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Ammonia stress–induced apoptosis by p53–BAX/BCL-2 signal pathway in hepatopancreas of common carp (Cyprinus carpio)

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Abstract

Ammonia is the main environmental pollutant in aquaculture that has a negative impact on the healthy cultivation of common carp. The effects of antioxidant capacity, histopathology, and related gene expression of common carp (Cyprinus carpio) under ammonia stress (2.6 mM ammonia concentration, 168 h) were studied. In the study, ammonia stress can lead to oxidative stress in common carp, which is related to the regulation of SOD, GSH-PX, and CAT activities. Histopathology and TUNEL assays confirmed that apoptosis occurred in the hepatopancreas after ammonia stress, and the rate of apoptosis increased significantly with increasing exposure time (P < 0.05). We found the mRNA expression of p53, BAX, caspase-9, and caspase-3 were significantly enhanced (P < 0.05), and the transcriptional expression of BCL-2 was significantly inhibited (P < 0.05) in the late stage of ammonia exposure (96 h and 168 h). The results showed the apoptosis in the hepatopancreas of common carp under ammonia stress may be mediated by oxidative stress through the p53–BAX/BCL-2 apoptosis signal pathway.

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Funding

This study was supported by the Ministry of Agriculture Finance Special Sub-project, Investigation of Fishery Resources and Environment in Key Waters of Northeast China, and the China Agriculture Research System (CARS-45-06).

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Shuqun Xue completed the experiment and wrote the manuscript. Jiawen Lin and Yue Han completed part of the experiment and data analysis. Ying Han provided ideas for the experiment.

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Correspondence to Ying Han.

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All procedures followed the European Directive 2010/63/EU for animal experiments and were approved by the local ethics committee.

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The authors declare no competing interests.

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Xue, S., Lin, J., Han, Y. et al. Ammonia stress–induced apoptosis by p53–BAX/BCL-2 signal pathway in hepatopancreas of common carp (Cyprinus carpio). Aquacult Int 29, 1895–1907 (2021). https://doi.org/10.1007/s10499-021-00724-3

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  • DOI: https://doi.org/10.1007/s10499-021-00724-3

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