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Institut National de la Santé et de la Recherche Médicale Unité 408 and 479, Faculté Xavier Bichat, Département d'Anesthésie-Réanimation, Laboratoire de Biochimie A et Service de Pneumologie, Hôpital Bichat, Assistance Publique-Hôpitaux de Paris, 75877 Paris, France
We
tested the novel hypothesis that neutrophils in the lung or the
airspaces may produce hepatocyte growth factor (HGF) in ventilated
patients with acute respiratory failure. Neutrophils were purified from
blood and bronchoalveolar lavage (BAL) fluid samples from 16 mechanically ventilated patients who underwent BAL for a diagnostic
workup of ventilator-acquired pneumonia. Most of the patients had
pneumonia (n = 11). Ten nonventilated patients served
as controls. Both blood and BAL neutrophils released HGF in vitro.
Basal HGF secretion by blood neutrophils from controls was 823 (666)
pg · ml
1 · 10
7 neutrophils
(median, 25th-75th percentile) and doubled to 1,730 (1,684-2,316)
pg · ml
1 · 10
7 neutrophils
(P = 0.001) with lipopolysaccharide (LPS) stimulation. Basal HGF secretion by blood neutrophils from patients was similar [956 (655-2,140)
pg · ml
1 · 10
7 neutrophils,
P = 0.4] and doubled with LPS stimulation [2,767 (2,165-3,688)
pg · ml
1 · 10
7 neutrophils,
P < 0.0001 vs. controls]. Alveolar neutrophils
released HGF in vitro [653 (397-1,209)
pg · ml
1 · 10
7
neutrophils]. LPS stimulation did not significantly increase the HGF
release from alveolar neutrophils [762 (434-1,305)
pg · ml
1 · 10
7
neutrophils]. BAL HGF positively correlated with the BAL neutrophil count (P = 0.01, R = 0.58). We conclude
that blood and alveolar neutrophils from patients with acute
respiratory failure can produce HGF, a mitogenic factor that may
enhance the alveolar repair process.
alveolar epithelium; alveolar repair; acute respiratory distress syndrome; acute lung injury; growth factors
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