An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosis
RIG-I and MDA5 are members of RIG-I-like receptors (RLRs) that detect viral RNA within the cytoplasm and subsequently initiate antiviral immune responses. Necroptosis is a form of programmed cell death (PCD) executed by mixed lineage kinase domain-like (MLKL), which, upon phosphorylation by receptor...
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Elsevier
2024-01-01
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| Series: | Current Research in Microbial Sciences |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666517424001019 |
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| author | Hang Xu Huili Li Boguang Sun Li Sun |
| author_facet | Hang Xu Huili Li Boguang Sun Li Sun |
| author_sort | Hang Xu |
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| description | RIG-I and MDA5 are members of RIG-I-like receptors (RLRs) that detect viral RNA within the cytoplasm and subsequently initiate antiviral immune responses. Necroptosis is a form of programmed cell death (PCD) executed by mixed lineage kinase domain-like (MLKL), which, upon phosphorylation by receptor-interacting protein kinase 3 (RIPK3), causes necrotic cell death. To date, no link between RLRs and necroptosis has been observed during bacterial infection. Edwardsiella tarda is a zoonotic bacterial pathogen that can thrive in host macrophages. In a previous study, we identified RIG-I and MDA5 as two hub factors of RAW264.7 cells responsive to E. tarda infection. The present study aimed to determine the specific form of cell death triggered by E. tarda and explore the association between RIG-I/MDA5 and PCD in the context of bacterial infection. Our results showed that E. tarda infection induced RIPK3-MLKL-mediated necroptosis, rather than pyroptosis or apoptosis, in RAW264.7 cells. Meanwhile, E. tarda promoted RIG-I/MDA5 production and activated the RIG-I/MDA5 pathways that led to IRF3 phosphorylation, IFN-β secretion, and interferon-stimulated gene (ISG) and cytokine expression. Both RIG-I and MDA5 were essential for E. tarda-triggered necroptosis and required for effective inhibition of intracellular bacterial replication. Furthermore, the regulatory effect of RIG-I/MDA5 on necroptosis was not affected by type I IFN or TNF-α signaling blockage. Together these results revealed that necroptosis could be triggered by intracellular bacterial infection through the RIG-I/MDA5 pathways, and that there existed intricate interplays between PCD and RLRs induced by bacterial pathogen. |
| format | Article |
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| institution | OA Journals |
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| language | English |
| publishDate | 2024-01-01 |
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| series | Current Research in Microbial Sciences |
| spelling | doaj-art-a43374394e3844bfb0937444e604dbed2025-08-20T02:19:55ZengElsevierCurrent Research in Microbial Sciences2666-51742024-01-01710031810.1016/j.crmicr.2024.100318An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosisHang Xu0Huili Li1Boguang Sun2Li Sun3CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology; CAS Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, China; College of Marine Sciences, University of Chinese Academy of Sciences, Qingdao, ChinaCAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology; CAS Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, China; College of Marine Sciences, University of Chinese Academy of Sciences, Qingdao, ChinaCAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology; CAS Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, China; College of Marine Sciences, University of Chinese Academy of Sciences, Qingdao, China; Corresponding authors.CAS and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology; CAS Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, China; College of Marine Sciences, University of Chinese Academy of Sciences, Qingdao, China; Corresponding authors.RIG-I and MDA5 are members of RIG-I-like receptors (RLRs) that detect viral RNA within the cytoplasm and subsequently initiate antiviral immune responses. Necroptosis is a form of programmed cell death (PCD) executed by mixed lineage kinase domain-like (MLKL), which, upon phosphorylation by receptor-interacting protein kinase 3 (RIPK3), causes necrotic cell death. To date, no link between RLRs and necroptosis has been observed during bacterial infection. Edwardsiella tarda is a zoonotic bacterial pathogen that can thrive in host macrophages. In a previous study, we identified RIG-I and MDA5 as two hub factors of RAW264.7 cells responsive to E. tarda infection. The present study aimed to determine the specific form of cell death triggered by E. tarda and explore the association between RIG-I/MDA5 and PCD in the context of bacterial infection. Our results showed that E. tarda infection induced RIPK3-MLKL-mediated necroptosis, rather than pyroptosis or apoptosis, in RAW264.7 cells. Meanwhile, E. tarda promoted RIG-I/MDA5 production and activated the RIG-I/MDA5 pathways that led to IRF3 phosphorylation, IFN-β secretion, and interferon-stimulated gene (ISG) and cytokine expression. Both RIG-I and MDA5 were essential for E. tarda-triggered necroptosis and required for effective inhibition of intracellular bacterial replication. Furthermore, the regulatory effect of RIG-I/MDA5 on necroptosis was not affected by type I IFN or TNF-α signaling blockage. Together these results revealed that necroptosis could be triggered by intracellular bacterial infection through the RIG-I/MDA5 pathways, and that there existed intricate interplays between PCD and RLRs induced by bacterial pathogen.http://www.sciencedirect.com/science/article/pii/S2666517424001019RIG-IMDA5NecroptosisEdwardsiella tardaInfection |
| spellingShingle | Hang Xu Huili Li Boguang Sun Li Sun An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosis Current Research in Microbial Sciences RIG-I MDA5 Necroptosis Edwardsiella tarda Infection |
| title | An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosis |
| title_full | An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosis |
| title_fullStr | An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosis |
| title_full_unstemmed | An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosis |
| title_short | An intracellular bacterial pathogen triggers RIG-I/MDA5-dependent necroptosis |
| title_sort | intracellular bacterial pathogen triggers rig i mda5 dependent necroptosis |
| topic | RIG-I MDA5 Necroptosis Edwardsiella tarda Infection |
| url | http://www.sciencedirect.com/science/article/pii/S2666517424001019 |
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