Mannan-binding lectin (MBL) in chickens: molecular and functional aspects

Area of Science:

• Immunology
• Biochemistry
• Comparative Biology

Background:

• Mannan-binding lectin (MBL) is a crucial serum collectin in innate immune defense.
• MBL binds microbial surfaces via carbohydrate recognition domains, initiating opsonization or complement activation.
• MBL-associated serine proteases (MASP-1, MASP-2) are integral to MBL's function.

Purpose of the Study:

• To review current knowledge of MBL in chickens (Aves).
• To compare avian MBL with MBL found in mammals.
• To highlight similarities and differences in MBL structure and function across species.

Main Methods:

• Literature review of MBL research in chickens and mammals.
• Comparative analysis of MBL forms and functions.
• Synthesis of existing in vitro and in vivo study findings.

Main Results:

• Chickens possess a single form of MBL, analogous to humans.
• Rodents (mice, rats) exhibit two distinct MBL forms in their serum.
• Avian MBL shares functional mechanisms with mammalian MBL, including microbial recognition and complement activation.

Conclusions:

• Chicken MBL plays a significant role in innate immunity, similar to its mammalian counterpart.
• The presence of a single MBL form in chickens and humans warrants further investigation into evolutionary adaptations.
• Understanding avian MBL provides insights into the broader evolutionary and functional diversity of this immune molecule.