Inhibition of TLR4 and NLRP3 leads to the exacerbation of IgE specific antibodies in mouse allergic models based on subcutaneous or intranasal immunization respectively
- Authors: Chudakov D.B.1, Shustova O.A.1, Konovalova M.V.1, Velichinskii R.A.1, Fattakhova G.V.1
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Affiliations:
- Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
- Issue: Vol 27, No 2 (2024)
- Pages: 219-226
- Section: SHORT COMMUNICATIONS
- URL: https://ogarev-online.ru/1028-7221/article/view/263679
- DOI: https://doi.org/10.46235/1028-7221-16617-IOT
- ID: 263679
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Abstract
A significant increase in the prevalence of diseases linked with IgE production can be seen in recent years, but the question about the role of TLR receptors in this process remains controversial. According to the hygiene hypothesis, the decrease of the contact of the individual with pathogens that contain PRR receptor ligands in the recent years leads to the development of allergic diseases. The aim of this work was to investigate whether TLR4 and NLRP3 receptor activation contributes to allergen-specific antibody formation.
BALB/c mice were immunized according to two different protocols. In the first one, OVA antigen was administered in 0.1 µg dose 2-3 times a week for 6 weeks by subcutaneous route. In the second one, OVA was administered in 0.3 µg dose intranasally in combination with 4 ng of benzo(a)pyrene (BaP) 2 times a week for 8 weeks. In both cases, TLR4 and NLRP3 receptor inhibitors, namely TLR4-IN-C34 in 1 mg/kg dose and CY- 09 in 20 mg/kg dose respectively were also administered to the some of the mice. Specific antibody production was determined by ELISA.
Immunization of mice with TLR4-IN-C34 significantly (p < 0.01) amplify IgE production (about 2.5 times in comparison with control group), but has no effect on specific IgG1 production in subcutaneous model. Specific IgE titers in the control group immunized without small molecule inhibitor and in the TLR4-IN-C34 group were (3±0.6) × 103 and (8±2) × 103, respectively. In this model, CY-09 administration has no effect on humoral immune response. In the secondary (intranasal) model, BaP significantly increase specific IgE and IgG1 production. CY-09 but not TLR4-IN-C34 administered in combination with BaP significant (p < 0.05) and approximately 2 times enhances specific IgE but not IgG1 production. Specific IgE titers in the control group without inhibitor and in the CY-09 group were (2.0±0.4) × 102 and (5.1±0.3) × 102, respectively.
So, PRR-activation, in our case activation of TLR4 in the model based on subcutaneous immunization or NLRP3 in the model based on intranasal antigen administration with BaP suppressed the production of allergen-specific IgE, but not IgG1. These data are in consistent with the hygiene theory of allergy development.
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##article.viewOnOriginalSite##About the authors
D. B. Chudakov
Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Author for correspondence.
Email: boris-chudakov@yandex.ru
PhD (Biology), Research Associate, Laboratory of Cell Interactions
Russian Federation, MoscowO. A. Shustova
Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Email: boris-chudakov@yandex.ru
PhD (Biology), Junior Research Associate, Laboratory of Cell Interactions
Russian Federation, MoscowM. V. Konovalova
Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Email: boris-chudakov@yandex.ru
PhD (Biology), Research Associate, Laboratory of Cell Interactions
Russian Federation, MoscowR. A. Velichinskii
Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Email: boris-chudakov@yandex.ru
Research Engineer, Laboratory of Cell Interactions
Russian Federation, MoscowG. V. Fattakhova
Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences
Email: boris-chudakov@yandex.ru
PhD (Biology), Research Associate, Laboratory of Cell Interactions
Russian Federation, MoscowReferences
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