Expression data from primary mouse hepatocytes treated with Diclofenac
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE54256 | GEO | 2014/01/22
SECONDARY ACCESSION(S): PRJNA236047
REPOSITORIES: GEO
Similar Datasets
Project description:Drug-induced liver injury (DILI) is an important clinical problem. Here we used a genomics approach to establish the critical drug-induced toxicity pathways that act in synergy with the pro-inflammatory cytokine tumor necrosis factor (TNF) to cause cell death of liver HepG2 cells. Transcriptomics of the cell injury stress response pathways initiated by two hepatoxicants, diclofenac and carbamazepine, revealed the endoplasmic reticulum (ER) stress/translational initiation signaling and Nrf2 antioxidant signaling as two major affected pathways, which was similar to that observed for the majority of ~80 DILI compounds in primary human hepatocytes. The ER stress was primarily related to PERK and ATF4 activation and subsequent expression of CHOP, which was all independent of TNFα signaling. Identical ATF4 dependent transcriptional programs were observed in primary human hepatocytes as well as primary precision cut human liver slices. Targeted RNA interference studies revealed that while ER stress signaling through IRE1α and ATF6 acted cytoprotective, activation of the ER stress protein kinase PERK and subsequent expression of CHOP was pivotal for the onset of drug/TNF-induced apoptosis. While inhibition of the Nrf2-dependent adaptive oxidative stress response enhanced the drug/TNF cytotoxicity, Nrf2 signaling did not affect CHOP expression. Both hepatotoxic drugs enhanced expression of the translational initiation factor EIF4A1, which was essential for CHOP expression and drug/TNF-mediated cell killing. Our data support a model in which enhanced drug-induced translation initiates PERK-mediated CHOP signaling in an EIF4A1 dependent manner, thereby sensitizing towards caspase-8-dependent TNF induced apoptosis. We sought to determine the effect of co-exposure of certain drugs associated with idiosyncratic DILI with the cytokine TNFalpha to mimic drug exposure with inflammation signaling in HepG2 cells Human hepatoma HepG2 cells were obtained from American Type Culture Collection (ATCC, Wesel, Germany), cultured in DMEM supplemented with 10% (v/v) FBS, 25 U/mL penicillin and 25 µg/mL streptomycin and used for experiments between passage 5 and 20.
2014-01-22 | E-GEOD-54254 | biostudies-arrayexpress
Project description:Drug-induced liver injury (DILI) is an important clinical problem. Here we used a genomics approach to establish the critical drug-induced toxicity pathways that act in synergy with the pro-inflammatory cytokine tumor necrosis factor M-oM-^AM-! (TNFM-oM-^AM-!) to cause cell death of liver HepG2 cells. Transcriptomics of the cell injury stress response pathways initiated by two hepatoxicants, diclofenac and carbamazepine, revealed the endoplasmic reticulum (ER) stress/translational initiation signaling and Nrf2 antioxidant signaling as two major affected pathways, which was similar to that observed for the majority of ~80 DILI compounds in primary human hepatocytes. The ER stress was primarily related to PERK and ATF4 activation and subsequent expression of CHOP, which was all independent of TNFM-NM-1 signaling. Identical ATF4 dependent transcriptional programs were observed in primary human hepatocytes as well as primary precision cut human liver slices. Targeted RNA interference studies revealed that while ER stress signaling through IRE1M-NM-1 and ATF6 acted cytoprotective, activation of the ER stress protein kinase PERK and subsequent expression of CHOP was pivotal for the onset of drug/TNF-induced apoptosis. While inhibition of the Nrf2-dependent adaptive oxidative stress response enhanced the drug/TNF cytotoxicity, Nrf2 signaling did not affect CHOP expression. Both hepatotoxic drugs enhanced expression of the translational initiation factor EIF4A1, which was essential for CHOP expression and drug/TNFM-oM-^AM-!-mediated cell killing. Our data support a model in which enhanced drug-induced translation initiates PERK-mediated CHOP signaling in an EIF4A1 dependent manner, thereby sensitizing towards caspase-8-dependent TNF induced apoptosis. 4 biological replicates of Diclofenac and 6 biological replicates of vehicle. 46 hours after isolation, cells were exposed to either 300 M-BM-5M DCF or the solvent DMSO for 24 hours.
