Abstract
In the present study, the effect of a tumor necrosis factor receptor binding protein (TNFbp) on the cell infiltration induced by lipopolysaccharide (LPS) and Sephadex beads in guinea pig lung was examined. The intratracheal injection of LPS (2.5μg) induced a six-fold increase in total cell number recovered in bronchoalveolar lavage (BAL) fluid at 24 hr. This increase in bronchopulmonary inflammation was mainly due to a neutrophil and macrophage infiltration, representing 60% and 35% of the total cells, respectively. The intravenous or intratracheal injection of Sephadex beads to guinea pigs induced a three-fold increase in total cell number recovered in BAL at 24 h and was characterized by a prominent eosinophil, macrophage, and neutrophil infiltration representing 36%, 42%, and 16% of the total cells, respectively. In addition, bronchial tissues isolated from Sephadex-treated guinea pigs showed an increased in vitro reactivity to both histamine and acetylcholine. TNFbp (1–50μg) induced a dose-dependent inhibition of cell infiltration induced by LPS. In contrast TNFbp neither attenuated the bronchopulmonary cell infiltration observed 24 h following intravenous or intratracheal administration of Sephadex beads nor inhibited the increase in bronchial reactivity. These results show that TNF plays an important role in cell infiltration induced by LPS, but not that induced by Sephadex, in the guinea pig lung.
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Conroy, D.M., Francischi, J.N. & Sirois, P. Effect of tumor necrosis factor receptor binding protein on cell infiltration induced by lipopolysaccharide and sephadex beads in guinea pig lung. Inflammation 19, 233–243 (1995). https://doi.org/10.1007/BF01534464
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DOI: https://doi.org/10.1007/BF01534464