scholarly journals Mouse Chow Composition Influences Immune Responses and Food Allergy Development in a Mouse Model

Nutrients ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1775 ◽  
Author(s):  
Eleonore Weidmann ◽  
Nazanin Samadi ◽  
Martina Klems ◽  
Denise Heiden ◽  
Klara Seppova ◽  
...  
Keyword(s):  
Food Allergy ◽  
Mouse Model ◽  
Immune Responses ◽  
Oral Tolerance ◽  
Specific Ige ◽  
Allergy Prevention ◽  
Lower Fatty Acid ◽  
Immunological Effect ◽  
Gastric Acid Suppression ◽  
Antibody Levels

Our diet is known to substantially influence the immune response not only by support of mucosal barriers but also via direct impact on immune cells. Thus, it was of great interest to compare the immunological effect of two mouse chows with substantial differences regarding micro-, macronutrient, lipid and vitamin content on the food allergic response in our previously established mouse model. As the two mouse chows of interest, we used a soy containing feed with lower fatty acid (FA) amount (soy-containing feed) and compared it to a soy free mouse chow (soy-free feed) in an established protocol of oral immunizations with Ovalbumin (OVA) under gastric acid suppression. In the animals receiving soy-containing feed, OVA-specific IgE, IgG1, IgG2a antibody levels were significantly elevated and food allergy was evidenced by a drop of body temperature after oral immunizations. In contrast, mice on soy-free diet had significantly higher levels of IL-10 and were protected from food allergy development. In conclusion, soy-containing feed was auxiliary during sensitizations, while soy-free feed supported oral tolerance development and food allergy prevention.

scholarly journals Addressing Common Misconceptions in Food Allergy: A Review

Children ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 497
Author(s):  
Aikaterini Anagnostou
Keyword(s):  
Food Allergy ◽  
The United States ◽  
Specific Ige ◽  
Oral Immunotherapy ◽  
Food Allergies ◽  
Allergy Prevention ◽  
Diagnosis And Management ◽  
Skin Prick Tests ◽  
Food Specific Ige ◽  
Common Misconceptions

Background: Food allergies are common, affecting 1 in 13 school children in the United States and their prevalence is increasing. Many misconceptions exist with regards to food allergy prevention, diagnosis and management. Objective: The main objective of this review is to address misconceptions with regards to food allergies and discuss the optimal, evidence-based approach for patients who carry this diagnosis. Observations: Common misconceptions in terms of food allergy prevention include beliefs that breastfeeding and delayed introduction of allergenic foods prevent the development of food allergies. In terms of diagnosis, statements such as ‘larger skin prick tests or/and higher levels of food-specific IgE can predict the severity of food-induced allergic reactions’, or ‘Tryptase is always elevated in food-induced anaphylaxis’ are inaccurate. Additionally, egg allergy is not a contraindication for receiving the influenza vaccine, food-allergy related fatalities are rare and peanut oral immunotherapy, despite reported benefits, is not a cure for food allergies. Finally, not all infants with eczema will develop food allergies and epinephrine auto-injectors may unfortunately be both unavailable and underused in food-triggered anaphylaxis. Conclusions and relevance: Healthcare professionals must be familiar with recent evidence in the food allergy field and avoid common misunderstandings that may negatively affect prevention, diagnosis and management of this chronic disease.

scholarly journals Gastric Enzyme Supplementation Inhibits Food Allergy in a BALB/c Mouse Model

Nutrients ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 738
Author(s):  
Nazanin Samadi ◽  
Denise Heiden ◽  
Martina Klems ◽  
Martina Salzmann ◽  
Johanna Rohrhofer ◽  
...  
Keyword(s):  
Food Allergy ◽  
Mouse Model ◽  
Gastric Acid ◽  
Clinical Symptoms ◽  
Acid Suppression ◽  
Gastric Digestion ◽  
Enzyme Solution ◽  
Allergic Symptoms ◽  
Gastric Acid Suppression ◽  
The Impact

Impaired gastric digestion due to suppressed gastric acidity enhances the risk for food allergy development. In the current study, we aimed to evaluate the impact of a supported gastric digestion via application of a pharmaceutical gastric enzyme solution (GES) on food allergy development and allergic reactions in a BALB/c mouse model. The ability of the GES to restore hypoacidic conditions was tested in mice treated with gastric acid suppression medication. To evaluate the impact on allergic symptoms, mice were orally sensitized with ovalbumin (OVA) under gastric acid suppression and subjected to oral challenges with or without GES. The immune response was evaluated by measurement of antibody titers, cytokine levels, mucosal allergy effector cell influx and regulatory T-cell counts. Clinical response was objectified by core body temperature measurements after oral OVA challenge. Supplementation of GES transiently restored physiological pH levels in the stomach after pharmaceutical gastric acid suppression. During oral sensitization, supplementation of gastric enzymes significantly reduced systemic IgE, IgG1 and IgG2a levels and allergic symptoms. In food allergic mice, clinical symptoms were reduced by co-administration of the gastric enzyme solution. Support of gastric digestion efficiently prevents food allergy induction and alleviates clinical symptoms in our food allergy model.

