Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Gene expression in the liver following exposition to 1Gy ionizing radiation

ABSTRACT: Although major differences in the response of tissues were documented in the literature, the molecular mechanisms underlying tissue radiosensitivity are still fragmentary and need to be study more thoroughly. To this end, a genome wide analysis strategy was used to investigate changes in gene expression in the liver following exposition to ionizing radiation. This follows the tissue survey that was previously initiated with other organs and tends to obtain a comprehensive picture of the molecular events underlying tissue radio sensitivity. Keywords: Ionizing radiation response totalRNA sample from irradiated liver was hybridized against totalRNA sample from non-irradiated liver. 8 dye-swaps have been done.

ORGANISM(S): Mus musculus

SUBMITTER: Alexandre Pawlik

PROVIDER: E-GEOD-5994 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Changes in transcriptome after in vivo exposure to ionising radiation reveal a highly specialised liver response.

Pawlik Alexandre A Delmar Paul P Bosse Sebastien S Sainz Laurie L Petat Cyrille C Pietu Genevieve G Thierry Dominique D Tronik-Le Roux Diana D

International journal of radiation biology 20090801 8

<h4>Purpose</h4>To identify transcriptional gene-networks involved in the early in vivo response of liver cells to radiation exposure and improve our understanding of the molecular processes responsible for tissue radiosensitivity.<h4>Materials and methods</h4>Transcriptome variations of liver RNA samples were measured 3 hours post-irradiation using microarray technology. The results were confirmed and extended using real-time polymerase-chain-reaction (RT-PCR).<h4>Results</h4>We identified quan ...[more]

PMID: 19637078

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Project description:Densely ionizing radiation is a major component of the space radiation environment and has potentially greater carcinogenic effect compared to sparsely ionizing radiation that is prevalent in the terrestrial environment. It is unknown to what extent the irradiated microenvironment contributes to the differential carcinogenic potential of densely ionizing radiation. To address this gap, 10-week old BALB/c mice were irradiated with 100 cGy sparsely ionizing g-radiation or 10, 30, or 80 cGy of densely ionizing, 350 MeV/amu Si particles and transplanted 3 days later with syngeneic Trp53 null mammary fragments. Tumor appearance was monitored for 600 days. Tumors arising in Si-particle irradiated mice had a shorter median time to appearance, grew faster and were more likely to metastasize. Most tumors arising in sham-irradiated mice were ER-positive, pseudo-glandular and contained both basal keratin 14 and luminal keratin 8/18 cells (designated K14/18), while most tumors arising in irradiated hosts were K8/18 positive (designated K18) and ER negative. Comparison of K18 vs K14/18 tumor expression profiles showed that genes increased in K18 tumors were associated with ERBB2 and KRAS while decreased genes overlapped with those down regulated in metastasis and by loss of E-cadherin. Consistent with this, K18 tumors grew faster than K14/18 tumors and more mice with K18 tumors developed lung metastases compared to mice with K14/18 tumors. However, K18 tumors arising in Si-particle irradiated mice grew even faster and were more metastatic compared to control mice. A K18 Si-irradiated host profile was enriched in genes involved in mammary stem cells, stroma, and Notch signaling. Thus systemic responses to densely ionizing radiation enriches for a ER-negative, K18-positive tumor, whose biology is more aggressive compared to similar tumors arising in non-irradiated hosts. Key Words: ionizing radiation; breast cancer; heavy ion radiation;initiation; promotion 3 different dose of Si were used. Total RNA was extracted from mammary tumors derived from transplantations of non-irradiated p53null mammary fragments into irradiated hosts. We analyzed a total of 45 Trp53-null tumors: 18 from sham-irradiated hosts, 9 from 10 cGy Si-irradiated hosts, 10 from 30 cGy Si-irradiated hosts, and 8 from irradiated hosts.

Dataset Information

Gene expression in the liver following exposition to 1Gy ionizing radiation

Publications

Changes in transcriptome after in vivo exposure to ionising radiation reveal a highly specialised liver response.

Similar Datasets

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