Polymer Lung Surfactants

Animal-derived lung surfactants annually save 40 000 infants with neonatal respiratory distress syndrome (NRDS) in the United States. Lung surfactants have further potential for treating about 190 000 adult patients with acute respiratory distress syndrome (ARDS) each year. To this end, the properties of current therapeutics need to be modified. Although the limitations of current therapeutics have been recognized since the 1990s, there has been little improvement. To address this gap, our laboratory has been exploring a radically different approach in which, instead of lipids, proteins, or peptides, synthetic polymers are used as the active ingredient. This endeavor has led to an identification of a promising polymer-based lung surfactant candidate, poly­(styrene-b-ethylene glycol) (PS–PEG) polymer nanomicelles. PS–PEG micelles produce extremely low surface tension under high compression because PS–PEG micelles have a strong affinity to the air–water interface. NMR measurements support that PS–PEG micelles are less hydrated than ordinary polymer micelles. Studies using mouse models of acid aspiration confirm that PS–PEG lung surfactant is safe and efficacious