Journal of Applied Physiology
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J Appl Physiol 67: 2432-2437, 1989;
8750-7587/89 $5.00
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Journal of Applied Physiology, Vol 67, Issue 6 2432-2437, Copyright © 1989 by American Physiological Society

ARTICLES

Prevention of interleukin 2-induced acute lung injury in guinea pigs by pentoxifylline

A. Ishizaka, J. R. Hatherill, H. Harada, M. Yonemaru, H. Hoffmann, H. Zheng, P. T. O'Hanley and T. A. Raffin
Department of Medicine, Stanford University Medical Center, California 94035.

We administered recombinant human interleukin 2 (IL-2) to guinea pigs to investigate whether IL-2 would cause acute lung injury. In addition, we examined the effects of pentoxifylline (PTXF) on IL-2-induced acute lung injury. Three groups of animals were studied over a period of 8 h. The saline control group was injected intravenously with 2 ml of pyrogen-free saline; the IL-2 group was injected intravenously with 4 X 10(6) U/kg recombinant IL-2; and the IL-2-PTXF group was injected with a 20-mg/kg bolus of PTXF followed by a continuous infusion (6 mg.kg-1.h-1) started 60 min before injection of 4 X 10(6) U/kg IL-2. Lung water (wet-to-dry lung weight ratio), the concentration ratios of 125I-albumin in bronchoalveolar lavage (BAL) fluid and lung tissue compared with plasma (125I-albumin BAL-to-plasma, 125I-albumin lung-to-plasma), and cell counts in BAL fluid were examined. An intravenous injection of IL-2 caused an increased lung water (P less than 0.01), an increased 125I-albumin lung-to-plasma ratio (P less than 0.05), and a significant increase in the absolute number of neutrophils, lymphocytes, and macrophages in BAL fluid compared with the saline control. In contrast, the PTXF-pretreated group did not demonstrate IL-2-induced acute lung injury (lung water, 125I-albumin lung-to-plasma) or increased accumulation of neutrophils, lymphocytes, and macrophages in the BAL. These data suggest a possible role for PTXF in attenuating the side effects of IL-2.


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