支气管哮喘患者呼出气冷凝液中8-异前列腺素水平的研究

目的 探讨哮喘患者呼出气冷凝液(EBC)中8-异前列腺素(8-iso-PG)水平与病情严重程度的关系.阐明EBC中8-jso-PG监测对评估哮喘气道氧化应激的价值.方法 纳入59例哮喘患者和13名健康对照为研究对象.哮喘患者按照病情分为急性发作组15例,非急性发作组44例(轻度间歇者13例,轻度持续者15例,中重度持续者16例).采用EcoScreen收集EBC,酶联免疫分析法(EIA)检测EBC中的8-iso-PG水平.结果 哮喘急性发作组EBC中8-iso-PG水平较非急性发作组高(P<0.01).非急性发作组中轻度持续[(17.9±1.2)pg/mL]和中重度持续[(39.7±4.0)pg/mL]患者EBC中8-iso-PG水平较健康对照组显著升高(P<0.01),轻度间歇[(13.5±1.1)pg/mL]与健康对照无显著差异(P>0.05).中重度持续较轻度持续高,轻度持续较轻度间歇高(P<0.01).轻度持续哮喘患者吸人激素治疗1个月后EBC中8-iso-PG水平[(17.7±1.1)pg/mL]较治疗前无显著变化(P>0.05).结论 EBC中8-iso-PG的增高与哮喘病情严重程度有关,可作为检测哮喘气道氧化应激的客观指标.吸入糖皮质激素后8-iso-PG无显著性降低,提示吸入糖皮质激素不能有效地控制哮喘气道氧化应激损伤.

8-Isoprostane in Exhaled Breath Condensate of Patients with Asthma

Objective To invesitgate the relationship between 8-iseprostane (8-iso-PG) level in exhaled breath condensates (EBCs) and severity of asthma and explore the role of 8-iso-PG in asthma evaluation and monitoring.Methods Fifty-nine patients with asthma were enrolled.In which 15 eases were acute exacerbation, 13 eases were mild intermittent, 15 eases were mild persistent, and 16 eases were mederate-to-severe persistent.Thirteen healthy volunteers were recruited as control.EBCs were collected using EeoSereen system.The 8-iso-PG levels in EBCs were measured by a specific enzyme immunoassay.The patients with mild intermittent asthma were treated with inhaled corticosteroid (ICS) for one month and their EBCs were recollected for 8-iso-PG measurement.Results Exhaled 8-iso-PG levels were obviously increased in the patients with acute asthma compared with those chronic asthmatics [(47.2±6.8) pg/mL vs (24.5±12.0) pg/mL, P < 0.01].In the chronic persistent asthma, the levels were significantly higher in patients with mild persistent and moderate-to-severe asthma [(17.9±1.2) pg/mL and (39.7±4.0) pg/mL, P <0.01].While 8-iso-PG level did not differ significantly in intermittent asthma [(13.5±1.1) pg/mL] compared with the control subjects (P > 0.05).After one-month ICS treatment the 8-iso-PG level in the patients with mild intermittent asthma did not change significantly although the ACT score improved.Conclusions 8-iso-PG levels in EBC are associated with the severity of asthma,implicating 8-iso-PG may be useful in monitoring airway oxidative stress in asthma.ICS treatment is incapable of decreasing the 8-iso-PG,suggesting the ICS has minor impact on oxidative stress.