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Published on: January 20, 2018
Enhancement of muramyldipeptide (MDP) immunostimulatory activity by controlled multimerization on dendrimers
Nanna S Sorensen1, Ulrik Boas, Peter M H Heegaard
1Innate Immunology Group, National Veterinary Institute, Technical University of Denmark, Copenhagen V, Denmark. nsor@vet.dtu.dk
Abstract:
Peptidoglycan is a widespread bacterial PAMP molecule and a powerful initiator of innate immune responses. It consists of repeating units of MDP, which as a monomer is only weakly immunostimulatory. Here, MDP-coupled dendrimers were prepared and investigated for stimulation of pig blood mononuclear cells. Compared to monomeric MDP, MDP-dendrimers induced a markedly enhanced production of IL-12 p40, IL-1β and IL-6 and completely down-regulated surface expression of B7 and MHC class II. These results suggest a possible novel strategy based on controlled multimerization of minimal PAMP motifs on dendrimers for preparing molecularly defined immunostimulators with predictable bioactivities.
Insights
Dendrimers coupled with minimal PAMP motifs (MDP) significantly boosted innate immune responses in pig cells. This suggests a new strategy for creating molecularly defined immunostimulators with predictable bioactivity.
Area of Science:
- Immunology
- Biochemistry
- Materials Science
Background:
- Peptidoglycan, a bacterial molecule, activates innate immunity.
- Monomeric muramyl dipeptide (MDP) shows weak immunostimulatory effects.
Purpose of the Study:
- To investigate MDP-coupled dendrimers as potent immunostimulators.
- To evaluate the immune response of pig blood mononuclear cells to MDP-dendrimers.
Main Methods:
- Preparation of MDP-coupled dendrimers.
- Stimulation of pig blood mononuclear cells with MDP-dendrimers and monomeric MDP.
- Analysis of cytokine production (IL-12 p40, IL-1β, IL-6) and cell surface marker expression (B7, MHC class II).
Main Results:
- MDP-dendrimers induced significantly higher levels of IL-12 p40, IL-1β, and IL-6 compared to monomeric MDP.
- MDP-dendrimers led to complete downregulation of B7 and MHC class II surface expression.
- Demonstrated enhanced immunostimulatory activity through controlled multimerization of MDP motifs.
Conclusions:
- Controlled multimerization of minimal PAMP motifs on dendrimers offers a novel strategy for developing potent immunostimulators.
- MDP-dendrimers exhibit predictable and enhanced bioactivity for potential immunomodulatory applications.
