A novel thromboxane synthetase inhibitor, DP-1904, inhibits human blood eosinophil degranulation.
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| Abstract |
Eosinophils have been recognized to be associated with various immune responses and disease processes including bronchial asthma. Eosinophils release a number of cytotoxic and neurotoxic mediators. However, the factors regulating such release and the underlying mechanisms are unclear. In this study, we investigated the effect of a selective and potent thromboxane synthase inhibitor, DP-1904, on the release of eosinophil cationic protein (ECP) in platelet activating factor (PAF) and IgG-stimulated human blood eosinophils. PAF (1 microM) and IgG both released ECP which constituted about 25-30% of the total ECP content. The control protein, ovalbumin, did not release any ECP over the basal values. DP-1904 in two different concentrations, 10 microM and 100 microM, significantly attenuated the release of ECP in response to PAF or IgG. The mean percent inhibition by 10 microM DP-1904 was 49 +/- 10 and 31 +/- 2 against PAF and IgG-induced ECP release, respectively. However, at 100 microM DP-1904 the percent inhibition was 76 +/- 14 and 67 +/- 2, respectively. These data suggest that TXA2 is an important mediator in the regulation of eosinophil degranulation, and DP-1904 thus might prove beneficial in the treatment of bronchial asthma.
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| Authors | D K Agrawal, M Takami, S Ono |
| Journal | Inflammation (Inflammation) Vol. 21 Issue 1 Pg. 1-8 (Feb 1997) ISSN: 0360-3997 [Print] United States |
| PMID | 9179617 (Publication Type: Journal Article) |
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