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Am J Physiol Lung Cell Mol Physiol (December 30, 2005). doi:10.1152/ajplung.00365.2005
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Submitted on August 22, 2005
Accepted on December 28, 2005

Various Adhesion Molecules Impair Microvascular Leukocyte Kinetics in Ventilator-induced Lung Injury

Naoki Miyao1, Yukio Suzuki2*, Kei Takeshita2, Hiroyasu Kudo1, Makoto Ishii1, Rika Hiraoka1, Kazumi Nishio1, Takuya Tamatani3, Shinji Sakamoto3, Makoto Suematsu4, Harukuni Tsumura5, Akitoshi Ishizaka1, and Kazuhiro Yamaguchi1

1 Department of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan
2 Department of Internal Medicine, Kitasato Institute Hospital, Minato-ku, Tokyo, Japan
3 Pharmaceutical Frontier Research Laboratories, JT Inc., Yokohama, Kanagawa, Japan
4 Department of Biochemistry, Keio University, Shinjuku-ku, Tokyo, Japan
5 Biochemical Department, Sankei Corp., Bunkyo-ku, Tokyo, Japan

* To whom correspondence should be addressed. E-mail: suzuki-yk{at}kitasato.or.jp.

Although the endothelial expression of various adhesion molecules substantially differs between pulmonary microvessels, their importance for neutrophil and lymphocyte sequestration in ventilator-induced lung injury (VILI) has not been systematically analyzed. We investigated the kinetics of polymorphonuclear cells (PMN) and mononuclear cells (MN) in the acinar microcirculation of the isolated rat lung with VILI by real-time confocal laser fluorescence microscopy with or without inhibition of ICAM-1, VCAM-1, or P-selectin by monoclonal antibodies (mAb). Adhesion molecules in each microvessel were estimated by intravital fluorescence microscopy or immunohistochemical staining. In high tidal volume ventilated lungs, 1) ICAM-1, VCAM-1, and P-selectin were differently upregulated in venules, arterioles, and capillaries. 2) Venular PMN rolling was improved by inhibition of ICAM-1, VCAM-1, or P-selectin, while arteriolar PMN rolling was improved by ICAM-1 or VCAM-1 inhibition. 3) Capillary PMN entrapment was ameliorated only by anti-ICAM-1 mAb. 4) MN rolling in venules and arterioles and MN entrapment in capillaries were improved by ICAM-1 and VCAM-1 inhibition. In conclusion, the contribution of endothelial adhesion molecules to abnormal leukocyte behavior in VILI-injured microcirculation is microvessel- and leukocyte-specific. ICAM-1- and VCAM-1-dependent, but P-selectin-independent, arteriolar PMN rolling, which is expected to reflect the initial stage of tissue injury, should be taken as a phenomenon unique to ventilator-associated lung injury.




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