Murine anaphylaxis to food requires cysteinyl leukotriene-mediated absorption of allergens in the gut.
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ABSTRACT:
PROVIDER: PRJNA1204804 | ENA |
REPOSITORIES: ENA
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Project description:Food-specific IgE triggers life-threatening anaphylaxis; however, some people with food-specific IgE are asymptomatic upon allergen consumption. Using murine food allergy models, we discovered an unexpected pathway regulating the ability of food allergens to trigger anaphylaxis. C57BL/6 mice are uniquely resistant to anaphylaxis when challenged orally; we show that their gut barrier was impermeable to food allergens relative to anaphylaxis-susceptible strains, even prior to allergic sensitization. In a forward genetic screen, oral anaphylaxis resistance correlated with Dipeptidase1 (Dpep1) allelic variants. DPEP1 is expressed in intestinal epithelium and catabolizes leukotriene D4. Blocking DPEP1 with cilastatin enhanced allergen absorption in resistant mice. Conversely, pre-treatment of susceptible mice with a leukotriene synthesis inhibitor, zileuton, abrogated allergen absorption and subsequent oral anaphylaxis. Inhibiting leukotrienes may be a novel treatment for food allergy.
2025-08-13 | GSE261022 | GEO
Project description:Food-specific IgE triggers life-threatening anaphylaxis; however, some people with food-specific IgE are asymptomatic upon allergen consumption. Using murine food allergy models, we discovered an unexpected pathway regulating the ability of food allergens to trigger anaphylaxis. C57BL/6 mice are uniquely resistant to anaphylaxis when challenged orally; we show that goblet cells transport less food allergens relative to anaphylaxis-susceptible strains, even prior to allergic sensitization. In a forward genetic screen, oral anaphylaxis resistance correlated with Dipeptidase1 (Dpep1) allelic variants. DPEP1 is expressed in intestinal epithelium and catabolizes leukotriene D4 (LTD4). Blocking DPEP1 with cilastatin, genetically deleting Dpep1, or oral administration of LTD4 enhanced allergen transport in resistant mice. Conversely, pre-treatment of susceptible mice with a leukotriene synthesis inhibitor, zileuton, abrogated allergen absorption from the gut and subsequent oral anaphylaxis. Inhibiting leukotrienes may be a novel treatment for food allergy.
2025-08-13 | GSE285568 | GEO
Project description:Murine anaphylaxis to food requires cysteinyl leukotriene-mediated absorption of allergens in the gut
| PRJNA1084834 | ENA
Project description:Background: Cysteinyl leukotrienes (cysLTs) are important mediators of innate immune responsiveness and chronic inflammatory diseases. CysLTs acting through cysteinyl leukotriene receptors may influence the migration and activity of cells such as eosinophils, monocytes and dendritic cells. Objective: To determine the gene expression signature of human monocytes in response to cysLTs and to elucidate the signaling pathways involved in monocyte activation. Methods: Gene expression was analyzed using oligonucleotide microarrays. Responsiveness to cysLTs was assessed by real-time PCR, calcium flux, kinase activation and chemotaxis assays. Results: Cysteinyl leukotriene type I receptor (CysLTR1) transcript 1 is predominantly expressed in human monocytes and cysLTs signal through CysLTR1 in these cells. Several immediate-early genes, including early growth response (Egr) -2, 3, FosB, activating transcription factor 3 and nuclear receptor subfamily 4 were significantly induced by LTD4. This effect was mediated by CysLTR1 coupled to Gαi/o, activation of phospholipase C, and inositol-1,4,5-triphosphate (IP3) and store operated calcium channels. LTD4 induced p38 MAP kinase phosphorylation, a pathway also involved in the regulation of immediate-early genes expression in monocytes. LTD4 stimulated monocyte chemotactic activity that was fully blocked by a selective CysLTR1 inhibitor MK571 and pertussis toxin, suggesting that CysLTR1 coupled to Gαi/o is a dominant functional pathway in human monocytes. Conclusion: Our data show that cysLTs acting through CysLTR1 can significantly influence the activation and migration of human monocytes and that these effects can be fully inhibited by CysLTR1 antagonists. Clinical implications: Antileukotriene therapies are likely to significantly block the proinflammatory functions of human monocytes. Experiment Overall Design: 4 control sample, 4 LTD4 stimulated samples
2008-06-15 | E-GEOD-7807 | biostudies-arrayexpress
Project description:Anaphylaxis is a life-threatening complication of allergen exposure. While mechanisms governing anaphylaxis after intravenous injection have been defined in mice, these models neglect mucosal exposure that accompanies food ingestion. We investigated the role of mast cell populations within the intestine of mice in response to antigens delivered orally. Oral anaphylaxis required IgE-FcεR1 signaling, and profiling of intestinal mast cells revealed a rapidly developing population shaped by epithelial cues. Intestinal mast cells were largely epithelium-resident and displayed divergent transcriptomes and effector functions from connective tissue mast cells found throughout the body. Histamine synthesis was diminished and leukotriene generation enhanced. Mice genetically deficient in cysteinyl leukotriene synthesis, or those treated with aLOX5 antagonist, Zileuton, were protected from oral anaphylaxis whereas that elicited by intravenous injection was unaltered.
