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Evolution of the lectin-complement pathway and its role in innate immunity
1Department of Biochemistry, Fukushima Medical University School of Medicine, Japan. tfujita@fmu.ac.jp
Nature Reviews. Immunology
|May 30, 2002
Summary
Lectins, crucial for innate immunity, distinguish self from non-self. A similar lectin-based complement system in ascidians suggests this system predates adaptive immunity in vertebrates.
Area of Science:
- Immunology
- Evolutionary Biology
- Biochemistry
Background:
- Innate immunity relies on lectins (carbohydrate-binding proteins) for self/non-self discrimination.
- Vertebrate immune recognition involves ficolins and mannose-binding lectins, activating the complement system.
- The complement system activates serine proteases for immune responses.
Purpose of the Study:
- To investigate the presence and role of a lectin-based complement system in ascidians.
- To understand the evolutionary origins of the complement system in innate immunity.
Main Methods:
- Comparative analysis of immune recognition mechanisms.
- Study of lectin function and complement activation pathways in ascidians.
Main Results:
- Ascidians possess a lectin-based complement system similar to vertebrates.
- This system involves ficolin-like proteins and triggers complement activation.
Conclusions:
- The complement system likely played a key role in innate immunity before the evolution of adaptive immunity.
- Ascidians provide insights into the early evolution of immune systems.