4.5 Article

PTBP1 promotes IRES-mediated translation of cyclin B1 in cancer

Journal

ACTA BIOCHIMICA ET BIOPHYSICA SINICA
Volume 54, Issue 5, Pages 696-707

Publisher

SCIENCE PRESS
DOI: 10.3724/abbs.2022046

Keywords

cyclin B1; internal ribosome entry site; PTBP1; interacting trans-acting factors; esophageal squamous cell carcinoma

Funding

  1. National Natural Science Foundation of China [81472661, 81872398]

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This study reveals that the 5'UTR of Cyclin B1 mRNA contains an IRES, which initiates translation of Cyclin B1 and is further activated under cellular stress. PTBP1 promotes the IRES-mediated translation of Cyclin B1 by binding to its 5'UTR and enhances the malignancy of ESCC cells.
Cyclin B1 is an essential cyclin-dependent protein that involves in the G2/M transition. Multiple studies report that cyclin B1 is upregulated in cancers and promotes cancer progression. However, the mechanism of cyclin B1 upregulation remains unclear. Here we report that the 5'UTR of cyclin B1 mRNA contains an internal ribosome entry site (IRES) by using a bicistronic fluorescent reporter. We show that IRES can initiate the translation of cyclin B1, and the IRES-mediated translation is further activated under cell stress. Interacting trans-acting factors (ITAFs) are required by most IRES to initiate the translation. We find that PTBP1 promotes the IRES-mediated translation of cyclin B1 by binding to the 5'UTR of cyclin B1. On top of that, PTBP1 promotes the malignancy of ESCC cells. Our data suggest that the IRES-mediated translation of cyclin B1 plays an essential role in the cyclin B1 upregulation in cancers.

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