The American review of respiratory disease
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Am. Rev. Respir. Dis. · Mar 1983
Functional and metabolic activity of granulocytes from patients with adult respiratory distress syndrome. Evidence for activated neutrophils in the pulmonary circulation.
Although it has been proposed that the circulating granulocyte (PMN) is an effector cell that causes pulmonary vascular injury in the adult respiratory distress syndrome (ARDS), the functional status of PMNs from patients with this disorder has not been previously defined. In the present study we found that PMNs in samples of pulmonary artery blood from patients with ARDS are in a functionally and metabolically activated state. The mean chemotactic index of PMNs from ARDS patients was 172 +/- 22 SEM compared with a mean chemotactic index of 79 +/- 8 of PMNs from normal subjects (p = 0.0001), a 227 +/- 24% increase over the control value. ⋯ The PMNs from patients with ARDS had increased ratios of intracellular cyclic GMP to cyclic AMP (165 +/- 5% of control, p = 0.0002), which may be related to the enhanced metabolic activity. Release of superoxide anion, a potential mediator of endothelial injury, was increased over that of control by PMNs from 4 of 8 patients with ARDS (mean, 205 +/- 71% of normal). The results suggest that the circulating PMN is in an activated state in patients with ARDS and may be more likely to release active oxygen species and other inflammatory mediators when perturbed, potentially contributing to pulmonary vascular injury and alveolitis.