Humoral factors of innate immunity in fish
DOI:
https://doi.org/10.33910/2687-1270-2025-6-3-279-294Keywords:
fish immunity, humoral factors, aquaculture, innate immunity, complement system, lysins, lectins, pentraxins, interferons, chemokinesAbstract
The study of humoral factors of innate immunity in bony fish (Teleostei) is of critical importance for advancing national aquaculture. Although fish possess both innate and adaptive immune systems, as do more phylogenetically advanced vertebrates, data from model organisms of other taxonomic classes cannot be directly extrapolated. Poikilothermy in combination with an aquatic environment fundamentally shapes the development and function of all aspects of the teleost immune system. Aquaculture enterprises are invested not only in enhancing productivity but also in sustainable, prophylactic strategies to mitigate the risk of pathological outbreaks. This article details the principal components of nonspecific humoral defense in fish: lysins (including antimicrobial peptides, the complement system, and lysozyme), lectins (such as mannose-binding lectins, calcium-dependent lectins, and pentraxins), transferrin, metallothioneins, interferons, and chemokines. We outline their roles in pathogen defense and the regulation of inflammatory responses. The nonspecific arm constitutes the foundational defense mechanism in teleosts. A comprehensive understanding of these humoral factors is essential for identifying key targets for effective disease prevention in aquaculture.
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