2014-01-22 | E-GEOD-54256 | biostudies-arrayexpress
Project description:Drug-induced liver injury (DILI) is an important clinical problem. Here we used a genomics approach to establish the critical drug-induced toxicity pathways that act in synergy with the pro-inflammatory cytokine tumor necrosis factor (TNF) to cause cell death of liver HepG2 cells. Transcriptomics of the cell injury stress response pathways initiated by two hepatoxicants, diclofenac and carbamazepine, revealed the endoplasmic reticulum (ER) stress/translational initiation signaling and Nrf2 antioxidant signaling as two major affected pathways, which was similar to that observed for the majority of ~80 DILI compounds in primary human hepatocytes. The ER stress was primarily related to PERK and ATF4 activation and subsequent expression of CHOP, which was all independent of TNFM-NM-1 signaling. Identical ATF4 dependent transcriptional programs were observed in primary human hepatocytes as well as primary precision cut human liver slices. Targeted RNA interference studies revealed that while ER stress signaling through IRE1M-NM-1 and ATF6 acted cytoprotective, activation of the ER stress protein kinase PERK and subsequent expression of CHOP was pivotal for the onset of drug/TNF-induced apoptosis. While inhibition of the Nrf2-dependent adaptive oxidative stress response enhanced the drug/TNF cytotoxicity, Nrf2 signaling did not affect CHOP expression. Both hepatotoxic drugs enhanced expression of the translational initiation factor EIF4A1, which was essential for CHOP expression and drug/TNF-mediated cell killing. Our data support a model in which enhanced drug-induced translation initiates PERK-mediated CHOP signaling in an EIF4A1 dependent manner, thereby sensitizing towards caspase-8-dependent TNF induced apoptosis. Liver slices (diameter 4 mm, thickness 250 M-BM-5m) were pre-incubated at 37M-BM-0C for 1h individually in a well containing 1.3 ml WilliamsM-bM-^@M-^Y medium E with glutamax-1 (Gibco, Paisley, UK), supplemented with 25 mM D-glucose and 50 M-BM-5g/ml gentamicin (Gibco, Paisley, UK) (WEGG medium) in a 12-well plate with shaking (90 times/min) under saturated carbogen atmosphere.
2014-01-22 | E-GEOD-54255 | biostudies-arrayexpress
Project description:Drug-induced liver injury (DILI) is an important clinical problem. Here we used a genomics approach to establish the critical drug-induced toxicity pathways that act in synergy with the pro-inflammatory cytokine tumor necrosis factor (TNF) to cause cell death of liver HepG2 cells. Transcriptomics of the cell injury stress response pathways initiated by two hepatoxicants, diclofenac and carbamazepine, revealed the endoplasmic reticulum (ER) stress/translational initiation signaling and Nrf2 antioxidant signaling as two major affected pathways, which was similar to that observed for the majority of ~80 DILI compounds in primary human hepatocytes. The ER stress was primarily related to PERK and ATF4 activation and subsequent expression of CHOP, which was all independent of TNFα signaling. Identical ATF4 dependent transcriptional programs were observed in primary human hepatocytes as well as primary precision cut human liver slices. Targeted RNA interference studies revealed that while ER stress signaling through IRE1α and ATF6 acted cytoprotective, activation of the ER stress protein kinase PERK and subsequent expression of CHOP was pivotal for the onset of drug/TNF-induced apoptosis. While inhibition of the Nrf2-dependent adaptive oxidative stress response enhanced the drug/TNF cytotoxicity, Nrf2 signaling did not affect CHOP expression. Both hepatotoxic drugs enhanced expression of the translational initiation factor EIF4A1, which was essential for CHOP expression and drug/TNF-mediated cell killing. Our data support a model in which enhanced drug-induced translation initiates PERK-mediated CHOP signaling in an EIF4A1 dependent manner, thereby sensitizing towards caspase-8-dependent TNF induced apoptosis.
