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Breast cancer MCF-7 Cells and MDA-MB-435 cells: pre-miR-125b Transfected cells vs. pre-control transfected cells

ABSTRACT: Transcriptional profiling of breast cancer cells comparing pre-control transfected cells with cells transfected with pre-miR-125b. We searched for miR-125b targets by systematic screening of mRNA profiling of pre-miR-125b transfected MCF-7 cells and MDA-MB-435 cells. Two-condition experiment, pre-miR-125b Transfected vs. pre-control Transfected MCF-7 cells. One replicate per array.

ORGANISM(S): Homo sapiens

SUBMITTER: Yan Li

PROVIDER: S-ECPF-GEOD-22546 | biostudies-other |

REPOSITORIES: biostudies-other

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Breast cancer MCF-7 Cells and MDA-MB-435 cells: pre-miR-125b Transfected cells vs. pre-control transfected cells

Project description:Transcriptional profiling of breast cancer cells comparing pre-control transfected cells with cells transfected with pre-miR-125b. We searched for miR-125b targets by systematic screening of mRNA profiling of pre-miR-125b transfected MCF-7 cells and MDA-MB-435 cells.

2010-06-25 | GSE22546 | GEO

Breast cancer MCF-7 Cells and MDA-MB-435 cells: pre-miR-125b Transfected cells vs. pre-control transfected cells

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Cell Fate following Irradiation of MDA-MB-231 and MCF-7 Breast Cancer Cells Pre-Exposed to the Tetrahydroisoquinoline Sulfamate Microtubule Disruptor STX3451.

Project description:A tetrahydroisoquinoline (THIQ) core is able to mimic the A and B rings of 2-methoxyestradiol (2ME2), an endogenous estrogen metabolite that demonstrates promising anticancer properties primarily by disrupting microtubule dynamic instability parameters, but has very poor pharmaceutical properties that can be improved by sulfamoylation. The non-steroidal THIQ-based microtubule disruptor 2-(3-bromo-4,5-dimethoxybenzyl)-7-methoxy-6-sulfamoyloxy-1,2,3,4-tetrahydroisoquinoline (STX3451), with enhanced pharmacokinetic and pharmacodynamic profiles, was explored for the first time in radiation biology. We investigated whether 24 h pre-treatment with STX3451 could pre-sensitize MCF-7 and MDA-MB-231 breast cancer cells to radiation. This regimen showed a clear increase in cytotoxicity compared to the individual modalities, results that were contiguous in spectrophotometric analysis, flow cytometric quantification of apoptosis induction, clonogenic studies and microscopy techniques. Drug pre-treatment increased radiation-induced DNA damage, with statistically more double-strand (ds) DNA breaks demonstrated. The latter could be due to the induction of a radiation-sensitive metaphase block or the increased levels of reactive oxygen species, both evident after compound exposure. STX3451 pre-exposure may also delay DNA repair mechanisms, as the DNA damage response element ataxia telangiectasia mutated (ATM) was depressed. These in vitro findings may translate into in vivo models, with the ultimate aim of reducing both radiation and drug doses for maximal clinical effect with minimal adverse effects.

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