BACKGROUND: Pulmonary surfactant provides an alveolar surface-active film that is critical for normal lung function. Our objective was to determine in vitro film formation properties of therapeutic and infant surfactants and the influence of surfactant protein (SP)-B content. METHODS: We used a multiwell fluorescent assay measuring maximum phospholipid surface accumulation (Max), phospholipid concentration required for half-maximal film formation (½Max), and time for maximal accumulation (tMax). RESULTS: Among five therapeutic surfactants, calfactant (highest SP-B content) had film formation values similar to natural surfactant, and addition of SP-B to beractant (lowest SP-B) normalized its Max value. Addition of budesonide to calfactant did not adversely affect film formation. In tracheal aspirates of preterm infants with evolving chronic lung disease, SP-B content correlated with ½Max and tMax values, and SP-B supplementation of SP-B-deficient infant surfactant restored normal film formation. Reconstitution of normal surfactant indicated a role for both SP-B and SP-C in film formation. CONCLUSION: Film formation in vitro differs among therapeutic surfactants and is highly dependent on SP-B content in infant surfactant. The results support a critical role of SP-B for promoting surface film formation.
BACKGROUND: Pulmonary surfactant provides an alveolar surface-active film that is critical for normal lung function. Our objective was to determine in vitro film formation properties of therapeutic and infant surfactants and the influence of surfactant protein (SP)-B content. METHODS: We used a multiwell fluorescent assay measuring maximum phospholipid surface accumulation (Max), phospholipid concentration required for half-maximal film formation (½Max), and time for maximal accumulation (tMax). RESULTS: Among five therapeutic surfactants, calfactant (highest SP-B content) had film formation values similar to natural surfactant, and addition of SP-B to beractant (lowest SP-B) normalized its Max value. Addition of budesonide to calfactant did not adversely affect film formation. In tracheal aspirates of preterm infants with evolving chronic lung disease, SP-B content correlated with ½Max and tMax values, and SP-B supplementation of SP-B-deficient infant surfactant restored normal film formation. Reconstitution of normal surfactant indicated a role for both SP-B and SP-C in film formation. CONCLUSION: Film formation in vitro differs among therapeutic surfactants and is highly dependent on SP-B content in infant surfactant. The results support a critical role of SP-B for promoting surface film formation.
Authors: Tsu F Yeh; Hong C Lin; Chien H Chang; Tien S Wu; Bai H Su; Tsai C Li; Suma Pyati; Chang H Tsai Journal: Pediatrics Date: 2008-04-21 Impact factor: 7.124
Authors: Anne Marie Barrette; Jessica K Roberts; Cheryl Chapin; Edmund A Egan; Mark R Segal; Juan A Oses-Prieto; Shreya Chand; Alma L Burlingame; Philip L Ballard Journal: Am J Respir Cell Mol Biol Date: 2016-11 Impact factor: 6.914
Authors: Tamara L Paget; Emma J Parkinson-Lawrence; Paul J Trim; Chiara Autilio; Madhuriben H Panchal; Grielof Koster; Mercedes Echaide; Marten F Snel; Anthony D Postle; Janna L Morrison; Jésus Pérez-Gil; Sandra Orgeig Journal: Cells Date: 2021-04-08 Impact factor: 6.600