| Autor: |
Xi Xiao Huang, Ley Moy Ng, Po-Hsien Lee, Peiyong Guan, Mun Juinn Chow, Aisyah Binte Mohamed Bashir, Meina Lau, Kenric Yi Shu Tan, Zhimei Li, Jason Yongsheng Chan, Jing Han Hong, Sheng Rong Ng, Hsiang Ling Teo, Daniela Rhodes, Patrick Tan, Puay Hoon Tan, Donald P. McDonnell, Bin Tean Teh |
| Rok vydání: |
2022 |
| Popis: |
Point mutations in the ligand binding domain of retinoic acid receptor alpha (RARα) have been implicated in breast fibroepithelial tumors development. However, their role in the tumorigenesis of solid tumors is currently unknown. In this study, using a combination of biochemical and cellular assays, we evaluated the functional consequences of known tumor associated RARα mutations on retinoic acid signaling. All of the clinically associated mutants tested showed diminished transcriptional activities compared to wild type RARα. These mutants also exhibited a dominant negative effect, an activity which has previously been linked to developmental defects and tumor formation in mice. X-ray crystallography showed that mutants remain relatively intact structurally and the loss of transcriptional activity is due to altered co-activator recruitment. In agreement with our biochemical analyses, transcriptomics and cell growth analysis showed that the mutant RARα proteins confer resistance to growth inhibition in the presence of its ligand in phyllodes tumor cells. Although the mutations impair the receptor responses to retinoic acid, certain mutant RARα are partially reactivatable with alternative synthetic agonists. Our data provide insights into the mechanisms by which RARα mutations impact tumorigenesis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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