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MiR-27-3p regulates TLR2/4-dependent mouse alveolar macrophage activation by targetting PPARγ

Dan Wang1, Sirong He2, Bicui Liu1

  • 1Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University (Chengdu), Chengdu 610041, P.R. China.

Clinical Science (London, England : 1979)
|March 25, 2018
PubMed

Insights

MicroRNA-27-3p promotes chronic obstructive pulmonary disease (COPD) by activating inflammatory pathways in alveolar macrophages. Inhibiting this microRNA may offer a therapeutic strategy for COPD by restoring PPARγ function.

Area of Science:

  • Pulmonary Medicine
  • Molecular Biology
  • Immunology

Background:

  • Alveolar macrophage (AM) activation and cytokine release are central to chronic obstructive pulmonary disease (COPD) pathogenesis.
  • Mechanisms regulating AM activation, particularly microRNA (miRNA) involvement, remain incompletely understood.
  • miRNAs are emerging as critical regulators of inflammatory responses and macrophage polarization.

Purpose of the Study:

  • To investigate the role of specific miRNAs in AM activation during COPD.
  • To elucidate the molecular mechanisms by which miR-27-3p influences AM activation and inflammatory signaling.
  • To explore the therapeutic potential of targeting the miR-27-3p/PPARγ axis in COPD.

Main Methods:

  • miRNA microarray analysis to identify differentially expressed miRNAs in response to cigarette smoke (CS) and lipopolysaccharide (LPS) exposure.
  • In vitro studies using AMs to assess the functional impact of miR-27-3p on cytokine production, polarization, and intracellular signaling pathways (TLR2/4, NF-κB, JNK/p38, JAK/STAT).
  • Analysis of the interaction between miR-27-3p and peroxisome proliferator-activated receptor gamma (PPARγ) via 3'-UTR targeting and assessment of PPARγ activation effects.

Main Results:

  • miR-27-3p expression was significantly upregulated in AMs and lung tissues of mice exposed to CS/LPS.
  • miR-27-3p promoted pro-inflammatory cytokine production and AM polarization by inhibiting PPARγ activation and enhancing TLR2/4 signaling.
  • PPARγ activation counteracted CS/LPS-induced AM activation and pulmonary inflammation by suppressing TLR signaling pathways.

Conclusions:

  • miR-27-3p acts as a key mediator of AM activation in COPD pathogenesis.
  • The miR-27-3p/PPARγ axis represents a critical regulatory pathway influencing TLR signaling and inflammation in AMs.
  • Targeting miR-27-3p or enhancing PPARγ activation may represent novel therapeutic strategies for COPD.
Keywords:
Alveolar macrophagesCOPDMiR-27-3pPPARγTLR2/4

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