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Genome-wide HSF1 binding sites in control and heat shocked spermatocytes and hepatocytes

ABSTRACT: In somatic cells elevated temperature induces activation of the heat shock transcription factor 1 (HSF1) what leads to heat shock proteins synthesis and cytoprotection. However, in the male germ cells (spermatocytes) upon HSF1 activation, caspase-3 dependent apoptosis is induced and spermatogenic cells are actively eliminated. To find out molecular targets of HSF1 in all promoter regions, and to elucidate a mechanism of such diverse HSF1 activity we carried out genome-wide HSF1 binding analysis in control and heat-shocked cells, either spermatogenic or somatic. As model somatic cells we used hepatocytes that respond to hyperthermia in a classical way by induction of heat shock genes transcription. As spermatogenic cells we used a fraction of cells enriched with spermatocytes, which are the most sensitive to damage in elevated temperatures. Using isolated spermatocytes we avoided the influence of the somatic testicular component on the our final results. On Affymetrix GeneChipM-BM-. Mouse Promoter 1.0R Arrays we analyzed DNA immunoprecipitated (using anty-HSF1 antibody) from spermatocytes or hepatocytes, either untreated (control) or immediately after heat shock performed in vitro for 5-20 minutes. ChIP on chip analyses were done in triplicate.

ORGANISM(S): Mus musculus

SUBMITTER: Joanna Polanska

PROVIDER: E-GEOD-40390 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Expression data from control and heat shocked mouse spermatocytes and hepatocytes

Project description:In somatic cells elevated temperature induces activation of the heat shock transcription factor 1 (HSF1) what leads to heat shock proteins synthesis and cytoprotection. However, in the male germ cells (spermatocytes) upon HSF1 activation, caspase-3 dependent apoptosis is induced and spermatogenic cells are actively eliminated. To elucidate a mechanism of such diverse HSF1 activity we carried out genome-wide transcriptional analysis in control and heat-shocked cells, either spermatogenic or somatic. As model somatic cells we used hepatocytes that respond to hyperthermia in a classical way by induction of heat shock genes transcription. As spermatogenic cells we used a fraction of cells enriched with spermatocytes, which are the most sensitive to damage in elevated temperatures. Using isolated spermatocytes we avoided the influence of the somatic testicular component on the our final results. Genes that are differently regulated during hyperthermia in both types of cells have been identified. On Affymetrix gene chip arrays we analyzed RNA isolated from spermatocytes or hepatocytes, either untreated (control) or after heat shock and 2h of recovery at physiological temperature. Analyses were done in triplicate.

2012-08-22 | E-GEOD-40248 | biostudies-arrayexpress

HSF1 and HSF2 interactions with chromatin during the heat shock response in mouse spermatocytes

Project description:Heat shock transcription factors HSF1 and HSF2 both are necessary for proper spermatogenesis, which is disrupted at elevated temperatures. We studied how HSF1 and HSF2 cooperate during the heat shock response in mouse spermatocytes. For this purpose we used ChIP-sequencing. ChIP-Seq analyses revealed that the temperature elevation induces remodeling of HSF1 and HSF2 binding to chromatin. The highest HSF1-chromatin binding was observed at 43M-BM-0C, when HSF2-chromatin binding was reduced. Many promoters (mainly Hsp genes) were occupied by both heat shock factors at physiological temperature of testes and/or at 38M-BM-0C. In contrary at 43M-BM-0C only HSF1 was bound. Obtained results suggest that HSF1 and HSF2 could cooperate in regulation of the transcription of some genes only at physiological temperatures and/or at 38M-BM-0C. Alteration in HSFs interactions and their binding to chromatin could be one of the reason of increased spermatogenic cell death observed after heat shock. On Illumina platform we sequenced DNA immunoprecipitated from isolated spermatocytes using anti-HSF1 antibody or anti-HSF2 antibody. Cells were either untreated (control) or heat shocked for 5-20 minutes. Two PCR-verified ChIP replicates were collected per each sample, and three negative control samples with normal goat serum were included.

