Methylseleninic acid superactivates p53-senescence cancer progression barrier in prostate lesions of pten-knockout mouse

Lei Wang, Xiaolan Guo, Ji Wang, Cheng Jiang, Maarten C. Bosland, Junxuan Lü, Yibin Deng

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Monomethylated selenium (MM-Se) forms that are precursors of methylselenol, such as methylseleninic acid (MSeA), differ in metabolism and anticancer activities in preclinical cell and animal models from seleno-methionine that had failed to exert preventive efficacy against prostate cancer in North American men. Given that human prostate cancer arises from precancerous lesions such as high-grade prostatic intraepithelial neoplasia (HG-PIN), which frequently have lost phosphatase and tensin homolog (PTEN) tumor suppressor permitting phosphatidylinositol-3-OH kinase (PI3K)-protein kinase B (AKT) oncogenic signaling, we tested the efficacy of MSeA to inhibit HG-PIN progression in Pten prostatespecific knockout (KO) mice and assessed the mechanistic involvement of p53-mediated cellular senescence and of the androgen receptor (AR). We observed that short-term (4 weeks) oral MSeA treatment significantly increased expression of P53 and P21Cip1 proteins and senescence-associated-b-galactosidase staining, and reduced Ki67 cell proliferation index in Pten KO prostate epithelium. Long-term (25 weeks) MSeA administration significantly suppressed HG-PIN phenotype, tumor weight, and prevented emergence of invasive carcinoma in Pten KO mice. Mechanistically, the long-term MSeA treatment not only sustained P53-mediated senescence, but also markedly reduced AKT phosphorylation and AR abundance in the Pten KO prostate. Importantly, these cellular and molecular changes were not observed in the prostate of wild-type littermates which were similarly treated with MSeA. Because p53 signaling is likely to be intact in HG-PIN compared with advanced prostate cancer, the selective superactivation of p53-mediated senescence by MSeA suggests a new paradigm of cancer chemoprevention by strengthening a cancer progression barrier through induction of irreversible senescence with additional suppression of AR and AKT oncogenic signaling.

Original languageEnglish (US)
Pages (from-to)35-42
Number of pages8
JournalCancer Prevention Research
Volume9
Issue number1
DOIs
StatePublished - Jan 2016

Bibliographical note

Funding Information:
This work was supported by grants R21 CA155522 (to Y. Deng and J. Lu¨) and R01 CA172169 (to J. Lu¨, Y. Deng, and M. Bosland) from the NCI, NIH. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Publisher Copyright:
© 2015 American Association for Cancer Research.

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