The Biological Role of Macrophage in Lung and Its Implications in Lung Cancer Immunotherapy

Author:

Wang Chenyang1,Gao Qing1,Wu Jinghong1,Lu Mingjun1,Wang Jinghui1,Ma Teng1ORCID

Affiliation:

1. Cancer Research Center Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing Chest Hospital Capital Medical University Beijing 101149 China

Abstract

AbstractThe lungs are the largest surface of the body and the most important organ in the respiratory system, which are constantly exposed to the external environment. Tissue Resident Macrophages in lung constitutes the important defense against external pathogens. Macrophages connects the innate and adaptive immune system, and also plays important roles in carcinogenesis and cancer immunotherapy. Lung cancer is the leading cause of cancer‐related death worldwide, with an overall five‐year survival rate of only 21%. Macrophages that infiltrate or aggregate in lung tumor microenvironment are defined as tumor‐associated macrophages (TAMs). TAMs are the main components of immune cells in the lung tumor microenvironment. The differentiation and maturation process of TAMs can be roughly divided into two different types: classical activation pathway produces M1 tumor‐associated macrophages, and bypass activation pathway produces M2 tumor‐associated macrophages. Studies have found that TAMs are related to tumor invasion, metastasis, and treatment resistance, and show potential as a new target for tumor immunotherapy. Therefore, the biological function of macrophages in lung and the role of TAMs in the occurrence, development, and treatment of lung cancer are discussed in this paper.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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