Project description:Determination of the molecular mechanism of IL33 on glioma cells Since IL-33 is known to associate with chromatin and regulate transcriptional activity and that nuclear expression of IL-33 increases glioma progression, we determined Nuclear IL-33 regulates the expression and secretion of inflammatory cytokines in glioma cells. Using these parameters 340 genes were induced by the ectopic expression of IL-33 and an additional 377 genes were downregulated. Gene ontology terms over-represented in the genes induced by IL-33 include three major clusters that associate with cytokine activity and inflammation
Project description:Interleukin-33 (IL-33), a member of the IL-1 superfamily cytokines, is an endogenous danger signal and a nuclear-associated cytokine. It is one of the essential mediators of both innate and adaptive immune responses. Aberrant IL-33 signaling has been demonstrated to play a defensive role against various infectious and inflammatory diseases. Although the signaling responses mediated by IL-33 have been previously reported, the temporal signalingdynamicsare yet to be explored. Towards this end,we applied quantitative temporal phosphoproteomics analysis to elucidate pathways and proteins induced by IL-33 in THP1 monocytes. Employing TMT labeling-based quantitation and titanium dioxide (TiO2)-based phosphopeptide enrichment strategy followed by mass spectrometry analysis, we identified 14,515 phosphorylation sites mapping to 4,174 proteins across (0 min to 240 mins)time points.
Project description:In order to further understand how glioma-derived IL-33 is orchestrating changes within the tumor microenvironment and based on the significant increase of anti-inflammatory mediators including a number of signaling molecules observed in IL-33+ tumors, we performed phospho-proteomic analysis using mass spectrometry on the brains of tumor-bearing mice.
Project description:Interleukin-33 (IL-33) is a member of the IL-1 family of cytokines that play a central role in the regulation of immune responses. IL-33 signaling, from the early signaling events triggered by the ligand-activated receptor to result in activation of early and late signaling events, such as proteome changes. In this study, THP1 (monocyte) cell line model was stimulated with IL-33 (50 ng/ml) for varying duration (5, 10, 15, 30, 40, 60, 120 and 240 mins). We carried out in-depth proteomic analysis using high-resolution LC-MS/MS. Our analysis resulted in the identification of 64,030 peptides corresponding to 7947 protein groups. Differentially regulated proteins identified in this study could be targeted for developing an inflammatory immune response.
Project description:IL33 is a dual function cytokine which acts as a major orchestrator of the brain tumor microenvironment that contributes to tumorigenesis. We found that IL33 is expressed in a large subset of human glioma patient specimens and murine glioma models and that its expression is directly associated with the increased presence of tumor associated macrophages/monocytes/microglia. We analyzed the differences in the IL-33+ and IL-33- innate immune microenvironments at a single cell resolution and found substantial differences in the immune populations present and gene expression changes which may contribute to the increased tumoirgenicity of IL-33+ tumors.
Project description:Interleukin-33 (IL-33) is a novel member of the IL-1 family of cytokines that plays diverse roles in the regulation of immune responses. IL-33 exerts its effects by binding to a heterodimeric receptor complex consisting of interleukin-1 receptor like 1 (IL1RL1) and an accessory receptor protein IL-1RAcP resulting in the production and release of proinflammatory cytokines. A detailed understanding of the signaling pathways activated by IL-33 remains elusive. To elucidate IL-33 mediated signaling, we performed a global quantitative phosphoproteomic analysis using stable isotope labeling by amino acids in cell culture. Employing anti-phosphotyrosine antibodies and titanium dioxide-based enrichment strategies, we identified 6,207 phosphorylation sites mapping to 2,013 phosphoproteins of which more than 185 phosphosites are regulated by IL-33 stimulation. Our findings will greatly expand the understanding of IL-33 signaling and provide novel therapeutic targets for IL-33/IL-33R-associated diseases in humans.
Project description:To validate the modulation of inflammatory genes by ectopic IL-33, we performed Gene expression analysis using the nCounter Mouse v2 Inflammation Panel. This result validated a significant increase in a number of anti-inflammatory cytokines in the IL-33+ xenografts that were absent in the DNLS xenografts