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A positive feedback between p53 and miR-34 miRNAs mediates tumor suppression

Open access
Okada, Nobuhiro, Lin, Chao-Po, Ribeiro, Marcelo C., Biton, Anne, Lai, Gregory, He, Xingyue, Bu, Pengcheng, Vogel, Hannes, Jablons, David M., Keller, Andreas C., Wilkinson, J. Erby, He, Biao, Speed, Terry P., He, Lin·2014·Genes & Development

Abstract

As bona fide p53 transcriptional targets, miR-34 microRNAs (miRNAs) exhibit frequent alterations in many human tumor types and elicit multiple p53 downstream effects upon overexpression. Unexpectedly, miR-34 deletion alone fails to impair multiple p53-mediated tumor suppressor effects in mice, possibly due to the considerable redundancy in the p53 pathway. Here, we demonstrate that miR-34a represses HDM4 , a potent negative regulator of p53, creating a positive feedback loop acting on p53. In a Kras -induced mouse lung cancer model, miR-34a deficiency alone does not exhibit a strong oncogenic effect. However, miR-34a deficiency strongly promotes tumorigenesis when p53 is haploinsufficient, suggesting that the defective p53– miR-34 feedback loop can enhance oncogenesis in a specific context. The importance of the p53/ miR-34 /HDM4 feedback loop is further confirmed by an inverse correlation between miR-34 and full-length HDM4 in human lung adenocarcinomas. In addition, human lung adenocarcinomas generate an elevated level of a short HDM4 isoform through alternative polyadenylation. This short HDM4 isoform lacks miR-34 -binding sites in the 3′ untranslated region (UTR), thereby evading miR-34 regulation to disable the p53- miR-34 positive feedback. Taken together, our results elucidated the intricate cross-talk between p53 and miR-34 miRNAs and revealed an important tumor suppressor effect generated by this positive feedback loop.

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Metadata

Authors
Okada, N., Lin, C.-P., Ribeiro, M. C., Biton, A., Lai, G., He, X., Bu, P., Vogel, H., Jablons, D. M., Keller, A. C., Wilkinson, J. E., He, B., Speed, T. P., & He, L.
Venue
Genes & Development
Published
2014-02-14
Volume
28
Issue
5
Pages
438-450
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2037647570
Cited by
297
References
17
Type
posted content
Language
en
Open access
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CoChat. (2026). Citation check: A positive feedback between p53 and miR-34 miRNAs mediates tumor suppression. https://app.cochat.ai/papers/10.1101/gad.233585.113
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Okada, N., Lin, C.-P., Ribeiro, M. C., Biton, A., Lai, G., He, X., Bu, P., Vogel, H., Jablons, D. M., Keller, A. C., Wilkinson, J. E., He, B., Speed, T. P., & He, L. (2014). A positive feedback between p53 and miR-34 miRNAs mediates tumor suppression. Genes & Development. https://doi.org/10.1101/gad.233585.113

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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