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J Appl Physiol 77: 1281-1287, 1994;
8750-7587/94 $5.00
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Journal of Applied Physiology, Vol 77, Issue 3 1281-1287, Copyright © 1994 by American Physiological Society

ARTICLES

TGF-beta 1 causes increased endothelial ICAM-1 expression and lung injury

Y. Suzuki, T. Tanigaki, D. Heimer, W. Wang, W. G. Ross, G. A. Murphy, A. Sakai, H. H. Sussman, T. H. Vu and T. A. Raffin
Department of Medicine, Stanford University Medical Center 94305.

Neutrophil adherence to vascular endothelium is partially mediated by adhesion molecules, including intracellular adhesion molecule 1 (ICAM-1), on endothelial cells. We examined the effect of transforming growth factor-beta 1 (TGF-beta 1) on the expression of ICAM-1 in human umbilical vein endothelial cells (HUVEC). TGF-beta 1 (1 ng/ml) increased ICAM-1 and ICAM-1 mRNA expression in HUVEC, as assessed by flow cytometry and Northern blot analysis, respectively. In addition, we investigated whether exogenous recombinant TGF-beta 1 can cause neutrophil-mediated lung injury in guinea pigs. The plasma half-life of 125I-labeled TGF-beta 1 in guinea pigs was 4.6 +/- 0.1 min, and the 125I activity was 2.8 +/- 0.2% 8 h after injection. The ratio of 125I-labeled albumin concentration in lung tissue and bronchoalveolar lavage (BAL) fluid to that in plasma, lung wet-to-dry weight ratio, numbers of neutrophils in BAL fluid, and numbers of neutrophils per alveolus in fixed lung sections increased in guinea pigs that received a high dose of TGF-beta 1 (25 micrograms i.v. followed by 2 micrograms/h for 8 h) compared with the control group. These results suggest that TGF-beta 1 causes neutrophil-mediated lung injury, possibly through upregulation of ICAM-1 on endothelial cells, and might be important in the pathogenesis of lung injury.


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