Project description:To test Arabidopsis thaliana radiosensitivity to gamma radiation, 6 days old seedlings were exposed for 48 h to 60-Co source at dose rates 1, 10, 40,100 or 290 mGy/h.
Project description:In order to test Norway spruce radiosensitivity to gamma radiation, 6 days old seedlings were exposed for 48 h to 60-Co source at dose rates 1, 10, 40 or 100 mGy/h.
Project description:We performed comparative RNA sequencing of the early (4 hrs) dose response (0.5 – 200 cGy whole body dose, 10 dose levels) of the mouse aorta to proton and gamma radiation. Total-body proton radiation of conscious animals was performed using a proton beam produced by a cyclotron system, while total-body gamma radiation of animals was performed using a Caesium-137 gamma source. A trend analysis identified genes that showed a dose response, using data permutation to estimate a false discovery rate (q-value) for each gene. We identified 29 and 194 genes (q-value ≤ 0.1) that were upregulated with increasing doses of proton and gamma radiation, respectively. No genes were down-regulated. While fewer genes were dose-responsive to proton radiation, the magnitude of the effect was greater than with gamma radiation. These highly responsive genes were enriched for pathways involved in the response to DNA damage, apoptosis, cellular stress and inflammation (p < 0.01). Gamma radiation responsive genes included the same pathways, but extended to genes in vasculature specific pathways. Genes responsive to both radiation types (19 genes at q-value ≤ 0.1) showed almost perfectly superimposable dose-response relationships. We observed the same superimposable dose response relationship of gamma and proton radiations in a subset of genes validated by quantitative PCR not only in the aorta but also in liver, lung, heart and kidney. Despite a relative similar relative biological effectiveness of protons and gamma photons and the activation of canonical radiation response pathways by both radiation types, we detected marked differences in the genomic response. It seems plausible that these genomic differences translate into differences in the biological processes leading to cardiovascular pathologies.
Project description:Wistar male rats were exposed of cold for one day or 14 days. Control group was placed into room temperature. Gamma delta T cells were FACS sorted from spleen.
Project description:total RNA from mouse (male c57BL/6) spleen labeled with Cy3 vs total RNA from mouse (male c57BL/6) B cells treated with Interferon-gamma (IFN gamma) labeled with Cy5- time course with repeats Keywords: ordered
Project description:Certain mouse strains such as CBA, C3H and RFM, have high incidence of radiation-induced acute myeloid leukemia (AML). The data in this serie was generated by using spleen DNA from CBA mice which were irraidated with either gamma-rays or heavy ion (HZE) particles. Spleen DNA with radiation-induced AML was compared with DNA from normal CBA mice. Comparison of spleen DNA from CBA mice with radiation-induced AML vs genomic DNA from normal CBA mice
Project description:The basidiomycetous fungus Cryptococcus has been known as radiation resistant fungi and is found in highly radioactive environments such as the damaged nuclear reactor at Chernobyl. Although Cryptococcus exhibits greater resistant for gamma radiation than the model yeast Saccharomyces cerevisiae, the resistant mechanism of gamma radiation remains elusive. To elucidate a unique regulatory system for radiation-resistance in C. neoformans, we performed genome-wide comparative analysis through DNA microarray analysis using C. neoformans WT strain (serotype A, H99 strain) responding gamma radiation. Based on the transcriptome analysis, genes involved in DNA damage repair systems (RAD51, RDH54, and RAD54) were significantly increased in response to gamma radiation. Actually, rad54â?? and rdh54â?? mutants exhibited sensitivity against both gamma radiation and DNA damage inducers. Furthermore, genes regarding to molecular chaperone and ubiquitination systems were strongly induced. In contrast, expression levels of genes related to protein synthesis, fatty acids/sterols synthesis, and other cellular molecules. Especially, ergosterol homeostasis is required for gamma radiation resistance. Furthermore, radiation-induced genes such as RIG4, RIG5, and RIG6 in C. neoformans play critical roles in gamma radiation resistance. Taken together, the transcriptome analysis contributes to understanding unique molecular mechanism of radiation-resistant fungus C. neoformans. To elucidate transcriptome change during recovery process post irrdiation, samples were taken at three time interval (30 min, 60 min, and 120 min). The three independent DNA microarry with three independent biological replicates were analyzed to obtain high reliability.
Project description:Certain mouse strains such as CBA, C3H and RFM, have high incidence of radiation-induced acute myeloid leukemia (AML). The data in this serie was generated by using spleen DNA from CBA mice which were irraidated with either gamma-rays or heavy ion (HZE) particles. Spleen DNA with radiation-induced AML was compared with DNA from normal CBA mice.
Project description:Here, male and female B6C3F1 mice were given single or fractionated whole-body exposure(s) to a monoenergetic carbon ion radiotherapy beam at the Heavy Ion Medical Accelerator in Chiba, Japan, matching the radiation quality delivered to the normal tissue ahead of the tumour volume. These mice were then monitored for the remainder of their lifespan and a large number of T cell lymphomas were analysed, alongside those arising in mice exposed to equivalent doses of standard Cs137 gamma ray-irradiation. Using genome-wide DNA copy number analysis to identify genomic loci involved in radiation-induced lymphomagenesis and subsequent detailed analysis of Notch1, Ikaros, Pten, Trp53 and Bcl11b genes we compared the genetic profile of the carbon ion- and gamma ray-induced tumours. The canonical set of genes previously associated with radiation-induced T cell lymphoma was identified in both radiation groups. While the pattern of disruption of the various pathways was somewhat different between the radiation types, most notably Pten mutation frequency and loss of heterozygosity flanking Bcl11b, the most striking finding was the observation of large interstitial deletions at various sites across the genome in carbon ion-induced tumours, which were only seen infrequently in the gamma ray-induced tumours analysed. 32 unique tumours (12 gamma ray-induced, 20 carbon ion-induced) each with sex-matched reference DNA