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Updated: Mar 6, 2026
Isolation and In Vitro Culture of Murine and Human Alveolar Macrophages
Published on: April 20, 2018
Location, function, and ontogeny of pulmonary macrophages during the steady state
Natalio Garbi1, Bart N Lambrecht2,3,4
1Department of Molecular Immunology, Institute of Experimental Immunology, University of Bonn, Bonn, Germany. ngarbi@uni-bonn.de.
Abstract:
The lung is continuously exposed to potentially hazardous environmental challenges in the form of inert material and microbes. Pulmonary macrophages are critical in maintaining a low inflammatory context in the lung to facilitate optimal gas exchange. During infection, however, they mediate the immediate response to invading microorganisms in coordination with epithelial cells and other tissue-resident immune cells including dendritic cells, innate lymphocytes and memory T cells, and pulmonary interstitial macrophages. The balance between pulmonary Mø inhibition and activation is regulated by a complex set of receptors whose activation determines whether macrophages remain quiescent or undergo cellular activation. In addition, pulmonary macrophages perform tissue-specific functions such as surfactant catabolism necessary to prevent alveolar proteinosis and interstitial lung disease. This review summarizes current knowledge on different pulmonary macrophage types with an emphasis on their location, function, and available experimental models to manipulate them. Finally, we review recent developments on the dynamic ontogeny of pulmonary macrophages and how it may affect age-related diseases.
Insights
Pulmonary macrophages maintain lung health and respond to infection. This review details macrophage types, functions, and their role in age-related lung diseases.
Area of Science:
- Immunology
- Pulmonology
- Cell Biology
Background:
- The lung faces constant environmental threats from microbes and inert materials.
- Pulmonary macrophages are key to low-inflammation lung environments, essential for gas exchange.
- During infection, they coordinate immune responses with other lung cells.
Purpose of the Study:
- To review pulmonary macrophage types, locations, and functions.
- To discuss experimental models for manipulating pulmonary macrophages.
- To explore the ontogeny of pulmonary macrophages and its link to age-related diseases.
Main Methods:
- Literature review of current knowledge on pulmonary macrophages.
- Analysis of receptor-mediated regulation of macrophage activation and inhibition.
- Examination of tissue-specific macrophage functions, like surfactant catabolism.
Main Results:
- Pulmonary macrophages have diverse types with distinct locations and functions.
- Receptor signaling critically regulates macrophage quiescence versus activation.
- Macrophages perform vital tissue-specific roles, preventing lung diseases.
Conclusions:
- Understanding pulmonary macrophage heterogeneity is crucial for lung health.
- Ontogeny and age-related changes in macrophages impact lung disease susceptibility.
- Further research into macrophage manipulation holds therapeutic potential.
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