1
|
Xu W, Song X, Qu Q, Gong Z, Xiao W. Synergistic effects of L-theanine and epigallocatechin gallate in alleviating ovalbumin allergy by regulating intestinal immunity through inhibition of mast cell degranulation. Food Funct 2023; 14:2059-2073. [PMID: 36727615 DOI: 10.1039/d2fo03404b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Ovalbumin (OVA), a commonly consumed food protein, can cause severe allergies and intestinal immune disorders. L-Theanine (LTA) and epigallocatechin gallate (EGCG) regulate intestinal immunity. However, it is unclear whether an LTA and EGCG combined intervention can alleviate OVA allergy (OVA-A) by modulating intestinal-specific immunity, and it is unknown whether there is a synergistic effect between LTA and EGCG. Therefore, we treated BALB/c OVA-sensitized mice with LTA, EGCG, or a combination of both (LTA + EGCG) to investigate the effects of LTA and EGCG on intestinal-specific immunity regulation and underlying mechanisms. Female mice were intraperitoneally injected with OVA to establish OVA-sensitive mouse models. MLEO LTA + EGCG (20 mg kg-1 d-1 LTA + 80 mg kg-1 d-1 EGCG) and HLEO (30 mg kg-1 d-1 LTA + 120 mg kg-1 d-1 EGCG) exerted more beneficial effects on alleviating OVA-A (weight gain, allergy score, jejunum structure, mast cell [MC] degranulation, thymus and spleen indices) than LTA or EGCG alone (p < 0.01). Based on the alleviation of OVA-A by LTA + EGCG, we selected MLEO mice for 16S rDNA, flow cytometry, and western blot analyses. The 16S rDNA results showed that MLEO increased the abundance of Lactobacillaceae, Lachnospiraceae, and Ruminococcaceae, and decreased that of Helicobacteraceae (p < 0.01). The flow cytometry and western blotting results indicated that MLEO reduced the number of dendritic cells available to capture OVA, thereby lowering the Th2 immune response and decreasing the IL-4 and IL-13 levels. Meanwhile, the attenuation of the Th2 immune response inhibits the cross-linking of OVA and FcεRI, thus reducing MC degranulation and decreasing the serum HIS and mMCPT-1 levels through the FcεRI/Btk/PLCγ signaling pathway. LTA + EGCG also inhibits the Th2 immune response through the FcεRI/Lyn/Syk/PI3K/AKT signaling pathway and decreases the serum IL-4 and IL-13 levels. Notably, LTA + EGCG promotes the Treg and Th1 immune responses and inhibits the Th17 immune response, altering the levels of the corresponding cytokines. Therefore, LTA + EGCG can synergistically alleviate OVA-A by regulating intestinal immunity through MC degranulation inhibition.
Collapse
Affiliation(s)
- Wei Xu
- Key Lab of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China. .,National Research Center of Engineering Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, China.,Co-Innovation Center of Education Ministry for Utilization of Botanical Functional Ingredients, China.,Hunan Agricultural University, Hunan Collaborative Innovation Center for Utilization of Botanical Functional Ingredients, Changsha, Hunan 410128, China
| | - Xianying Song
- Key Lab of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China. .,National Research Center of Engineering Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, China.,Co-Innovation Center of Education Ministry for Utilization of Botanical Functional Ingredients, China.,Hunan Agricultural University, Hunan Collaborative Innovation Center for Utilization of Botanical Functional Ingredients, Changsha, Hunan 410128, China
| | - Qingyun Qu
- Key Lab of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China. .,National Research Center of Engineering Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, China.,Co-Innovation Center of Education Ministry for Utilization of Botanical Functional Ingredients, China.,Hunan Agricultural University, Hunan Collaborative Innovation Center for Utilization of Botanical Functional Ingredients, Changsha, Hunan 410128, China
| | - Zhihua Gong
- Key Lab of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China. .,National Research Center of Engineering Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, China.,Co-Innovation Center of Education Ministry for Utilization of Botanical Functional Ingredients, China.,Hunan Agricultural University, Hunan Collaborative Innovation Center for Utilization of Botanical Functional Ingredients, Changsha, Hunan 410128, China
| | - Wenjun Xiao
- Key Lab of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China. .,National Research Center of Engineering Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, Hunan 410128, China.,Co-Innovation Center of Education Ministry for Utilization of Botanical Functional Ingredients, China.,Hunan Agricultural University, Hunan Collaborative Innovation Center for Utilization of Botanical Functional Ingredients, Changsha, Hunan 410128, China
| |
Collapse
|
2
|
Azzano P, Dufresne É, Poder T, Bégin P. Economic considerations on the usage of biologics in the allergy clinic. Allergy 2021; 76:191-209. [PMID: 32656802 DOI: 10.1111/all.14494] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 07/04/2020] [Accepted: 07/08/2020] [Indexed: 12/27/2022]
Abstract
The advent of biologic therapies has transformed care for severe atopic disorders but their high cost poses new challenges with regard to long-term sustainability and fair allocation of resources. This article covers the basic concepts of cost-utility analyses and reviews the available literature on cost utility of biologic drugs in atopic disorders. When used within their limits as part of a multi-dimensional assessment, economic analyses can be extremely useful to guide decision-making and prioritization of care. Despite the good quality of most cost-utility analyses conducted for the use of biologics in asthma and other atopic diseases, their conclusions regarding cost-effectiveness are extremely variable. This is mainly due to the use of inconsistent estimates of health utility benefit with therapy. Development of reliable and validated instruments to measure disutility in atopic disorders and measure of indirect costs in atopic disease are identified as a priority for future research.
