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Updated: Jun 2, 2026
Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
Published on: November 3, 2014
[Effect of miR-146a on IL-18 expression in mouse macrophage]
Yang Xiang1, Ming-hong Jiang, Dong-sheng Wang
1National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China. ilovefreyal1984@yahoo.com.cn
Aim:
To investigate the effect of miR-146a on the Th1/Th2 cytokine expression in mouse RAW264.7 cell line and primary peritoneal macrophage.
Methods:
miR-146a mimics, mimics negative control (NC mimics), inhibitor miR-146a and inhibitor negative control (NC inhibitor) were transfected into RAW264.7 cells and freshly isolated peritoneal macrophage. IL-18, IL-5 and IL-10 expressions in the cells were measured by real time PCR.
Results:
MiR-146a mimics suppressed IL-18 expression (P<0.05), and miR-146a specific inhibitor increased IL-18 expression significantly (P<0.05). However, IL-5 and IL-10 expressions were not affected by both miR-146a mimics and miR-146a inhibitor transfections.
Conclusion:
These data demonstrate at first time that miR-146a can regulate Th1 cytokine IL-18 expression, but not affect Th2 cytokine IL-5 and IL-10 expressions.
Insights
MicroRNA-146a (miR-146a) regulates T-helper 1 (Th1) cytokine IL-18 expression in macrophages. However, miR-146a does not impact T-helper 2 (Th2) cytokines IL-5 and IL-10.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Context:
- MicroRNAs (miRNAs) play crucial roles in regulating immune responses.
- T-helper (Th) cell differentiation is characterized by distinct cytokine profiles, influencing adaptive immunity.
- Macrophage activation and function are critical in innate and adaptive immune responses.
Purpose:
- To investigate the regulatory role of microRNA-146a (miR-146a) on T-helper 1 (Th1) and T-helper 2 (Th2) cytokine expression.
- To determine the effect of miR-146a modulation on Interleukin-18 (IL-18), IL-5, and IL-10 expression in macrophage cell lines and primary cells.
Summary:
- Transfection of miR-146a mimics into RAW264.7 cells and primary peritoneal macrophages suppressed IL-18 expression.
- Conversely, a miR-146a specific inhibitor significantly increased IL-18 expression.
- Expression levels of Th2 cytokines, IL-5 and IL-10, remained unaffected by both miR-146a mimics and inhibitors.
Impact:
- This study provides the first evidence that miR-146a specifically regulates Th1 cytokine IL-18 expression.
- The findings suggest a selective role for miR-146a in modulating Th1-biased immune responses.
- Understanding miR-146a's role in cytokine regulation can inform therapeutic strategies targeting immune-mediated diseases.
