title: Retinoid X receptor α enhances human cholangiocarcinoma growth through simultaneous activation of Wnt/β-catenin and nuclear factor-κB pathways.
abstract: Retinoid X receptor α (RXRα) plays important roles in the malignancy of several cancers such as human prostate tumor, breast cancer, and thyroid tumor. However, its exact functions and molecular mechanisms in cholangiocarcinoma (CCA), a chemoresistant carcinoma with poor prognosis, remain unclear. In this study we found that RXRα was frequently overexpressed in human CCA tissues and CCA cell lines. Downregulation of RXRα led to decreased expression of mitosis-promoting factors including cyclin D1and cyclin E, and the proliferating cell nuclear antigen, as well as increased expression of cell cycle inhibitor p21, resulting in inhibition of CCA cell proliferation. Furthermore, RXRα knockdown attenuated the expression of cyclin D1 through suppression of Wnt/β-catenin signaling. Retinoid X receptor α upregulated proliferating cell nuclear antigen expression through nuclear factor-κB (NF-κB) pathways, paralleled with downregulation of p21. Thus, the Wnt/β-catenin and NF-κB pathways account for the inhibition of CCA cell growth induced by RXRα downregulation. Retinoid X receptor α plays an important role in proliferation of CCA through simultaneous activation of Wnt/β-catenin and NF-κB pathways, indicating that RXRα might serve as a potential molecular target for CCA treatment.
authors: State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, China.
authors: Gui-Li
authors: GL
authors: Huang
authors: Division of Xiamen Diabetes Institute, The First Affiliated Hospital of Xiamen University, Xiamen, China.
authors: Wei
authors: W
authors: Zhang
authors: Division of Biobank, The First Affiliated Hospital of Xiamen University, Xiamen, China.
authors: Hong-Yue
authors: HY
authors: Ren
authors: State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, China.
authors: Xue-Ying
authors: XY
authors: Shen
authors: State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, China.
authors: Qing-Xi
authors: QX
authors: Chen
authors: Division of Biobank, The First Affiliated Hospital of Xiamen University, Xiamen, China.
authors: Dong-Yan
authors: DY
authors: Shen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001650:Bile Duct Neoplasms / Q000378:metabolism / Q000473:pathology*; D015153:Blotting, Western; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000502:physiology; D002470:Cell Survival / Q000502:physiology; D018281:Cholangiocarcinoma / Q000378:metabolism / Q000473:pathology*; D005260:Female; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D016328:NF-kappa B / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D047490:Retinoid X Receptor alpha / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D014162:Transfection; D051153:Wnt Proteins / Q000378:metabolism; D051176:beta Catenin / Q000378:metabolism
chemical_list: C495270:CTNNB1 protein, human; D016328:NF-kappa B; D047490:Retinoid X Receptor alpha; D051153:Wnt Proteins; D051176:beta Catenin
keywords: Cholangiocarcinoma; NF-κB; proliferation; retinoid X receptor α; β-catenin