PT - JOURNAL ARTICLE AU - Mareike Lehmann AU - Martina Korfei AU - Kathrin Mutze AU - Stephan Klee AU - Wioletta Skronska-Wasek AU - Hani N. Alsafadi AU - Chiharu Ota AU - Rita Costa AU - Herbert B. Schiller AU - Michael Lindner AU - Darcy E. Wagner AU - Andreas Günther AU - Melanie Königshoff TI - Senolytic drugs target alveolar epithelial cell function and attenuate experimental lung fibrosis <em>ex vivo</em> AID - 10.1183/13993003.02367-2016 DP - 2017 Aug 01 TA - European Respiratory Journal PG - 1602367 VI - 50 IP - 2 4099 - http://erj.ersjournals.com/content/50/2/1602367.short 4100 - http://erj.ersjournals.com/content/50/2/1602367.full SO - Eur Respir J2017 Aug 01; 50 AB - Idiopathic pulmonary fibrosis (IPF) is a devastating lung disease with poor prognosis and limited therapeutic options. The incidence of IPF increases with age, and ageing-related mechanisms such as cellular senescence have been proposed as pathogenic drivers. The lung alveolar epithelium represents a major site of tissue injury in IPF and senescence of this cell population is probably detrimental to lung repair. However, the potential pathomechanisms of alveolar epithelial cell senescence and the impact of senolytic drugs on senescent lung cells and fibrosis remain unknown. Here we demonstrate that lung epithelial cells exhibit increased P16 and P21 expression as well as senescence-associated β-galactosidase activity in experimental and human lung fibrosis tissue and primary cells.Primary fibrotic mouse alveolar epithelial type (AT)II cells secreted increased amounts of senescence-associated secretory phenotype (SASP) factors in vitro, as analysed using quantitative PCR, mass spectrometry and ELISA. Importantly, pharmacological clearance of senescent cells by induction of apoptosis in fibrotic ATII cells or ex vivo three-dimensional lung tissue cultures reduced SASP factors and extracellular matrix markers, while increasing alveolar epithelial markers.These data indicate that alveolar epithelial cell senescence contributes to lung fibrosis development and that senolytic drugs may be a viable therapeutic option for IPF.Alveolar epithelial cell senescence occurs in IPF and senolytic treatment attenuates experimental lung fibrosis http://ow.ly/nFlz30bsmNm