Circadian adaptive signaling to critical ROS stress for cell survival
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
SUBMITTER: Guillaume Vares
PROVIDER: E-GEOD-47955 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Disruption of circadian clocks exacerbates various diseases, in part likely due to impaired stress resistance. It is unclear how nearly lethal stresses affect circadian clocks. We found that near-lethal doses of reactive oxygen species (ROS)-induced critical oxidative stress (cOS) at the branch point of life and death resets circadian clocks, synergistically evoking protective responses for cell survival. The cOS-triggered clock resetting and pro-survival responses are mediated by transcription factor, central clock-regulatory BMAL1 and heat shock stress-responsive (HSR) HSF1. Casein kinase II (CK2) –mediated phosphorylation regulates dimerization and function of BMAL1 and HSF1 to control the cOS-evoked responses. The core cOS-responsive transcriptome includes CK2-orchestrated crosstalk between the circadian, HSR, NFκB-mediated anti-apoptotic, and Nrf2-mediated anti-oxidant pathways. This novel circadian-adaptive signaling system likely plays fundamental protective roles in ROS-inducible disorders, various diseases, and death.
2013-11-09 | GSE47955 | GEO
Project description:Mammals rely on a network of circadian clocks to control daily systemic metabolism and physiology. The central pacemaker in the suprachiasmatic nucleus (SCN) is considered hierarchically dominant over peripheral clocks, whose degree of independence, or tissue-level autonomy, has never been ascertained in vivo. Using arrhythmic Bmal1-null mice, we generated animals with reconstituted circadian expression of BMAL1 exclusively in the liver (Liver-RE). High-throughput transcriptomics and metabolomics show that the liver has independent circadian functions specific for metabolic processes such as the NAD+ salvage pathway and glycogen turnover. However, although BMAL1 occupies chromatin at most genomic targets in Liver-RE mice, circadian expression is restricted to ∼10% of normally rhythmic transcripts. Finally, rhythmic clock gene expression is lost in Liver-RE mice under constant darkness. Hence, full circadian function in the liver depends on signals emanating from other clocks, and light contributes to tissue-autonomous clock function.
2019-06-13 | GSE132659 | GEO
Project description:The heat shock response (HSR) is a mechanism to cope with proteotoxic stress by inducing the expression of molecular chaperones and other heat shock response genes. The HSR is evolutionarily well conserved and has been widely studied in bacteria, cell lines and lower eukaryotic model organisms. However, mechanistic insights into the HSR in higher eukaryotes, in particular in mammals, are limited. We have developed an in vivo heat shock protocol to analyze the HSR in mice and dissected heat shock factor 1 (HSF1)-dependent and -independent pathways. Whilst the induction of proteostasis-related genes was dependent on HSF1, the regulation of circadian function related genes, indicating that the circadian clock oscillators have been reset, was independent of its presence. Furthermore, we demonstrate that the in vivo HSR is impaired in mouse models of Huntington’s disease but we were unable to corroborate the general repression of transcription after a heat shock found in lower eukaryotes.
2017-03-03 | GSE95602 | GEO
Project description:Peripheral circadian clocks regulate many aspects of physiology. In this study we deleted the core circadian clock component Bmal1 specifically in mouse adipocytes in order to study the role of the adipocyte clock in energy homeostasis and body weight. We used microarrays to indentify changes in gene expression in the adipose tissue of mice lacking a functional adipocyte circadian clock and identified a small number of up- and down- regulated genes. Adipose tissues were isolated from inguinal adipose fat pads at four different times of the diurnal cycle under constant darkness (circadian time, CT) for RNA extraction and hybridization on Affymetrix microarrays. Adipocyte-specific Bmal1 KO (Ad-Bmal1-/-) and control mice were used for isolation of tissues at CT0, CT6, CT12, CT18 where CT0 the beginning of the subjective day.
