In this study, the investigators aim to observe the change in alveolar macrophage function during acute lung injury.
Alveolar macrophages are tissue-resident or recruited cells with key functions in recognition of pathogens, initiation of host defensive ang protective inflammation,and in clearance of pathogens from the airways. However, macrophages are also responsible for efficient clearance of apoptotic neutrophils, termed efferocytosis, which is a prerequisite for the timely resolution of inflammation. In this study, the investigators aim to observe the change in alveolar macrophage function during acute lung injury.
Study Type
OBSERVATIONAL
Enrollment
25
Bronchoscopy will be implemented under sedation in both groups.
alveolar macrophages (AMs) phagocytic index
AMs will be collected and cultured in vitro. Apoptotic neutrophils will then be cocultured with AMs for 1 hour. To measure phagocytosis of apoptotic neutrophils, AMs were further processed and phagocytosed apoptotic neutrophils were detected by confocal fluorescence microscopy as described below under Cell staining and confocal microscopy. The phagocytic index was calculated according to the following formula: phagocytic index = (total number of engulfed cells/total number of counted macrophages) × (number of macrophages containing engulfed cells/total number of counted macrophages) × 100.
Time frame: 7 days after admission
30 days mortality
Time frame: 30 days after admission
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