Abstract
The induction of Hsps (heat shock protein) recognized as a promising approach to limiting disease and improving health in aquaculture. This investigation aimed to study the impacts of Pro‐Tex®, an extract from the prickly pear cactus (Opuntia ficus indica), on the expression of Hsp70 gene and induction of immune response parameters in Acipenser persicus infected with Aeromonas hydrophila ATCC®7966ᵀᴹ. Fish were pretreated with 25, 50 and 100 mg/L of Pro‐Tex and then injected in the intra‐peritoneal cavity with A. hydrophila. The expression level of Hsp70 gene, lysozyme activity (LYZ) and complement C3 (C3), and immunoglobulin M (IgM) levels were assessed in liver, gill, and intestine on the days 3 and 7 post‐infection. Tex‐OE® increased expression of Hsp70 in a dose‐dependent way in A. persicus, but this expression significantly reduced on the 7‐days post‐injection. The Hsp70 expression pattern was variable in each tissue, also, LYZ activity, C3, and IgM increased, depending on the concentration, and showed a decreasing trend in a time‐dependent way. In conclusion, our data indicated that Pro‐Tex as an Hsp70 inducer increases the resistance of sturgeon fry against fish pathogens by induction of different immunity factors.
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