Granulocyte colony-stimulating factor exacerbates acute lung injury induced by intratracheal endotoxin in guinea pigs.
The effects of recombinant human granulocyte colony-stimulating factor (rG-CSF) on the lung injury induced by intratracheal endotoxin were studied using guinea pigs. Animals were divided into four groups: (1) saline control, (2) endotoxin alone, (3) cyclophosphamide (CPA)+endotoxin, and (4) CPA+rG-CSF+endotoxin. CPA was injected intraperitoneally to suppress hematopoietic function 7 d before the study. rG-CSF at a dose of 100 micrograms/kg was administered subcutaneously twice a day for 5 consecutive d beginning 2 d after the CPA pretreatment. Saline or 0.2 mg/kg of endotoxin was administered via the airway, and the animals were observed for 4 h. 99mTc-labeled macroaggregated albumin was mixed with saline or endotoxin to obtain a lobar distribution. Lung injury was assessed by the concentration ratio of 125I-labeled albumin in lung tissue to plasma (T/P) and lung wet-dry weight ratio (W/D). We also counted the number of neutrophils in bronchoalveolar lavage (BAL) fluid and fixed lung tissues. T/P, but not W/D, increased in endotoxin-alone and CPA+endotoxin groups compared with the saline control group (p < 0.01). Both T/P and W/D of the CPA+rG-CSF+endotoxin group were significantly higher than those of the endotoxin-alone and CPA+endotoxin groups (p < 0.01). In the CPA+rG-CSF+endotoxin group, histopathologic examination of the lung sections showed neutrophil recruitment into the lung, and neutrophil counts in BAL fluid were elevated. In conclusion, pretreatment with rG-CSF increased sequestration of neutrophils into the lung and exacerbated the lung injury induced by intratracheal endotoxin in CPA-treated guinea pigs.
Terashima
T
T
Department of Medicine, School of Medicine, Keio University, Tokyo, Japan.
Kanazawa
M
M
Sayama
K
K
Ishizaka
A
A
Urano
T
T
Sakamaki
F
F
Nakamura
H
H
Waki
Y
Y
Tasaka
S
S
D000208:Acute Disease; D000818:Animals; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D003520:Cyclophosphamide / Q000494:pharmacology; D004731:Endotoxins; D015633:Extravascular Lung Water / Q000378:metabolism; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology*; D006168:Guinea Pigs; D006801:Humans; D008168:Lung / Q000473:pathology / Q000503:physiopathology; D009504:Neutrophils / Q000502:physiology; D010539:Permeability; D012128:Respiratory Distress Syndrome / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology* / Q000503:physiopathology
D004731:Endotoxins; D016179:Granulocyte Colony-Stimulating Factor; D003520:Cyclophosphamide