Effect of CD14 blockade on endotoxin-induced acute lung injury in mice

被引:41
作者
Tasaka, S
Ishizaka, A [1 ]
Yamada, W
Shimizu, M
Koh, H
Hasegawa, N
Adachi, Y
Yamaguchi, K
机构
[1] Tokyo Elect Power Co Hosp, Dept Lab Med, Shinjuku Ku, Tokyo 1601100, Japan
[2] Keio Univ, Sch Med, Dept Med, Tokyo 108, Japan
[3] Tokyo Univ Pharm & Life Sci, Lab Immunopharmacol Microbial Prod, Tokyo, Japan
关键词
D O I
10.1165/rcmb.2002-0132OC
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
CD14 functions as a cell surface receptor for endotoxin (lipopolysaccharide [LPS]) and is thought to have an essential role in innate immune responses to infection. Previous studies have revealed attenuation of the systemic response after sepsis by blocking CD14. In this study, we tested the hypothesis that CD14 blockade protects against inflammatory responses associated with LPS pneumonia. We examined the effect of an anti-murine CD14 monoclonal antibody (4C1) on the development of acute lung injury induced by intratracheal LPS in mice. We also measured the production of cytokines (tumor necrosis factor-alpha, interleukin-6, and macrophage inflammatory protein-2) and nitric oxide by murine peritoneal macrophages exposed to LPS in vitro. Nuclear factor (NF)-KB translocation was evaluated in nuclear extracts from lung homogenates. 4C1 significantly attenuated pulmonary edema and neutrophil emigration after LPS administration. The production of cytokines and nitric oxide by LPS-stimulated macrophages was significantly decreased by 4C1 treatment. NF-KB translocation induced by LPS instillation was also suppressed by 4C1. These results suggest that blockade of CD14 might attenuate acute lung injury after intratracheal instillation of LPS through the suppression of NF-KB translocation. The inhibitory effect of CD14 blockade on cytokine production and nitric oxide release of macrophages might contribute to the attenuation of lung injury.
引用
收藏
页码:252 / 258
页数:7
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