GEO DataSets

(Submitter supplied) In this research, we use DNA microarray analysis to clarify the gene expression responses in Jurkat cells after Tamoxifen treatment. Jurkat cells are a dexamethasone-resistant cell line derived from a T-cell Acute Lymphoblastic Leukaemia sample in relapse

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL23986

1 Sample

Download data: TXT

(Submitter supplied) We have previously demonstrated that endoxifen is the most important tamoxifen metabolite responsible for eliciting the anti-estrogenic effects of this drug in breast cancer cells expressing estrogen receptor-alpha. However, the relevance of estrogen receptor-beta in mediating endoxifen action has yet to be explored. Therefore, the goals of this study were to determine the differences in the global gene expression profiles elicited by estradiol treatment and endoxifen between parental MCF7 breast cancer cells (expressing estrogen receptor alpha only) and MCF7 cells stably expressing estrogen receptor beta.

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6947

12 Samples

Download data: IDAT, TXT

(Submitter supplied) To support cellular homeostasis and mitigate chemotherapeutic stress, cancer cells must gain a series of adaptive intracellular processes. Here we identify that NUPR1, a tamoxifen (Tam)-induced transcriptional coregulator, is necessary for the maintenance of Tam resistance through physical interaction with ESR1 in breast cancers. Mechanistically, NUPR1 binds to the promoter regions of several genes involved in autophagy process and drug resistance such as BECN1, GREB1, RAB31, PGR, CYP1B1, and regulates their transcription. more...

Organism:

Homo sapiens

Type:

Expression profiling by high throughput sequencing

Platform:

GPL16791

3 Samples

Download data: TXT

(Submitter supplied) Adjuvant tamoxifen therapy for invasive breast cancer improves patient survival but comes with side effects that impact health and quality of life. Partly due to a lack of proven animal models, the tissues and cells that mediate these negative side effects are largely unknown. Here we show that mice undergoing a 28-day course of tamoxifen treatment experience dysregulation of core and skin temperature, changes in bone density, and decreased physical activity, recapitulating several aspects of the human response. more...

Organism:

Mus musculus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL21103

16 Samples

Download data: MTX, TSV

(Submitter supplied) Resistance to tamoxifen in breast cancer patients is a serious therapeutic problem and major efforts are underway to understand underlying mechanisms. Resistance can be either intrinsic or acquired. We derived a series of subcloned MCF7 cell lines that were either highly sensitive or naturally resistant to tamoxifen and studied the factors that lead to drug resistance. Gene-expression studies revealed a signature of 67 genes that differentially respond to tamoxifen in sensitive vs. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Dataset:

GDS4051

Platform:

GPL570

24 Samples

Download data: CEL, EXP

Analysis of tamoxifen-sensitive and -resistant subclones of breast tumor MCF7 cells treated with estrogen (E), 4-hydroxy-tamoxifen (4-OHT), or E + 4-OHT. Success of 4-OHT therapy is limited by intrinsic and acquired drug resistance. Results provide insight into mechanisms leading to drug resistance.

Organism:

Homo sapiens

Type:

Expression profiling by array, count, 4 agent, 2 genotype/variation sets

Platform:

GPL570

Series:

GSE26459

24 Samples

Download data: CEL, EXP