2014-10-07 | E-GEOD-56735 | biostudies-arrayexpress

Genome-wide HSF1 binding sites in control and heat shocked spermatocytes and hepatocytes

Project description:In somatic cells elevated temperature induces activation of the heat shock transcription factor 1 (HSF1) what leads to heat shock proteins synthesis and cytoprotection. However, in the male germ cells (spermatocytes) upon HSF1 activation, caspase-3 dependent apoptosis is induced and spermatogenic cells are actively eliminated. To find out molecular targets of HSF1 in all promoter regions, and to elucidate a mechanism of such diverse HSF1 activity we carried out genome-wide HSF1 binding analysis in control and heat-shocked cells, either spermatogenic or somatic. As model somatic cells we used hepatocytes that respond to hyperthermia in a classical way by induction of heat shock genes transcription. As spermatogenic cells we used a fraction of cells enriched with spermatocytes, which are the most sensitive to damage in elevated temperatures. Using isolated spermatocytes we avoided the influence of the somatic testicular component on the our final results.

2012-08-28 | GSE40390 | GEO

Expression data from control and heat shocked mouse spermatocytes and hepatocytes

2012-08-22 | GSE40248 | GEO

Transriptional profiling upon heat shock and recovery in cells deficient for FBXW7 and their wild type counterpart.

Project description:FBXW7 modulates stress response by post-translational modification of HSF1 HSF1 orchestrates the heat-shock response upon exposure to heat stress and activates a transcriptional program vital for cancer cells. Genes positively regulated by HSF1 show increeased expression during heat shock while their expression is reduced during recovery. Genes negatively regulated by HSF1 show the opposite pattern. In this study we utilized the HCT116 FBXW7 KO colon cell line and its wild type counterpart to monitor gene expression changes during heat shock (42oC, 1 hour) and recovery (37oC for 2 hours post heat shock) using RNA sequencing. These results revealed that the heat-shock response pathway is prolonged in cells deficient for FBXW7. Whole RNA was extracted from 1 million HCT116 WT or FBXW7KO cells using the RNAeasy kit (Qiagen) according to the manufacturer’s protocol. Poly-A+ (magnetic oligodT-containing beads (Invitrogen)) or Ribominus RNA was used for library preparation. cDNA preparation and strand-specific library construction was performed using the dUTP method. Libraries were sequenced on the Illumina HiSeq 2000 using 50bp single-read method. Differential gene expression analysis was performed for each matched recovery versus heat-shock pairs, separately in each biological replicate and cell line (WT or KO). Two types of comparisons were tested: (a) WT recovery vs WT heat shock, (b) FBXW7 KO recovery vs heat shock.

2015-02-20 | E-GEOD-57397 | biostudies-arrayexpress

HSF1 and HSF2 interactions with chromatin during the heat shock response in mouse spermatocytes

Project description:Heat shock transcription factors HSF1 and HSF2 both are necessary for proper spermatogenesis, which is disrupted at elevated temperatures. We studied how HSF1 and HSF2 cooperate during the heat shock response in mouse spermatocytes. For this purpose we used ChIP-sequencing. ChIP-Seq analyses revealed that the temperature elevation induces remodeling of HSF1 and HSF2 binding to chromatin. The highest HSF1-chromatin binding was observed at 43°C, when HSF2-chromatin binding was reduced. Many promoters (mainly Hsp genes) were occupied by both heat shock factors at physiological temperature of testes and/or at 38°C. In contrary at 43°C only HSF1 was bound. Obtained results suggest that HSF1 and HSF2 could cooperate in regulation of the transcription of some genes only at physiological temperatures and/or at 38°C. Alteration in HSFs interactions and their binding to chromatin could be one of the reason of increased spermatogenic cell death observed after heat shock.

