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Specific attachment of aqueous-based microcapsules to macrophages, B cells, and dendritic cells in vitro
J O Brubaker1, K K Macartney, T J Speaker
1Division of Immunologic and Infectious Diseases, The Children's Hospital of Philadelphia, and The University of Pennsylvania School of Medicine, 19104, USA.
Abstract:
Microcapsules were previously prepared composed of aqueous anionic polymers (e.g. alginate) and aqueous amines (e.g. spermine) and it was found that the aqueous-based microcapsules enhanced rotavirus-specific immune responses after oral or parenteral immunization of mice. In these studies, one has modified the amine moiety of aqueous-based microcapsules to bind covalently to avidin and the avidin-bearing microcapsules were linked to biotinylated antibodies specific for surface markers on murine macrophages, dendritic cells, or B cells. Using fluorescence flow cytometry, it was found that antibody-coated microcapsules bound specifically to antigen-presenting cells (APC) in vitro. The availability of APC-specific microcapsules should allow for the uptake of antigens by specific APC, and further one's understanding of the relative capacities of different APC to induce antigen-specific immune responses.
Insights
Modified microcapsules specifically target antigen-presenting cells (APCs), enhancing antigen uptake and improving understanding of immune responses. This advance aids in developing targeted immunotherapies.
Area of Science:
- Immunology
- Materials Science
- Nanotechnology
Background:
- Aqueous-based microcapsules previously enhanced rotavirus-specific immune responses.
- Modifications aimed to improve targeted delivery of antigens.
Purpose of the Study:
- To develop antigen-presenting cell (APC)-specific microcapsules.
- To investigate the binding of modified microcapsules to APCs in vitro.
- To explore the potential for enhanced antigen uptake by specific APCs.
Main Methods:
- Aqueous-based microcapsules were modified to covalently bind avidin.
- Avidin-bearing microcapsules were linked to biotinylated antibodies targeting murine macrophage, dendritic cell, or B cell surface markers.
- Fluorescence flow cytometry was used to assess microcapsule binding to APCs.
Main Results:
- Antibody-coated microcapsules demonstrated specific binding to APCs in vitro.
- The modified microcapsules successfully targeted specific immune cells.
Conclusions:
- APC-specific microcapsules facilitate targeted antigen delivery.
- This approach enhances understanding of APC-mediated antigen-specific immune responses.
- The findings support the development of novel targeted immunotherapy strategies.
