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Dexamethasone treatment of VCaP prostate cells

ABSTRACT: The treatment of advanced prostate cancer has been transformed by novel antiandrogen therapies such as enzalutamide. We identified glucocorticoid receptor (GR) activity as modulator of enzalutamite sensitivity in the VCaP prostate cancer cell line. The GR agonist dexamethasone was sufficient to confer enzalutamide resistance whereas a GR antagonist restored sensitivity. These expression profiling data demonstrate that GR transcriptional activity overlaps with that of AR in the VCAP model. VCAP cells growing in complete media were treated with the indicated drugs in biological triplicates for 24 hours prior to harvest.

ORGANISM(S): Homo sapiens

SUBMITTER: Vivek Arora

PROVIDER: E-GEOD-51872 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Glucocorticoid receptor confers resistance to antiandrogens by bypassing androgen receptor blockade.

Arora Vivek K VK Schenkein Emily E Murali Rajmohan R Subudhi Sumit K SK Wongvipat John J Balbas Minna D MD Shah Neel N Cai Ling L Efstathiou Eleni E Logothetis Chris C Zheng Deyou D Sawyers Charles L CL

Cell 20131201 6

The treatment of advanced prostate cancer has been transformed by novel antiandrogen therapies such as enzalutamide. Here, we identify induction of glucocorticoid receptor (GR) expression as a common feature of drug-resistant tumors in a credentialed preclinical model, a finding also confirmed in patient samples. GR substituted for the androgen receptor (AR) to activate a similar but distinguishable set of target genes and was necessary for maintenance of the resistant phenotype. The GR agonist ...[more]

PMID: 24315100

Similar Datasets

Dexamethasone treatment of VCaP prostate cells

Project description:The treatment of advanced prostate cancer has been transformed by novel antiandrogen therapies such as enzalutamide. We identified glucocorticoid receptor (GR) activity as modulator of enzalutamite sensitivity in the VCaP prostate cancer cell line. The GR agonist dexamethasone was sufficient to confer enzalutamide resistance whereas a GR antagonist restored sensitivity. These expression profiling data demonstrate that GR transcriptional activity overlaps with that of AR in the VCAP model.

2013-12-27 | GSE51872 | GEO

Androgen and Glucocorticoid stimulation of LREX' cells in vitro

2013-12-27 | E-GEOD-51871 | biostudies-arrayexpress

LNCAP/AR and a LnCAP/AR subline (LREX') with acquired resistance to 2nd generation antiandrogens

Project description:The treatment of advanced prostate cancer has been transformed by novel antiandrogen therapies such as enzalutamide. Using the LnCaP/AR xenograft model, we identified induction of glucocorticoid receptor (GR) expression as a common feature of drug resistant tumors. From a resistant xenograft tumor, we derived a GR expressing resistant subline called LREX' which maintains the resistant phenotype. mRNA expression was used to characterize resistant tissues. LnCaP/AR cells were injected into castrate mice and tumors were established. Mice were then treated with vehicle (Con), 4 days of anti-androgen (ARN-509 10mgkg), or were maintained on anti-androgen (10mg/kg ARN-509 or enzalutamide) until emergence of resistance. Resistant tissues continued to be exposed to anti-androgen through time of harvest. LREX' (LnCaP/AR Resistant to Enzalutamide Xenograft Derived) was derived from an enzalutamide resistant xenograft and was re-injected into castrate mice undergoing continual treatment with enzalutamide. The GR probe on the Illumina array failed to detect GR expression. Therefore, GR expression as determined by qPCR is annotated separately. Of the 10 control tissues, 8 were analyzed twice (technical duplicates annotated as A and B).