scholarly journals Strategies and Future Opportunities for the Prevention, Diagnosis, and Management of Cow Milk Allergy

2021 ◽  
Vol 12 ◽  
Author(s):  
Benjamin Zepeda-Ortega ◽  
Anne Goh ◽  
Paraskevi Xepapadaki ◽  
Aline Sprikkelman ◽  
Nicolaos Nicolaou ◽  
...  
Keyword(s):  
Food Allergy ◽  
Primary Prevention ◽  
Oral Tolerance ◽  
Economic Benefits ◽  
Cow Milk ◽  
Allergy Prevention ◽  
Milk Allergy ◽  
Breastfed Infants ◽  
Cow Milk Allergy ◽  
History Of

The prevalence of food allergy has increased over the last 20-30 years, including cow milk allergy (CMA) which is one of the most common causes of infant food allergy. International allergy experts met in 2019 to discuss broad topics in allergy prevention and management of CMA including current challenges and future opportunities. The highlights of the meeting combined with recently published developments are presented here. Primary prevention of CMA should start from pre-pregnancy with a focus on a healthy lifestyle and food diversity to ensure adequate transfer of inhibitory IgG- allergen immune complexes across the placenta especially in mothers with a history of allergic diseases and planned c-section delivery. For non-breastfed infants, there is controversy about the preventive role of partially hydrolyzed formulae (pHF) despite some evidence of health economic benefits among those with a family history of allergy. Clinical management of CMA consists of secondary prevention with a focus on the development of early oral tolerance. The use of extensive Hydrolysate Formulae (eHF) is the nutrition of choice for the majority of non-breastfed infants with CMA; potentially with pre-, probiotics and LCPUFA to support early oral tolerance induction. Future opportunities are, among others, pre- and probiotics supplementation for mothers and high-risk infants for the primary prevention of CMA. A controlled prospective study implementing a step-down milk formulae ladder with various degrees of hydrolysate is proposed for food challenges and early development of oral tolerance. This provides a more precise gradation of milk protein exposure than those currently recommended.

scholarly journals CLINICAL AND LABORATORY ASPECTS OF DETECTING SPECIFIC IgE ANTIBODIES TO COW’S MILK AND ITS COMPONENTS

2019 ◽  
Vol 21 (5) ◽  
pp. 937-944
Author(s):  
N. A. Alkhutova ◽  
N. A. Kovyazina ◽  
O. L. Zhizhina
Keyword(s):  
Food Allergy ◽  
Clinical Signs ◽  
Specific Ige ◽  
Infants And Children ◽  
Cow Milk ◽  
School Age ◽  
Milk Allergy ◽  
Ige Antibodies ◽  
Specific Ige Antibodies ◽  
Antibody Levels

Food allergy against cow milk and its components is highly prevalent among infants and children of pre-school and young school age being a sufficient factor influencing health condition of children during the maturation period. Clinical signs of the milk allergy are non-specific, and they may be pronounced or expressed in mild form, thus enabling hypodiagnistics of this disorder. Moreover, a variety of milk antigens determines different clinical course of this allergic condition and brings additional difficulties to its diagnostics and treatment. Meanwhile, a sensibilization for the cow milk proteins may sometimes trigger a generalized atopy and bronchial asthma, being a factor delayed growth and other health disorders. At the present time, there are no distinct risk criteria for milk allergy. Therefore, its successful prophylaxis and treatment largely depends on the competence of clinical allergologist and informativity of the diagnostic techniques used. So far, however, we have no generally approved laboratory algorithms for diagnostics and monitoring of treatment efficiency in the cow milk allergy and its compomemts.We have performed a laboratory study of 187 children at the age of 3 months to 10 years. An immunochemoluminescent assay of specific IgE antibody levels to the cow milk using IMMULITE 2000/XPi analyzer has revealed its good informative value at different approaches to prediction and evaluation of food allergy treatment, both oriented for a critical cutoff value of 3 МU/L, and by monitoring a decrease in antibody levels. The authors consider rational an extended indefinity principle during the patient-oriented interpretation of IgE assay results if clinical decision is based on critical value of the index. In cases of clinical monitoring, the limit of interim reproducibility should be taken into account. The prevalence of specific cow milk antibodies among the boys was higher than among girls, however, with lesser frequency of moderate/high reactivity among the males. Moreover. the cases were detected with higher levels of anti-beta-lactalbumin IgG than those against whole milk. This finding should be considered during the screening studies.On the basis of literature analysis and own results, the authors propose an extensive study of specific IgE antibodies against cow milk and its components in blood serum of infants and children form the pre-school and junior school age groups. 

