Targeting cholesterol homeostasis in lung diseases.

Targeting cholesterol homeostasis in lung diseases.
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DOI:
10.1038/s41598-017-10879-w
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发表时间:
2017-08-31
期刊:
影响因子:
4.6
通讯作者:
Trapnell BC
Trapnell BC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sallese A;Suzuki T;McCarthy C;Bridges J;Filuta A;Arumugam P;Shima K;Ma Y;Wessendarp M;Black D;Chalk C;Carey B;Trapnell BC

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Macrophages are critical to organ structure and function in health and disease. To determine mechanisms by which granulocyte/macrophage-colony stimulating factor (GM-CSF) signaling normally maintains surfactant homeostasis and how its disruption causes pulmonary alveolar proteinosis (PAP), we evaluated lipid composition in alveolar macrophages and lung surfactant, macrophage-mediated surfactant clearance kinetics/dynamics, and cholesterol-targeted pharmacotherapy of PAP in vitro and in vivo. Without GM-CSF signaling, surfactant-exposed macrophages massively accumulated cholesterol ester-rich lipid-droplets and surfactant had an increased proportion of cholesterol. GM-CSF regulated cholesterol clearance in macrophages in constitutive, dose-dependent, and reversible fashion but did not affect phospholipid clearance. PPARγ-agonist therapy increased cholesterol clearance in macrophages and reduced disease severity in PAP mice. Results demonstrate that GM-CSF is required for cholesterol clearance in macrophages, identify reduced cholesterol clearance as the primary macrophage defect driving PAP pathogenesis, and support the feasibility of translating pioglitazone as a novel pharmacotherapy of PAP.
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