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Mapping Lung Hematopoietic Progenitors: Developmental Kinetics and Response to Influenza A Infection.
The bone marrow is a specialised niche responsible for the maintenance of hematopoietic stem and progenitor cells during homeostasis and inflammation. Recent studies however have extended this essential role to the extramedullary and extravascular lung microenvironment. Here, we provide further evidence for a reservoir of hematopoietic stem and progenitor cells within the lung from embryonic day 18.5 until adulthood. These lung progenitors display distinct microenvironment-specific developmental kinetics compared to their bone marrow counterparts, exemplified by a rapid shift from a common myeloid to megakaryocyte-erythrocyte progenitor dominated niche with increasing age. In adult mice, Influenza A viral infection results in a transient reduction in multipotent progenitors within the lungs, with a parallel increase in downstream granulocyte-macrophage progenitors and dendritic cell populations associated with acute viral infections. Our findings suggest lung hematopoietic progenitors play a role in re-establishing immunological homeostasis in the respiratory mucosa, which may have significant clinical implications for maintaining pulmonary health following inflammatory perturbation.
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