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Intra-lymph Node Injection of Biodegradable Polymer Particles
Published on: January 2, 2014
Biodegradable microspheres. III: some immunological properties of polyacryl starch microparticles
Abstract:
The antibody responses against empty polyacryl starch microparticles and the corresponding human serum albumin (HSA)-containing microparticles were followed in mice for 30 weeks. Empty polyacryl starch microparticles were nonimmunogenic as determined by a direct, enzyme-linked immunosorbent assay (ELISA). However, when the previously nonimmunogenic particle matrix was presented to the immune system together with entrapped HSA, an antibody response was detected not only against the protein antigen, but also against the microparticles matrix as detected in an inhibition ELISA. The spheres were good adjuvants for the foreign protein (HSA) and gave nearly the same response as that obtained with Freund's complete adjuvant (FCA), while the corresponding free antigen showed no or poor immunogenicity. The effects of the microparticles on lymphocytes and macrophages were also investigated. Empty microspheres were weakly stimulatory to lymphocytes. Moreover, they stimulated macrophages to release interleukin 1 in vitro.
Insights
Polyacryl starch microparticles, initially nonimmunogenic, elicited antibody responses against both entrapped human serum albumin (HSA) and the particle matrix itself when co-administered. These microparticles also demonstrated adjuvant properties, enhancing immune responses to HSA.
Area of Science:
- Immunology
- Materials Science
Background:
- Polyacryl starch microparticles are novel drug delivery systems.
- Understanding their immunogenicity and adjuvant properties is crucial for therapeutic applications.
Purpose of the Study:
- To investigate the antibody responses to empty and human serum albumin (HSA)-loaded polyacryl starch microparticles in mice.
- To evaluate the adjuvant effect of these microparticles on immune responses to HSA.
- To assess the impact of microparticles on immune cells like lymphocytes and macrophages.
Main Methods:
- Antibody responses were measured using direct and inhibition enzyme-linked immunosorbent assays (ELISA) over 30 weeks.
- Adjuvant efficacy was compared to Freund's complete adjuvant (FCA).
- In vitro studies assessed the effects on lymphocytes and macrophage-derived interleukin-1.
Main Results:
- Empty microparticles were nonimmunogenic.
- HSA-loaded microparticles induced antibodies against both HSA and the particle matrix.
- Microparticles acted as effective adjuvants for HSA, comparable to FCA.
- Empty microspheres showed weak lymphocyte stimulation and induced interleukin-1 release from macrophages.
Conclusions:
- Polyacryl starch microparticles can elicit immune responses against themselves when loaded with antigen.
- These microparticles possess significant adjuvant activity, enhancing immune responses to co-administered antigens.
- The microparticles interact with immune cells, suggesting a role in modulating immune responses.
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