Collapse
Affiliation(s)
- Pauline Azzano
- Department of Pediatrics CHU Sainte‐Justine Montreal QC Canada
| | - Élise Dufresne
- Department of Pediatrics CHU Sainte‐Justine Montreal QC Canada
| | - Thomas Poder
- Department of Management, Evaluation and Health Policy School of Public Health University of Montreal Montreal QC Canada
- Research Center of the Institut Universitaire en Santé Mentale de Montréal Montreal QC Canada
| | - Philippe Bégin
- Department of Pediatrics CHU Sainte‐Justine Montreal QC Canada
| |
Collapse
|
3
|
Dufresne É, Poder TG, Samaan K, Lacombe‐Barrios J, Paradis L, Des Roches A, Bégin P. SF-6Dv2 preference value set for health utility in food allergy. Allergy 2021; 76:326-338. [PMID: 32533705 DOI: 10.1111/all.14444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/13/2020] [Accepted: 04/13/2020] [Indexed: 01/19/2023]
Abstract
BACKGROUND The lack of a value set allowing the calculation of QALY is an important limitation when establishing the value of emerging therapies to treat food allergy. The aim of this study was to develop a Short-Form Six-Dimension version 2 (SF-6Dv2) preference value set for the calculation of health utility from the Canadian food-allergic population. METHODS Two hundred ninety-five parents of patients aged 0-17 years old and 154 patients aged 12 years old and above with food allergy were recruited in clinic and online. Participants were asked to complete a self-administered online questionnaire including generic health-related quality of life questionnaires. Various health states described by the SF-6Dv2 were valued with time-trade-off and discrete choice experiments. Data from elicitation techniques were combined using the hybrid regression model. RESULTS A total of 241 parents and 125 patients performed 3904 time-trade-off and 5112 discrete choice experiments. Utility decrements were estimated for each level of each SF-6Dv2 dimension. Utility values calculated based on the validated preference set were in average 0.15 lower (95%CI: 0.12-0.18) and were poorly correlated (R2 = 0.46) with those derived from the EQ-5D-5L generic questionnaire in the same cohort. CONCLUSION A representative preference value set for patients with food allergy was determined using the SF-6Dv2 generic questionnaire. This adapted preference set will contribute to improve the validity of future utility estimates in this population for the appraisal of upcoming potentially impactful but sometimes costly therapies.
Collapse
Affiliation(s)
- Élise Dufresne
- Department of Medicine Université de Montréal Montreal QC Canada
| | - Thomas G. Poder
- Department of Management, Evaluation and Health Policy School of Public Health Université de Montréal Montreal QC Canada
- Research center of the Institut universitaire de santé mentale de Montréal Montreal QC Canada
| | - Kathryn Samaan
- Departement of Pediatrics Centre Hospitalier Universitaire Sainte‐Justine Montreal QC Canada
| | | | - Louis Paradis
- Department of Medicine Université de Montréal Montreal QC Canada
- Departement of Pediatrics Centre Hospitalier Universitaire Sainte‐Justine Montreal QC Canada
| | - Anne Des Roches
- Departement of Pediatrics Centre Hospitalier Universitaire Sainte‐Justine Montreal QC Canada
| | - Philippe Bégin
- Department of Medicine Université de Montréal Montreal QC Canada
- Departement of Pediatrics Centre Hospitalier Universitaire Sainte‐Justine Montreal QC Canada
| |
Collapse
|