Coupling pathogen recognition to innate immunity through glycan-dependent mechanisms.

Area of Science:

• Immunology
• Glycobiology
• Microbiology

Background:

• Innate immune cells use pattern recognition receptors (PRRs) to detect microbial pathogens via pathogen-associated molecular patterns (PAMPs).
• While Toll-like receptors (TLRs) are known PRRs, lectin-glycan interactions also play a key role in microbial sensing and immune activation.
• Endogenous damage-associated molecular patterns (DAMPs) are also recognized by PRRs.

Purpose of the Study:

• To discuss the role of glycans and lectins, especially galectins, in microbial recognition and innate immune responses.
• To explore how host and microbial glycans are decoded by endogenous lectins.
• To highlight the potential of galectins as mediators and virulence factors in infection.

Main Methods:

• Review of existing literature on lectin-glycan interactions in immunity.
• Discussion of the mechanisms by which C-type lectins, siglecs, and galectins recognize glycans.
• Analysis of the role of galectins in different stages of infection.

Main Results:

• Galectins act as soluble mediators, bridging microbial and host glycans to modulate immune responses.
• C-type lectins and siglecs recognize microbial glycans on innate immune cell surfaces.
• Galectin-like domains in pathogens suggest their role as virulence factors.

Conclusions:

• Lectin-glycan interactions are central to innate immune recognition of microbes.
• Galectins play multifaceted roles in infection, from recognition to influencing disease outcome.
• Targeting lectin-glycan interactions and PAMP glycosylation may offer novel therapeutic strategies.