Hepatocyte growth factor is produced by blood and alveolar neutrophils in acute respiratory failure.
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 x ml(-1) x 10(-7) neutrophils (median, 25th-75th percentile) and doubled to 1,730 (1,684-2,316) pg x ml(-1) x 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 x ml(-1) x 10(-7) neutrophils, P = 0.4] and doubled with LPS stimulation [2,767 (2,165-3,688) pg x ml(-1) x 10(-7) neutrophils, P < 0.0001 vs. controls]. Alveolar neutrophils released HGF in vitro [653 (397-1,209) pg x ml(-1) x 10(-7) neutrophils]. LPS stimulation did not significantly increase the HGF release from alveolar neutrophils [762 (434-1,305) pg x ml(-1) x 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.
Jaffré
Sandrine
S
Institut National de la Santé et de la Recherche Médicale Unité 408, Faculté Xavier Bichat, Département d'Anesthésie-Réanimation, Hôpital Bichat, Assistance Publique-Hôpitaux de Paris, 75877 Paris, France.
Dehoux
Monique
M
Paugam
Catherine
C
Grenier
Alain
A
Chollet-Martin
Sylvie
S
Stern
Jean-Baptiste
JB
Mantz
Jean
J
Aubier
Michel
M
Crestani
Bruno
B
D000208:Acute Disease; D000368:Aged; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology / Q000276:immunology; D005260:Female; D017228:Hepatocyte Growth Factor / Q000096:biosynthesis* / Q000097:blood / Q000378:metabolism; D006801:Humans; D008070:Lipopolysaccharides / Q000494:pharmacology; D008297:Male; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism*; D011650:Pulmonary Alveoli / Q000166:cytology / Q000276:immunology*; D012121:Respiration, Artificial; D012131:Respiratory Insufficiency / Q000276:immunology* / Q000378:metabolism* / Q000628:therapy; D020545:Respiratory Mucosa / Q000276:immunology / Q000378:metabolism
D008070:Lipopolysaccharides; D017228:Hepatocyte Growth Factor