Surfactant modifies the lymphoproliferative activity of macrophages in hypersensitivity pneumonitis

The American Journal of Physiology
E Israël-Assayag, Y Cormier

Abstract

Alveolar macrophages (AM) from normal individuals suppress mitogen-induced peripheral blood mononuclear cell (PBMC) proliferation, whereas cells from patients with hypersensitivity pneumonitis (HP) enhance PBMC. Because surfactant components can interfere with AM functions, we tested the effect of Survanta (a modified bovine surfactant) and surfactant fractions isolated from bronchoalveolar lavage of normal subjects and HP patients on AM-induced lymphoproliferation. Surfactant fractions were isolated from bronchoalveolar lavage fluids by differential centrifugation into total aggregates (TA) and large aggregates (LA). Surfactant preparations (200 micrograms/ml) from 10 normal subjects (N) or 12 HP patients or of Survanta were added to AM-PBMC cocultures stimulated with phytohemagglutinin (PHA) at 1:1 and 2:1 ratios. Results, expressed as percent of PHA-induced PBMC proliferation cocultures without surfactant, show that normal surfactant and Survanta decrease mitogen-induced proliferation of cells to a larger extent than surfactant from HP patients. For AM-to-PBMC ratios of 1:1, the results were as follows: N TA 10.58 +/- 2.75% (mean +/- SE), N LA 12.96 +/- 2.78%, HP TA 43.09 +/- 7.81%, HP LA 61.64 +/- 7.77%, and Survanta 16.70 ...Continue Reading

References

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