The adverse impacts of ammonia stress on the homeostasis of intestinal health in Pacific white shrimp (Litopenaeus vannamei)
文献类型: 外文期刊
第一作者: Duan, Yafei
作者: Duan, Yafei;Nan, Yuxiu;Zhu, Xuanyi;Yang, Yukai;Xing, Yifu;Duan, Yafei;Yang, Yukai
作者机构:
关键词: Shrimp; Ammonia -N; Intestine microbial; Physiological; Metabolism
期刊名称:ENVIRONMENTAL POLLUTION ( 影响因子:8.9; 五年影响因子:9.5 )
ISSN: 0269-7491
年卷期: 2024 年 340 卷
页码:
收录情况: SCI
摘要: Ammonia is a prevalent pollutant in aquaculture systems that poses a risk to shrimp health. The shrimp's in-testine plays a crucial role in immunity and metabolism. Therefore, we exposed Litopenaeus vannamei to 2 mg/L ammonia-N stress for a duration of 7 days, and explored the alterations in intestinal tissue morphology, physi-ological status, microbial community, and metabolic function. The findings revealed that ammonia stress led to a decrease in shrimp survival rates and inflicted damage to the intestinal mucosa, resulting in epithelial exfolia-tion. The mRNA relative expression levels of oxidative stress genes (Nrf2 and SOD) were elevated, while the level of GPx was decreased. Additionally, there was an increase in the levels of endoplasmic reticulum stress genes (Bip, IRE1 and XBP1), inflammatory cytokines (NF-kappa B and JNK), and apoptosis mediators (CytC and Casp-3) were increased. Ammonia stress also caused a decline in intestinal microbial diversity and significant variations in the bacterial community composition, including Bacteroides, Enterococcus, Faecalibacterium, Nautella, Pseudoalter-omonas, Tenacibaculum, and Weissella. Furthermore, ammonia stress disrupted the intestinal metabolic function, particularly affecting pyrimidine, purine, amino acid, and alkaloid metabolism. These results revealed that 2 mg/ L ammonia-N stress damaged the intestinal health of the shrimp by damaging mucosal integrity, affecting physiological homeostasis, causing microbial community and metabolic variation, which are related to the decreased survival of the shrimp and should be paid attention to in shrimp farming.
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