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HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers

ABSTRACT: This SuperSeries is composed of the following subset Series: GSE38232: HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [gene expression] GSE38901: HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [ChIP-Seq] Refer to individual Series

ORGANISM(S): Homo sapiens

SUBMITTER: Mendillo ML

PROVIDER: S-ECPF-GEOD-38912 | biostudies-other | 2012 Aug

REPOSITORIES: biostudies-other

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HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers.

Project description:Heat-Shock Factor 1 (HSF1), master regulator of the heat-shock response, facilitates malignant transformation, cancer cell survival, and proliferation in model systems. The common assumption is that these effects are mediated through regulation of heat-shock protein (HSP) expression. However, the transcriptional network that HSF1 coordinates directly in malignancy and its relationship to the heat-shock response have never been defined. By comparing cells with high and low malignant potential alongside their nontransformed counterparts, we identify an HSF1-regulated transcriptional program specific to highly malignant cells and distinct from heat shock. Cancer-specific genes in this program support oncogenic processes: cell-cycle regulation, signaling, metabolism, adhesion and translation. HSP genes are integral to this program, however, many are uniquely regulated in malignancy. This HSF1 cancer program is active in breast, colon and lung tumors isolated directly from human patients and is strongly associated with metastasis and death. Thus, HSF1 rewires the transcriptome in tumorigenesis, with prognostic and therapeutic implications.

| S-EPMC3438889 | biostudies-literature

HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers

Project description:This SuperSeries is composed of the following subset Series: GSE38232: HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [gene expression] GSE38901: HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [ChIP-Seq] Refer to individual Series

2012-08-06 | E-GEOD-38912 | biostudies-arrayexpress

HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers

Project description:This SuperSeries is composed of the SubSeries listed below.

2012-08-07 | GSE38912 | GEO

HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [gene expression]

Project description:Heat-Shock Factor 1 (HSF1), master regulator of the heat-shock response, facilitates malignant transformation, cancer cell survival and proliferation in model systems. The common assumption is that these effects are mediated through regulation of heat-shock protein (HSP) expression. However, the transcriptional network that HSF1 coordinates directly in malignancy and its relationship to the heat-shock response have never been defined. By comparing cells with high and low malignant potential alongside their non-transformed counterparts, we identify an HSF1-regulated transcriptional program specific to highly malignant cells and distinct from heat shock. Cancer-specific genes in this program support oncogenic processes: cell-cycle regulation, signaling, metabolism, adhesion and translation. HSP genes are integral to this program, however, even these genes are uniquely regulated in malignancy. This HSF1 cancer program is active in breast, colon and lung tumors isolated directly from human patients and is strongly associated with metastasis and death. Thus, HSF1 rewires the transcriptome in tumorigenesis, with prognostic and therapeutic implications. We used microarrays to examine affect of HSF1 depletion on gene expression in cancer cell lines. Three cancer cell lines (BPLER, HMLER & MCF7) were transduced with either control shRNAi (Scramble or GFP) or an shRNAi that targets and depletes HSF1 (hA6). Another BPLER sample was subjected to a 1H, 42M-KM-^Z C heat shock. Two biological replicates for all samples.

2012-08-06 | E-GEOD-38232 | biostudies-arrayexpress

HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [ChIP-Seq]

2012-08-07 | E-GEOD-38901 | biostudies-arrayexpress

HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [ChIP-Seq]

2012-08-07 | GSE38901 | GEO

HSF1 drives a transcriptional program distinct from heat shock to support highly malignant human cancers [gene expression]

2012-08-07 | GSE38232 | GEO

HSF1 Mouse Fibroblast Heat Shock - Scanner7

Project description:Mouse HSF1+/+ and HSF1-/- Fibroblasts Heat Shock Time Courses Scanned on Scanner 7 (Axon 4000B) Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Keywords: Logical Set

2005-08-05 | GSE3074 | GEO

Transcriptional regulation of small heat shock protein genes by heat shock factor 1 (HSF1) in Liriomyza trifolii under heat stress.

Project description:Small heat shock proteins (sHSPs) function as molecular chaperones in multiple physiological processes and are active during thermal stress. sHSP expression is controlled by heat shock transcription factor (HSF); however, few studies have been conducted on HSF in agricultural pests. Liriomyza trifolii is an introduced insect pest of horticultural and vegetable crops in China. In this study, the master regulator, HSF1, was cloned and characterized from L. trifolii, and the expression levels of HSF1 and five sHSPs were studied during heat stress. HSF1 expression in L. trifolii generally decreased with rising temperatures, whereas expression of the five sHSPs showed an increasing trend that correlated with elevated temperatures. All five sHSPs and HSF1 showed an upward trend in expression with exposure to 40 ℃ without a recovery period. When a recovery period was incorporated after thermal stress, the expression patterns of HSF1 and sHSPs in L. trifolii exposed to 40 °C was significantly lower than expression with no recovery period. To elucidate potential interactions between HSF1 and sHSPs, double-stranded RNA was synthesized to knock down HSF1 in L. trifolii by RNA interference. The knockdown of HSF1 by RNAi decreased the survival rate and expression of HSP19.5, HSP20.8, and HSP21.3 during high-temperature stress. This study expands our understanding of HSF1-regulated gene expression in L. trifolii exposed to heat stress.

| S-EPMC8492843 | biostudies-literature

Heat shock factor 1 (HSF1) specifically potentiates c-MYC-mediated transcription independently of the canonical heat shock response.

Project description:Despite its pivotal roles in biology, how the transcriptional activity of c-MYC is tuned quantitatively remains poorly defined. Here, we show that heat shock factor 1 (HSF1), the master transcriptional regulator of the heat shock response, acts as a prime modifier of the c-MYC-mediated transcription. HSF1 deficiency diminishes c-MYC DNA binding and dampens its transcriptional activity genome wide. Mechanistically, c-MYC, MAX, and HSF1 assemble into a transcription factor complex on genomic DNAs, and surprisingly, the DNA binding of HSF1 is dispensable. Instead, HSF1 physically recruits the histone acetyltransferase general control nonderepressible 5 (GCN5), promoting histone acetylation and augmenting c-MYC transcriptional activity. Thus, we find that HSF1 specifically potentiates the c-MYC-mediated transcription, discrete from its canonical role in countering proteotoxic stress. Importantly, this mechanism of action engenders two distinct c-MYC activation states, primary and advanced, which may be important to accommodate diverse physiological and pathological conditions.

| S-EPMC10592515 | biostudies-literature

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