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The tumor suppressor protein p53 plays a critical role in cell cycle, apoptosis and DNA repair. In this study, the full-length pufferfish p53 (Pf-p53) was obtained, containing an open reading frame of 1095 bp, a 5'UTR of 157 bp and a 3'UTR of 285 bp with a poly (A) tail. The Pf-p53 encoded a polypeptide of 364 amino acids with a theoretical isoelectric point of 8.03 and predicted molecular weight of 40.6 kDa. Pf-p53 was ubiquitously expressed in various tissues with a high-level expression in kidney, liver and gill. Vibrio alginolyticus challenge could induce ROS production and disrupt Ca2+ homeostasis, subsequently leading to the induction of DNA damage and apoptosis, while the Vibrio alginolyticus-induced oxidative stress can also increase the non-specific immunity. The pufferfish challenged with Vibrio alginolyticus showed a sharp increase of Pf-p53 transcript in liver. Subcellular localization analysis revealed that Pf-p53 was primarily localized in nucleus. Furthermore, overexpression of Pf-p53 in Hela cells could inhibit cell proliferation and the transcriptional activities of the NF-ĸB promoter. Taken together, our results indicated that Pf-p53 may play an important role in the immune response to Vibrio alginolyticus challenge. Copyright © 2016 Elsevier Ltd. All rights reserved.

Citation

Chang-Hong Cheng, Sheng-Wei Luo, Chao-Xia Ye, An-Li Wang, Zhi-Xun Guo. Identification, characterization and expression analysis of tumor suppressor protein p53 from pufferfish (Takifugu obscurus) after the Vibrio alginolyticus challenge. Fish & shellfish immunology. 2016 Dec;59:312-322

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PMID: 27815196

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