Phagocytic functions and tumor necrosis factor secretion of human monocytes exposed to natural porcine surfactant (Curosurf)

Abstract

In this study we have analyzed various phagocytic functions and tumor necrosis factor (TNF) secretion of human monocytes exposed to either a biochemically well-defined porcine surfactant or a purified phospholipid preparation. Adherence, random migration, and chemotactic response to zymosan activated serum and formyl-methionyl-leucyl-phenylalanine were normal in surfactant-treated monocytes; surfactant was not a chemotactic stimulus. In contrast, phagocytosis of Staphylococcus aureus by monocytes exposed to surfactant (100 micrograms/mL) or phospholipids (100 micrograms/mL) was slightly impaired [surfactant: at 30 min (t30) 48.5 +/- 11%, t60 73.3 +/- 10.1%; phospholipids; t30 47.3 +/- 2.5%, t60 68.0 +/- 6.6%; controls: t30 66.6 +/- 9.9%, t60 81.0 +/- 6.6%, p less than 0.05 at t30 for both, p less than 0.05 at t60 for phospholipids]. Due to the smaller number of S. aureus ingested, bactericidal activity of surfactant- or phospholipid-treated monocytes was slightly reduced when compared with controls. Surfactant or phospholipids had no bactericidal activity. Uptake of Candida albicans was identical in surfactant- or phospholipid-treated monocytes and untreated controls; the same was true for the number of Candida organisms ingested per cell. Phagocytosis-associated chemiluminescence and production of superoxide anion by monocytes of either source in response to phorbol myristate acetate and opsonized zymosan were also unaffected.(ABSTRACT TRUNCATED AT 250 WORDS)