Isolation of murine peritoneal macrophages to carry out gene expression analysis upon Toll-like receptors stimulation
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Updated: Apr 12, 2026
Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
Published on: April 29, 2015
Antonio Layoun1, Macha Samba2, Manuela M Santos3
1Centre de recherche du Centre hospitalier de l'Université de Montréal, Institut du cancer de Montréal; antonio.layoun@umontreal.ca.
Abstract:
During infection and inflammation, circulating monocytes leave the bloodstream and migrate into tissues, where they differentiate into macrophages. Macrophages express surface Toll-like receptors (TLRs), which recognize molecular patterns conserved through evolution in a wide range of microorganisms. TLRs play a central role in macrophage activation which is usually associated with gene expression alteration. Macrophages are critical in many diseases and have emerged as attractive targets for therapy. In the following protocol, we describe a procedure to isolate murine peritoneal macrophages using Brewer's thioglycollate medium. The latter will boost monocyte migration into the peritoneum, accordingly this will raise macrophage yield by 10-fold. Several studies have been carried out using bone marrow, spleen or peritoneal derived macrophages. However, peritoneal macrophages were shown to be more mature upon isolation and are more stable in their functionality and phenotype. Thus, macrophages isolated from murine peritoneal cavity present an important cell population that can serve in different immunological and metabolic studies. Once isolated, macrophages were stimulated with different TLR ligands and consequently gene expression was evaluated.
Insights
This study details a method for isolating murine peritoneal macrophages, crucial immune cells that activate via Toll-like receptors (TLRs). This protocol significantly increases macrophage yield for immunological and metabolic research.
Area of Science:
- Immunology
- Cell Biology
Background:
- Macrophages are key immune cells involved in infection, inflammation, and disease.
- Toll-like receptors (TLRs) on macrophages recognize microbial patterns, initiating immune responses and altering gene expression.
- Macrophages are important therapeutic targets due to their critical role in various diseases.
Purpose of the Study:
- To describe a protocol for isolating murine peritoneal macrophages.
- To enhance macrophage yield for immunological and metabolic studies.
- To investigate gene expression changes in macrophages following Toll-like receptor (TLR) stimulation.
Main Methods:
- Isolation of murine peritoneal macrophages using Brewer's thioglycollate medium to enhance monocyte recruitment.
- Stimulation of isolated macrophages with various Toll-like receptor (TLR) ligands.
- Evaluation of gene expression changes post-stimulation.
Main Results:
- Brewer's thioglycollate medium administration resulted in a 10-fold increase in peritoneal macrophage yield.
- Peritoneal macrophages demonstrated greater maturity, stability, and consistent functionality compared to other sources.
- TLR stimulation led to measurable alterations in macrophage gene expression.
Conclusions:
- The described protocol provides an efficient method for isolating a high yield of mature and stable murine peritoneal macrophages.
- These macrophages are a valuable resource for immunological and metabolic research, particularly for studying TLR-mediated responses.
- The protocol facilitates the investigation of gene expression dynamics in activated macrophages.
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