Structure-function relationships of immunostimulatory polysaccharides: A review

Area of Science:

• Immunology
• Carbohydrate Chemistry
• Food Science

Background:

• Immunostimulatory polysaccharides interact with the immune system to enhance host responses.
• Various polysaccharides like glucans, mannans, and fucoidans exhibit reported immunostimulatory activity.
• Key structural features influencing activity include monosaccharide composition, linkage types, conformation, molecular weight, functional groups, and branching.

Purpose of the Study:

• To define structure-function relationships for designing effective immunostimulatory polysaccharides.
• To explore applications in preventive/therapeutic strategies and functional foods.
• To provide a literature survey on polysaccharide structures and their immunostimulatory effects.

Main Methods:

• Literature review of scientific publications on immunostimulatory polysaccharides.
• Analysis of reported structural features and associated immune activities.
• Introduction to fundamental immunological concepts relevant to polysaccharide activity.

Main Results:

• Identified specific monosaccharide and glycosidic-linkage compositions, conformation, molecular weight, functional groups, and branching as critical structural determinants.
• Highlighted the necessity of using purified, characterized polysaccharides and performing selective structural modifications to establish definitive structure-function relationships.
• Compiled a survey of various polysaccharides and their documented immunostimulatory effects.

Conclusions:

• Establishing precise structure-function relationships is crucial for the rational design of immunostimulatory polysaccharides.
• Further research using purified and modified polysaccharides is needed to fully elucidate their immune-modulating mechanisms.
• Immunostimulatory polysaccharides hold significant potential for therapeutic applications and as health-promoting ingredients in functional foods.