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Nutlin-3a Activates p53 to Both Down-regulate Inhibitor of Growth 2 and Up-regulate mir-34a, mir-34b, and mir-34c Expression, and Induce Senescence
Open accessAbstract
Nutlin-3, an MDM2 inhibitor, activates p53, resulting in several types of cancer cells undergoing apoptosis. Although p53 is mutated or deleted in ∼50% of all cancers, p53 is still functionally active in the other 50%. Consequently, nutlin-3 and similar drugs could be candidates for neoadjuvant therapy in cancers with a functional p53. Cellular senescence is also a phenotype induced by p53 activation and plays a critical role in protecting against tumor development. In this report, we found that nutlin-3a can induce senescence in normal human fibroblasts. Nutlin-3a activated and repressed a large number of p53-dependent genes, including those encoding microRNAs. mir-34a, mir-34b, and mir-34c, which have recently been shown to be downstream effectors of p53-mediated senescence, were up-regulated, and inhibitor of growth 2 (ING2) expression was suppressed by nutlin-3a treatment. Two candidates for a p53-DNA binding consensus sequence were found in the ING2 promoter regulatory region; thus, we performed chromatin immunoprecipitation and electrophoretic mobility shift assays and confirmed p53 binding directly to those sites. In addition, the luciferase activity of a construct containing the ING2 regulatory region was repressed after p53 activation. Antisense knockdown of ING2 induces p53-independent senescence, whereas overexpression of ING2 induces p53-dependent senescence. Taken together, we conclude that nutlin-3a induces senescence through p53 activation in normal human fibroblasts, and p53-mediated mir34a, mir34b, and mir34c up-regulation and ING2 down-regulation may be involved in the senescence pathway. [Cancer Res 2008;68(9):3193–203]
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Cited by
Blinded by the Light: The Growing Complexity of p53
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Lamin B1 loss is a senescence-associated biomarker
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miR-221 overexpression contributes to liver tumorigenesis
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Metadata
- Authors
- Kumamoto, K., Spillare, E. A., Fujita, K., Horikawa, I., Yamashita, T., Appella, E., Nagashima, M., Takenoshita, S., Yokota, J., & Harris, C. C.
- Venue
- Cancer Research
- Published
- 2008-05-01
- Volume
- 68
- Issue
- 9
- Pages
- 3193-3203
- ISSN
- 0008-5472 (ISSN-L)
- 1538-7445
- OpenAlex
- W2112880435
- Cited by
- 223
- References
- 17
- FWCI
- 12.94
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Kumamoto, K., Spillare, E. A., Fujita, K., Horikawa, I., Yamashita, T., Appella, E., Nagashima, M., Takenoshita, S., Yokota, J., & Harris, C. C. (2008). Nutlin-3a Activates p53 to Both Down-regulate Inhibitor of Growth 2 and Up-regulate mir-34a, mir-34b, and mir-34c Expression, and Induce Senescence. Cancer Research. https://doi.org/10.1158/0008-5472.can-07-2780
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