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dos Santos JAA, de Araújo Moura BK, Pérez CD, Cavalcanti IDL, Lira Nogueira MCDB, Ximenes RM, de Aguiar Júnior FCA, Silva Santos NPD. Protective mucus effect of the crude fraction of the mucus produced by the zoanthide Palythoa caribaeorum. Tissue Cell 2022; 79:101957. [DOI: 10.1016/j.tice.2022.101957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 10/10/2022] [Accepted: 10/11/2022] [Indexed: 11/17/2022]
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The properties of the mucus barrier, a unique gel--how can nanoparticles cross it? Ther Deliv 2016; 7:229-44. [PMID: 27010985 DOI: 10.4155/tde-2015-0002] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The key criterion for a nanoparticle drug-delivery system is the ability to produce substantial bioavailability without damaging the physiological protective mechanisms. The main area for drug delivery is the aerodigestive tract. All epithelial surfaces have a membrane-bound layer and in the lung this layer is surmounted by a gel layer. In the gastrointestinal tract the membrane-bound mucin layer is covered by a mucus bilayer. The pore sizes of mucus gels are around 100 to 200 nm. Consequently, only nanoparticles in this size range could potentially penetrate without modification of these layers. To study nanoparticle permeation with results that pertain to in vivo conditions, native mucus mucin preparations must be used. Strategies to increase pores in mucus gels are discussed herein.
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Magalhães A, Rossez Y, Robbe-Masselot C, Maes E, Gomes J, Shevtsova A, Bugaytsova J, Borén T, Reis CA. Muc5ac gastric mucin glycosylation is shaped by FUT2 activity and functionally impacts Helicobacter pylori binding. Sci Rep 2016; 6:25575. [PMID: 27161092 PMCID: PMC4861914 DOI: 10.1038/srep25575] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 04/19/2016] [Indexed: 12/21/2022] Open
Abstract
The gastrointestinal tract is lined by a thick and complex layer of mucus that protects the mucosal epithelium from biochemical and mechanical aggressions. This mucus barrier confers protection against pathogens but also serves as a binding site that supports a sheltered niche of microbial adherence. The carcinogenic bacteria Helicobacter pylori colonize the stomach through binding to host glycans present in the glycocalyx of epithelial cells and extracellular mucus. The secreted MUC5AC mucin is the main component of the gastric mucus layer, and BabA-mediated binding of H. pylori to MUC5AC confers increased risk for overt disease. In this study we unraveled the O-glycosylation profile of Muc5ac from glycoengineered mice models lacking the FUT2 enzyme and therefore mimicking a non-secretor human phenotype. Our results demonstrated that the FUT2 determines the O-glycosylation pattern of Muc5ac, with Fut2 knock-out leading to a marked decrease in α1,2-fucosylated structures and increased expression of the terminal type 1 glycan structure Lewis-a. Importantly, for the first time, we structurally validated the expression of Lewis-a in murine gastric mucosa. Finally, we demonstrated that loss of mucin FUT2-mediated fucosylation impairs gastric mucosal binding of H. pylori BabA adhesin, which is a recognized feature of pathogenicity.
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Affiliation(s)
- Ana Magalhães
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Júlio Amaral de Carvalho, 45, 4200-135 Porto, Portugal
- Institute of Molecular Pathology and Immunology of University of Porto, Ipatimup, Rua Júlio Amaral de Carvalho, 45, 4200-135 Porto, Portugal
| | - Yannick Rossez
- Structural and Functional Glycobiology Unit, UMR CNRS 8576, University of Lille, 59655 Villeneuve d’Ascq, France
| | - Catherine Robbe-Masselot
- Structural and Functional Glycobiology Unit, UMR CNRS 8576, University of Lille, 59655 Villeneuve d’Ascq, France
| | - Emmanuel Maes
- Structural and Functional Glycobiology Unit, UMR CNRS 8576, University of Lille, 59655 Villeneuve d’Ascq, France
| | - Joana Gomes
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Júlio Amaral de Carvalho, 45, 4200-135 Porto, Portugal
- Institute of Molecular Pathology and Immunology of University of Porto, Ipatimup, Rua Júlio Amaral de Carvalho, 45, 4200-135 Porto, Portugal
| | - Anna Shevtsova
- Department of Medical Biochemistry and Biophysics, Umeå University, SE-901 87 Umeå, Sweden
| | - Jeanna Bugaytsova
- Department of Medical Biochemistry and Biophysics, Umeå University, SE-901 87 Umeå, Sweden
| | - Thomas Borén
- Department of Medical Biochemistry and Biophysics, Umeå University, SE-901 87 Umeå, Sweden
| | - Celso A. Reis
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Júlio Amaral de Carvalho, 45, 4200-135 Porto, Portugal
- Institute of Molecular Pathology and Immunology of University of Porto, Ipatimup, Rua Júlio Amaral de Carvalho, 45, 4200-135 Porto, Portugal
- Medical Faculty, University of Porto, Al. Prof. Hernâni Monteiro, 4200–319 Porto, Portugal
- Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), University of Porto, Rua de Jorge Viterbo Ferreira no 228, 4050-313 Porto, Portugal
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