Aggravation of Food Allergy by Skin Sensitization via Systemic Th2 Enhancement

2020 ◽  
pp. 1-9
Author(s):  
Risa Koshiba ◽  
Takafumi Oba ◽  
Arisa Fuwa ◽  
Katsuhiko Arai ◽  
Nobumitsu Sasaki ◽  
...  
Keyword(s):  
Food Allergy ◽  
T Cell Receptors ◽  
Oral Tolerance ◽  
Cytokine Production ◽  
Specific Ige ◽  
Food Allergies ◽  
Skin Sensitization ◽  
Healthy Skin ◽  
Th2 Responses ◽  
The Relationship

<b><i>Background:</i></b> Recently, the relationship between antigen contact via skin (skin sensitization) and the development of food allergies has gained increasing attention. However, few studies have examined the effects of skin sensitization on healthy skin. <b><i>Objective:</i></b> To examine the effect of sensitization in healthy skin on IgE and cytokine production during food allergy development. <b><i>Methods:</i></b> The effect of skin sensitization on food allergy was evaluated using DO11.10 mice whose T cells express ovalbumin (OVA)-specific T-cell receptors. OVA was applied to the back skin of mice dehaired by various methods, and then food allergy was induced by providing them with an OVA-containing diet. OVA-specific IgE production in the sera and decreases in body temperature due to anaphylactic reaction were measured as indicators of food allergy. In addition, IL-4 production and proliferation of splenocytes were measured in mice with food allergy after skin sensitization. <b><i>Results:</i></b> Skin sensitization in healthy skin increased IgE production and exacerbated anaphylactic symptoms induced by ingesting the antigen. Moreover, skin sensitization enhanced IL-4 production from splenocytes during the onset of food allergy. In contrast, oral tolerance was induced even after establishing skin sensitization. <b><i>Conclusion:</i></b> Skin sensitization temporarily exacerbated food allergy by enhancing systemic Th2 responses. These findings will help identify the mechanisms involved in food allergy and help develop treatments.

Anti-allergenic effects of peanut sprouts extract in a systemic anaphylaxis food allergy mouse model

2019 ◽  
Author(s):  
WK Yang ◽  
DS Kim ◽  
E Son ◽  
YM Lee ◽  
DS Lee ◽  
...  
Keyword(s):  
Food Allergy ◽  
Mouse Model ◽  
Systemic Anaphylaxis

scholarly journals Differences in TCR repertoire and T cell activation underlie the divergent outcomes of antitumor immune responses in tumor-eradicating versus tumor-progressing hosts

2021 ◽  
Vol 9 (1) ◽  
pp. e001615
Author(s):  
Rachel A Woolaver ◽  
Xiaoguang Wang ◽  
Alexandra L Krinsky ◽  
Brittany C Waschke ◽  
Samantha M Y Chen ◽  
...  
Keyword(s):  
T Cell ◽  
Mouse Model ◽  
Immune Responses ◽  
Single Cell ◽  
T Cell Activation ◽  
Antitumor Immunity ◽  
Cell Activation ◽  
Tcr Repertoire ◽  
Underlying Mechanisms ◽  
Personalized Cancer

BackgroundAntitumor immunity is highly heterogeneous between individuals; however, underlying mechanisms remain elusive, despite their potential to improve personalized cancer immunotherapy. Head and neck squamous cell carcinomas (HNSCCs) vary significantly in immune infiltration and therapeutic responses between patients, demanding a mouse model with appropriate heterogeneity to investigate mechanistic differences.MethodsWe developed a unique HNSCC mouse model to investigate underlying mechanisms of heterogeneous antitumor immunity. This model system may provide a better control for tumor-intrinsic and host-genetic variables, thereby uncovering the contribution of the adaptive immunity to tumor eradication. We employed single-cell T-cell receptor (TCR) sequencing coupled with single-cell RNA sequencing to identify the difference in TCR repertoire of CD8 tumor-infiltrating lymphocytes (TILs) and the unique activation states linked with different TCR clonotypes.ResultsWe discovered that genetically identical wild-type recipient mice responded heterogeneously to the same squamous cell carcinoma tumors orthotopically transplanted into the buccal mucosa. While tumors initially grew in 100% of recipients and most developed aggressive tumors, ~25% of recipients reproducibly eradicated tumors without intervention. Heterogeneous antitumor responses were dependent on CD8 T cells. Consistently, CD8 TILs in regressing tumors were significantly increased and more activated. Single-cell TCR-sequencing revealed that CD8 TILs from both growing and regressing tumors displayed evidence of clonal expansion compared with splenic controls. However, top TCR clonotypes and TCR specificity groups appear to be mutually exclusive between regressing and growing TILs. Furthermore, many TCRα/TCRβ sequences only occur in one recipient. By coupling single-cell transcriptomic analysis with unique TCR clonotypes, we found that top TCR clonotypes clustered in distinct activation states in regressing versus growing TILs. Intriguingly, the few TCR clonotypes shared between regressors and progressors differed greatly in their activation states, suggesting a more dominant influence from tumor microenvironment than TCR itself on T cell activation status.ConclusionsWe reveal that intrinsic differences in the TCR repertoire of TILs and their different transcriptional trajectories may underlie the heterogeneous antitumor immune responses in different hosts. We suggest that antitumor immune responses are highly individualized and different hosts employ different TCR specificities against the same tumors, which may have important implications for developing personalized cancer immunotherapy.

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