Mapping idiopathic pulmonary fibrosis: how cellular niches fuel pathogenic plasma cell accumulation

Extract Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease that transforms lung tissue into a landscape of pathological scarring and damaged alveoli. However, the mechanisms linking immune responses to fibrosis remain shrouded in mystery. Combining cutting-edge spatial transcriptomics and single-cell RNA sequencing (scRNA-seq) followed by RNA-scope and immunofluorescence validations, the study by Yang et al. [1] published in this issue of the European Respiratory Journal underscores a prominent presence of tertiary lymphoid structure (TLS)-generating plasma cells in end-stage IPF lungs. It uncovers the spatial dynamics of antibody-producing plasma cells, the intricate architecture of TLS, and novel cellular players and molecular pathways that fuel antibody accumulation and drive fibrosis. The authors identified unique subsets of mural cells and specialised fibroblasts, which create niches fostering plasma cell accumulation and antibody production.