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MicroRNA-127 inhibits lung inflammation by targeting IgG Fcγ receptor I
Ting Xie1, Jiurong Liang, Ningshan Liu
1Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA.
Abstract:
The molecular mechanisms of acute lung injury are incompletely understood. MicroRNAs (miRNAs) are crucial biological regulators that act by suppressing their target genes and are involved in a variety of pathophysiologic processes. miR-127 appears to be downregulated during lung injury. We set out to investigate the role of miR-127 in lung injury and inflammation. Expression of miR-127 significantly reduced cytokine release by macrophages. Looking into the mechanisms of regulation of inflammation by miR-127, we found that IgG FcγRI (CD64) was a target of miR-127, as evidenced by reduced CD64 protein expression in macrophages overexpressing miR-127. Furthermore, miR-127 significantly reduced the luciferase activity with a reporter construct containing the native 3' untranslated region of CD64. Importantly, we demonstrated that miR-127 attenuated lung inflammation in an IgG immune complex model in vivo. Collectively, these data show that miR-127 targets macrophage CD64 expression and promotes the reduction of lung inflammation. Understanding how miRNAs regulate lung inflammation may represent an attractive way to control inflammation induced by infectious or noninfectious lung injury.
Insights
MicroRNAs (miRNAs) like miR-127 can reduce lung inflammation by targeting macrophage CD64 expression. This discovery offers a new approach to controlling inflammation in acute lung injury.
Area of Science:
- Molecular Biology
- Immunology
- Pulmonary Medicine
Background:
- Acute lung injury mechanisms remain unclear.
- MicroRNAs (miRNAs) are key gene regulators involved in disease.
- miR-127 levels decrease during lung injury.
Purpose of the Study:
- Investigate miR-127's role in lung injury and inflammation.
- Determine if miR-127 regulates macrophage inflammatory responses.
- Identify miR-127's molecular targets in inflammation.
Main Methods:
- Assessed miR-127 expression and its effect on cytokine release in macrophages.
- Validated IgG FcγRI (CD64) as a direct miR-127 target using protein assays and luciferase reporter assays.
- Evaluated miR-127's efficacy in reducing lung inflammation in an in vivo IgG immune complex model.
Main Results:
- miR-127 significantly reduced cytokine release from macrophages.
- miR-127 directly targets and downregulates CD64 protein expression in macrophages.
- Overexpression of miR-127 attenuated lung inflammation in vivo.
Conclusions:
- miR-127 plays a protective role in lung inflammation by targeting macrophage CD64.
- miR-127 represents a potential therapeutic target for controlling lung inflammation.
- Understanding miRNA-mediated regulation of inflammation is crucial for treating lung injury.
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