Unknown,Transcriptomics,Genomics,Proteomics

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Characterization of protoporphytin IX effects on X-ray irradiation in Hela cells in vitro

ABSTRACT: Hela cells were used to evaluate the protoporphytin IX (PpIX) effects on X-ray irradiation. Treatment conditions were (1) control group (untreated cells); (2) cells treated with 1 Œºg /ml PpIX for 6 hours; (3) cells irradiated with 3Gy X-rays; (4) cells treated with 1 Œºg /ml PpIX for 6 hours prior to irradiation with 3Gy X-rays. Hela cells gene expressions in 4 groups were measured at 24 hours after exposure to 0 and 3 Gy X-rays plus treatment with PpIX prior to irradiation.

ORGANISM(S): Homo sapiens

SUBMITTER: Junko Takahashi

PROVIDER: E-GEOD-61805 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Biological response X-rays traditionally serves as a standard in comparative analysis of different qualities of ionizing radiation. Most such studies have utilized 2-dimensional culture systems, which may not fully represent responses in 3-dimensional tissues. To gain insight into biological responses to X-rays in tissue, we have profiled global gene expression in EPI-200, a 3-dimensional tissue model that imitates the structure and function of human epidermis, at 4, 16 and 24 hours after exposure to 2.5 Gy of X-rays. The most significant gene ontology groups were associated with cell cycle, cytokinesis, establishment and maintenance of chromatin architecture. Remarkably, genes with a role in cell cycle were predominantly downregulated at all time points while genes involved in the cell defense response - upregulated. Methyltransferases were predominantly upregulated at 4 and 16h while transcription factors - at 16h and 24h suggesting remodeling of the chromatin. Among the genes with a role in signal transduction, irradiation affected kinase modulators and microtubule binding motor proteins at all time points. Kinases, especially non-receptor serine/threonine protein kinases were predominantly upregulated at 16 and 24h suggesting a rearrangement in the signaling pathways. The results also confirm involvement in the biological response of the genes participating in p53 pathway that were overrepresented at 4 and 16h in the set of upregulated genes and ubiquitin proteasome pathway that were predominantly downregulated at 16h and 24h In the same time, growing numbers of altered in expression genes: 449 at 4h; 720 and 3986 genes - at 16 and 24h postirradiation, accordingly suggested that ionizing radiation caused long term changes in the gene expression the exceeded the time frame proposed for this study. Radiation induced gene expression in 3-dimensional tissue model, Epi-200, was measured at 4, 16 and 24 hours after exposure to the dose of 2.5 Gy of X-rays. Three independent experiments were performed in the each time point using one tissue sample per a data point.

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Characterization of protoporphytin IX effects on X-ray irradiation in Hela cells in vitro

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