The role of aD in sepsis
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA890560 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR21903136_1.fastq.gz | Fastqsanger.gz | |||
| SRR21903136_2.fastq.gz | Fastqsanger.gz | |||
| SRR21903137_1.fastq.gz | Fastqsanger.gz | |||
| SRR21903137_2.fastq.gz | Fastqsanger.gz | |||
| SRR21903138_1.fastq.gz | Fastqsanger.gz |
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Project description:In sepsis, limited food intake and increased energy expenditure induce a starvation response, which is compromised by a quick decline in expression of hepatic PPARα, a transcription factor essential in intracellular catabolism of free fatty acids. The mechanism upstream of this PPARα downregulation is unknown. We found that sepsis causes a progressive hepatic loss-of-function of HNF4α, which has strong impact on the expression of several important nuclear receptors, including PPARα. HNF4α depletion in hepatocytes dramatically increases sepsis lethality, steatosis and organ damage and prevents an adequate response towards IL6, which is critical for liver regeneration and survival. An HNF4α agonist protects against sepsis at all possible levels, irrespectively of bacterial loads, suggesting HNF4α is crucial in disease tolerance to sepsis. In conclusion, hepatic HNF4α fails in sepsis, causing PPARα downregulation and metabolic problems and a disturbed IL6-mediated acute phase response. The data open new insights and therapeutic options in sepsis.
2023-10-31 | GSE244821 | GEO
Project description:Sepsis is a maladaptive host response towards an infection leading to tissue damage, organ failure, and ultimately death. In sepsis, limited food intake and increased energy expenditure induce a starvation response, which is hindered by hepatic disappearance of the key transcription factor PPARα. Since PPARα acts as a central player in intracellular catabolism of fatty acids (FAs), sepsis results in excess free FAs, which cause lipotoxicity. The mechanism upstream of the PPARα downregulation in sepsis is unknown. A potential mechanism resides in HNF4α, which regulates liver lipid metabolism directly by activating Ppara gene expression and indirectly by interacting with PPARα itself. A proper functioning of HNF4α is essential for maintaining liver identity. We here show that sepsis causes a progressive HNF4α loss-of-function in the liver, which impacts expression of several nuclear receptors, among which PPARα, and is characterized by a reduced HNF4α DNA binding. Specific HNF4α depletion in the liver dramatically worsens sepsis lethality, associated with increased steatosis and hepatocyte damage. HNF4α dysfunction also prevents an adequate response towards IL6, controlled by CEBPβ and STAT3, which is critical for a proper liver regeneration and survival. In addition, the HNF4α agonist NCT partially protects against sepsis by limiting hepatic steatosis and liver dysfunction. In conclusion, hepatic HNF4α fails in sepsis, causing PPARα downregulation and consequent metabolic problems on the one hand, and a disturbed IL6-mediated acute phase response and regeneration on the other hand. The data open new insights and therapeutic options in sepsis
2024-03-12 | GSE260577 | GEO
Project description:In sepsis, limited food intake and increased energy expenditure induce a starvation response, which is compromised by a quick decline in expression of hepatic PPARα, a transcription factor essential in intracellular catabolism of free fatty acids. The mechanism upstream of this PPARα downregulation is unknown. We found that sepsis causes a progressive hepatic loss-of-function of HNF4α, which has strong impact on the expression of several important nuclear receptors, including PPARα. HNF4α depletion in hepatocytes dramatically increases sepsis lethality, steatosis and organ damage and prevents an adequate response towards IL6, which is critical for liver regeneration and survival. An HNF4α agonist protects against sepsis at all possible levels, irrespectively of bacterial loads, suggesting HNF4α is crucial in disease tolerance to sepsis. In conclusion, hepatic HNF4α fails in sepsis, causing PPARα downregulation and metabolic problems and a disturbed IL6-mediated acute phase response. The data open new insights and therapeutic options in sepsis.
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2011-10-19 | GSE33037 | GEO
Project description:Background : The aim of this study is to improve our understanding of the mechanisms underlying the role of sepsis in the limb muscles of ICU patients with acute quadriplegic myopathy (AQM) by using a unique porcine ICU model, i.e., 5-day longitudinal experiments where animals are sedated, mechanically ventilated and exposed to factor triggering AQM that is endotoxin-induced sepsis. Results : An increased expression of genes involved in chemokine activity and transcriptional regulation. A decreased expression in genes regulating heat shock proteins, cytoskeletal & sarcomeric and oxidative stress response were also apparent. Therefore, it appears that sepsis has an additive deleterious role in acute quadriplegic myopathy. Sepsis-induced molecular mechanisms involving chemokine/innate immunity and heat shock proteins are forwarded as probable mechanisms underlying the decreased force generating capacity. Conclusions : This sepsis had significant effect on biceps femoris muscle force-generation capacity but not on fiber size. However, significant differences were observed between the MV and MV+SEP in the transcriptional regulation of an increased expression of genes involved in chemokine activity genes like MCP-1 and transcriptional regulation genes like JUNB, STAT3 and BHLHB2. A decreased expression in genes regulating heat shock proteins like HSP 90, HSP 70 and αB-crystallin, cytoskeletal & sarcomeric like MAP1A, MyBP-C1 and MYH7 and oxidative stress response like SRXN1 and SOD2 were also apparent. Therefore, it appears that sepsis has an additive negative role in acute quadriplegic myopathy. Four female domestic piglets (Sus scrofa, average body weight 25.5 kg) were used in this study. Piglets were immobilized by anesthesia and mechanically ventilated via a tracheotomy for a period of five days. During this study period, the animals were sedated using isoflurane inhalation (Abbott Laboratories, Chicago, Il, USA, 0.8 – 1.3% end-tidal concentration) supplemented by intravenous bolus doses of morphine and ketamine as needed. Core body temperature (blood) was maintained in the range of 38.5 – 40°C by a servo controlled heating pad. The animals received intravenous crystalloid fluid (Ringeracetat) to maintain stable blood pressure and urinary output and a glucose infusion (Rehydrex, Fresenius Kabi, Stockholm, Sweden, 25 mg glucose /mL) in the range of 0.5 – 1.5 mg/kg/minute to decrease the effects of catabolism. Each animal received prophylactic streptomycin 750 mg/d and bensylpenicillin 600 mg/d (Streptocillin Vet, Boeringer-Ingelheim, Hellerup, Denmark). Arterial blood gas analysis as well as electrolytes and blood glucose levels were monitored regularly and kept in the normal range throughout the study period. A neuromuscular blocking agent (NMBA) was administered as a continuous infusion of pancuronium bromide 0.1mg/kg/h (Pavolun; Organon, Boxtel, The Netherlands) for 5days while a corticosteroid (CS) was given as bolus doses of betamethasone 0.1 mg/kg (Betapred; GSK, Slona, Sweden) twice daily for 5days. Endotoxemia was induced by a continuous infusion of Escherichia coli endotoxin, serotype O26:B6 (Sigma Labkemi, Stockholm, Sweden) at 36 µg/kg/h for 1h. Key words : Treatment, immobilization, muscle function.
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Project description:We systematically assessed the transcriptomic changes of livers of MxCreFthD/D vs. Fthlox/lox mice after induction of polymicrobial sepsis using Cecal Ligation and Puncture. Data indicates a distinct set of genes differentially regulated between MxCreFthD/D and Fthlox/lox mice after sepsis induction reflecting altered iron and glucose metabolism.
2017-08-15 | GSE92703 | GEO