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Antigens Involved in Adaptive Immunity

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...

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Starch-based NP act as antigen delivery systems without immunomodulating effect.

François Fasquelle¹, Laurent Dubuquoy², Didier Betbeder¹

¹Vaxinano, Loos, France.

|July 29, 2022

Summary

This summary is machine-generated.

Nasal immunization with starch nanoparticles (NPL) enhances antigen delivery without causing inflammation. This efficient delivery system alone is sufficient for inducing mucosal immunity, negating the need for immunomodulators.

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Area of Science:

Immunology
Nanotechnology
Cell Biology

Background:

Nasal immunization offers an alternative to injections, inducing both mucosal and systemic immunity.
Immunomodulators can enhance immune responses but may cause inflammation, limiting their use.
Starch nanoparticles (NPL) are investigated as delivery systems for nasal vaccines.

Purpose of the Study:

To investigate the mechanisms by which starch nanoparticles (NPL) enhance antigen immunogenicity in H292 epithelial cells.
To assess the immunomodulatory effects of NPL.
To determine if NPL can induce mucosal immunity without additional immunomodulators.

Main Methods:

In vitro study using H292 epithelial cells.
Evaluation of antigen (E. coli lysate) delivery and immunogenicity enhancement by NPL.
Comparison of reticulated (NPL) and non-reticulated (NPL·NR) starch nanoparticles.
Assessment of NPL's intrinsic immunomodulatory effects.

Main Results:

NPL enhanced antigen immunogenicity by increasing intracellular delivery, not through intrinsic immunomodulatory effects.
Particle density significantly influenced NPL efficiency, with reticulated particles showing different efficacy.
NPL demonstrated no inherent immunomodulatory effect on H292 cells.

Conclusions:

Efficient antigen delivery systems, like NPL, can enhance immunogenicity without requiring immunomodulators.
Starch nanoparticles are a promising platform for nasal vaccine development, capable of inducing mucosal immune responses.
The physical properties of nanoparticles, such as density, are critical for optimizing vaccine delivery efficacy.