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This study looked at interstitial macrophages (IMs) in the lungs during homeostasis and acute lung inflammation induced by lipopolysaccharide (LPS). They found that during homeostasis, IMs can be divided into two subsets based on surface and transcriptional expression of folate receptor β (FRβ), which inhabit distinct niches within the lung interstitium. During acute inflammation, IM numbers expand due to recruitment of monocyte-derived IMs, which comprise two unique subsets defined by expression of genes associated with interferon signaling and glycolytic pathways. FRβ+ IMs are of near-pure resident origin, while FRβ− ΙΜs represent a mixed population of resident and recruited IMs.
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