Alveolar macrophages are the resident phagocytic immune cells of the lung's air spaces, positioned at the interface between inhaled air and the delicate alveolar surface. As the first line of innate cellular defense in the distal lung, they recognize, engulf, and destroy inhaled microorganisms, particulates, and cel…
Alveolar macrophages are the resident phagocytic immune cells of the lung's air spaces, positioned at the interface between inhaled air and the delicate alveolar surface. As the first line of innate cellular defense in the distal lung, they recognize, engulf, and destroy inhaled microorganisms, particulates, and cellular debris, helping to keep the alveoli sterile and clear. Beyond phagocytosis, they orchestrate pulmonary immune responses by secreting cytokines and chemokines that recruit and regulate other leukocytes, and they maintain tissue homeostasis through the clearance of apoptotic cells and the turnover of surfactant. Their function is intimately linked to the alveolar microenvironment, including the surfactant proteins; variation in surfactant protein A isoforms, for instance, is reflected in measurable differences in the alveolar macrophage proteome, underscoring how the local milieu shapes macrophage phenotype. Alveolar macrophages are commonly sampled and studied through bronchoalveolar lavage, which recovers cells from the airspaces and reveals changes in their number and morphology during infection, such as mycoplasma pneumonia. They are also central to the pathophysiology of inflammatory and infectious lung disease, contributing both to protective immunity and, when dysregulated, to tissue injury, as in the leukocyte recruitment and lung damage observed in severe viral infection. Their plasticity and pivotal location make alveolar macrophages key determinants of respiratory health and disease.
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The 8 articles above have been cited 52 times in the scholarly literature. Citation data via OpenAlex and Crossref, updated Jun 2026.
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