Human IL-33(Interleukin-33) ELISA Kit

Purpose Egg yolk (EY) may play a role during the sensitizing phase of egg allergy by exerting intestinal type 2-biasing effects. We aimed to identify the mechanism and role of EY in the induction of allergy to egg white (EW). Methods BALB/c mice were exposed intragastrically to EW, EY, or the mixture of EW:EY. In addition in vitro experiments were conducted with intestinal epithelial cells (IECs), dendritic cells (DCs), and T cells from naive mice. Inflammatory and type 2 responses were evaluated. Results Administration of EW upregulated duodenal expression of factors that influence epithelial barrier integrity and function, such asMuc2andCldn2, type 2-promoting epithelial cytokinesIl33andIl25, DC genesIrf4andTnfsf4, and Th2-cytokinesIl14andIl13. EW:EY further increased the expression ofIl25andTslpin the duodenum,Il33andTslpin the jejunum,and the proportion of lamina propria group 2 innate immune cells (ILC2s) over EW alone. Moreover, it distinctively enhanced the expression ofIrf4andCd1d1in the Peyer's patches (PPs), and ofIl6, Il33, Gata3,andIl13, both in PPs and mesenteric lymph nodes. In co-cultures of DCs and T cells, EW:EY induced a higher expression ofGata3,Il4,andIl13, secretion of IL-13 and expansion of CD4(+)T cells expressing ST2, the IL-33 receptor, than EW or EY added individually. Conclusion Co-administration of EY may promote sensitization to EW through activation of innate immune cells, such as IECs, DCs and ILC2s, that are central to the progress of allergies.

Hypertension increases the pressure load on the heart and is associated with a poorly understood chronic systemic inflammatory state. Interleukin 33 (IL-33) binds to membrane-bound ST2 (ST2L) and has antihypertrophic and antifibrotic effects in the myocardium. In contrast, soluble ST2 appears to act as a decoy receptor for IL-33, blocking myocardial and vascular benefits, and is a prognostic biomarker in patients with cardiovascular diseases. Here we report that a highly local intramyocardial IL-33/ST2 conversation regulates the heart's response to pressure overload. Either endothelial-specific deletion of IL33 or cardiomyocyte-specific deletion of ST2 exacerbated cardiac hypertrophy with pressure overload. Furthermore, pressure overload induced systemic circulating IL-33 as well as systemic circulating IL-13 and TGF-beta1; this was abolished by endothelial-specific deletion of IL33 but not by cardiomyocyte-specific deletion of IL33. Our study reveals that endothelial cell secretion of IL-33 is crucial for translating myocardial pressure overload into a selective systemic inflammatory response.