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Updated: May 16, 2026
Isolation and In vitro Culture of Bone Marrow-Derived Macrophages for the Study of NO-Redox Biology
Published on: May 31, 2022
[Optimization of a lipopolysaccharide-stimulated nitric oxide production model in mouse peritoneal macrophages]
Li Huang1, Hong Xia, Yuning Lun
1School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China. huangli12.6@163.com
Objective:
To optimize the experimental model of nitric oxide (NO) production in mouse peritoneal macrophages in response to lipopolysaccharides (LPS) stimulation.
Methods:
Mouse resident peritoneal macrophages were collected by lavaging the peritoneal cavity of mice with Hank's solution and stimulated with Pseudomonas aeruginosa LPS for NO production. NO concentration in the culture supernatants was measured with Griess Reagent. The influences of cell density, LPS concentration, LPS stimulation duration and culture medium volume on NO production were investigated. Finally, the feasibility of the model was confirmed with specific anti-inflammatory drugs.
Results:
The density of macrophages produced the most significant effect on NO production (P<0.001), and optimal results were obtained at the macrophage density of 6×10(6) cells/ml with a volume of 100 µl in each well in 96-well plate. At a LPS concentration below 1 µg/ml, NO production increased proportionally with the increment of LPS concentration (P<0.001), but the increment of NO production declined obviously at LPS concentrations beyond 1 µg/ml, and the peak NO production occurred at a LPS concentration of 10 µg/ml. NO production also increased significantly with the prolongation of LPS stimulation (P<0.05), and the increments were greater within 24-48 h than those in 48-72 h. NO content in the culture supernatant was associated with the medium volume, and the highest level occurred in a system volume of 100 µl. Aspirin (1 mmol/L), dexamethasone (10 µmol/L), and cyclosporin A (10 µmol/L) all significantly inhibited LPS-stimulated production of NO in mouse resident peritoneal macrophages (P<0.001).
Conclusions:
Macrophage density, LPS concentration, and the duration of LPS stimulation are the main factors affecting LPS-stimulated NO production in mouse resident peritoneal macrophages. The optimal results can be obtained with a macrophage density of 5×10(6) cells/ml (100 µl per well), LPS concentration of 10 µg/ml, LPS stimulation duration of 24 h or 48 h, and a culture medium volume of 100 to 200 µl.
Insights
This study optimized nitric oxide (NO) production in mouse macrophages stimulated by lipopolysaccharides (LPS). Optimal conditions involve specific cell densities, LPS concentrations, and stimulation durations for reliable NO measurement.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Nitric oxide (NO) is a critical signaling molecule in immune responses.
- Lipopolysaccharides (LPS) are potent stimulators of NO production in macrophages.
- Optimizing experimental models is crucial for studying NO-mediated inflammatory processes.
Purpose of the Study:
- To establish and optimize an experimental model for measuring nitric oxide (NO) production.
- To investigate the effects of lipopolysaccharides (LPS) on NO production in mouse peritoneal macrophages.
- To determine optimal parameters for LPS-stimulated NO production in vitro.
Main Methods:
- Mouse resident peritoneal macrophages were isolated and cultured.
- Cells were stimulated with varying concentrations of Pseudomonas aeruginosa LPS.
- Nitric oxide production was quantified using the Griess Reagent assay.
- Parameters optimized included cell density, LPS concentration, stimulation duration, and medium volume.
- Model validation was performed using anti-inflammatory drugs.
Main Results:
- Macrophage density significantly impacted NO production, with 6x10^6 cells/ml being optimal.
- Peak NO production occurred at 10 µg/ml LPS, with significant increases observed between 24-48 hours of stimulation.
- Optimal NO levels were measured with a culture medium volume of 100 µl.
- Aspirin, dexamethasone, and cyclosporin A significantly inhibited LPS-induced NO production.
Conclusions:
- Macrophage density, LPS concentration, and stimulation duration are key factors influencing NO production.
- Optimal conditions for the model include 5x10^6 cells/ml, 10 µg/ml LPS, and 24-48 hours of stimulation.
- The optimized model provides a reliable system for studying macrophage NO production and the effects of anti-inflammatory agents.
