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Updated: Nov 12, 2025
Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
Published on: April 29, 2015
Recruited macrophages that colonize the post-inflammatory peritoneal niche convert into functionally divergent
P A Louwe1, L Badiola Gomez1, H Webster2
1Centre for Inflammation Research, Queens Medical Research Institute, Edinburgh, EH16 4TJ, United Kingdom.
Abstract:
Inflammation generally leads to recruitment of monocyte-derived macrophages. What regulates the fate of these cells and to what extent they can assume the identity and function of resident macrophages is unclear. Here, we show that macrophages elicited into the peritoneal cavity during mild inflammation persist long-term but are retained in an immature transitory state of differentiation due to the presence of enduring resident macrophages. By contrast, severe inflammation results in ablation of resident macrophages and a protracted phase wherein the cavity is incapable of sustaining a resident phenotype, yet ultimately elicited cells acquire a mature resident identity. These macrophages also have transcriptionally and functionally divergent features that result from inflammation-driven alterations to the peritoneal cavity micro-environment and, to a lesser extent, effects of origin and time-of-residency. Hence, rather than being predetermined, the fate of inflammation-elicited peritoneal macrophages seems to be regulated by the environment.
Insights
The environment, not genetics, dictates the fate of inflammation-elicited macrophages. Mild inflammation leads to immature macrophages, while severe inflammation promotes mature resident macrophage identity.
Area of Science:
- Immunology
- Cell Biology
- Tissue Microenvironment Dynamics
Background:
- Inflammation recruits monocyte-derived macrophages, but their differentiation and functional fate remain unclear.
- The role of resident macrophages in regulating the identity of incoming inflammatory macrophages is not well understood.
Purpose of the Study:
- To investigate the factors regulating the fate and identity acquisition of inflammation-elicited macrophages in the peritoneal cavity.
- To determine the influence of inflammation severity and the resident macrophage population on elicited macrophage differentiation.
Main Methods:
- Induction of mild and severe inflammation in the peritoneal cavity.
- Long-term tracking and characterization of elicited macrophage populations.
- Analysis of transcriptional and functional profiles of macrophages.
- Assessment of the peritoneal cavity micro-environment.
Main Results:
- Mild inflammation leads to persistent, immature elicited macrophages due to the presence of resident macrophages.
- Severe inflammation causes resident macrophage ablation, followed by elicited cells acquiring a mature resident identity.
- Inflammation-driven micro-environmental changes significantly impact macrophage phenotype and function.
Conclusions:
- Macrophage fate is not predetermined but is dynamically regulated by the peritoneal cavity micro-environment.
- The severity of inflammation and the status of resident macrophages critically influence elicited macrophage differentiation.
- Environmental cues play a dominant role in shaping the identity and function of peritoneal macrophages.
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