Document Type : Research Paper
The aim of this study was to evaluate the effects of food supplements Pediococcus acidilactici probiotic and Agaricus bisporus prebiotic separate and together (synbiotics) on the expression of immune-mediated genes (TNF-1α, IL-8 and LYZ-c) in common carp exposed to silver nanoparticles. For this aim, 180 carp with an average weight of 29.6±0.4g were divided into four groups of probiotic, prebiotic, combined and control (feeding with no supplements) and were fed for 8 weeks. After the end of feeding period, the fish were exposed to the concentration of sub-acute nano-silver (1mg/L) for 14 days. Sampling from the intestinal tissue was performed to measure the expression of these genes during days 1, 7 and 14. The expression of TNF-1α gene increased significantly with probiotic and periotic dietary supplementation during increasing days of exposure to nano-silver (P<0.05).The expression level of this gene was increased in the 14 days treatments (1.61) compared to other treatments. Expression of IL-8 and LYZ-c genes was highest on 1st day of exposure. However, on the 7th and 14th days of exposure to the nano-silver, the expression of these two genes decreased significantly (P<0.05). However, in spite of the use of synbiotics supplementation in diet, it was not superior to their separate use. Separate or combined use of P. acidilactici as a probiotic and A. bisporus as a prebiotic in the diet can increase the relative expression of TNF-1α gene in common carp exposed to nanosilver. Also, these supplements did not affect the expression of IL-8 and LYZ-c genes.