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To study the effect of hypoxia on immune function of juvenile cobia (Rachycentron canadum), the transcription level of immune related genes were detected in gills, liver, intestines, and spleen after exposing to (3.15±0.21) mg/L hypoxia stress for 28 d. The results showed: (1) in gills, the transcription level of tumor necrosis factor α (TNFα) and type 2 interleukin-1 receptor (IL-1R2) extremely decreased (p<0.01) on 1 d and 14 d of stress. On 28 d of stress, TNFα extremely decreased (p<0.01) while IL-1R2 significantly decreased (p<0.05). Tumor necrosis factor alpha induced protein 3 (TNFAIP3) extremely increased (p<0.01) on 1 d and then significantly decreased (p<0.05) on 7 d and extremely decreased (p<0.01) on 14 d. Interleukin-1β (IL-1β) extremely decreased (p<0.01) on 1 d and then extremely increased (p<0.01) . Interleukin-17C (IL-17C) extremely decreased (p<0.01) on 7 d and 14 d, while heat shock protein 70 (HSP70) significantly decreased (p<0.05) on 1 d and extremely decreased (p<0.01) on 14 d and 28 d. (2) In liver, the transcription level of TNFα and IL-1R2 significantly decreased (p<0.05) on 1 d and 28 d and extremely decreased (p<0.01) on 14 d. TNFAIP3 extremely increased (p<0.01) on 1 d and extremely decreased (p<0.01) on 14 d and 28 d. IL-1β extremely increased (p<0.01) at all stress time points, while IL-17C extremely decreased (p<0.01) on 7 d, 14 d and 28 d. HSP70 continued to increase and reached the maximum on 28 d (p<0.01). (3) In the intestine, the transcription level of TNFα, IL-1β, IL-1R2, IL-17C and HSP70 genes were higher (p<0.01) than those in the control group at all stress time points. TNFAIP3 extremely increased (p<0.01) on 1 d and significantly decreased (p<0.05) on 7 d and extremely decreased (p<0.01) on 14 d. (4) In spleen, the transcription level of TNFα and IL-17C extremely decreased (p<0.01) on 1 d, 7 d, 14 d and significantly decreased (p<0.05) on 28 d. IL-1β extremely decreased (p<0.01) on 1 d, 28 d and significantly decreased (p<0.05) on 7 d and 14 d. IL-1R2 extremely decreased (p<0.01) on 1 d, 7 d, 28 d and significantly decreased (p<0.05) on 14 d, while HSP70 extremely decreased (p<0.01) on 1 d, 7 d and 28 d. The results indicated that immune genes of transcription level in juvenile cobia showed significantly change after 28 d of hypoxia stress, suggesting that long-term hypoxia may inhibit the immune function, cause intestinal inflammation, and increase the risk of pathogen infection in cobia.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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