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The grass carp (Ctenopharyngodon idella) aquaculture industry in Asia is prone to bacterial and viral hemorrhagic diseases. Effective adjuvants for vaccine formulation are the need of the hour for control of these diseases and long-term sustainability of grass carp farming. In this study, the involvement of interleukin-12 (IL-12) from grass carp (gcIL‑12) in anti-bacterial and anti-viral immune responses was demonstrated via expression profiles of gcIL-12 subunits in immune tissues of the fish, following infection by Aeromonas hydrophila and Aquareovirus. Additionally, cDNA of the gcIL-12 subunits, p35 and p40 was cloned and characterized. We found that most of the structurally and functionally important features of vertebrate orthologues were conserved in gcIL-12 subunits, p35 and p40, with some features specific to grass carp. High levels of gcIL-12 p35 expression in the brain and gills suggest that IL-12 plays an important role in neural and immune systems. High expression levels in the heart, blood, and immune-related tissues suggest an important role in circulation and the immune system as well. Infections by both, A. hydrophila and Aquareovirus stimulated the mRNA expression of gcIL-12 subunits, p35 and p40 in most immune tissues. Significant upregulation or downregulation of gcIL-12 subunits, p35 and p40 by bacterial and viral infection confirms their potential role in anti-bacterial and anti-viral immune responses in fish.

genetics and molecular research

Differential expression of interleukin-12 p35 and p40 subunits in response to Aeromonas hydrophila and Aquareovirus infection in grass carp, Ctenopharyngodon idella