Similar Datasets
Project description:To investigate DNA methylation patterns in rat mammary carcinomas induced by ionizing radiation.
2018-02-14 | GSE96565 | GEO
Project description:To investigate DNA copy number changes in rat mammary carcinomas induced by ioizing radiation.
2021-08-01 | GSE160514 | GEO
Project description:To investigate DNA copy number changes in rat renal carcinomas induced by ionizing radiation.
2020-10-29 | GSE160419 | GEO
Project description:Understanding the relationship between radiation-induced breast cancer and obesity, together with information on underlying mechanisms, are potentially useful in risk management and prevention of second cancer in patients receiving radiotherapy. The present study aims to develop a novel animal model to study the relationship by combining two Sprague-Dawley rat models of radiation carcinogenesis and diet-induced obesity. Mammary carcinomas were induced in female obese and lean rats by irradiation with 4 Gy of gamma rays. Gene expression of mammary carcinomas and normal mammary tissues were analyzed with Agilent Whole Rat Genome DNA microarray. The result indicated that genes related to translation and oxidative phosphorylation were upregulated in carcinomas of obese rats.
2016-12-25 | GSE72004 | GEO
Project description:DNA copy number alterations in radiation-induced rat mammary carcinomas
| PRJNA673421 | ENA
Project description:Breast cancer ranks top in the incidence among the main sites of female cancer in Japan. The epidemiological study on atomic bomb survivors has suggested that the excess relative risk for breast cancer is higher than any other sites. Little is known, however, about the molecular mechanisms of breast cancer induction by radiation. Therefore, we analyzed here the genome-wide copy number aberration of radiation-induced rat mammary carcinomas using microarray-based comparative genomic hybridization (array-CGH). Mammary carcinomas were induced by 2 Gy gamma irradiation of Sprague-Dawley (SD) rats at 3 or 7 weeks of age. We examined 14 mammary carcinomas induced by gamma-irradiation (2 Gy) and found 26 aberrations including trisomies of chromosomes 4 and 10 in 3 and 1 carcinomas, respectively, and deletion of chromosomes 3q35q36 and 5q32 (Cdkn2a and Cdkn2b region) in 2 and 2 carcinomas, respectively. On the other hand, only one aberration (amplification of chromosome 10q31) was observed in four spontaneous mammary carcinomas. These results suggest that the trisomy of chromosome 4 and deletion of chromosomes 3q35q36 and 5q32 were associated with radiation exposure. We performed aCGH on mammary carcinoma in Sprague-Dawley rat to identify radiation-specific DNA copy number aberration compared with spontaneous mammary carcinoma.
2010-08-08 | E-GEOD-16128 | biostudies-arrayexpress
Project description:Breast cancer ranks top in the incidence among the main sites of female cancer in Japan. The epidemiological study on atomic bomb survivors has suggested that the excess relative risk for breast cancer is higher than any other sites. Little is known, however, about the molecular mechanisms of breast cancer induction by radiation. Therefore, we analyzed here the genome-wide copy number aberration of radiation-induced rat mammary carcinomas using microarray-based comparative genomic hybridization (array-CGH). Mammary carcinomas were induced by 2 Gy gamma irradiation of Sprague-Dawley (SD) rats at 3 or 7 weeks of age. We examined 14 mammary carcinomas induced by gamma-irradiation (2 Gy) and found 26 aberrations including trisomies of chromosomes 4 and 10 in 3 and 1 carcinomas, respectively, and deletion of chromosomes 3q35q36 and 5q32 (Cdkn2a and Cdkn2b region) in 2 and 2 carcinomas, respectively. On the other hand, only one aberration (amplification of chromosome 10q31) was observed in four spontaneous mammary carcinomas. These results suggest that the trisomy of chromosome 4 and deletion of chromosomes 3q35q36 and 5q32 were associated with radiation exposure.
