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Functional characterization of mannose-binding lectin in zebrafish: implication for a lectin-dependent complement
Lili Yang1, Lingzhen Bu1, Weiwei Sun1
1Laboratory for Evolution & Development, Institute of Evolution & Marine Biodiversity and Department of Marine Biology, Ocean University of China, China.
Developmental and Comparative Immunology
|May 27, 2014
Summary
Zebrafish embryos possess mannose-binding lectin (MBL), crucial for early immune defense. This lectin pathway protects developing zebrafish from bacterial infections before their adaptive immunity matures.
Area of Science:
- Immunology
- Developmental Biology
- Aquatic Biology
Background:
- The lectin pathway, initiated by mannose-binding lectin (MBL), recognizes pathogens and activates immune responses.
- MBL's role in early development and innate immunity is crucial but not fully understood in all species.
Purpose of the Study:
- To investigate the presence and function of MBL in early zebrafish development.
- To determine if the lectin pathway provides immune protection in zebrafish embryos.
Main Methods:
- Detected MBL gene transcript and protein in zebrafish embryos.
- Tested recombinant zebrafish MBL's binding and opsonization capabilities against bacteria.
- Administered anti-MBL antibodies and recombinant MBL to zebrafish embryos challenged with Aeromonas hydrophila.
Main Results:
- Zebrafish MBL binds Gram-negative and Gram-positive bacteria and promotes phagocytosis.
- Blocking MBL function increased embryo mortality when infected with A. hydrophila.
- Supplementing MBL enhanced embryo resistance to A. hydrophila infection.
Conclusions:
- The lectin pathway is functional in early zebrafish embryos, providing innate immune protection.
- Zebrafish MBL plays a vital role in protecting developing embryos from microbial infections.
