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Component-specific surface and physiological activity in bovine-derived lung surfactants
Robert H Notter1, Z Wang, E A Egan
1Department of Pediatrics (Neonatology, Box 777), University of Rochester School of Medicine, 601 Elmwood Avenue, Rochester, NY 14642, USA.
Chemistry and Physics of Lipids
|February 14, 2002
Summary
Surfactant protein B (SP-B) is crucial for lung surfactant efficacy. Higher SP-B levels in Infasurf improved its surface activity and pressure-volume mechanics compared to Survanta, highlighting SP-B
Area of Science:
- Pulmonary Medicine
- Biochemistry
- Biophysics
Background:
- Lung surfactant is essential for maintaining alveolar stability and function.
- Exogenous surfactants are used clinically to treat respiratory distress syndrome.
- Variations in surfactant composition, particularly protein content, may affect efficacy.
Purpose of the Study:
- To compare the composition, surface activity, and pressure-volume (P-V) mechanics of lavaged calf lung surfactant (LS) with two clinical exogenous surfactants, Infasurf and Survanta.
- To investigate the role of surfactant protein B (SP-B) in the functional differences observed between these surfactants.
Main Methods:
- Compositional analysis of phospholipids, neutral lipids, and proteins (including SP-B quantification via ELISA).
- Assessment of surface activity using adsorption and dynamic surface tension measurements.
- Evaluation of P-V mechanics in surfactant-deficient models.
- Functional studies involving the addition of purified bovine SP-B to Survanta.
Main Results:
- Lavaged LS and Infasurf exhibited similar phospholipid and neutral lipid compositions.
- Survanta showed higher levels of free fatty acids and triglycerides.
- Infasurf contained significantly more SP-B relative to phospholipids than Survanta.
- SP-B was identified as a key factor in the superior adsorption, dynamic surface activity, and P-V mechanical effects of Infasurf.
- Addition of 0.7% SP-B to Survanta restored its surface and P-V mechanical properties to levels comparable to Infasurf.
Conclusions:
- Surfactant protein B (SP-B) content is a critical determinant of lung surfactant's surface activity and efficacy in improving pulmonary mechanics.
- The lower SP-B concentration in Survanta contributes to its reduced effectiveness compared to Infasurf and natural lung surfactant.
- Optimizing SP-B levels in exogenous surfactants may enhance their therapeutic potential for surfactant-deficient conditions.