Journal
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
Volume 246, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpc.2021.108976
Keywords
P53; Scylla paramamosain; Vibrio parahaemolyticus; DNA damage
Funding
- China Agriculture Research System [CARS-48]
- National Natural Science Foundation of China [32002380]
- Central Public-interest Scientific Institution Basal Research Fund, CAFS [2020TD42]
- Basic and applied basic research fund of Guangdong Province [2019A1515011548]
- Science and Technology Program Project of Guangzhou [201904010327]
- Open Foundation of Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences [2019011007]
- Central Public-interest Scientific Institution Basal Research Fund, South China Sea Fisheries Research Institute, CAFS [2020TS04]
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The tumor suppressor protein p53, encoded by the Sp-53 gene in mud crab, plays important roles in response to Vibrio parahaemolyticus infection, including regulation of antioxidant defense, DNA repair, and apoptosis. Knockdown of Sp-53 resulted in reduced expression of certain genes and increased mortality and DNA damage in mud crabs challenged by V. parahaemolyticus, highlighting the significance of Sp-53 in host defense mechanisms.
The tumor suppressor protein p53 plays important roles in DNA repair, cell cycle and genetic stability. In the present study, a p53 gene in the mud crab (Scylla paramamosain) (designated as Sp-53) was identified and characterized. The open reading frame of Sp-53 was comprised a 1383 bp, which encoded a putative protein of 460 amino acids. Sp-53 is expressed in all examined tissues, with the highest expression in hepatopancreas and hemocytes. Vibrio parahaemolyticus infection induced oxidative stress, and led to DNA damage. The Sp-53 transcriptions in hepatopancreas were significantly up-regulated after V. parahaemolyticus infection. RNA interference (RNAi) experiment was used to understand the roles of Sp-53 in response to V. parahaemolyticus infection. Knocking down Sp-53 in vivo significantly reduced the expression of the Mn-SOD, Gpx3 and caspase 3 after V. parahaemolyticus infection. Moreover, the mortality of mud crabs and DNA damage in Sp-53-silenced mud crab challenged with V. parahaemolyticus were significantly higher than those in the control group. All these results suggested that Sp-53 played an important role in responses to V. parahaemolyticus infection through its participation in regulation of antioxidant defense, DNA repair and apoptosis.
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