mRNA Expression profiles for prostate cancer following fractionated irradiation are influenced by p53 status

Charles B. Simone, Molykutty John-Aryankalayil, Sanjeewani T. Palayoor, Adeola Y. Makinde, David Cerna, Michael T. Falduto, Scott R. Magnuson, C. Norman Coleman

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We assessed changes in cell lines of varying p53 status after various fractionation regimens to determine if p53 influences gene expression and if multifractionated (MF) irradiation can induce molecular pathway changes. LNCaP (p53 wild-type), PC3 (p53 null), and DU145 (p53 mutant) prostate carcinoma cells received 5 and 10 Gy as single-dose (SD) or MF (0.5 Gy × 10, 1 Gy × 10, and 2 Gy × 5) irradiation to simulate hypofractionated and conventionally fractionated prostate radiotherapies, respectively. mRNA analysis revealed 978 LNCaP genes differentially expressed (greater than two-fold change, P <.05) after irradiation. Most were altered with SD (69%) and downregulated (75%). Fewer PC3 (343) and DU145 (116) genes were induced, with most upregulated (87%, 89%) and altered with MF irradiation. Gene ontology revealed immune response and interferon genes most prominently expressed after irradiation in PC3 and DU145. Cell cycle regulatory (P = 9.23 × 10-73, 14.2% of altered genes, nearly universally downregulated) and DNA replication/repair (P = 6.86 × 10-30) genes were most prominent in LNCaP. Stress response and proliferation genes were altered in all cell lines. p53-activated genes were only induced in LNCaP. Differences in gene expression exist between cell lines and after varying irradiation regimens that are p53 dependent. As the duration of changes is ≥24 hours, it may be possible to use radiation-inducible targeted therapy to enhance the efficacy of molecular targeted agents.

Original languageEnglish (US)
Pages (from-to)573-585
Number of pages13
JournalTranslational Oncology
Issue number5
StatePublished - Oct 2013
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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