
The thyroid hormone, 3,3',5-triiodo-L-thyronine (T3), regulates cell growth, development and differentiation via interactions with thyroid hormone receptors (TR), but the mechanisms underlying T3-mediated modulation of cancer progression are currently unclear. Lipocalin 2 (LCN2), a tumor-associated protein, is overexpressed in a variety of cancer types. Oligonucleotide microarray, coupled with proteomic analysis, has revealed that LCN2 is positively regulated by T3/TR. However, the physiological role and pathway of T3-mediated regulation of LCN2 in hepatocellular carcinogenesis remain to be characterized. Upregulation of LCN2 after T3 stimulation was observed in a time- and dose-dependent manner. Additionally, TRE on the LCN2 promoter was identified at positions -1444/-1427. Overexpression of LCN2 enhanced tumor cell migration and invasion, and conversely, its knockdown suppressed migration and invasion, both in vitro and in vivo. LCN2-induced migration occurred through activation of the Met/FAK cascade. LCN2 was overexpressed in clinical hepatocellular carcinoma (HCC) patients, compared with normal subjects, and positively correlated with TRα levels. Both TRα and LCN2 showed similar expression patterns in relation to survival rate, tumor grade, tumor stage and vascular invasion. Our findings collectively support a potential role of T3/TR in cancer progression through regulation of LCN2 via the Met/FAK cascade. LCN2 may thus be effectively utilized as a novel marker and therapeutic target in HCC.
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Authors | I-Hsiao Chung, Cheng-Yi Chen, Yang-Hsiang Lin, Hsiang-Cheng Chi, Ya-Hui Huang, Pei-Ju Tai, Chia-Jung Liao, Chung-Ying Tsai, Syuan-Ling Lin, Meng-Han Wu, Ching-Ying Chen, Kwang-Huei Lin |
Journal | Oncotarget
(Oncotarget)
Vol. 6
Issue 17
Pg. 15050-64
(Jun 20 2015)
ISSN: 1949-2553 [Electronic] United States |
PMID | 25940797
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Acute-Phase Proteins
- LCN2 protein, human
- Lipocalin-2
- Lipocalins
- Proto-Oncogene Proteins
- Receptors, Thyroid Hormone
- Thyroid Hormones
- Triiodothyronine
- MET protein, human
- Proto-Oncogene Proteins c-met
- Focal Adhesion Kinase 1
- PTK2 protein, human
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Topics |
- Acute-Phase Proteins
(genetics, metabolism)
- Animals
- Blotting, Western
- Cell Line, Tumor
- Cell Movement
(genetics)
- Focal Adhesion Kinase 1
(genetics, metabolism)
- Gene Expression Regulation, Neoplastic
(drug effects)
- Hep G2 Cells
- Humans
- Lipocalin-2
- Lipocalins
(genetics, metabolism)
- Liver Neoplasms
(genetics, metabolism, pathology)
- Mice, SCID
- Neoplasm Invasiveness
- Proto-Oncogene Proteins
(genetics, metabolism)
- Proto-Oncogene Proteins c-met
(genetics, metabolism)
- Receptors, Thyroid Hormone
(metabolism)
- Response Elements
(genetics)
- Reverse Transcriptase Polymerase Chain Reaction
- Signal Transduction
(genetics)
- Thyroid Hormones
(metabolism, pharmacology)
- Transplantation, Heterologous
- Triiodothyronine
(metabolism, pharmacology)
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