CREB1 contributes colorectal cancer cell plasticity by regulating lncRNA CCAT1 and NF-κB pathways

The CREB1 gene encodes an exceptionally pleiotropic transcription factor that frequently dysregulated in human cancers. CREB1 can regulate tumor cell status of proliferation and/or migration; however, the molecular basis for this switch involvement in cell plasticity has not fully been understood ye...

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Published in:Science China. Life sciences 2022-08, Vol.65 (8), p.1481-1497
Main Authors: Li, Bin, Zheng, Lisi, Ye, Jiayi, Zhang, Chenmin, Zhou, Jie, Huang, Qiaojuan, Guo, Yanhua, Wang, Luqin, Yu, Peng, Liu, Shurong, Lin, Qiao, Luo, Yuxia, Zhou, Hui, Yang, Jianhua, Qu, Lianghu
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Cancer
Cell proliferation
Colorectal cancer
Colorectal carcinoma
Cover Article
Inflammation
Life Sciences
Mesenchyme
Myc protein
NF-κB protein
Non-coding RNA
Phenotypes
Plasticity
Signal transduction
Tumors
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Summary:The CREB1 gene encodes an exceptionally pleiotropic transcription factor that frequently dysregulated in human cancers. CREB1 can regulate tumor cell status of proliferation and/or migration; however, the molecular basis for this switch involvement in cell plasticity has not fully been understood yet. Here, we first show that knocking out CREB1 triggers a remarkable effect of epithelial-mesenchymal transition (EMT) and leads to the occurrence of inhibited proliferation and enhanced motility in HCT116 colorectal cancer cells. By monitoring 45 cellular signaling pathway activities, we find that multiple growth-related pathways decline significantly while inflammatory pathways including NF-κB are largely upregulated in comparing between the CREB1 wild-type and knocked out cells. Mechanistically, cells with CREB1 knocked out show downregulation of MYC as a result of impaired CREB1-dependent transcription of the oncogenic lncRNA CCAT1. Interestingly, the unbalanced competition between the coactivator CBP/p300 for CREB1 and p65 leads to the activation of the NF-κB pathway in cells with CREB1 disrupted, which induces an obvious EMT phenotype of the cancer cells. Taken together, these studies identify previously unknown mechanisms of CREB1 in CRC cell plasticity via regulating lncRNA CCAT1 and NF-κB pathways, providing a critical insight into a combined strategy for CREB1-targeted tumor therapies.
ISSN:1674-7305
1869-1889
DOI:10.1007/s11427-022-2108-x