Streptococcus pneumoniae Endopeptidase O Promotes the Clearance of Staphylococcus aureus and Streptococcus pneumoniae via SH2 Domain-Containing Inositol Phosphatase 1-Mediated Complement Receptor 3 Upregulation
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Increasing evidences demonstrate that microorganism and their products protect against bacterial and viral pathogens through various mechanisms including immunomodulation. Streptococcus pneumoniae endopeptidase O (PepO), a pneumococcal virulence protein, has been proven to enhance the phagocytosis of Staphylococcus aureus and Streptococcus pneumoniae by macrophages in our previous study, where we detected the down regulation of SH2 domain-containing inositol phosphatase 1 (SHIP1) and the up regulation of complement receptor 3 (CR3) in PepO-stimulated macrophages. In the present study, using SHIP1 over-expression plasmid and CR3 siRNA, we proved that the down regulation of SHIP1 and the up regulation of CR3 mediate the enhanced phagocytosis of S. aureus and S. pneumoniae by PepO-stimulated macrophages. The down regulation of SHIP1 also mediates the up regulation of CR3. To further determine whether PepO protects against respiratory pathogens, we constructed a mouse model with intranasal infection of S. aureus or S. pneumoniae and found that PepO significantly promoted their clearance. The down regulation of SHIP1 and the up regulation of CR3 also play a role in this process. This study provides a new preventive and therapeutic option for respiratory infectious diseases and lays the theoretical basis for the development of PepO as an immunomodulation agent.
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SHIP1 modulates CR3-mediated phagocytosis in macrophages.
“SHIP1 also has been shown to modulate complement receptor 3 (CR3)-mediated phagocytosis in macrophages [134, 138, 141].”
From Microglial function, INPP5D/SHIP1 signaling, and NLRP3 inflammasome activation: implications for Alzheimer’s disease (2023) · cites this paper as [141]
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- Authors
- Li, S., Zhang, H., Xiao, J., Yuan, T., Shu, Z., Min, Y., Xu, W., Yin, Y., & Zhang, X.
- Affiliations
- Chongqing Medical University (CN)
- North Sichuan Medical University (CN)
- Corresponding author
- Zhang, Xuemei
- Venue
- Frontiers in Cellular and Infection Microbiology
- Publisher
- Frontiers Media SA
- Published
- 2020-07-17
- Volume
- 10
- Pages
- 358-358
- ISSN
- 2235-2988 (ISSN-L)
- PMC
- PMC7379148
- OpenAlex
- W3042251325
- Cited by
- 8
- References
- 44
- Citations by year
- 2026: 1 · 2025: 3 · 2023: 2 · 2022: 1 · 2021: 1
- FWCI
- 0.72
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Cellular and Infection Microbiology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Natural Science Foundation of China (81701572)
- Topics
- Health Sciences › Medicine › Epidemiology › Pneumonia and Respiratory Infections
- Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Streptococcal Infections and Treatments
- Keywords
- PepO, SHIP1, complement receptor 3, CR3, macrophage phagocytosis, Staphylococcus aureus, Streptococcus pneumoniae, pneumococcal virulence factors, immunomodulation, intranasal infection, respiratory infections, bacterial clearance
- MeSH terms
- Animals, Bacterial Proteins, Metalloendopeptidases, Phosphoric Monoester Hydrolases, Staphylococcus aureus, Streptococcus pneumoniae, Up-Regulation, Macrophage-1 Antigen, src Homology Domains, Mice
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