2013-12-27 | E-GEOD-51873 | biostudies-arrayexpress

Transcriptome analysis of VCaP xenografts resistant to dual therapy with abiraterone and enzalutamide

Project description:We report RNA sequencing data on serial biopsies of prostate cancer VCaP xenografts as the tumors pass from androgen-sensitivity (Pre-Cx), to castration resistance (CRPC, castration resistant prostate cancer), onto resistance to dual therapy with abiraterone plus enzalutamide (AER). From comparison of these RNAseq data sets, we were able to determine differentially expressed genes between the AER/CRPC and Pre-Cx states that could mediate resistance to androgen deprivation therapies.

2018-12-26 | GSE109708 | GEO

RNA-seq analysis regarding antiandrogen (enzalutamide) effect on gene expression in castration-resistant prostate cancer (CRPC) xenograft model

Project description:VCaP prostate cancer xenografts grown in castrated mice were treated with antiandrogen (enzalutamide), and samples were obtained during treatment response (Enza I: 5 days after initiation of the treatment) and after the treatment resistance had occurred (Enza II: 47 days after initiation of the treatment).

2022-05-02 | GSE147541 | GEO

Regulation of the glucocorticoid receptor via a BET-dependent enhancer drives antiandrogen resistance in prostate cancer

Project description:In prostate cancer, resistance to the antiandrogen enzalutamide (Enz) can occur through bypass of androgen receptor (AR) blockade by the glucocorticoid receptor (GR). In contrast to fixed genomic alterations, here we show that GR-mediated antiandrogen resistance is adaptive and reversible due to regulation of GR expression by a tissue-specific enhancer. GR expression is silenced in prostate cancer by a combination of AR binding and EZH2-mediated repression at the GR locus, but is restored in advanced prostate cancers upon reversion of both repressive signals. Remarkably, BET bromodomain inhibition resensitizes drug-resistant tumors to Enz by selectively impairing the GR signaling axis via this enhancer. In addition to revealing an underlying molecular mechanism of GR-driven drug resistance, these data suggest that inhibitors of broadly active chromatin-readers could have utility in nuanced clinical contexts of acquired drug resistance with a more favorable therapeutic index.

2017-09-11 | GSE103449 | GEO

Androgen and Glucocorticoid stimulation of LREX' cells in vitro

2013-12-27 | GSE51871 | GEO

LNCAP/AR and a LnCAP/AR subline (LREX') with acquired resistance to 2nd generation antiandrogens

2013-12-27 | GSE51873 | GEO

Linking prostate cancer cell AR heterogeneity to distinct castration and Enzalutamide responses

Project description:Molecular mechanisms underlying resistance to androgen deprivation therapy (ADT) and, in particular, to antiandrogen Enzalutamide, in treating castration-resistant prostate cancer (CRPC), remain incompletely understood. Through screening >120 CRPC patient samples, we observed 3 expression patterns of androgen receptor (AR) protein: primarily nuclear (nuc-AR), mixed nuclear/cytoplasmic expression (nuc/cyto-AR), and low/no expression (AR-/lo). Xenograft CRPC modeling in 4 models (i.e., LNCaP, VCaP, LAPC4, and LAPC9) recapitulated the 3 AR expression patterns in castration-resistant tumors developed from parental androgen-dependent tumors. Strikingly, although the 3 CRPC models that retained AR expression (LNCaP, VCaP, and LAPC4) responded, to different levels and in different kinetics, to Enzalutamide, the AR-/lo LAPC9 CRPC was completely refractory to Enzalutamide. By combining whole-genome RNA-Seq and biochemical analyses together with experimental combinatorial therapy in the LNCaP and LAPC9 models, we identified BCL-2 as a critical therapeutic target in both AR+/hi and AR-/lo, Enzalutamide-resistant CRPC models.

2018-08-01 | GSE88752 | GEO

RNA sequencing analysis of VCaP cells resistant to abiraterone

Project description:Here, we analyze gene expression of prostate cancer cell line VCaP (VCaP WT) and VCaP after long time treatment with abiraterone (VCaP AA) in order to investigate possible resistance mechanisms to second-generation antiandrogens.

2024-06-30 | GSE196523 | GEO

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