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Abdelmawgood IA, Kotb MA, Ashry H, Ebeed BW, Mahana NA, Mohamed AS, Eid JI, Ramadan MA, Rabie NS, Mohamed MY, Saed NT, Yasser N, Essam D, Zaki YY, Saeed S, Mahmoud A, Eladawy MM, Badr AM. β-glucan mitigates ovalbumin-induced airway inflammation by preventing oxidative stress and CD8 + T cell infiltration. Int Immunopharmacol 2024; 132:111985. [PMID: 38603862 DOI: 10.1016/j.intimp.2024.111985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 03/19/2024] [Accepted: 03/28/2024] [Indexed: 04/13/2024]
Abstract
BACKGROUND Bronchial asthma is a severe respiratory condition characterized by airway inflammation, remodeling, and oxidative stress. β-Glucan (BG) is a polysaccharide found in fungal cell walls with powerful immunomodulatory properties. This study examined and clarified the mechanisms behind BG's ameliorativeactivitiesin an allergic asthma animal model. METHOD BG was extracted from Chaga mushroom and characterized using FT-IR, UV-visible, zeta potential, and 1H NMR analysis. The mice were divided into five groups, including control, untreated asthmatic, dexamethasone (Dexa)-treated (1 mg/kg), and BG (30 and 100 mg/kg)-treated groups. RESULTS BG treatment reduced nasal scratching behavior, airway-infiltrating inflammatory cells, and serum levels of IgE significantly. Additionally, BG attenuated oxidative stress biomarkers by lowering malonaldehyde (MDA) concentrations and increasing the levels of reduced glutathione (GSH), glutathione peroxidase (GPx), and catalase (CAT). Immunohistochemical and flow cytometric analyses have confirmed the suppressive effect of BG on the percentage of airway-infiltrating cytotoxic CD8+ T cells. CONCLUSION The findings revealed the role of CD8+ T cells in the pathogenesis of asthma and the role of BG as a potential therapeutic agent for asthma management through the suppression of airway inflammation and oxidative stress.
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Affiliation(s)
| | - Mohamed A Kotb
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Hamid Ashry
- Biochemistry Branch, Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Bassam W Ebeed
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Noha A Mahana
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | | | - Jehane I Eid
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Marwa A Ramadan
- Department of Laser Application in Metrology, Photochemistry, and Agriculture National Institute of Laser-Enhanced Science (NILES), Cairo University, Giza, Egypt
| | - Nahla S Rabie
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Mariam Y Mohamed
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Nermeen Th Saed
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Nada Yasser
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Dina Essam
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Youssef Y Zaki
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Samar Saeed
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Asmaa Mahmoud
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Marwan M Eladawy
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
| | - Abeer Mahmoud Badr
- Zoology Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
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Ahmad I, Nadeem A, Mushtaq F, Zlatkov N, Shahzad M, Zavialov AV, Wai SN, Uhlin BE. Csu pili dependent biofilm formation and virulence of Acinetobacter baumannii. NPJ Biofilms Microbiomes 2023; 9:101. [PMID: 38097635 PMCID: PMC10721868 DOI: 10.1038/s41522-023-00465-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 11/23/2023] [Indexed: 12/17/2023] Open
Abstract
Acinetobacter baumannii has emerged as one of the most common extensive drug-resistant nosocomial bacterial pathogens. Not only can the bacteria survive in hospital settings for long periods, but they are also able to resist adverse conditions. However, underlying regulatory mechanisms that allow A. baumannii to cope with these conditions and mediate its virulence are poorly understood. Here, we show that bi-stable expression of the Csu pili, along with the production of poly-N-acetyl glucosamine, regulates the formation of Mountain-like biofilm-patches on glass surfaces to protect bacteria from the bactericidal effect of colistin. Csu pilus assembly is found to be an essential component of mature biofilms formed on glass surfaces and of pellicles. By using several microscopic techniques, we show that clinical isolates of A. baumannii carrying abundant Csu pili mediate adherence to epithelial cells. In addition, Csu pili suppressed surface-associated motility but enhanced colonization of bacteria into the lungs, spleen, and liver in a mouse model of systemic infection. The screening of c-di-GMP metabolizing protein mutants of A. baumannii 17978 for the capability to adhere to epithelial cells led us to identify GGDEF/EAL protein AIS_2337, here denoted PdeB, as a major regulator of Csu pili-mediated virulence and biofilm formation. Moreover, PdeB was found to be involved in the type IV pili-regulated robustness of surface-associated motility. Our findings suggest that the Csu pilus is not only a functional component of mature A. baumannii biofilms but also a major virulence factor promoting the initiation of disease progression by mediating bacterial adherence to epithelial cells.
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Affiliation(s)
- Irfan Ahmad
- Department of Molecular Biology and Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187, Umeå, Sweden.
- Institute of Biomedical and Allied Health Sciences, University of Health Sciences, Lahore, Pakistan.
| | - Aftab Nadeem
- Department of Molecular Biology and Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187, Umeå, Sweden
| | - Fizza Mushtaq
- Department of Molecular Biology and Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187, Umeå, Sweden
- Institute of Biomedical and Allied Health Sciences, University of Health Sciences, Lahore, Pakistan
| | - Nikola Zlatkov
- Department of Molecular Biology and Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187, Umeå, Sweden
| | - Muhammad Shahzad
- Department of Pharmacology, University of Health Sciences, Lahore, Pakistan
| | - Anton V Zavialov
- Department of Biochemistry, University of Turku, Tykistökatu 6A, 20520, Turku, Finland
| | - Sun Nyunt Wai
- Department of Molecular Biology and Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187, Umeå, Sweden
- The Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå University, SE-90187, Umeå, Sweden
| | - Bernt Eric Uhlin
- Department of Molecular Biology and Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187, Umeå, Sweden
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Dębińska A, Sozańska B. Dietary Polyphenols-Natural Bioactive Compounds with Potential for Preventing and Treating Some Allergic Conditions. Nutrients 2023; 15:4823. [PMID: 38004216 PMCID: PMC10674996 DOI: 10.3390/nu15224823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/14/2023] [Accepted: 11/15/2023] [Indexed: 11/26/2023] Open
Abstract
In light of the constantly increasing prevalence of allergic diseases, changes in dietary patterns have been suggested as a plausible environmental explanation for the development and progression of these diseases. Nowadays, much attention has been paid to the development of dietary interventions using natural substances with anti-allergy activities. In this respect, dietary polyphenols have been studied extensively as one of the most prominent natural bioactive compounds with well-documented anti-inflammatory, antioxidant, and immunomodulatory properties. This review aims to discuss the mechanisms underlying the potential anti-allergic actions of polyphenols related to their ability to reduce protein allergenicity, regulate immune response, and gut microbiome modification; however, these issues need to be elucidated in detail. This paper reviews the current evidence from experimental and clinical studies confirming that various polyphenols such as quercetin, curcumin, resveratrol, catechins, and many others could attenuate allergic inflammation, alleviate the symptoms of food allergy, asthma, and allergic rhinitis, and prevent the development of allergic immune response. Conclusively, dietary polyphenols are endowed with great anti-allergic potential and therefore could be used either for preventive approaches or therapeutic interventions in relation to allergic diseases. Limitations in studying and widespread use of polyphenols as well as future research directions are also discussed.
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Affiliation(s)
- Anna Dębińska
- Department and Clinic of Paediatrics, Allergology and Cardiology, Wrocław Medical University, ul. Chałubińskiego 2a, 50-368 Wrocław, Poland;
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