Frontiers in Microbiology (Jun 2021)

PCV2 Triggers PK-15 Cell Apoptosis Through the PLC–IP3R–Ca2+ Signaling Pathway

  • Shuo Wang,
  • Shuo Wang,
  • Chen Li,
  • Panpan Sun,
  • Jianli Shi,
  • Xiaoyan Wu,
  • Xiaoyan Wu,
  • Chang Liu,
  • Zhe Peng,
  • Hong Han,
  • Shaojian Xu,
  • Ying Yang,
  • Ying Yang,
  • Yao Tian,
  • Yao Tian,
  • Jiaxin Li,
  • Jiaxin Li,
  • Hongbin He,
  • Jun Li,
  • Jun Li,
  • Jun Li,
  • Zhao Wang

DOI
https://doi.org/10.3389/fmicb.2021.674907
Journal volume & issue
Vol. 12

Abstract

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The endoplasmic reticulum (ER) plays an essential role in Ca2+ concentration balance and protein biosynthesis. During infection, the virus needs to complete its life process with the help of ER. At the same time, ER also produces ER stress (ERS), which induces apoptosis to resist virus infection. Our study explored the Ca2+ concentration, ERS, and the apoptosis mechanism after porcine circovirus 2 (PCV2) infection. We show here that PCV2 infection induces the increased cytoplasmic Ca2+ level and PK-15 cell ER swelling. The colocalization of phospholipase C (PLC) and inositol 1,4,5-trisphosphate receptor (IP3R) in the cytoplasm was observed by laser confocal microscopy. Western blot and quantitative polymerase chain reaction experiments confirmed that PLC and IP3R expression levels increased after PCV2 infection, and Ca2+ concentration in the cytoplasm increased after virus infection. These results suggest that PCV2 infection triggers ERS of PK-15 cells via the PLC–IP3R–Ca2+ signaling pathway to promote the release of intracellular Ca2+ and led to cell apoptosis.

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