Galectins in Host Defense Against Microbial Infections

Area of Science:

• Immunology
• Microbiology
• Glycobiology

Background:

• Galectins are a family of proteins characterized by their affinity for beta-galactoside glycans.
• They are expressed in various cell types, including immune cells, and can function intracellularly or be secreted.
• Galectins play significant roles in both innate and adaptive immunity.

Purpose of the Study:

• To review the functions of endogenous galectins during infections caused by bacteria, fungi, viruses, and parasites.
• To highlight the involvement of galectins in pathogen recognition and immune responses.
• To consolidate current knowledge on galectin roles in host defense against diverse microbial agents.

Main Methods:

• Literature review of studies on galectin functions in microbial infections.
• Analysis of research involving galectin-knockout models for parasitic infections.
• Examination of experimental data on galectin modulation of immune cell functions and host responses.

Main Results:

• Extracellular galectins exhibit bacteriostatic effects and influence antibacterial autophagy.
• Galectin-3 modulates fungal burdens, immune responses, and mortality in fungal infections.
• Galectins-1 and -3 impact viral replication, transmission, and inflammation in viral infections.
• Galectins are crucial in regulating T helper immune responses during parasitic infections.

Conclusions:

• Endogenous galectins are critical regulators of host defense across a spectrum of microbial infections.
• Targeting galectin functions presents potential therapeutic strategies for infectious diseases.
• Further research into galectin-glycan interactions can elucidate novel mechanisms of immunity.