Project description:Inflammation is characterized by a biphasic cycle consisting initially of a pro-inflammatory phase which is subsequently resolved by anti-inflammatory processes. The coordination of these two disparate states needs to be highly controlled, suggesting that the regulation of the cytokines that drive these processes are intimately linked. Interleukin-1 beta (IL1B) is a master regulator of pro-inflammation and is encoded within the same topologically associated domain (TAD) as interleukin-37 (IL37). IL37 has recently emerged as a powerful anti-inflammatory cytokine which diametrically opposes the function of IL1B. Within this TAD, we identified a novel long non-coding RNA called AMANZI which negatively regulates IL1B expression and trained immunity through the induction of IL37 transcription. We found that the activation of IL37 occurs through the formation of a dynamic long-range chromatin contact that leads to the temporal delay of anti-inflammatory responses. The common variant rs16944 present in AMANZI augments this regulatory circuit, predisposing individuals to enhanced pro-inflammation or immunosuppression. Our work illuminates a chromatin-mediated biphasic circuit coordinating expression of IL1B and IL37, thereby regulating two functionally opposed states of inflammation from within a single TAD.
Project description:This network was obtained by combining (with an OR logical operator) the following list of IL1B_secretion activators:
TXNIP AND IL1B - reference in pubmed:23747245
IL1B AND hydrogen_peroxide - reference in pubmed:20023662
NLRP3_PYCARD_CASP1_complex AND IL1B AND cholesterol_crystal - reference in pubmed:23747245
IL1B AND NLRP3 AND hydrogen_peroxide - reference in pubmed:20023662
IL1B AND oxLDL AND TLR4 - reference in pubmed:23812099
IL1B AND glucose - reference in pubmed:20023662
IL1B AND IL1B_secretion - reference in pubmed:23747245
IL1B AND CASP8 - reference in pubmed:22365665
NLRP3_PYCARD_CASP1_complex AND NFE2L2 AND IL1B - reference in pubmed:23747245
PYCARD AND IL1B AND hydrogen_peroxide - reference in pubmed:20023662
IL1B AND NLRP3 AND glucose - reference in pubmed:20023662
NFE2L2 AND IL1B - reference in pubmed:23747245
IL1B AND mitochondrial_respiratory_chain_complex_I - reference in pubmed:21124315
TXNIP AND IL1B AND glucose - reference in pubmed:20023662
IL1B AND oxLDL AND CD36 - reference in pubmed:23812099
IL1B AND ripoptosome - reference in pubmed:22365665
NLRP3_PYCARD_CASP1_complex AND IL1B - reference in pubmed:23747245
Project description:To unveil HMGB1 DNA occupancy in livers of mice after a metabolic stress either induced by a 12-week high fat diet consumption or a fasting (6hours)-refeeding (8hours) challenge. Challenges known to generate a robust activation of hepatic lipogenesis and liver steatosis.
Project description:We have previously shown that Il1a-knockout (KO) mice exhibit rapid (at day 1) and persistent improvements in locomotion associated with reduced lesion volume compared with Il1b-KO mice and C57BL/6 controls after traumatic spinal cord injury (SCI). To investigate the mechanism by which Il1a mediates its detrimental effect, we analyzed the transcriptome of the injured spinal cord of Il1a-KO, Il1b-KO and C57BL/6 mice at 24 hours after SCI using GeneChip microarrays. Il1a-KO, Il1b-KO and C57BL/6 mice were subjected to a 50-kdyn SCI and a 6-mm spinal cord segment centered over the site of contusion extracted for RNA isolation and microarray analysis.