Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of human MCF7/BUS cell culture exposed to xenoestrogens

ABSTRACT: MCF7 cells were exposed to xenoestrogens (vehicle = 0.1% ethanol, 30 pM 17beta-estradiol, 3 micromolar genistein, 10 micromolar genistein, 1 micomolar daidzein, 10 nM bisphenol A, 10 nM para-nonylphenol, 3 nM PPT) for 48 hours. Experiment Overall Design: MCF7/BUS cells were exposed to xenoestrogens for 48 hours. Experiments were repeated three times independently.

ORGANISM(S): Homo sapiens

SUBMITTER: Toshi Shioda

PROVIDER: E-GEOD-5200 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Importance of dosage standardization for interpreting transcriptomal signature profiles: evidence from studies of xenoestrogens.

Shioda Toshi T Chesnes Jessica J Coser Kathryn R KR Zou Lihua L Hur Jingyung J Dean Kathleen L KL Sonnenschein Carlos C Soto Ana M AM Isselbacher Kurt J KJ

Proceedings of the National Academy of Sciences of the United States of America 20060801 32

To obtain insights into similarities and differences in the biological actions of related drugs or toxic agents, their transcriptomal signature profiles (TSPs) have been examined in a large number of studies. However, many such reports did not provide proper justification for the dosage criteria of each agent. Using a well characterized cell culture model of estrogen-dependent proliferation of MCF7 human breast cancer cells, we demonstrate how different approaches to dosage standardization exert ...[more]

PMID: 16882715

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Project description:To obtain comprehensive information on 17beta-estradiol (E2) sensitivity of genes that are inducible or suppressible by this hormone, we designed a method that determines ligand sensitivities of large numbers of genes using DNA microarray and a set of simple Perl computer scripts implementing the standard metric statistics, and employed it to characterize effects of low (0-100 pM) concentrations of E2 on the transcriptome profile of MCF7/BUS human breast cancer cells, whose E2 dose-dependent growth curve saturated with 100 pM E2. Evaluation of changes in mRNA expression for all genes covered by the DNA microarray indicated that, at a very low concentration (10 pM), E2 suppressed 3~5 times larger numbers of genes than it induced, whereas at higher concentrations (30-100 pM) it induced 1.5~2 times more genes than it suppressed. Using clearly defined statistical criteria, E2-inducible genes were categorized into several classes based on their E2 sensitivities. This approach of hormone sensitivity analysis revealed that expression of two previously reported E2-inducible autocrine growth factors, TGF-? and SDF-1, was not affected by 100 pM and lower concentrations of E2 but strongly enhanced by 10 nM E2, which was far higher than the concentration that saturated the E2 dose-dependent growth curve of MCF7/BUS cells. These observations suggested that biological actions of E2 are derived from expression of multiple genes whose E2 sensitivities differ significantly and, hence, dependent on the E2 concentration especially when it is lower than the saturating level, emphasizing the importance of characterizing the ligand dose-dependent aspects of E2 actions. (paper abstract) Keywords: Dose Response, Time Course MCF7/BUS cells were exposed to varying concentrations of 17beta-estradiol (E2) for 48 hours. Experiments were repeated five times independently. In another experiment, MCF7/BUS cells were subjected to hormone starvation. At day 0, 1, and 2, RNA samples were isolated from cell culture. Experiments were repeated three times independently.

Dataset Information

Transcription profiling of human MCF7/BUS cell culture exposed to xenoestrogens

Publications

Importance of dosage standardization for interpreting transcriptomal signature profiles: evidence from studies of xenoestrogens.

Similar Datasets

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