Fucoidan is a class of acidic polysaccharides widely found in the cell walls of brown algae, with diverse biological activities such as antiviral, hypoglycemic, and intestinal microecological improvement. Its sulfation site and form affect its antiviral activity. Therefore, CD BioGlyco has proposed a fucoidan vaccine development program based on the characterization of its antiviral activity, which also includes the modification of fucoidan acidification sites.
Firstly, we prepare fucoidan with different sulfation site modifications by adopting a regioselective protection strategy using the microbial-assisted ring-opening polymerization reaction technique. The molecular weights and dispersion coefficients are determined by gel permeation chromatography (GPC).
The antiviral activity of fucoidan and its analogs depends on their sulfation site and form. Therefore, we test their antiviral activity. We chose a specific virus and incubated fucoidan with different sulfation sites together with the viral sting proteins to determine the binding inhibitory activity of fucoidan against the virus.
Fucoidan is tested for its antiviral activity and has been found to stimulate the host's natural immune system. Therefore, we develop antiviral or antitumor vaccines using it as an adjuvant targeting pattern recognition receptor types.
We provide in vivo experiments to evaluate the effectiveness of the vaccine: the vaccine containing different concentrations of fucoidan will be injected into mice, and under the same conditions, we compare the activity of viruses and tumor cells in the mice to obtain the effectiveness of the vaccine.
Fig.1 Development process of fucoidan-based vaccine. (CD BioGlyco)
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