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Characterization of lipopolysaccharide-stimulated cytokine expression in macrophages and monocytes
Haiqiu Huang1, Arnetta Fletcher, Yuge Niu
1Department of Nutrition and Food Science, University of Maryland, 0112 Skinner Building, College Park, MD 20742, USA.
Insights
Inflammation research using cell cultures requires careful control of lipopolysaccharide (LPS) dose and timing. Different cell lines, like J774A.1 and THP-1, show distinct responses to LPS, impacting research outcomes.
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- In vitro cell culture models are crucial for inflammation research.
- Data on the time- and dose-dependency of lipopolysaccharide (LPS)-induced inflammatory responses in cell lines are fragmented.
- Standardizing these parameters is essential for reproducible results.
Purpose of the Study:
- To investigate the time- and dose-dependent inflammatory responses of J774A.1 mouse macrophage and THP-1 human monocyte cell lines to LPS.
- To compare the differential regulation of inflammatory markers between these two cell lines.
- To explore the role of Toll-like receptor 4 (TLR4) in mediating these responses.
Main Methods:
- J774A.1 and THP-1 cells were treated with varying concentrations of LPS (0-500 ng/mL) for different durations (0-24 h).
- Total protein was quantified using SRB and BCA assays.
- Gene expression and protein levels of cytokines were measured using real-time PCR and ELISA, respectively.
- Statistical significance was determined using one-way ANOVA and Tukey's Honestly Significant Difference test.
Main Results:
- Cytokine production in both J774A.1 and THP-1 cells exhibited distinct time- and dose-dependent patterns following LPS stimulation.
- Significant differences in LPS response regulation were observed between the two cell lines.
- These differential responses correlated with variations in messenger RNA (mRNA) levels of TLR4.
Conclusions:
- Temporal and dose-dependent effects of LPS must be carefully controlled in in vitro inflammation studies.
- Extrapolation of mechanistic data between different cell lines requires caution due to potential variations in cellular responses.
- Understanding cell-line specific responses to inflammatory stimuli is critical for accurate interpretation of research findings.
Objective:
In vitro cell culture models are widely used in inflammation research; however, information regarding the time- and dose-dependency of inflammatory responses toward LPS in these cell lines is scattered in the literature.
Material:
J774A.1 mouse macrophage and THP-1 human monocyte cell lines.
Treatment:
J774A.1 and THP-1 cells were treated with 0-500 ng/mL lipopolysaccharide for 0-24 h.
Methods:
SRB and BCA tests were used to measure total protein. Real-time PCR was used to determine gene expression levels, and ELISA was used to assess the protein levels. One-way ANOVA and Tukey's Honestly Significant Difference test were used to test the significance levels.
Results:
In J774A.1 and THP-1 cells, cytokines responded in distinct patterns upon LPS stimulation in a time- and dose-dependent manner, and the differential regulation of the response to LPS between J774A.1 and THP-1 cells appeared to correlate with the differential regulation of TLR4 at the mRNA level.
Conclusion:
In summary, this study indicated that temporal and dose-dependent responses to LPS need to be controlled for and that extrapolation of data on mechanisms may differ between cell lines of different origin.
