Related Experiment Video
Updated: May 7, 2026
Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
Published on: November 3, 2014
Identification of microRNAs dysregulated in CD14 gene silencing RAW264.7 macrophage cells
1College of Agriculture, Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Animal Genetic Engineering Key Lab of Haikou, Hainan University, Haidian Island, Haikou, 570228, People's Republic of China.
Abstract:
A cluster of differentiation antigen 14 (CD14) is involved in lipopolysaccharide (LPS)-induced proinflammatory cytokine release and LPS-induced septic shock. MicroRNAs (miRNAs) are short non-coding RNAs that are involved in the epigenetic regulation of cellular process and bacterial infection. Our previous study indicated that siRNA against CD14 effectively inhibited LPS-induced tumor necrosis factor alpha, chemokine (C-X-C motif) ligand 2, interleukin-6 release, and NO production. To identify miRNAs which are affected by CD14 gene silencing and dissect the mechanisms of the attenuating of LPS-induced damaging immune activation more clearly, based on the CD14 knockdown RAW264.7 macrophage cell line established in our previous study, miRNAs expression profiling of CD14 knockdown RAW264.7 cells were analyzed with miRNA microarray and validated by qRT-PCR, the potential targets were predicted and subjected to gene ontology (GO) pathway and biological processes analysis. We demonstrated for the first time that CD14 knockdown significantly changed the expression of 199a-3p, miR-199a-5p, and miR-21-5p in RAW264.7 cells, and significantly enriched GO terms in the predicted target genes of these miRNAs were apoptosis process, immune response, inflammatory response, innate immune response, anti-apoptosis, cytokine production, and cytokine-mediated signaling pathway. These findings may improve our understanding about functional mechanism of miRNAs in the attenuating of LPS-induced damaging immune activation more clearly.
Insights
CD14 gene silencing alters microRNA expression in macrophages, impacting immune responses to lipopolysaccharide (LPS). This research clarifies how microRNAs regulate inflammation and immune activation.
Area of Science:
- Immunology
- Molecular Biology
- Epigenetics
Background:
- Cluster of differentiation antigen 14 (CD14) mediates lipopolysaccharide (LPS)-induced inflammatory responses and septic shock.
- MicroRNAs (miRNAs) are key epigenetic regulators in cellular processes and infection.
- Previous studies showed siRNA targeting CD14 reduced LPS-induced cytokine release and nitric oxide (NO) production.
Purpose of the Study:
- To identify miRNAs affected by CD14 gene silencing.
- To elucidate the mechanisms by which miRNAs attenuate LPS-induced immune activation.
- To analyze the functional roles of altered miRNAs in macrophage response.
Main Methods:
- Established a CD14 knockdown RAW264.7 macrophage cell line.
- Performed miRNA expression profiling using miRNA microarray.
- Validated miRNA expression changes using quantitative real-time PCR (qRT-PCR).
- Predicted potential miRNA targets and performed Gene Ontology (GO) pathway analysis.
Main Results:
- CD14 knockdown significantly altered the expression of miR-199a-3p, miR-199a-5p, and miR-21-5p in RAW264.7 cells.
- Enriched Gene Ontology terms for predicted miRNA targets included apoptosis, immune response, inflammatory response, and cytokine-mediated signaling pathways.
- Identified specific miRNAs involved in the CD14-mediated regulation of LPS-induced immune activation.
Conclusions:
- CD14 knockdown influences specific miRNA expression profiles in macrophages.
- These altered miRNAs play roles in regulating apoptosis, immune, and inflammatory responses.
- Findings enhance understanding of miRNA functional mechanisms in mitigating LPS-induced immune overactivation.
Related Concept Videos
01:22MicroRNAs
01:22MicroRNAs