2014-01-22 | GSE54255 | GEO
Project description:Drug-induced liver injury (DILI) is an important clinical problem. Here we used a genomics approach to establish the critical drug-induced toxicity pathways that act in synergy with the pro-inflammatory cytokine tumor necrosis factor (TNF) to cause cell death of liver HepG2 cells. Transcriptomics of the cell injury stress response pathways initiated by two hepatoxicants, diclofenac and carbamazepine, revealed the endoplasmic reticulum (ER) stress/translational initiation signaling and Nrf2 antioxidant signaling as two major affected pathways, which was similar to that observed for the majority of ~80 DILI compounds in primary human hepatocytes. The ER stress was primarily related to PERK and ATF4 activation and subsequent expression of CHOP, which was all independent of TNFα signaling. Identical ATF4 dependent transcriptional programs were observed in primary human hepatocytes as well as primary precision cut human liver slices. Targeted RNA interference studies revealed that while ER stress signaling through IRE1α and ATF6 acted cytoprotective, activation of the ER stress protein kinase PERK and subsequent expression of CHOP was pivotal for the onset of drug/TNF-induced apoptosis. While inhibition of the Nrf2-dependent adaptive oxidative stress response enhanced the drug/TNF cytotoxicity, Nrf2 signaling did not affect CHOP expression. Both hepatotoxic drugs enhanced expression of the translational initiation factor EIF4A1, which was essential for CHOP expression and drug/TNF-mediated cell killing. Our data support a model in which enhanced drug-induced translation initiates PERK-mediated CHOP signaling in an EIF4A1 dependent manner, thereby sensitizing towards caspase-8-dependent TNF induced apoptosis. We sought to determine the effect of co-exposure of certain drugs associated with idiosyncratic DILI with the cytokine TNFalpha to mimic drug exposure with inflammation signaling in HepG2 cells
2014-01-22 | GSE54254 | GEO
Project description:Malignant carcinomas that recur following therapy are typically de-differentiated and multi-drug resistant (MDR). De-differentiated cancer cells acquire MDR by upregulating reactive oxygen species (ROS)-scavenging enzymes and drug efflux pumps, but how these genes are upregulated in response to de-differentiation is not known. Here, we examine this question by using global transcriptional profiling to identify ROS-induced genes that are already upregulated in de-differentiated cells, even in the absence of oxidative damage. Using this approach, we found that the Nrf2 transcription factor, which is the master regulator of cellular response to oxidative stress, is pre-activated in de-differentiated cells. In de-differentiated cells, Nrf2 is not activated by oxidation but rather through a non-canonical mechanism involving its phosphorylation by the ER membrane kinase PERK. In contrast, differentiated cells require oxidative damage to activate Nrf2. Constitutive PERK-Nrf2 signaling protects de-differentiated cells from chemotherapy by reducing ROS levels and increasing drug efflux. These findings are validated in therapy-resistant basal breast cancer cell lines and animal models, where inhibition of the PERK-Nrf2 signaling axis reversed the MDR of de-differentiated cancer cells. Additionally, analysis of patient tumor datasets showed that a PERK pathway signature correlates strongly with chemotherapy resistance, tumor grade, and overall survival. Collectively, these results indicate that de-differentiated cells upregulate MDR genes via PERK-Nrf2 signaling, and suggest that targeting this pathway could sensitize drug-resistant cells to chemotherapy. Differentiated human breast epithelial cells (HMLE-shGFP) or de-differentiated cells (HMLE-Twist) were treated in culture with 40uM menadione for 2 hours or 1uM PERK inhibitor for 48 hours and compared to control DMSO-treated cells.
2014-10-01 | E-GEOD-59780 | biostudies-arrayexpress
Project description:Malignant carcinomas that recur following therapy are typically de-differentiated and multi-drug resistant (MDR). De-differentiated cancer cells acquire MDR by upregulating reactive oxygen species (ROS)-scavenging enzymes and drug efflux pumps, but how these genes are upregulated in response to de-differentiation is not known. Here, we examine this question by using global transcriptional profiling to identify ROS-induced genes that are already upregulated in de-differentiated cells, even in the absence of oxidative damage. Using this approach, we found that the Nrf2 transcription factor, which is the master regulator of cellular response to oxidative stress, is pre-activated in de-differentiated cells. In de-differentiated cells, Nrf2 is not activated by oxidation but rather through a non-canonical mechanism involving its phosphorylation by the ER membrane kinase PERK. In contrast, differentiated cells require oxidative damage to activate Nrf2. Constitutive PERK-Nrf2 signaling protects de-differentiated cells from chemotherapy by reducing ROS levels and increasing drug efflux. These findings are validated in therapy-resistant basal breast cancer cell lines and animal models, where inhibition of the PERK-Nrf2 signaling axis reversed the MDR of de-differentiated cancer cells. Additionally, analysis of patient tumor datasets showed that a PERK pathway signature correlates strongly with chemotherapy resistance, tumor grade, and overall survival. Collectively, these results indicate that de-differentiated cells upregulate MDR genes via PERK-Nrf2 signaling, and suggest that targeting this pathway could sensitize drug-resistant cells to chemotherapy.
