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J Appl Physiol 68: 1576-1580, 1990;
8750-7587/90 $5.00
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Journal of Applied Physiology, Vol 68, Issue 4 1576-1580, Copyright © 1990 by American Physiological Society

ARTICLES

Leukotriene B4 and late asthmatic reactions induced by toluene diisocyanate

E. Zocca, L. M. Fabbri, P. Boschetto, M. Plebani, M. Masiero, G. F. Milani, F. Pivirotto and C. E. Mapp
Interuniversity Center on Mechanisms of Lung Injury, University of Milan, Italy.

We investigated whether leukotriene B4 (LTB4) is released from the lungs of sensitized subjects during asthmatic reactions induced by toluene diisocyanate (TDI). We examined three groups of TDI-sensitized subjects, one after no exposure to TDI, the second 8 h after an exposure to TDI that caused an early asthmatic reaction, and the third 8 h after an exposure to TDI that caused a late asthmatic reaction. We analyzed bronchoalveolar lavage (BAL) fluid by reverse-phase high-performance liquid chromatography and by specific radioimmunoassay. The mean concentration of LTB4 was higher [0.31 +/- 0.09 (SE) ng/ml, range 0.15-0.51] in BAL fluid of sensitized subjects who developed a late asthmatic reaction than in BAL fluid of subjects who developed an early asthmatic reaction (0.05 +/- 0.04 ng/ml, range 0-0.224), and no LTB4 was detectable in the control subjects. We also performed BAL 8 h after TDI exposure on four TDI-sensitized late-dual reactors who were on steroid treatment. In this group of subjects no LTB4 was detectable. These results suggest that LTB4 may be involved in late asthmatic reactions induced by TDI.


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