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Updated: May 1, 2026

Bone Marrow-derived Macrophage Production
Published on: November 22, 2013
Inflammatory response of macrophages in infection
1Department of Anesthesiology, Changzhen Hospital, Second Military Medical University, Shanghai 200003, China. wangchengcai81@sina.com.
Background:
Macrophages are widely-distributed innate immune cells playing diverse roles in various physiological and pathological processes. The primary function of macrophages is to phagocytize and clear invading pathogens.
Data Sources:
A systematic search of PubMed was performed to identify relevant studies in English language literature using the key words such as macrophage and inflammation. A total of 122 articles related to inflammatory response of macrophages in infection were systematically reviewed.
Results:
The inflammatory responses of macrophages triggered by infection comprise four interrelated phases: recognition of pathogen-associated molecular patterns by pattern-recognition receptors expressed on/in macrophages; enrichment of quantity of macrophages in local infected tissue by recruitment of circulating monocytes and/or in situ proliferation; macrophage-mediation of microbicidal activity and conversion to anti-inflammatory phenotype to terminate anti-infectious response and to promote tissue repair. Complicated regulation of macrophage activation at molecular level recognized in the past decade is also reviewed, including intracellular multiple signaling molecules, membrane molecules, microRNAs and even epigenetic-associated molecules.
Conclusion:
The inflammatory response of macrophages in infection is an orderly and complicated process under elaborate regulation at molecular level.
Insights
Macrophages are key innate immune cells that clear pathogens. Their inflammatory response to infection involves recognition, recruitment, microbicidal activity, and repair, all under complex molecular regulation.
Area of Science:
- Immunology
- Cell Biology
Background:
- Macrophages are crucial innate immune cells involved in numerous physiological and pathological processes.
- Their primary role is the phagocytosis and elimination of invading pathogens.
Purpose of the Study:
- To systematically review the inflammatory response of macrophages during infection.
- To explore the molecular mechanisms regulating macrophage activation.
Main Methods:
- A systematic literature search of PubMed was conducted.
- 122 articles on macrophage inflammatory responses in infection were reviewed.
Main Results:
- Macrophage inflammatory responses to infection involve pathogen recognition, cell recruitment/proliferation, microbicidal activity, and transition to an anti-inflammatory phenotype for tissue repair.
- Recent discoveries highlight complex molecular regulation, including signaling molecules, membrane proteins, microRNAs, and epigenetic factors.
Conclusions:
- The inflammatory response of macrophages during infection is a complex, ordered process.
- This response is intricately regulated at the molecular level.
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