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Updated: Apr 23, 2026
Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
[Effect on M1 macrophages of shenlian extracts]
Abstract:
This study discusses the effects of Shenlian extracts (SL) on M1 macrophages in atherosclerosis. The MTT assay was used to detect the growth inhibition rates of RAW264.7 cells. RAW264.7 cells were stimulated with murine interferon-gamma (IFN-gamma) plus lipopolysaccharide (LPS) to induce M1 macrophages. The different concentrations of SL extracts (high-dose 50 mg x L(-1), moderate-dose 25 mg x L(-1), low-dose 12.5 mg x L(-1)) were added. The CD86 of M1 macrophages in cell membrane was measured by flow cytometry. The mRNA expression of iNOS and TNF-alpha gene was detected by reverse transcription PCR (RT-PCR). And the supernatants were collected, the content of IL-6 and TNF-alpha were detected with ELISA kits. The results of this experiment show that the expression of the cell membrane molecule CD86, iNOS and TNF-alpha gene, the content of IL-6 and TNF-alpha was obviously increased in M1 macrophages by IFN-gamma and LPS. The different doses of SL extract could reduce the expression of the above indicators. The above experimental results demonstrate that IFN-gamma combined LPS can induce RAW264.7 cell to type into M1 macrophages, and SL extracts can inhibit M1 macrophages.
Insights
Shenlian extracts (SL) inhibit M1 macrophages, a key factor in atherosclerosis. This study shows SL reduces inflammatory markers induced by interferon-gamma (IFN-γ) and lipopolysaccharide (LPS) in RAW264.7 cells.
Area of Science:
- Immunology
- Pharmacology
- Biochemistry
Context:
- Atherosclerosis involves M1 macrophage polarization, contributing to inflammation.
- Interferon-gamma (IFN-γ) and lipopolysaccharide (LPS) are potent inducers of M1 macrophages.
- RAW264.7 cells serve as a model for studying macrophage activation.
Purpose:
- To investigate the inhibitory effects of Shenlian extracts (SL) on M1 macrophages.
- To evaluate SL's impact on M1 macrophage markers and inflammatory mediators.
Summary:
- IFN-γ and LPS significantly increased M1 macrophage markers (CD86, iNOS, TNF-α) and inflammatory cytokines (IL-6, TNF-α) in RAW264.7 cells.
- Shenlian extracts, at various doses, effectively reduced the expression of these M1 macrophage indicators.
- SL demonstrated a dose-dependent inhibition of M1 macrophage activation.
Impact:
- Shenlian extracts show potential as a therapeutic agent for atherosclerosis by modulating M1 macrophage activity.
- This research provides insights into the anti-inflammatory mechanisms of SL in the context of macrophage polarization.
- Findings support further investigation of SL for managing inflammatory diseases.
