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Published on: August 1, 2012
Spermidine Associated with Gut Microbiota Protects Against MRSA Bloodstream Infection by Promoting Macrophage M2
Qingqing Li1,2, Ping Tian1,2, Mingjuan Guo3
1Department of Infectious Diseases & Anhui Center for Surveillance of Bacterial Resistance, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China.
Abstract:
Methicillin-resistant Staphylococcus aureus (MRSA) is a major human pathogen that causes various diseases. Extensive researches highlight the significant role of gut microbiota and its metabolites, particularly spermidine, in infectious diseases. However, the immunomodulatory mechanisms of spermidine in MRSA-induced bloodstream infection remain unclear. Here, we confirmed the protective effects of spermidine in bloodstream infection in mice. Spermidine reduced the bacterial load and expression of inflammatory factors by shifting the macrophage phenotype to an anti-inflammatory phenotype, ultimately prolonging the survival of the infected mice. The protective effect against MRSA infection may rely on the elevated expression of protein tyrosine phosphatase nonreceptor 2 (PTPN2). Collectively, these findings confirm the immunoprotective effects of spermidine via binding to PTPN2 in MRSA bloodstream infection, providing new ideas for the treatment of related infectious diseases.
Insights
Spermidine protects against Methicillin-resistant Staphylococcus aureus (MRSA) bloodstream infections by reducing bacteria and inflammation. It shifts macrophages to an anti-inflammatory state, potentially through PTPN2, improving survival.
Area of Science:
- Microbiology
- Immunology
- Metabolomics
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen.
- Gut microbiota metabolites, like spermidine, influence infectious diseases.
- Spermidine's immunomodulatory role in MRSA bloodstream infection is not fully understood.
Purpose of the Study:
- To investigate the protective effects and mechanisms of spermidine in MRSA-induced bloodstream infection.
Main Methods:
- Animal model of MRSA bloodstream infection.
- Assessment of bacterial load and inflammatory markers.
- Macrophage phenotype analysis.
- Protein tyrosine phosphatase nonreceptor 2 (PTPN2) expression analysis.
Main Results:
- Spermidine administration reduced MRSA bacterial load and inflammatory factor expression.
- Spermidine promoted a shift towards an anti-inflammatory macrophage phenotype.
- Elevated protein tyrosine phosphatase nonreceptor 2 (PTPN2) expression was observed.
- Spermidine treatment prolonged survival in infected mice.
Conclusions:
- Spermidine exhibits protective effects against MRSA bloodstream infection.
- The mechanism involves shifting macrophage phenotype and potentially upregulating PTPN2.
- Spermidine offers a potential therapeutic strategy for MRSA infections.
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