Resetting proteostasis with ISRIB prevents pulmonary fibrosis
Watanabe, S.; Markov, N. S.; Lu, Z.; Piseaux Aillon, R.; Soberanes, S.; Runyan, C. E.; Ren, Z.; Grant, R. A.; Maciel, M.; Abdala-Valencia, H.; Politanska, Y.; Nam, K.; Sichizya, L.; Kihshen, H. G.; Joshi, N.; McQuattie-Pimentel, A. C.; Morimoto, R. I.; Reyfman, P. A.; Budinger, G. S.; Misharin, A. V.
Show abstract
Aging is among the most important risk factors for the development of pulmonary fibrosis. We found that a small molecule that specifically inhibits translational inhibition induced by activation of the integrated stress response (ISRIB) attenuated the severity of pulmonary fibrosis in young and old mice. The more severe fibrosis in old compared to young mice was associated with increased recruitment of pathogenic monocyte-derived alveolar macrophages. Using genetic lineage tracing and transcriptomic profiling we found that ISRIB modulates stress response signaling in alveolar epithelial cells resulting in decreased apoptosis and decreased recruitment of pathogenic monocyte-derived alveolar macrophages. These data support multicellular model of fibrosis involving epithelial cells, pathogenic monocyte-derived alveolar macrophages and fibroblasts. Inhibition of the integrated stress response in the aging lung epithelium ameliorates pulmonary fibrosis by preventing the prolonged recruitment of monocyte-derived alveolar macrophages.
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