The Long Noncoding RNA Gm9866/Nuclear Factor-κB Axis Promotes Macrophage Polarization

Area of Science:

• Immunology
• Molecular Biology
• Epigenetics

Background:

• Macrophages are crucial immune cells with plastic M1/M2 phenotypes involved in disease.
• Long noncoding RNAs (lncRNAs) regulate cellular functions, but their role in macrophage polarization is largely unknown.
• Bioinformatics identified lncRNA Gm9866 as potentially involved in macrophage polarization.

Purpose of the Study:

• To investigate the role of long noncoding RNA Gm9866 in macrophage polarization.
• To elucidate the molecular mechanisms by which Gm9866 influences macrophage function.
• To assess the potential of Gm9866 as a therapeutic target in polarization-related diseases.

Main Methods:

• Real-time polymerase chain reaction (RT-PCR) to quantify Gm9866 expression.
• Fluorescence in situ hybridization (FISH) to determine Gm9866 subcellular localization.
• Overexpression studies in RAW264.7 cells to assess functional effects.
• Western blotting for NF-κB pathway analysis.
• EdU and TUNEL assays for cell proliferation and apoptosis assessment.

Main Results:

• Gm9866 expression increased with M2 polarization (IL-4) and decreased with M1 polarization (LPS).
• Gm9866 is primarily located in the nucleus.
• Overexpression of Gm9866 promoted M2 markers (MRC1, MRC2) and inhibited NF-κB signaling.
• Gm9866 overexpression enhanced cell proliferation and reduced apoptosis.

Conclusions:

• Long noncoding RNA Gm9866 promotes M2 macrophage polarization.
• Gm9866 inhibits the nuclear factor-κB (NF-κB) signaling pathway.
• Gm9866 represents a potential diagnostic and therapeutic target for diseases involving macrophage polarization, including infectious diseases, inflammatory conditions, liver fibrosis, and tumors.