Gene expression profiling can predict the fate of HeLa cells exposed to X-ray irradiation with or without protoporphyrin accumulation

Junko Takahashi, Masaki Misawa, Hitoshi Iwahashi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Protoporphyrin IX (PpIX) enhances the generation of reactive oxygen species in cells following physicochemical interactions with X-rays. To evaluate the use of porphyrins as radio-sensitizers in radiotherapy, the transcriptomic effects of PpIX and/or X-ray irradiation were investigated in HeLa cells. Microarray experiments were performed using Agilent-014,850 Whole Human Genome Microarray 4x44K G4112F (GEO#: GSE61805). We selected the condition corresponding to 1. μg/mL PpIX exposure prior to 3. Gy-irradiation of cells, and collected cells 24. h post irradiation. X-ray exposure at a dose of 3. Gy did not affect cell survival 24. h post irradiation, regardless of the concentration of PpIX. Approximately 50% cells exposed to X-ray irradiation alone (XT) and 70% cells exposed to PpIX treatment for 6. h before X-ray irradiation (PpIX-XT) lost clonogenic ability. Based on p-values ( p<. 0.01), we selected genes for functional analysis. The majority of the regulated genes in the XT and PpIX-XT groups were related to cell cycle arrest. Furthermore, transcriptome analysis of the cells collected 24. h post irradiation revealed the fate of the cells that lost clonogenic ability due to cell cycle arrest.

Original languageEnglish
Pages (from-to)192-194
Number of pages3
JournalGenomics Data
Volume5
DOIs
Publication statusPublished - 2015 Sep 1
Externally publishedYes

Keywords

  • Cancer
  • Photodynamic therapy
  • Protoporphyrin IX (PpIX)
  • Radiotherapy
  • Sensitizer
  • X-ray

ASJC Scopus subject areas

  • Biotechnology
  • Biochemistry
  • Molecular Medicine
  • Genetics

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