Chemotactic factor generation and cell accumulation in acute lung injury induced by endotracheal acid instillation.
We studied the time course of chemotactic factor generation and inflammatory cell accumulation in the rabbit aspiration pneumonia model. Two major potent chemotactic factors, leukotriene B4 (LTB4) and C5a, in bronchoalveolar lavage fluid (BALF) were measured by radioimmunoassay, and cell analysis was also done. The level of LTB4 increased only in the early phase (2-6 h) after endotracheal acid instillation. The level of C5a increased gradually almost in parallel with the total protein level in BALF, and reached a maximum at 24 h. Neutrophil accumulation occurred early and reached a maximum at 24 h. In contrast, the number of alveolar macrophages increased from days 1 to 7. These findings suggest that the increases in LTB4 and C5a are responsible for accumulation of neutrophils and that C5a may be an important chemotactic factor for alveolar macrophage.
Ishii
Y
Y
Department of Pulmonary Medicine, Jichi Medical School, Tochigi, Japan.
Kobayashi
J
J
Kitamura
S
S
D000818:Animals; D001992:Bronchoalveolar Lavage Fluid / Q000032:analysis* / Q000166:cytology*; D002452:Cell Count; D002630:Chemotactic Factors / Q000378:metabolism*; D003182:Complement C5 / Q000031:analogs & derivatives / Q000378:metabolism; D015937:Complement C5a, des-Arginine; D004195:Disease Models, Animal; D006851:Hydrochloric Acid; D007442:Intubation, Intratracheal; D007975:Leukotriene B4 / Q000378:metabolism; D008264:Macrophages; D009504:Neutrophils; D011015:Pneumonia, Aspiration / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D011506:Proteins / Q000378:metabolism; D011817:Rabbits
D002630:Chemotactic Factors; D003182:Complement C5; D015937:Complement C5a, des-Arginine; D011506:Proteins; D007975:Leukotriene B4; D006851:Hydrochloric Acid