2014-10-01 | GSE59780 | GEO
Project description:we demonstrate that the WEE1 inhibitor AZD1775 triggers endoplasmic reticulum (ER) stress and activates the PERK and IRE1α branches of the unfolded protein response (UPR) in TP53 mutant HGSOC cells. Upon AZD1775 treatment, PERK facilitates apoptotic signaling in these cells via activating CHOP, whereas IRE1α-induced spliced XBP1 (XBP1s) confers survival in response to WEE1 inhibition. Our data uncover an important dual role of UPR in TP53 mutant HGSOC cells in response to AZD1775, where additional inhibition of IRE1α-XBP1s signaling may offer synergistic efficacy.
2021-02-10 | GSE166417 | GEO
Project description:Endoplasmic reticulum (ER) stress triggers an adaptive response which fosters tumor cell survival and resilience to stress conditions. Activation of the endoplasmic reticulum stress response, through its PERK branch, promotes the phosphorylation of the α-subunit of translation initiation factor eIF2alpha, thereby repressing general protein translation and selectively augmenting the translation of ATF4 with the downstream CHOP transcription factor and the protein disulfide oxidase ERO1. Here, we show that ISRIB, a small molecule, which inhibits the action of the phosphorylated α-subunit of eIF2, thereby activating protein translation, synergistically interacts with the genetic deficiency of protein disulfide oxidase ERO1 enfeebling tumor growth and spreading. ISRIB represses CHOP signal but surprisingly does not inhibit ERO1. Mechanistically, ISRIB increases the ER protein load with a prominent perturbing effect on ERO1 deficient Triple-Negative breast cells, which have adapted to live with low client protein load, while ERO1 deficiency selectively impairs VEGF-dependent angiogenesis. Strikingly, ERO1-deficient Triple Negative Breast Cancer xenografts have augmented ER stress response and PERK branch. In vivo, ISRIB synergistically with ERO1 deficiency inhibits the growth of Triple-Negative Breast cancer xenografts by impairing proliferation and angiogenesis, while it is not effective on the xenograft counterparts with ERO1. In summary, these results demonstrate that ISRIB together with ERO1 deficiency synergistically shatters a feature of the adaptive ER stress response while ERO1 deficiency selectively impairs angiogenesis in tumors, thereby together promoting tumor cytotoxicity. Therefore, our findings suggest two surprising findings in breast tumors: ERO1 is not regulated via CHOP and ISRIB represents a therapeutic option to efficiently inhibit tumor progression in those tumors with limited ERO1 and high PERK.
2022-07-20 | E-MTAB-11313 | biostudies-arrayexpress
Project description:Cannabinoid receptor type 1 (CB1R) is one of the most abundant GPCRs in the brain, playing a critical role in neuronal viability. While CB1R activation is typically associated with neuroprotective effects, excessive or prolonged activation can be adverse. CB1R antagonists, therefore, have shown neuroprotective effects against neurotoxicity by CB1R overactivation. Unexpectedly, we found that CB1R antagonists rimonabant and AM251 induce cell death in human neuroblastoma SH-SY5Y cells under serum-free conditions, but not in serum-containing conditions. Phosphoproteomic analysis was performed to elucidate this molecular pathway. Phospho-EIF2AK3 (also known as PERK) was up-regulated in both rimonabant and AM251 treatments. PERK is a transducer of ER stress. Using western blotting it was also confirmed that the downstream effectors of PERK, eIF2α/ATF4/CHOP, were up-regulated, suggesting activation of the ER stress signal pathway PERK/eIF2α/ATF4/CHOP. In summary, cell death by CB1 antagonists under serum-free conditions results from ER stress response.
2024-12-03 | PXD058518 | JPOST Repository