2014-10-07 | GSE56735 | GEO

Expression data from 15-day-old mouse testes

Project description:Activation of the Heat Shock Factor 1 (HSF1) in spermatogenic cells leads to apoptosis and infertility of males. To elucidate a mechanisms of apoptosis induced by HSF1 we generated transgenic mice expressing mutated, constitutively active human HSF1 (with a deletion of amino acids 221–315) specifically in spermatocytes (under control of the rat Hspa2 promoter). We carried out genome-wide transcriptional analyses in testes of control, wild-type, and transgenic males. Genes that changed the expression due to activation of HSF1 have been identified.

2019-03-29 | GSE128996 | GEO

Polyglutamine expanded huntingtin dramatically alters the genome-wide binding of HSF1 (mRNA)

Project description:In Huntington's disease (HD), polyglutamine expansions in the huntingtin (Htt) protein cause subtle changes in cellular functions that, over-time, lead to neurodegeneration and death. Studies have indicated that activation of the heat shock response can reduce many of the effects of mutant Htt in disease models, suggesting that the heat shock response is impaired in the disease. To understand the basis for this impairment, we have used genome-wide chromatin immunoprecipitation followed by massively parallel sequencing (ChIP-Seq) to examine the effects of mutant Htt on the master regulator of the heat shock response, HSF1. We find that, under normal conditions, HSF1 function is highly similar in cells carrying either wild-type or mutant Htt. However, polyQ-expanded Htt severely blunts the HSF1-mediated stress response. Surprisingly, we find that the HSF1 targets most affected upon stress are not directly associated with proteostasis, but with cytoskeletal binding, focal adhesion and GTPase activity. Our data raise the intriguing hypothesis that the accumulated damage from life-long impairment in these stress responses may contribute significantly to the etiology of Huntington's disease. Affymetrix MG430 2.0 expression levels of wild-type (STHdhQ7/Q7) and mutant (STHdhQ111/Q111) striatal cells under growth condition (33 C) and upon heat shock (42 C for six hours)

2012-06-18 | E-GEOD-38001 | biostudies-arrayexpress

Polyglutamine expanded huntingtin dramatically alters the genome-wide binding of HSF1 (ChIP-Seq)

Project description:In HuntingtonM-bM-^@M-^Ys disease (HD), polyglutamine expansions in the huntingtin (Htt) protein cause subtle changes in cellular functions that, over-time, lead to neurodegeneration and death. Studies have indicated that activation of the heat shock response can reduce many of the effects of mutant Htt in disease models, suggesting that the heat shock response is impaired in the disease. To understand the basis for this impairment, we have used genome-wide chromatin immunoprecipitation followed by massively parallel sequencing (ChIP-Seq) to examine the effects of mutant Htt on the master regulator of the heat shock response, HSF1. We find that, under normal conditions, HSF1 function is highly similar in cells carrying either wild-type or mutant Htt. However, polyQ-expanded Htt severely blunts the HSF1-mediated stress response. Surprisingly, we find that the HSF1 targets most affected upon stress are not directly associated with proteostasis, but with cytoskeletal binding, focal adhesion and GTPase activity. Our data raise the intriguing hypothesis that the accumulated damage from life-long impairment in these stress responses may contribute significantly to the etiology of Huntington's disease. ChIP-Seq experiments for HSF-1 were performed in striatal cells that express either wild-type or mutant Htt using ChIP-Seq technology under normal (33M-BM-0C) and heat shock (42M-BM-0C for six hours) conditions. The cells were crosslinked with 1% formaldehyde and immunoprecipitated using antibody sc-9144 (Santa Cruz Biotech) for HSF-1. Sequencing was performed using the Illumina Genome Analyzer II.

2012-06-19 | E-GEOD-38000 | biostudies-arrayexpress

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

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. ChIP-seq was used to characterize HSF1 binding

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

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