Active clinical trials for "Hypersensitivity"

Acute per-anesthetic hypersensitivity reaction (HSA-PA) is a rapidly occurring systemic reaction following injection of a drug during anesthesia (mortality between 3 and 9%). The substances responsible for these reactions in France are curare in 60% of cases, followed by antibiotics. The main mechanism mentioned is an immediate systemic hypersensitivity immune reaction mediated by IgE antibodies (anaphylaxis). NeuroMuscular Blocking Agents (NMBA; curare) relax skeletal muscles to facilitate surgeries and permit intubation, but lead to adverse reactions: (a) severe hypersensitivity reactions (anaphylaxis) thought to rely on pre-existing anti-NMBA antibodies; (b) complications due to postoperative residual curarization. Identification of patients at risk remains suboptimal due to the lack of adequate tools to detect anti-NMBA antibodies. A capturing agent exists for only one out of the four most used NMBAs, allowing reversal of profound curarization. Case reports suggested that it might also ameliorate an ongoing anaphylaxis due to that NMBA. Based on strong preliminary results, our study proposes to characterize anti-drugs antibody repertoires in patients with various NMBA or antibiotics-anaphylaxis, describe activation pathways leading to anaphylaxis, develop and validate diagnostic and therapeutic molecules to ameliorate patient screening, NMBA-anaphylaxis and reverse profound neuromuscular block.

The ragweed Ambrosia artemisiifolia is spreading in northern Europe due to climate change. The pollen are considered highly allergenic and might trigger allergy symptoms at much lower concentrations than e.g. grass or birch pollen. This study aims to determine threshold concentrations for ragweed and birch pollen in patients with seasonal allergic rhinitis. Participants will be exposed in an allergen challenge chamber that was technically modified to maintain very low and stable pollen concentrations for several hours. The study design is adaptive, where the pollen concentrations are escalated or de-escalated based on interim analysis of resulting allergic symptoms.

Randomized, double-blind placebo-controlled phase I trial with the primary aim to investigate safety and tolerability of three ascending dosing schemes of DM-101-PX in birch pollen allergic adults. As an explorative objective, the trial will also investigate the effect of DM-101PX on the allergic symptoms following birch pollen allergen exposure in a chamber. Expanded access to the study treatment is not available.

The ability of the brain to sense changing sodium levels in the blood is critical in mediating the neurohumoral responses to hypernatremia, however, the mechanisms underlying sodium sensing in humans is poorly understood. The purpose of this study is to identify key sodium-sensing regions of the human brain in older adults and determine if the Na-K-2Cl co-transporter mediates the neurohumoral response to acute hypernatremia. Completion of this project will increase our understanding of blood pressure regulation, which has major public health implications.

Food allergy (FA) derives from an abnormal immunological response to dietary antigens. On the basis of the immunological mechanism, FA are divided into the following forms: IgE-mediated, non-IgE-mediated and mixed. Prevalence, persistence and severity of pediatric FA have significantly increased over the past 2 decades. The treatment of FA is based on a rigorous elimination diet and on the correct management of acute allergic reactions, induced by the accidental ingestion of food allergens, with antihistamines, cortisones and adrenaline. Ensuring a strict exclusion of the allergen from the diet can be problematic, with the risk of nutritional deficiencies, accidental exposure, cross-contamination or caused by incorrect labeling of processed food products. At the same time, the daily management of a correct elimination diet and a possible allergic reaction, entail a significant burden and high levels of anxiety and stress associated with uncertainty about the management of anaphylaxis, in the parents of children with FA, particularly in mothers, resulting in an impact on Quality of Life (QoL). The availability of a multidisciplinary team made up of pediatricians, allergists and dietitians / nutritionists with experience in the field of FA could reduce the stress and anxiety of parents, while improving their QoL. Currently, for the evaluation of the quality of life of the parent of a child with FA, specific questionnaires for food allergies developed and validated in English are used: the food allergy self-efficacy scale for parents (FASE-P) and the Food Allergy Quality of Life - Parental Burden Questionnaire (FAQL-PB).

Effect of acute psychosocial stress on esophageal sensitivity in healthy volunteers.

Non-celiac gluten sensitivity (NCGS) is a condition where intestinal and extraintestinal symptoms are triggered by gluten ingestion in the absence of celiac disease and wheat allergy. Despite the great interest in NCGS, much remains unknown about the pathogenesis. Some studies seem to suggest that wheat components other than gluten (i.e. amylase/trypsine inhibitors, ATIs) can cause the symptoms, and therefore the term "non-celiac wheat sensitivity" (NCWS) has been proposed instead of NCGS. It is believed that this condition is worldwide increasing, due to the evolution of wheat breeding (i.e. consumption of wheats with high gluten content), and that ancient wheats are better tolerated by NCWS patients than the modern ones. Therefore, the aim of the study is to determine whether the common belief regarding the fact that ancient wheats are better tolerated by NCWS patients than the modern ones is confirmed by scientific data, and to identify the wheat kernel components triggering this pathology. The availability of wheat materials with opposite characteristics, such as the period of development (ancient vs. modern), or the technological properties (cultivars with weak glutens vs. strong gluten), or the presence/absence of specific ATIs polypeptides, will allow to define the role played by these factors. Therefore, the study has two objectives: 1) extraction and testing of total kernel proteins, in order to evaluate the inflammatory response to gluten and non-gluten proteins by peripheral blood mononuclear cells (PBMC) and immunocytes extracted by the rectal mucosa of NCWS patients and healthy control subjects, and 2) clinically testing two wheat genotypes, selected on the basis of the previous in vitro studies, showing the highest and the lowest in vitro inflammatory response, in order to verify their effect in triggering NCWS symptoms.

Cow's Milk Allergy (CMA) affects between 2-3% of young children but its severity varies between regions/countries. While the long-term prognosis for CMA is good, with the majority (80-90%) of children outgrowing their allergy by around 3-5 years. Breast feeding is the most optimal form of feeding for all infants, regardless of their condition, and in those with CMA maternal dairy exclusion is recommended as first line treatment. In non-breast fed or mixed feeding, a hypoallergenic milk substitute is recommended for young infants. The AAP and other societies such as EAACI and ESPGHAN considers a formula to be 'hypoallergenic' if at least 90% of children with documented CMA tolerate it, with a 95% CI, under double-blind, placebo-controlled conditions.This equates to at least 29 children who should tolerate the product following blind and open challenge.

Aim of the study is to improve the diagnosis of food allergy and hypersensitivity. Intestinal homogenates will be used to determine total IgE, specific IgE, tryptase, histamine and inflammation parameters (IFNgamma, TNFalpha). These data will be correlated with serum values and disease status. In addition, organoids from duodenal tissue will be isolated and cultured in vitro and stimulated with the major food allergens. The gene and protein expression will be checked to identify relevant biomarkers.

Epidemiological studies have revealed that 60-80% of women with breast cancer (BC) develop metabolic disorders that are similar to those observed in conditions like type 2 diabetes. These metabolic disorders, including insulin resistance, obesity, hyperinsulinemia, and glucose intolerance, are associated with increased BC recurrence and mortality. Skeletal muscle is the major site of glucose uptake in humans. The aims of the present project are to 1) determine the involvement of insulin resistance in skeletal muscle in the metabolic disorders prevalent in BC survivors, 2) identify BC-and/or treatment-induced molecular changes in skeletal muscle from BC survivors .