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. 1991 Jan;138(1):195–202.

Effects of smoke inhalation on surfactant phospholipids and phospholipase A2 activity in the mouse lung.

M Oulton 1, H K Moores 1, J E Scott 1, D T Janigan 1, R Hajela 1
PMCID: PMC1886049  PMID: 1987765

Abstract

The effects of smoke inhalation on the pulmonary surfactant system were examined in mice exposed for 30 minutes to smoke generated from the burning of polyurethane foam. At 8 or 12 hours after exposure, surfactants were isolated separately from lung lavage (extracellular surfactant) and residual lung tissue (intracellular surfactant) for phospholipid analysis. Calcium-dependent phospholipase A2 (PLA2) was measured on a microsomal fraction prepared from the tissue homogenate. Smoke inhalation produced a twofold increase in extracellular surfactant total phospholipid. While there was no change in the total phospholipid or phosphatidylcholine (PC) content of the intracellular surfactant, smoke inhalation significantly decreased the disaturated species of PC (DSPC). The specific activity of PLA2 was reduced by more than 50% in both groups of exposed mice. Smoke inhalation appears to result in selective depletion of the DSPC of intracellular surfactant and PLA2 involved in its synthesis. This depletion may be compensated for by increased secretion or slower breakdown of the material present in the extracellular compartment.

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Selected References

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