Marius Hittinger, Nico Alexander Mell, Hanno Huwer, Brigitta Loretz, Nicole Schneider-Daum and Claus-Michael Lehr
Acute respiratory distress syndrome is linked to inflammatory processes in the human lung. The aim of this study was to mimic in vitro the treatment of lung inflammation by using a cell-based human autologous co-culture model. As a potential trial medication, we developed a pulmonary dry powder formulation loaded with interleukin-10 (IL-10), a potent anti-inflammatory cytokine. The inflammatory immune response was stimulated by lipopolysaccharide. The co-culture was combined with the Pharmaceutical Aerosol Deposition Device on Cell Cultures )PADDOCC), to deposit the IL-10-loaded microparticles on the inflamed co-culture model at the air-liquid interface. This treatment significantly reduced the secretion of interleukin-6 and tumour necrosis factor, as compared to the deposition of placebo (unloaded) particles. Our results show that the alveolar co-culture model, in combination with a deposition device such as the PADDOCC, may serve as a powerful tool for testing the safety and efficacy of dry powder formulations for pulmonary drug delivery.