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Oncogene. 2021 Sep;40(37):5613-5625. doi: 10.1038/s41388-021-01961-9. Epub 2021 Jul 27.

B-Myb accelerates colorectal cancer progression through reciprocal feed-forward transactivation of E2F2.

Oncogene

Xiaoyan Fan, Yitao Wang, Tinghui Jiang, Tao Liu, Yuelei Jin, Kailong Du, Yulong Niu, Chunxue Zhang, Zhongyu Liu, Yunlong Lei, Youquan Bu

Affiliations

  1. Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China.
  2. Dermopathic Research Institute, Taizhou University Hospital, Taizhou University, Taizhou, China.
  3. Molecular Medicine and Cancer Research Center, Chongqing Medical University, Chongqing, 400016, China.
  4. Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China. [email protected].
  5. Molecular Medicine and Cancer Research Center, Chongqing Medical University, Chongqing, 400016, China. [email protected].
  6. Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Chongqing Medical University, Chongqing, 400016, China. [email protected].
  7. Molecular Medicine and Cancer Research Center, Chongqing Medical University, Chongqing, 400016, China. [email protected].

PMID: 34316028 PMCID: PMC8445821 DOI: 10.1038/s41388-021-01961-9

Abstract

B-Myb is an important transcription factor that plays a critical role in gene expression regulation and tumorigenesis. However, its functional implication in colorectal cancer remains elusive. In this study, we found that B-Myb was significantly upregulated at both mRNA and protein levels in colorectal cancer samples compared to non-tumor counterparts. B-Myb overexpression accelerated cell proliferation, cell cycle progression and cell motility in colorectal cancer cells, and promoted tumor growth in orthotopic nude mouse models in vivo. In contrast, B-Myb depletion inhibited these malignant phenotypes. Mechanistic investigations revealed that E2F2 was a novel transcriptional target of B-Myb and is essential to B-Myb-induced malignant phenotypes. Notably, B-Myb and E2F2 exhibited positive expression correlation, and interacted with each other in colorectal cancer cells. In addition to their autoregulatory mechanisms, B-Myb and E2F2 can also directly transactivate each other, thus constituting consolidated reciprocal feed-forward transactivation loops. Moreover, both B-Myb and E2F2 are required for the activation of ERK and AKT signaling pathways in colorectal cancer cells. Taken together, our data clarified a critical role for B-Myb in colorectal cancer and unraveled an exquisite mutual collaboration and reciprocal cross regulation between B-Myb and E2F2 that contribute to the malignant progression of human colorectal cancer.

© 2021. The Author(s).

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