2025-08-07 | GSE293904 | GEO
Project description:Anaphylaxis is a life-threatening complication of allergen exposure. While mechanisms governing anaphylaxis after intravenous injection have been defined in mice, these models neglect mucosal exposure that accompanies food ingestion. We investigated the role of mast cell populations within the intestine of mice in response to antigens delivered orally. Oral anaphylaxis required IgE-FcεR1 signaling, and profiling of intestinal mast cells revealed a rapidly developing population shaped by epithelial cues. Intestinal mast cells were largely epithelium-resident and displayed divergent transcriptomes and effector functions from connective tissue mast cells found throughout the body. Histamine synthesis was diminished and leukotriene generation enhanced. Mice genetically deficient in cysteinyl leukotriene synthesis, or those treated with aLOX5 antagonist, Zileuton, were protected from oral anaphylaxis whereas that elicited by intravenous injection was unaltered.
2025-08-07 | GSE293561 | GEO
Project description:Background: Cysteinyl leukotrienes (cysLTs) are important mediators of innate immune responsiveness and chronic inflammatory diseases. CysLTs acting through cysteinyl leukotriene receptors may influence the migration and activity of cells such as eosinophils, monocytes and dendritic cells. Objective: To determine the gene expression signature of human monocytes in response to cysLTs and to elucidate the signaling pathways involved in monocyte activation. Methods: Gene expression was analyzed using oligonucleotide microarrays. Responsiveness to cysLTs was assessed by real-time PCR, calcium flux, kinase activation and chemotaxis assays. Results: Cysteinyl leukotriene type I receptor (CysLTR1) transcript 1 is predominantly expressed in human monocytes and cysLTs signal through CysLTR1 in these cells. Several immediate-early genes, including early growth response (Egr) -2, 3, FosB, activating transcription factor 3 and nuclear receptor subfamily 4 were significantly induced by LTD4. This effect was mediated by CysLTR1 coupled to Gαi/o, activation of phospholipase C, and inositol-1,4,5-triphosphate (IP3) and store operated calcium channels. LTD4 induced p38 MAP kinase phosphorylation, a pathway also involved in the regulation of immediate-early genes expression in monocytes. LTD4 stimulated monocyte chemotactic activity that was fully blocked by a selective CysLTR1 inhibitor MK571 and pertussis toxin, suggesting that CysLTR1 coupled to Gαi/o is a dominant functional pathway in human monocytes. Conclusion: Our data show that cysLTs acting through CysLTR1 can significantly influence the activation and migration of human monocytes and that these effects can be fully inhibited by CysLTR1 antagonists. Clinical implications: Antileukotriene therapies are likely to significantly block the proinflammatory functions of human monocytes. Keywords: monocytes stimulated with LTD4
2007-08-30 | GSE7807 | GEO
Project description:Gene expression was profiled in peripheral blood samples collected over three time points from patients during acute anaphylaxis and from healthy controls. Patients presented to the Emergency Department (ED) at Royal Perth Hospital with acute, moderately severe anaphylaxis. Samples were collected at ED arrival (T0), 1 hour later (T1), and 3 hours post arrival (T2). The study design consisted of 12 subjects, 3 time points, and 2 clinical states (acute anaphylaxis, healthy controls).
2014-07-02 | E-GEOD-47655 | biostudies-arrayexpress
Project description:Anaphylaxis is the most severe manifestation of allergic disorders. Currently, an increasing number of cells, pathways and molecules involved in the etiopathogenesis of anaphylaxis are being discovered. However, there are no conclusive biomarkers to confirm its diagnosis. Small non-coding RNAs (sncRNAs) are 18-200 nucleotide molecules that can be divided into: microRNAs (miRNAs), Piwi-interacting RNAs (piRNAs), small nucleolar RNAs (snoRNAs), small nuclear RNAs (snRNAs), transference RNA derived fragments (tRFs) and YRNA derived fragments (YRFs). These molecules participate in cell-cell communication modulating various physiological processes and have been postulated as non-invasive biomarkers of several pathologies. Therefore, in this study we characterized the serum circulating profile of other two populations of 5 adults and 5 children with drug- and food- mediated anaphylaxis, respectively. Samples were obtained from each patient under two different conditions: during anaphylaxis and 14 days after the reaction (control).
2023-10-19 | GSE245653 | GEO
Project description:Human umbilical vein endothelial cells (HUVEC) or the human macrophage cell line, Mono-Mac-6, treated with Leukotriene D4 for 1 hour Keywords = Leukotriene-Transcriptome Keywords = Mono-Mac-6 Keywords = HUVEC Keywords: other
2004-08-20 | GSE1644 | GEO