2012-10-21 | E-GEOD-35026 | biostudies-arrayexpress
Project description:In mammals, circadian clocks are strictly suppressed during early embryonic stages as well as pluripotent stem cells, by the lack of CLOCK/BMAL1 mediated circadian feedback loops. During ontogenesis, the innate circadian clocks emerge gradually at a late developmental stage, then, with which the circadian temporal order is invested in each cell level throughout a body. Meanwhile, in the early developmental stage, a segmented body plan is essential for an intact developmental process and somitogenesis is controlled by another cell-autonomous oscillator, the segmentation clock, in the posterior presomitic mesoderm (PSM). In the present study, focusing upon the interaction between circadian key components and the segmentation clock, we investigated the effect of the CLOCK/BMAL1 on the segmentation clock Hes7 oscillation, revealing that the expression of functional CLOCK/BMAL1 severely interferes with the ultradian rhythm of segmentation clock in induced PSM and gastruloids. RNA sequencing analysis showed that the premature expression of CLOCK/BMAL1 affects the Hes7 transcription and its regulatory pathways. These results suggest that the suppression of CLOCK/BMAL1-mediated transcriptional regulation during the somitogenesis may be inevitable for intact mammalian development.
2021-12-09 | GSE181295 | GEO
Project description:Organisms have adapted to the changing environmental conditions within the 24h cycle of the day by temporally segregating tissue physiology to the optimal time of the day. On the cellular level temporal segregation of physiological processes is established by the circadian clock, a Bmal1 dependent transcriptional oscillator network. The circadian clocks within individual cells of a tissue are synchronised by environmental signals, mainly light, in order to reach temporally segregated physiology on the tissue level. However, how light mediated synchronisation of peripheral tissue clocks is achieved mechanistically and whether circadian clocks in different organs are autonomous or interact with each other to achieve rhythmicity is unknown. Here we report that light can synchronise core circadian clocks in two peripheral tissues, the epidermis and liver hepatocytes, even in the complete absence of functional clocks in any other tissue within the whole organism. On the other hand, tissue extrinsic circadian clock rhythmicity is necessary to retain rhythmicity of the epidermal clock in the absence of light, proving for the first time that the circadian clockwork acts as a memory of time for the synchronisation of peripheral clocks in the absence of external entrainment signals. Furthermore, we find that tissue intrinsic Bmal1 is an important regulator of the epidermal differentiation process whose deregulation leads to a premature aging like phenotype of the epidermis. Thus, our results establish a new model for the segregation of peripheral tissue physiology whereby the synchronisation of peripheral clocks is acquired by the interaction of a light dependent but circadian clock independent pathway with circadian clockwork dependent cues.
2019-03-25 | GSE114943 | GEO
Project description:Organisms have adapted to the changing environmental conditions within the 24h cycle of the day by temporally segregating tissue physiology to the optimal time of the day. On the cellular level temporal segregation of physiological processes is established by the circadian clock, a Bmal1 dependent transcriptional oscillator network. The circadian clocks within individual cells of a tissue are synchronised by environmental signals, mainly light, in order to reach temporally segregated physiology on the tissue level. However, how light mediated synchronisation of peripheral tissue clocks is achieved mechanistically and whether circadian clocks in different organs are autonomous or interact with each other to achieve rhythmicity is unknown. Here we report that light can synchronise core circadian clocks in two peripheral tissues, the epidermis and liver hepatocytes, even in the complete absence of functional clocks in any other tissue within the whole organism. On the other hand, tissue extrinsic circadian clock rhythmicity is necessary to retain rhythmicity of the epidermal clock in the absence of light, proving for the first time that the circadian clockwork acts as a memory of time for the synchronisation of peripheral clocks in the absence of external entrainment signals. Furthermore, we find that tissue intrinsic Bmal1 is an important regulator of the epidermal differentiation process whose deregulation leads to a premature aging like phenotype of the epidermis. Thus, our results establish a new model for the segregation of peripheral tissue physiology whereby the synchronisation of peripheral clocks is acquired by the interaction of a light dependent but circadian clock independent pathway with circadian clockwork dependent cues.
