Parasites, Hosts and Diseases

The Korea Society for Parasitology and Tropical Medicine (대한기생충학·열대의학회)
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Toxoplasma gondii Induces Apoptosis via Endoplasmic Reticulum Stress-Derived Mitochondrial Pathway in Human Small Intestinal Epithelial Cell-Line

  • Wang, Hao (Department of Gastroenterology, Affiliated Hospital of Guangdong Medical University) ;
  • Li, Chunchao (Department of Gastroenterology, Affiliated Hospital of Guangdong Medical University) ;
  • Ye, Wei (Department of Obstetrics and Gynecology, Affiliated Hospital of Guangdong Medical University) ;
  • Pan, Zhaobin (Department of Gastroenterology, Affiliated Hospital of Guangdong Medical University) ;
  • Sun, Jinhui (Department of Gastroenterology, Affiliated Hospital of Guangdong Medical University) ;
  • Deng, Mingzhu (Stem Cell Research and Cellular Therapy Center, Affiliated Hospital of Guangdong Medical University) ;
  • Zhan, Weiqiang (Stem Cell Research and Cellular Therapy Center, Affiliated Hospital of Guangdong Medical University) ;
  • Chu, Jiaqi (Stem Cell Research and Cellular Therapy Center, Affiliated Hospital of Guangdong Medical University)
  • Received : 2021.07.24
  • Accepted : 2021.11.18
  • Published : 2021.12.31
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Abstract

Toxoplasma gondii, an intracellular protozoan parasite that infects one-third of the world's population, has been reported to hijack host cell apoptotic machinery and promote either an anti- or proapoptotic program depending on the parasite virulence and load and the host cell type. However, little is known about the regulation of human FHs 74 small intestinal epithelial cell viability in response to T. gondii infection. Here we show that T. gondii RH strain tachyzoite infection or ESP treatment of FHs 74 Int cells induced apoptosis, mitochondrial dysfunction and ER stress in host cells. Pretreatment with 4-PBA inhibited the expression or activation of key molecules involved in ER stress. In addition, both T. gondii and ESP challenge-induced mitochondrial dysfunction and cell death were dramatically suppressed in 4-PBA pretreated cells. Our study indicates that T. gondii infection induced ER stress in FHs 74 Int cells, which induced mitochondrial dysfunction followed by apoptosis. This may constitute a potential molecular mechanism responsible for the foodborne parasitic disease caused by T. gondii.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (81771612), the Characteristic Innovation Projects of Guangdong Universities (2018KTSCX081), the Guangdong Basic and Applied Basic Research Foundation (2019A1515011715), and the Competitive Allocation Project of Zhanjiang Municipal Science and Technology Development Special Fund (2020A01021).

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