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Published on: March 2, 2014
Phospholipase PLA2G16 Accelerates the Host Interferon Signaling Pathway Response to FMDV
Bingjie Sun1, Xiaodong Qin1, Taoqing Zhang1
1State Key Laboratory for Animal Disease Control and Prevention, National Foot and Mouth Disease Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China.
Abstract:
PLA2G16 is a member of the phospholipase A2 family that catalyzes the generation of lysophosphatidic acids (LPAs) and free fatty acids (FFAs) from phosphatidic acid. Previously, PLA2G16 was found to be a host factor for picornaviruses. Here, we discovered that the Foot-and-Mouth Disease Virus (FMDV) infection led to an elevation in PLA2G16 transcription. We established PLA2G16 overexpression and knockdown cell lines in PK-15 cells to investigate the potential role of PLA2G16 in FMDV infection. Our findings revealed that during FMDV infection, PLA2G16-overexpressing cells had increased levels of phosphorylated STAT1 and the interferon-stimulating factors ISG15 and ISG56. In PLA2G16-overexpressing cells, p-STAT1 was observed at higher levels and earlier than in wild-type cells. Subsequent research demonstrated that PLA2G16 specifically promoted an antiviral innate immune response against FMDV. The host could detect the early release of FMDV viral nucleic acid in PLA2G16-overexpressing cells and trigger the interferon signaling pathway. Additionally, we discovered that the supernatants of PLA2G16-overexpressing cells stimulated the production of higher levels of ISG56 and phosphorylated STAT1. This suggests that PLA2G16-overexpressing cells can activate the innate immune pathway of uninfected cells after FMDV infection.
Insights
Phospholipase A2 Group 16 (PLA2G16) enhances the innate immune response against Foot-and-Mouth Disease Virus (FMDV). Overexpression of PLA2G16 boosts antiviral defenses by activating interferon signaling pathways.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Phospholipase A2 Group 16 (PLA2G16) is known to be a host factor for picornaviruses.
- PLA2G16 hydrolyzes phosphatidic acid into lysophosphatidic acids and free fatty acids.
Purpose of the Study:
- To investigate the role of PLA2G16 in the host's response to Foot-and-Mouth Disease Virus (FMDV) infection.
- To elucidate the mechanism by which PLA2G16 influences antiviral immunity against FMDV.
Main Methods:
- Established PLA2G16 overexpression and knockdown cell lines in PK-15 cells.
- Analyzed the expression of interferon-stimulating genes (ISG15, ISG56) and phosphorylated STAT1 (p-STAT1) during FMDV infection.
- Assessed the impact of PLA2G16 on the interferon signaling pathway activation.
Main Results:
- FMDV infection elevated PLA2G16 transcription.
- PLA2G16 overexpression enhanced antiviral innate immunity against FMDV.
- PLA2G16-overexpressing cells showed increased p-STAT1, ISG15, and ISG56 levels, indicating triggered interferon signaling.
- Supernatants from PLA2G16-overexpressing cells activated innate immunity in uninfected cells.
Conclusions:
- PLA2G16 plays a crucial role in promoting an antiviral innate immune response against FMDV.
- PLA2G16 facilitates the early detection of viral nucleic acid and subsequent interferon pathway activation.
- PLA2G16-expressing cells can prime uninfected cells to mount a stronger antiviral defense.
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