Macrophages in lung fibrosis
Tatsuro Ogawa1, Shigeyuki Shichino1, Satoshi Ueha1
1Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan.
Abstract:
Pulmonary fibrosis (PF) is a disease in which excessive extracellular matrix (ECM) accumulation occurs in the lungs, which induces thickening of the alveolar walls, ultimately leading to the destruction of alveolar structures and respiratory failure. Idiopathic PF, the cause of which is unknown, has a poor prognosis with a median survival of 2-4 years after diagnosis. There is currently no known curative treatment. The mechanism underlying PF is thought to be initiated by the dysfunction of type II alveolar epithelial cells, which leads to ECM overproduction through the activation of fibroblasts. In addition, it has been suggested that a variety of cells contribute to fibrotic processes. In particular, clinical and basic research findings examining the roles of macrophages suggest that they may be pivotal regulators of PF. In this review, we discuss the characteristics, functions and origins of subsets of macrophages involved in PF, including resident alveolar, interstitial and monocyte-derived macrophages.
Insights
Pulmonary fibrosis (PF) involves lung tissue scarring due to excessive extracellular matrix (ECM). Macrophages are key regulators in this fibrotic disease, influencing its progression and severity.
Area of Science:
- Pulmonary Medicine
- Immunology
- Cell Biology
Background:
- Pulmonary fibrosis (PF) is characterized by lung extracellular matrix (ECM) accumulation, leading to alveolar destruction and respiratory failure.
- Idiopathic PF has a poor prognosis, with no current curative treatments available.
- The disease mechanism is linked to alveolar epithelial cell dysfunction and fibroblast activation, with emerging evidence highlighting the role of various cell types.
Purpose of the Study:
- To review the characteristics, functions, and origins of macrophage subsets implicated in pulmonary fibrosis.
- To elucidate the pivotal regulatory roles macrophages may play in the pathogenesis of PF.
Main Methods:
- Literature review of clinical and basic research findings.
- Analysis of studies investigating macrophage subsets in PF.
- Discussion of macrophage origins (resident alveolar, interstitial, monocyte-derived).
Main Results:
- Macrophages are suggested to be pivotal regulators in pulmonary fibrosis.
- Different subsets of macrophages (resident alveolar, interstitial, monocyte-derived) are involved in the fibrotic process.
- Understanding macrophage subsets is crucial for comprehending PF mechanisms.
Conclusions:
- Macrophages, through their diverse subsets, are critical players in the development and progression of pulmonary fibrosis.
- Further research into macrophage roles may uncover novel therapeutic targets for PF.
- Targeting specific macrophage populations could offer a potential treatment strategy for this debilitating lung disease.
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