Henricks P A, Binkhorst G J, Drijver A A, Nijkamp F P
Department of Pharmacology, Faculty of Pharmacy, University of Utrecht, The Netherlands.
Infect Immun. 1992 Aug;60(8):3238-43. doi: 10.1128/iai.60.8.3238-3243.1992.
The influence of the leukotoxin of Pasteurella haemolytica on the generation of arachidonic acid metabolites by bovine polymorphonuclear leukocytes (PMNs) was investigated. PMNs released 5-, 12-, and 15-hydroxyeicosatetraenoic acids (5-, 12-, and 15-HETE) and leukotriene B4 (LTB4) upon stimulation with arachidonic acid. The leukotoxin preparations dose dependently enhanced the release of the 5-lipoxygenase products 5-HETE and LTB4 in arachidonic acid-stimulated PMNs, whereas the release of 12- and 15-HETE was not affected. The enhanced release of LTB4 and 5-HETE was not due to a decreased cellular retention of the 5-lipoxygenase products. In addition, leukotoxin preparations by themselves were also able to induce LTB4 and 5-HETE production in the absence of exogenous arachidonic acid. Generation of 5-lipoxygenase products by PMNs stimulated by leukotoxin may represent an important cellular event that occurs during infections with P. haemolytica.
研究了溶血巴斯德菌白细胞毒素对牛多形核白细胞(PMN)花生四烯酸代谢产物生成的影响。PMN在受到花生四烯酸刺激后会释放5-、12-和15-羟基二十碳四烯酸(5-、12-和15-HETE)以及白三烯B4(LTB4)。白细胞毒素制剂在花生四烯酸刺激的PMN中剂量依赖性地增强了5-脂氧合酶产物5-HETE和LTB4的释放,而12-和15-HETE的释放未受影响。LTB4和5-HETE释放的增强并非由于5-脂氧合酶产物细胞内保留的减少。此外,白细胞毒素制剂自身在没有外源性花生四烯酸的情况下也能够诱导LTB4和5-HETE的产生。由白细胞毒素刺激的PMN产生5-脂氧合酶产物可能代表了溶血巴斯德菌感染期间发生的一个重要细胞事件。