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Published on: June 23, 2013
miR-142-5p and miR-130a-3p regulate pulmonary macrophage polarization and asthma airway remodeling
Jianting Shi1, Ming Chen1, Lihua Ouyang2
1Department of Respiratory Medicine, Sun Yat-Sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.
Abstract:
Macrophages are key regulators of the development and progression of asthma, facilitating deleterious airway remodeling in affected patients. Immune cell function is tightly regulated by microRNAs (miRNAs), but how these miRNAs impact macrophage-mediated airway remodeling in the context of asthma remains to be determined. In this study, we utilized an ovalbumin (OVA)-based murine model of asthma to evaluate the importance of miRNAs within these macrophages. We found that macrophages from mice that had been sensitized with and exposed to OVA expressed higher levels of M2-like phenotypic markers and exhibited significantly altered expression of both miR-142-5p and miR-130a-3p. When these isolated pulmonary macrophages were cultured in vitro, we determined that transfecting them with miR-142-5p antisense oligonucleotide (ASO) or miR-130a-3p mimics was sufficient to inhibit the ability of interleukin-4 to induce M2 cytokine production. We additionally confirmed the in vivo relevance of these miRNAs in a Ccr2-/- murine model system mimicking asthma. Specifically, we determined that transfecting monocytes with miR-142-5p ASO and/or miR-130a-3p mimics was sufficient to disrupt the ability of these cells to promote airway remodeling. As such, these findings reveal that miR-142-5p and miR-130a-3p dysregulation are important factors governing the polarization of macrophages and associated airway remodeling in OVA-sensitized mice.
Insights
MicroRNAs miR-142-5p and miR-130a-3p regulate macrophage polarization in asthma. Targeting these microRNAs (miRNAs) in macrophages can inhibit airway remodeling, offering potential therapeutic strategies for asthma patients.
Area of Science:
- Immunology
- Molecular Biology
- Respiratory Medicine
Background:
- Macrophages are crucial in asthma development and airway remodeling.
- MicroRNAs (miRNAs) regulate immune cell function, but their role in macrophage-mediated asthma pathology is unclear.
Purpose of the Study:
- To investigate the role of specific miRNAs in macrophage polarization and airway remodeling in a murine asthma model.
- To identify key miRNAs involved in regulating M2-like macrophage phenotypes in asthma.
Main Methods:
- Utilized an ovalbumin (OVA)-induced murine model of asthma.
- Analyzed miRNA expression (miR-142-5p, miR-130a-3p) in pulmonary macrophages.
- Performed in vitro and in vivo experiments using antisense oligonucleotides (ASO) and mimics to modulate miRNA function.
- Evaluated effects on M2 cytokine production and airway remodeling in Ccr2 knockout mice.
Main Results:
- Macrophages from OVA-sensitized mice showed increased M2 markers and altered miR-142-5p and miR-130a-3p expression.
- Inhibition of miR-142-5p or miR-130a-3p suppressed IL-4-induced M2 cytokine production in vitro.
- In vivo manipulation of these miRNAs disrupted macrophage-mediated airway remodeling in a Ccr2-/- asthma model.
Conclusions:
- Dysregulation of miR-142-5p and miR-130a-3p contributes to macrophage polarization in asthma.
- These miRNAs are key regulators of airway remodeling in an OVA-induced asthma model.
- Targeting miR-142-5p and miR-130a-3p may offer novel therapeutic approaches for asthma.
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