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Guo Y, Zhang J, Li X, Wu J, Han J, Yang G, Zhang L. Oxidative stress mediated immunosuppression caused by ammonia gas via antioxidant/oxidant imbalance in broilers. Br Poult Sci 2023; 64:36-46. [PMID: 36083210 DOI: 10.1080/00071668.2022.2122025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
1. Ammonia is one of major air pollutants in intensive poultry houses, where it causes immunosuppression in broilers. Although previous studies have focused on a particular organ, data on multiple organs have not been reported.2. In the following work, broilers were exposed to environmental ammonia (0, 10, 20, and 40 mg/m3 from 1-21 d old; and 0, 15, 30, and 60 mg/m3 from 22-42 d old).3. Ammonia exposure reduced bird spleen index at 42 d and thymus index at 14, 28, 35 and 42 d, meaning that ammonia caused immunosuppression in birds. Moreover, high ammonia exposure down-regulated the expression of toll-like receptor 4 (TLR4) in lung tissue at 21 d, as well as TLR4 in lung and tracheal mucosa at 42 d when analysed using qRT-PCR. It increased SIgA in saliva at 42 d when analysed by ELISA. Ammonia increased interleukin-6 (IL-6), IL-1β, interferon-α (IFN-α), and IFN-γ in serum at 28 d from the ELISA assay, which indicated that all of these factors took part in ammonia-immunosuppression in birds.4. Three antioxidants (CAT, SOD, T-AOC) decreased, and one oxidant MDA increased after ammonia exposure in the liver and blood, which indicated that ammonia caused oxidative stress via the imbalance of antioxidants/oxidants in birds.5. Correlation analysis showed that TLR4 and TLR15 in the tracheal mucosa were significantly positively related to IFN-γ and negatively related to IL-6. TLR2 in the lung was significantly positively related to IL-1β, and TLR2 in bird tracheal mucosa was negatively related to IL-6 in serum.6. The results suggested that oxidative stress mediated immunosuppression caused by ammonia gas via antioxidant/oxidant imbalance in broilers.
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Affiliation(s)
- Y Guo
- Department of Animal Science, College of Biology and Food, Shangqiu Normal University, Shangqiu, Henan, China
- Henan Engineering Research Center of Development and Application of Green Feed Additives, Shangqiu, Henan, China
| | - J Zhang
- Department of Animal Science, College of Biology and Food, Shangqiu Normal University, Shangqiu, Henan, China
- Henan Engineering Research Center of Development and Application of Green Feed Additives, Shangqiu, Henan, China
| | - X Li
- Department of Genetics and Breeding, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - J Wu
- Department of Basic Veterinary Medicine, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - J Han
- Department of Animal Science, College of Biology and Food, Shangqiu Normal University, Shangqiu, Henan, China
- Henan Engineering Research Center of Development and Application of Green Feed Additives, Shangqiu, Henan, China
| | - G Yang
- Department of Animal Science, College of Biology and Food, Shangqiu Normal University, Shangqiu, Henan, China
- Henan Engineering Research Center of Development and Application of Green Feed Additives, Shangqiu, Henan, China
| | - L Zhang
- Department of Animal Science, College of Biology and Food, Shangqiu Normal University, Shangqiu, Henan, China
- Henan Engineering Research Center of Development and Application of Green Feed Additives, Shangqiu, Henan, China
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