ENHANCED LEUKOTRIENE SYNTHESIS IN LEUKOCYTES OF ATOPIC AND ASTHMATIC SUBJECTS

被引:59
作者
SAMPSON, AP [1 ]
THOMAS, RU [1 ]
COSTELLO, JF [1 ]
PIPER, PJ [1 ]
机构
[1] KINGS COLL,SCH MED & DENT,DEPT THORAC MED,LONDON SE5 9PJ,ENGLAND
关键词
LEUKOTRIENES; ATOPIC ASTHMA; LEUKOCYTES; GM-CSF;
D O I
10.1111/j.1365-2125.1992.tb04062.x
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
1 We have investigated the capacities of peripheral leukocytes from atopic asthmatic (AA) (n = 7), atopic non-asthmatic (AN) (n = 7), and normal (N) (n = 7) subjects to generate the bronchoconstrictor and proinflammatory mediators leukotrienes (LTs) B4 and C4. 2 Mixed leukocyte preparations containing 61-84% neutrophils, 2.4-15% eosinophils, and 13-29% mononuclear cells were incubated in vitro at 37-degrees-C in the presence of calcium ionophore A23187. Synthesis of LTB4 and LTC4 was quantitated by radioimmunoassay. 3 Both in dose-response experiments (0-10-mu-M A23187 for 5 min), and in time-course investigations (2-mu-M A23187 for 0-30 min), the mixed leukocytes of the AA and AN subjects generated on average 4- to 5-fold more LTB4 and 3- to 5-fold more LTC4 than the normal leukocytes (P < 0.01 in all cases; ANOVA). 4 This enhanced LT synthesis by the AN and AA leukocytes was not due to differences in the counts of leukocyte sub-types, or to altered rates of LT catabolism between the subject groups. 5 LTB4 synthesis correlated significantly with LTC4 synthesis in the leukocytes of the AN and AA subjects (r = 0.81, n = 14, P < 0.01), but not in those of the normal subjects (r = 0.19, n = 7, P > 0.05). 6 Our results demonstrate an up-regulation of the leukotriene synthetic pathway in the circulating leukocytes of atopic non-asthmatic and atopic asthmatic subjects, which may have important implications in the pathophysiology of asthma and allergy.
引用
收藏
页码:423 / 430
页数:8
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