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Updated: Jul 10, 2026
Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
Published on: November 3, 2014
[A research on blockage of receptor-interacting protein 2 expression by small interfering RNA in murine macrophages]
Hong-Chun Liu1, Zhong-Wei Cao, Jian-Jun Jin
1Department of Gastroenterology, Zhongshan Hospital, Fudan University, Shanghai 200032, China.
Objective:
To provide evidence that blocking the receptor-interacting protein 2 (Rip2) expression can decrease inflammatory cytokine production by macrophage and protect mice from endotoxin lethality.
Methods:
Murine Rip2 small interfering RNA (siRNA) plamids were constructed and transfected into macrophages and Rip2 expression was assessed with RT-PCR and Western blot. Cell proliferation was assayed with MTT; TNFalpha concentration was assayed with ELISA and high-mobility group box 1 protein (HMGB1) level with semi quantitative Western blot after lipopolysaccharide (LPS) stimulation. LPS challenge was given after the plasmids were injected into mice and the survival rate was calculated. Rip2 and HMGB1 expression in liver was assessed with Western blot and serum TNFalpha level with ELISA.
Results:
Rip2 siRNA plasmids could block the mRNA and protein expression of Rip2 and promote cell proliferation. Blocking of Rip2 could attenuate LPS-induced TNFalpha and HMGB1 production. HMGB1 expression in liver were decreased to (40.21 +/- 11.03) pg/g and serum TNFalpha level was decreased to (300.43 +/- 59.26) ng/L (P < 0.05). The survival rate of endotoxemic mice was also improved (P < 0.05).
Conclusion:
The results demonstrate that Rip2 siRNA plasmids can block the expression of Rip2, and decrease the production of TNFalpha and HMGB1, thus protect mice from lethal endotoxemia.
Insights
Blocking receptor-interacting protein 2 (Rip2) with siRNA reduced inflammatory cytokine production and protected mice from lethal endotoxemia. This study highlights Rip2 as a potential therapeutic target for sepsis.
Area of Science:
- Immunology
- Molecular Biology
Background:
- Sepsis is a life-threatening condition characterized by dysregulated immune response.
- Receptor-interacting protein 2 (Rip2) plays a role in inflammatory signaling pathways.
Purpose of the Study:
- To investigate the therapeutic potential of blocking Rip2 expression.
- To determine if Rip2 inhibition can mitigate inflammatory responses and improve survival in a mouse model of endotoxemia.
Main Methods:
- Small interfering RNA (siRNA) targeting Rip2 was designed and transfected into murine macrophages.
- Rip2 expression, cell proliferation, and inflammatory cytokine (TNF-alpha, HMGB1) production were assessed.
- Mice were challenged with lipopolysaccharide (LPS) after Rip2 siRNA administration, and survival rates were monitored.
Main Results:
- Rip2 siRNA effectively reduced Rip2 mRNA and protein expression in macrophages.
- Blocking Rip2 attenuated LPS-induced production of TNF-alpha and HMGB1.
- Administration of Rip2 siRNA significantly improved survival rates in endotoxemic mice.
Conclusions:
- Rip2 siRNA effectively inhibits Rip2 expression, leading to decreased production of key inflammatory mediators.
- Targeting Rip2 offers a promising therapeutic strategy for combating lethal endotoxemia and sepsis.
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