2019-03-25 | GSE115104 | GEO
Project description:Background. The Heat Shock Response (HSR) is an evolutionarily conserved mechanism that helps cells adapt to environmental stresses. Heat Shock Factor 1 (HSF1) is a master HSR transcription factor that is long known to bind at promoters of its target HSP genes to rapidly activate their transcription. However, recent genome-wide studies revealed HSF1 binding at thousands of sites outside of heat-shock responsive gene promoters, implying a broader role of HSF1 in HSR. Results. We asked how the widespread HSF1 binding is established and to what extent it may be related to transcription activation. To answer these questions, we examined responses of two different human cancer cell lines to two stimuli that induce HSR, exposure to 42C and inorganic arsenic at the ambient temperature, by manually integrating ChIP-sequencing against HSF1, RNA Pol II, H3K4Me3 with nascent RNA- and ATAC-sequencing datasets in cells before and during HSR induced by these two stimuli. We show that widespread HSF1 binding is a temperature-agnostic hallmark of HSR whose genome-wide patterns combine cell type specificity with robustness to the nature of a stimulus and magnitude of activation. Mechanistically, HSR involves amplification of pre-existing low level HSF1 binding with few changes in accessible chromatin. HSF1 binding patterns show more stability than transcriptionally activated genes both between conditions and between cell lines. Conclusions. Comparing responses of distant cell lines to two HSR-inducing stimuli allowed us to define several features of HSR. Genome-wide HSF1 binding is a sensitive readout of HSR whose genome-wide patterns retain cell type identity across a broad dynamic range. The pre-existing genomic architecture is retained during HSR down to individual loci. Context-specific transcription involving common HSF1 binding favors a model of regulation by combinatory interplay of rigid transcription factor patterns.
2023-10-30 | GSE209685 | GEO
Project description:Background. The Heat Shock Response (HSR) is an evolutionarily conserved mechanism that helps cells adapt to environmental stresses. Heat Shock Factor 1 (HSF1) is a master HSR transcription factor that is long known to bind at promoters of its target HSP genes to rapidly activate their transcription. However, recent genome-wide studies revealed HSF1 binding at thousands of sites outside of heat-shock responsive gene promoters, implying a broader role of HSF1 in HSR. Results. We asked how the widespread HSF1 binding is established and to what extent it may be related to transcription activation. To answer these questions, we examined responses of two different human cancer cell lines to two stimuli that induce HSR, exposure to 42C and inorganic arsenic at the ambient temperature, by manually integrating ChIP-sequencing against HSF1, RNA Pol II, H3K4Me3 with nascent RNA- and ATAC-sequencing datasets in cells before and during HSR induced by these two stimuli. We show that widespread HSF1 binding is a temperature-agnostic hallmark of HSR whose genome-wide patterns combine cell type specificity with robustness to the nature of a stimulus and magnitude of activation. Mechanistically, HSR involves amplification of pre-existing low level HSF1 binding with few changes in accessible chromatin. HSF1 binding patterns show more stability than transcriptionally activated genes both between conditions and between cell lines. Conclusions. Comparing responses of distant cell lines to two HSR-inducing stimuli allowed us to define several features of HSR. Genome-wide HSF1 binding is a sensitive readout of HSR whose genome-wide patterns retain cell type identity across a broad dynamic range. The pre-existing genomic architecture is retained during HSR down to individual loci. Context-specific transcription involving common HSF1 binding favors a model of regulation by combinatory interplay of rigid transcription factor patterns.
2023-10-30 | GSE209675 | GEO
Project description:Background. The Heat Shock Response (HSR) is an evolutionarily conserved mechanism that helps cells adapt to environmental stresses. Heat Shock Factor 1 (HSF1) is a master HSR transcription factor that is long known to bind at promoters of its target HSP genes to rapidly activate their transcription. However, recent genome-wide studies revealed HSF1 binding at thousands of sites outside of heat-shock responsive gene promoters, implying a broader role of HSF1 in HSR. Results. We asked how the widespread HSF1 binding is established and to what extent it may be related to transcription activation. To answer these questions, we examined responses of two different human cancer cell lines to two stimuli that induce HSR, exposure to 42C and inorganic arsenic at the ambient temperature, by manually integrating ChIP-sequencing against HSF1, RNA Pol II, H3K4Me3 with nascent RNA- and ATAC-sequencing datasets in cells before and during HSR induced by these two stimuli. We show that widespread HSF1 binding is a temperature-agnostic hallmark of HSR whose genome-wide patterns combine cell type specificity with robustness to the nature of a stimulus and magnitude of activation. Mechanistically, HSR involves amplification of pre-existing low level HSF1 binding with few changes in accessible chromatin. HSF1 binding patterns show more stability than transcriptionally activated genes both between conditions and between cell lines. Conclusions. Comparing responses of distant cell lines to two HSR-inducing stimuli allowed us to define several features of HSR. Genome-wide HSF1 binding is a sensitive readout of HSR whose genome-wide patterns retain cell type identity across a broad dynamic range. The pre-existing genomic architecture is retained during HSR down to individual loci. Context-specific transcription involving common HSF1 binding favors a model of regulation by combinatory interplay of rigid transcription factor patterns.
2023-10-30 | GSE209667 | GEO