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Expression data in HTETOP cells following tetracycline or dexrazoxane treatment

ABSTRACT: HTETOP cells, derived from the human fibrosarcoma cell line HT1080, express human topoisomearse II α (TOP2A) exclusively from a tetracycline (TET)-regulated transgene, we used HTETOP cells to differentiate between TOP2A-dependent and –independent apoptotic effects of doxorubicin and dexrazoxane. We used microarrays to detect global transcriptional changes in HTETOP cells following tetracycline doxycycline or dexrazoxane treatment. Keywords: Drug treatment comparison

ORGANISM(S): Homo sapiens

PROVIDER: GSE14886 | GEO | 2009/02/19

SECONDARY ACCESSION(S): PRJNA111951

REPOSITORIES: GEO

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Expression data in HTETOP cells following tetracycline or dexrazoxane treatment

Project description:HTETOP cells, derived from the human fibrosarcoma cell line HT1080, express human topoisomearse II α (TOP2A) exclusively from a tetracycline (TET)-regulated transgene, we used HTETOP cells to differentiate between TOP2A-dependent and –independent apoptotic effects of doxorubicin and dexrazoxane. We used microarrays to detect global transcriptional changes in HTETOP cells following tetracycline doxycycline or dexrazoxane treatment. Keywords: Drug treatment comparison HTETOP cells were treated with 1 µg/ml doxycycline to inhibit TOP2A expression or vehicle for 24 hours, doxycycline-induced trascriptional changes were identified by comparison of the two groups. HTETOP cells were treated with 100 µM dexrazoxane to inhibit TOP2A activity or vehicle for 24 hours, global trascriptional changes were identified by comparison of the two groups.

2009-02-19 | E-GEOD-14886 | biostudies-arrayexpress

Acute expression of cyclin D1 in mouse mammary gland using the tetracycline system

Project description:Analysis of mammary glands from tet-inducible (rtTA) transgenic mice expressing cyclin D1 (Ccnd1). MMTV-rtTA transgenic mice (MMTV-Mouse Mammary Tumor Virus promoter) were cross-mated to cyclin D1 transgenic mice under the control of the tet operon. 8-week-old tetracycline-inducible cyclin D1/rtTA bi-transgenic pregnant female mice (12 days postcoitus) were treated with doxycycline through drinking water supplementation at a final concentration of 2 mg/ml. Control mice were rtTA transgenics alone and were treated in the same manner. After 7 days of doxycycline treatment, the mice were sacrificed and mammary glands taken for RNA isolation. Results provide insight into the in vivo gene expression pattern regulated by cyclin D1 through acute induction. Two separate control mice positive for the MMTV-rtTA transgene were compared to 3 separate cyclin D1/rtTA bi-transgenic female mice.

2012-02-10 | E-GEOD-35076 | biostudies-arrayexpress

Acute expression of cyclin D1 in mouse mammary gland using the tetracycline system

2012-02-10 | GSE35076 | GEO

MCF7 tet-off cells treated or not with 80 ng/ml doxycycline for 12d

Project description:Tet-on and tet-off systems are among the most popular vector systems for inducible transgene expression in mammalian cells. In tet-regulated systems the expression of the transgene depends on the presence or absence of the antibiotic tetracycline or its derivative doxycycline, which are added to the cell culture medium in concentrations considered to be far below cytotoxic levels. Therefore, potential effects on the treated cells, which are exerted by the antibiotic itself and unrelated to transgene expression, are often ignored. We examined the influence of low dose doxycycline on the transcriptional profile of two independent clones of MCF7 human breast carcinoma cells, transfected with tet-off regulator and response plasmids but not harboring any transgene. Treatment with 80 ng/ml doxycycline for 12 days markedly altered gene expression in these cells. Many genes associated with interferon-signaling were up-regulated while cell cycle-associated genes were down-regulated, which was also accompanied by a reduction of cell growth. These results highlight the importance of appropriate controls when working with tet-regulated gene expression systems, to allow distinction between the effects of transgene expression and potential “side effects” of the antibiotic used for its regulation.

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Proteomic profiling of HT1080 fibrosarcoma cells of mesenchymal or amoeboid migratory phenotype

Project description:Amoeboid and mesenchymal migration of cancer cells both contribute to metastatic spreading of tumors. To characterize proteome changes underlying the different migratory modes, we performed mass spectrometry profiling of HT1080 fibrosarcoma cells undergoing mesenchymal-amoeboid transition induced by either doxycycline-inducible constitutively active RhoA or dasatinib treatment. Cells were kept in three-dimensional collagen gels with or without induction for 48 hours, lysed and processed for mass spectrometry analysis. In case of the inducible RhoA system, we also performed parallel two-dimensional experiments with cells on top of a dense layer of collagen (it was not feasible with dasatinib treatment).

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Targets of cytostatic drugs in HT1080 fibrosarcoma

Project description:HT1080 fibrosarcoma cells were treated with cytostatic drugs and analysed on Affymetrix microarray to identify genes and pathways regulated by these compounds. The array images were processed using Affymetrix MAS 5.0 software. and normalized by global scaling or scaled to a polyA+ spike mask Keywords = Cytostatic drugs Keywords = Actinomycin D Keywords = Doxorubicin Keywords = Vincristine Keywords = apoptosis Keywords: ordered

2006-02-04 | GSE2238 | GEO

Transcriptomic profiling of HT1080 fibrosarcoma cells of mesenchymal or amoeboid migratory phenotype

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2019-07-29 | E-MTAB-6823 | biostudies-arrayexpress

Gene expression profiles of amiodarone, valproic acid, and tetracycline induced steatosis in C57BL/6 mice

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2014-02-25 | GSE48126 | GEO

Tetracycline-treated Litomosoides sigmodontis vs. untreated control Litomosoides sigmodontis

Project description:The filarial nematodes Brugia malayi, Wuchereria bancrofti and Onchocerca volvulus cause elephantiasis, dermatitis and blindness, resulting in severe morbidity in developing countries. 1.3 billion people are at risk of infection. Targeting the essential Wolbachia endobacteria of filarial nematodes with doxycycline has proven to be an effective therapy, resulting in a block in embryogenesis and worm development, and macrofilaricidal effects. However, doxycycline is contraindicated for a large portion of the at-risk population. To identify new targets for anti-wolbachial therapy, understanding the molecular basis of the Wolbachia-filaria symbiosis is required. We performed cross-species hybridization by using the Brugia malayi microarray to identify differentially expressed genes in the rodent filaria Litomosoides sigmodontis after depletion of Wolbachia which therefore might have a role in symbiosis. Female adult Litomosoides sigmodontis from patent infections were treated with tetracycline to deplete endosymbiotic Wolbachia bacteria. RNA from tetracycline-treated Litomosoides sigmodontis was compared to untreated age-matched control worms. This experiment was performed for three different timepoints: day 6, 15 and 36 of tetracycline treatment. One biological replicate was performed each with two technical replicates (dye-flip replicates).

2010-04-07 | E-GEOD-20976 | biostudies-arrayexpress

Notch1 activation and TGF-beta stimulation in transformed human esophageal cells

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