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Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
Published on: April 29, 2015
Phenotypic and functional analysis of murine resident and induced peritoneal macrophages
Lyubomyr R Turchyn1, Theodore J Baginski, Richard R Renkiewicz
1Department of Comparative Medicine, Pfizer Global Research and Development, Ann Arbor, MI, USA. compdvm@yahoo.com
Abstract:
Primary macrophages from the peritoneal cavities of mice are commonly used ex vivo to produce inflammatory cytokines and test anti-inflammatory agents. Although approximately 1 million peritoneal macrophages can be obtained from an untreated mouse, more than twice that number can be collected 48 to 72 h after intraperitoneal injection of sterile inducing agents such as Brewer thioglycollate broth, casein, and proteose peptone. However, whether 'induced' macrophages are functionally equivalent to 'resident' peritoneal macrophages has been unclear. Flow cytometric analysis revealed significant phenotypic differences between these 2 macrophage types. Resident and induced peritoneal macrophages also demonstrated markedly different capacities to produce the inflammatory cytokines interleukins 6 and 1beta in response to lipopolysaccharide stimulation in vitro. Increased understanding of the differences between resident and induced peritoneal macrophages likely will help investigators decide which macrophage type is appropriate for their in vitro assay needs.
Insights
Induced and resident peritoneal macrophages exhibit distinct phenotypes and cytokine production capabilities. Understanding these differences is crucial for selecting appropriate macrophage types for in vitro immunological assays.
Area of Science:
- Immunology
- Cell Biology
Background:
- Primary macrophages from mouse peritoneal cavities are widely used for cytokine production and anti-inflammatory drug testing.
- While inducing agents increase macrophage yield, the functional equivalence of induced versus resident macrophages remains unclear.
Purpose of the Study:
- To investigate the phenotypic and functional differences between resident and induced peritoneal macrophages.
- To clarify the suitability of each macrophage type for specific in vitro immunological research.
Main Methods:
- Flow cytometry was used to analyze macrophage phenotypes.
- In vitro lipopolysaccharide stimulation was employed to assess cytokine production (interleukins 6 and 1beta).
Main Results:
- Significant phenotypic differences were observed between resident and induced peritoneal macrophages.
- Induced macrophages showed markedly different capacities for producing inflammatory cytokines compared to resident macrophages upon lipopolysaccharide stimulation.
Conclusions:
- Resident and induced peritoneal macrophages are not functionally equivalent.
- Knowledge of these distinct characteristics aids researchers in choosing the appropriate macrophage population for their specific in vitro experimental needs.
