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Int. J. Mol. Sci. 2018, 19(2), 582; doi:10.3390/ijms19020582

Lung Macrophage Phenotypes and Functional Responses: Role in the Pathogenesis of COPD

Centre for Heart Lung Innovation, Department of Medicine, University of British Columbia, Vancouver, BC V6Z1Y6, Canada
Author to whom correspondence should be addressed.
Received: 15 January 2018 / Revised: 7 February 2018 / Accepted: 10 February 2018 / Published: 15 February 2018
(This article belongs to the Special Issue Macrophages in Inflammation)
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Lung macrophages (LMs) are essential immune effector cells that are pivotal in both innate and adaptive immune responses to inhaled foreign matter. They either reside within the airways and lung tissues (from early life) or are derived from blood monocytes. Similar to macrophages in other organs and tissues, LMs have natural plasticity and can change phenotype and function depending largely on the microenvironment they reside in. Phenotype changes in lung tissue macrophages have been implicated in chronic inflammatory responses and disease progression of various chronic lung diseases, including Chronic Obstructive Pulmonary Disease (COPD). LMs have a wide variety of functional properties that include phagocytosis (inorganic particulate matter and organic particles, such as viruses/bacteria/fungi), the processing of phagocytosed material, and the production of signaling mediators. Functioning as janitors of the airways, they also play a key role in removing dead and dying cells, as well as cell debris (efferocytic functions). We herein review changes in LM phenotypes during chronic lung disease, focusing on COPD, as well as changes in their functional properties as a result of such shifts. Targeting molecular pathways involved in LM phenotypic shifts could potentially allow for future targeted therapeutic interventions in several diseases, such as COPD. View Full-Text
Keywords: lung macrophage phenotypes; chronic obstructive pulmonary disease; phagocytic function of macrophage lung macrophage phenotypes; chronic obstructive pulmonary disease; phagocytic function of macrophage

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yamasaki, K.; Eeden, S.F. Lung Macrophage Phenotypes and Functional Responses: Role in the Pathogenesis of COPD. Int. J. Mol. Sci. 2018, 19, 582.

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