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Mimicking microbial strategies for the design of mucus-permeating nanoparticles for oral immunization
Carlos Gamazo1, Nekane Martín-Arbella2, Ana Brotons2
1Department of Microbiology, University of Navarra, Pamplona, Spain.
Abstract:
Dealing with mucosal delivery systems means dealing with mucus. The name mucosa comes from mucus, a dense fluid enriched in glycoproteins, such as mucin, which main function is to protect the delicate mucosal epithelium. Mucus provides a barrier against physiological chemical and physical aggressors (i.e., host secreted digestive products such as bile acids and enzymes, food particles) but also against the potentially noxious microbiota and their products. Intestinal mucosa covers 400m(2) in the human host, and, as a consequence, is the major portal of entry of the majority of known pathogens. But, in turn, some microorganisms have evolved many different approaches to circumvent this barrier, a direct consequence of natural co-evolution. The understanding of these mechanisms (known as virulence factors) used to interact and/or disrupt mucosal barriers should instruct us to a rational design of nanoparticulate delivery systems intended for oral vaccination and immunotherapy. This review deals with this mimetic approach to obtain nanocarriers capable to reach the epithelial cells after oral delivery and, in parallel, induce strong and long-lasting immune and protective responses.
Insights
Understanding mucus and microbial virulence factors informs the design of novel nanocarriers for oral vaccination. This approach aims to improve drug delivery and immune responses at mucosal surfaces.
Area of Science:
- Biomedical Engineering
- Immunology
- Materials Science
Background:
- Mucus, a glycoprotein-rich fluid, forms a protective barrier on mucosal surfaces, shielding against pathogens and environmental aggressors.
- The intestinal mucosa, a vast surface area, is a primary entry point for pathogens, necessitating robust defense mechanisms.
- Microorganisms have evolved sophisticated virulence factors to overcome these mucosal barriers, a product of natural co-evolution.
Purpose of the Study:
- To review the mimetic approach for designing nanoparticulate delivery systems inspired by microbial strategies.
- To explore how understanding virulence factors can guide the development of oral nanocarriers for vaccination and immunotherapy.
- To achieve efficient epithelial cell targeting and elicit potent, durable immune responses.
Main Methods:
- Literature review focusing on mucosal barriers, mucus structure, and microbial virulence factors.
- Analysis of pathogen strategies for interacting with and disrupting mucosal barriers.
- Conceptual design of nanocarriers mimicking these microbial mechanisms for enhanced oral delivery.
Main Results:
- Identification of key microbial virulence factors and their interactions with mucosal barriers.
- Elucidation of how these mechanisms can be mimicked for nanocarrier design.
- Proposal of a rational design strategy for oral nanocarriers capable of targeting epithelial cells.
Conclusions:
- Mimicking microbial virulence factors offers a promising strategy for developing advanced mucosal delivery systems.
- Nanocarriers designed through this approach can potentially enhance oral vaccination and immunotherapy efficacy.
- Further research in this area could lead to improved treatments and protective strategies for mucosal diseases.
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