Abstract
Mutations in p53 occur at a rate of approximately 70% in hormone-refractory prostate cancer (CaP), suggesting that p53 mutations facilitate the progression of CaP to androgen-independent (AI) growth. We have previously reported that transfection of p53 gain of function mutant alleles into LNCaP, an androgen-sensitive cell line, allows for AI growth of LNCaP in vitro. We herein confirm the in vivo relevance of those findings by demonstrating that the R273H p53 mutation (p53R273H) facilitates AI growth in castrated nude mice. In addition, we demonstrate that H2 relaxin is responsible for facilitating p53R273H-mediated AI CaP. H2 relaxin is overexpressed in the LNCaP-R273H subline. Downregulation of H2 relaxin expression results in significant inhibition of AI growth, whereas addition of recombinant human H2 relaxin to parental LNCaP promotes AI growth. Inhibition of AI growth was also achieved by blocking expression of LGR7, the cognate receptor of H2 relaxin. Chromatin immunoprecipitation analysis was used to demonstrate that p53R273H binds directly to the relaxin promoter, further confirming a role for H2 relaxin signaling in p53R273H-mediated AI CaP. Lastly, we used a reporter gene assay to demonstrate that H2 relaxin can induce the expression of prostate-specific antigen via an androgen receptor-mediated pathway.
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Abbreviations
- AI:
-
androgen independent
- CaP:
-
prostate cancer
- ChIP:
-
chromatin immunoprecipitation
- R273H p53 mutation:
-
p53R273H
- CSS:
-
charcoal-stripped serum
- rh:
-
recombinant human
- GOF:
-
gain of function
- LOF:
-
loss of function
- RNAi:
-
RNA interference
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Acknowledgements
This study was funded by NCI RO1 CA77612 (RLV, XBS, RGE, DVW) and NCI RO192069 (XBS, RGE, DVW) grants. We thank Dr Philip Mack for his useful suggestions during this study, and Dr Arline Deitch for her careful reading of the manuscript. We also thank Dr Parlow of the National Hormone and Peptide Program for providing us with the recombinant human H2 relaxin.
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Vinall, R., Tepper, C., Shi, XB. et al. The R273H p53 mutation can facilitate the androgen-independent growth of LNCaP by a mechanism that involves H2 relaxin and its cognate receptor LGR7. Oncogene 25, 2082–2093 (2006). https://doi.org/10.1038/sj.onc.1209246
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DOI: https://doi.org/10.1038/sj.onc.1209246
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