Evaluation of NF-kB Gene Expression in liver tissue of Broiler Chickens fed with Silver Nanoparticles as an Indicator of Inflammation Induction in Heat Stress Conditions

Heat stress is one of the most important immunosuppressive factors in poultry industry and heat stress has been associated with increases reactive oxygen species and oxidative stress in cells. Since the nuclear factor kappa-B is known as fast cellular response factor to endogenous stress; this study was conducted to evaluate relative gene expression in broiler chicken with 450 one-day-old Cobb 500 broiler chickens for 42 days. Treatments included: (1) basal diet (control), (2) basal diet containing 1% zeolite, (3) basal diet containing 1% of zeolite-coated with 0.5% silver nanoparticles, (4) Basal diet containing with 0.15% organic acids and (5) Basal diet containing 1% of zeolite-coated with 0.5% of silver nanoparticles and 0.15% organic acids in with or without heat stress condition. Liver biopsy was done in 21st and 42nd days of experiment. Results demonstrated the level of nuclear factor kappa-B relative gene expression in the 21st and 42nd days of experiment with heat stress condition in zeolite treatment and 42nd days of experiment without heat stress condition in silver nanoparticles coated with zeolite in combination with organic acid in broiler liver was significant increase expression comparison with control and all treatments (P<0.05). In conclusion results showed that zeolite and silver nanoparticles identified as an inorganic, chemical and exogenous substances in body tissues and liver identified this substances as a xenobiotics and up-regulated expression of index genes in oxidative stress pathways and inflammation. Whereas this effect is not identified in organic acid.