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Alveolar Macrophage Phagocytosis and Bacteria Clearance in Mice
Published on: March 2, 2019
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Macrophages clean up: efferocytosis and microbial control
Constance J Martin1, Kristen N Peters2, Samuel M Behar2
1Department of Immunology & Infectious Diseases, Harvard School of Public Health, Boston, MA 02115, United States.
Current Opinion in Microbiology
|March 4, 2014
Summary
Efferocytosis, the engulfment of apoptotic cells, plays a dual role in immunity. While clearing pathogens like influenza, it can also promote infections, highlighting a need for targeted immunotherapies.
Area of Science:
- Immunology
- Cell Biology
- Microbial Pathogenesis
Background:
- Phagocytic leukocytes, such as macrophages, clear pathogens and apoptotic host cells through efferocytosis.
- Efferocytosis is recognized for its role in resolving inflammation.
- Emerging evidence suggests efferocytosis has a complex, context-dependent role in microbial immunity.
Purpose of the Study:
- To investigate the dual role of efferocytosis in microbial immunity.
- To understand how immune cells process pathogens within apoptotic cells.
- To identify potential therapeutic targets for combined anti-inflammatory and anti-pathogen strategies.
Main Methods:
- Review of existing literature on efferocytosis and microbial immunity.
- Analysis of studies involving efferocytosis of influenza, Mycobacterium tuberculosis, and Leishmania-infected cells.
- Exploration of the mechanisms by which macrophages, dendritic cells (DCs), and neutrophils handle engulfed pathogens.
Main Results:
- Efferocytosis can lead to pathogen destruction (e.g., influenza, M. tuberculosis).
- Efferocytosis can also promote infection (e.g., Leishmania-infected neutrophils).
- Immune cells process pathogens differently when they are within apoptotic cells.
Conclusions:
- Efferocytosis presents a "double-edged sword" in microbial immunity.
- Understanding these differential outcomes is crucial for developing new treatments.
- Targeting efferocytosis pathways could offer novel therapeutic approaches for inflammatory and infectious diseases.
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