2010-08-09 | GSE16128 | GEO
Project description:Although various mechanisms have been inferred for combinatorial actions of multiple carcinogens, these mechanisms have not been well demonstrated in experimental carcinogenesis models. We evaluated mammary carcinogenesis initiated by combined exposure to various doses of radiation and chemical carcinogens. Female rats at 7 weeks of age were γ-irradiated (0.2–2 Gy) and/or exposed to 1-methyl-1-nitrosourea (20 or 40 mg/kg, single intraperitoneal injection) or 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (40 mg/kg/day by gavage for 10 days) and were observed until 50 weeks of age. The incidence of mammary carcinoma increased steadily as a function of radiation dose in the absence of chemicals; mathematical analysis supported an additive increase when radiation was combined with a chemical carcinogen, irrespective of the chemical species and its dose. Hras mutations were characteristic of carcinomas that developed after chemical carcinogen treatments and were overrepresented in carcinomas induced by the combination of radiation and MNU (but not PhIP), indicating an interaction of radiation and MNU at the level of initiation. The expression profiles of seven classifier genes, previously shown to distinguish two classes of rat mammary carcinomas, categorized almost all examined carcinomas that developed after individual or combined treatments with radiation (1 Gy) and chemicals as belonging to a single class; more comprehensive screening using microarrays and a separate test sample set failed to identify differences in gene expression profiles among these carcinomas. These results suggest that a complex, multilevel interaction underlies the combinatorial action of radiation and chemical carcinogens in the experimental model.
2013-08-29 | GSE44786 | GEO
Project description:Although various mechanisms have been inferred for combinatorial actions of multiple carcinogens, these mechanisms have not been well demonstrated in experimental carcinogenesis models. We evaluated mammary carcinogenesis initiated by combined exposure to various doses of radiation and chemical carcinogens. Female rats at 7 weeks of age were M-NM-3-irradiated (0.2M-bM-^@M-^S2 Gy) and/or exposed to 1-methyl-1-nitrosourea (20 or 40 mg/kg, single intraperitoneal injection) or 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (40 mg/kg/day by gavage for 10 days) and were observed until 50 weeks of age. The incidence of mammary carcinoma increased steadily as a function of radiation dose in the absence of chemicals; mathematical analysis supported an additive increase when radiation was combined with a chemical carcinogen, irrespective of the chemical species and its dose. Hras mutations were characteristic of carcinomas that developed after chemical carcinogen treatments and were overrepresented in carcinomas induced by the combination of radiation and MNU (but not PhIP), indicating an interaction of radiation and MNU at the level of initiation. The expression profiles of seven classifier genes, previously shown to distinguish two classes of rat mammary carcinomas, categorized almost all examined carcinomas that developed after individual or combined treatments with radiation (1 Gy) and chemicals as belonging to a single class; more comprehensive screening using microarrays and a separate test sample set failed to identify differences in gene expression profiles among these carcinomas. These results suggest that a complex, multilevel interaction underlies the combinatorial action of radiation and chemical carcinogens in the experimental model. Mammary cancers were from untreated rats (n = 3) and rats treated with radiation (1 Gy; n = 4), MNU (40 mg/kg; H-rasM-bM-^@M-^Smutated cancers, n = 5; H-rasM-bM-^@M-^Snonmutated cancers, n = 4), PhIP (H-rasM-bM-^@M-^Smutated, n = 1; H-rasM-bM-^@M-^Snonmutated, n = 3), radiation 1 Gy plus MNU (40 mg/kg; H-rasM-bM-^@M-^Smutated, n = 5; H-rasM-bM-^@M-^Snonmutated, n = 4) and radiation 1 Gy plus PhIP (H-rasM-bM-^@M-^Snonmutated , n = 4). Normal mammary tissues were from untreated rats (n = 3).
2013-08-29 | E-GEOD-44786 | biostudies-arrayexpress
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.
2014-10-10 | E-GEOD-56704 | biostudies-arrayexpress