Abstract
Orthodenticle homeobox (OTX1) is reported to be involved in numerous cancers, but the expression level and molecular function of OTX1 in gallbladder cancer (GBC) remain unknown. Here, we found the elevated level of OTX1 associated with poor prognosis in human gallbladder cancer. In vitro and in vivo studies of human gallbladder cancer cell lines demonstrated that overexpression of OTX1 promoted cell proliferation, whereas the downregulation inhibited it. Additionally, we found a tight correlation between the serum level of taurodeoxycholic acid (TDCA) and OTX1 expression. TDCA-induced activation of YAP1 by phosphorylation inhibition contributed to the transcriptional activation of OTX1. Mechanistically, we identified that OTX1 activated AKT signaling pathway by transactivating the expression of IFITM3 and thus promoted the proliferation of GBC cells. Taken together, our results showed that TDCA-YAP1-dependent expression of OTX1 regulated IFITM3 and affected GBC proliferation via the AKT signaling pathway. Our experiments also suggested that OTX1 is a novel therapeutic target for GBC.
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Data availability
The primary RNA-Seq data generated for this study will be available in a public, open-access repository with an accession number at the time of publication. The public datasets analyzed during the current study are available in the repositories listed below: The Cancer Genome Atlas: TCGA-LUSC; TCGA-LUAD; TCGA-COAD; TCGA-UCEC; TCGA-STAD; TCGA-BRCA; TCGA-PRAD; TCGA-BLCA; TCGA-LIHC; TCGA-CHOL; TCGA-ESCA; TCGA-PAAD; TCGA-KIRP; TCGA-KIRC; TCGA-THCA; TCGA-KICH; TCGA-HNSC; TCGA-ACC; TCGA-LGG; TCGA-MESO; TCGA-SARC. Gene Expression Omnibus: GSE62335; GSE76633; GSE100363; GSE139682.
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Acknowledgements
We are grateful to our laboratory members and professors for their insightful comments. This work was supported by the National Natural Science Foundation of China (Grant number: 82072668).
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WW, HW, and CCZ conceived the project. RFY, LHY, MML, and FYW designed the experiments. RFY, LHY, MML, and FYW performed most of the experiments. YHS, RX, and JJL assisted with the animal experiments and data collection. YYZ, YL, and YJ provided technical suggestions. RFY and FYW wrote the first version of the manuscript. WW and HW revised the manuscript. All authors read and approved the manuscript.
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Yang, R., Yang, L., Long, M. et al. Taurodeoxycholic acid-YAP1 upregulates OTX1 in promoting gallbladder cancer malignancy through IFITM3-dependent AKT activation. Oncogene 42, 1466–1477 (2023). https://doi.org/10.1038/s41388-023-02660-3
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DOI: https://doi.org/10.1038/s41388-023-02660-3
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