Surfactant protein-B supplementation improves in vivo function of a modified natural surfactant.
The effect of the addition of surfactant protein (SP)-B or SP-B plus SP-C (SP-BC) to a surfactant made from bovine lung (Survanta) was evaluated in 27-d-gestation preterm rabbits. The animals were treated with Survanta, Survanta + 2% SP-B, Survanta + 3% SP-BC, or sheep surfactant. They were then ventilated with 3 cm H2O positive end-expiratory pressure and tidal volumes of 8 mL/kg. Survanta + 2% SP-B was prepared by adding SP-B in water to Survanta or by adding SP-B in chloroform [SP-B(Chl)] to lipid-extracted Survanta. Dynamic compliances of the Survanta + 2% SP-B(Chl)- and Survanta + 3% SP-BC-treated rabbits were greater (p < 0.05) than those treated with Survanta or Survanta + 2% SP-B in water and were comparable to sheep surfactant. Postventilation pressure-volume curves for the groups treated with Survanta supplemented with SP-B had significantly larger retained volumes on deflation compared with those treated only with Survanta (p < 0.01). The effects of ventilation style on the responses were assessed by ventilating other groups of rabbits treated with Survanta, Survanta + 0.5% SP-B(Chl), Survanta + 2% SP-B(Chl), or sheep surfactant with tidal volumes of 10 mL/kg and 0 cm H2O positive end-expiratory pressure. SP-B (2%) augmented the in vivo function of Survanta without positive end-expiratory pressure, and 0.5% SP-B had no effect. Infasurf, a surfactant with more SP-B, was more effective than Survanta when tested in the preterm rabbits. SP-B is a critical factor for optimum immediate surfactant function.
Mizuno
K
K
Department of Pediatrics, Harbor-UCLA Medical Center, UCLA School of Medicine, Torrance 90509, USA.
Ikegami
M
M
Chen
C M
CM
Ueda
T
T
Jobe
A H
AH
D000818:Animals; D001688:Biological Products; D002417:Cattle; D011175:Positive-Pressure Respiration; D011510:Proteolipids / Q000627:therapeutic use*; D011663:Pulmonary Surfactants / Q000502:physiology* / Q000627:therapeutic use*; D011817:Rabbits
D001688:Biological Products; D011510:Proteolipids; D011663:Pulmonary Surfactants; C072197:beractant