支气管哮喘患者血清白细胞介素(IL)-18的水平变化及IL-18对小鼠过敏性炎症的调节机制研究
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摘要
【目的】探讨哮喘患者血清中IL-18、总IgE、Th1和Th2类细胞因子水平变化的相关性及IL-18对小鼠过敏性炎症的调节机制。
     【方法】随机收集哮喘急性发作期患者50例,健康对照者50例血清。采用双抗体夹心酶联免疫吸附试验(ELISA)分别检测血清IL-18、总IgE、IL-8、IL-4、IFN-γ水平。雌性BALB/c小鼠78只,8-10周龄,按随机数字表法分为阴性对照组、生理盐水(normal saline, NS)组、IL-18组、IL-18结合蛋白(binding protein, BP)组、Eotaxin组、IL-18+Eotaxin组、IL-18BP+Eotaxin组,除阴性对照组外每组设非致敏对照组,每组6只,各致敏组小鼠分别在第1、7、13、19、20、21天腹腔注射致敏液OVA,最后一次激发前10min、30min、1h分别给与IL-18、IL-18BP、Eotaxin、IL-18+Eotaxin、IL-18BP+Eotaxin腹腔注射,末次激发3小时后收集腹腔灌洗液,用ELISA法观察小鼠腹腔灌洗液(PLF)上清中IgE、IL-6、IL-12分泌情况;瑞士染色细胞涂片计数肥大细胞(MC)和嗜酸性粒细胞(EOS),流式细胞术检测PLF中T细胞和单核细胞PAR-1、2、4的表达, CD4+CD25+Treg和Th17的表达。非致敏组小鼠与致敏组同步喂养,给药步骤同致敏组,末次用药后3小时处死,其余检测同致敏组。
     【结果】哮喘组IL-18、IL-8、IL-4均高于对照组,但IFN-γ水平低于试剂盒的检测范围。哮喘组血清总IgE水平明显高于对照组,IL-18与IL-8、IL-4、总IgE,IL-4与总IgE之间分别存在正相关。对小鼠PLF进行涂片并瑞士染色分类计数细胞发现IL-18、Eotaxin、IL-18+Eotaxin组MC及EOS细胞数明显增高,IL-18BP组MC及EOS细胞数明显减少,IL-18BP+Eotaxin与NS组相比无明显差异,但各组MC及EOS均高于阴性对照组(P<0.05)。ELISA结果显示,致敏小鼠PLF上清总IgE水平都显著高于阴性对照组,与NS组比较,IL-18、IL-18+Eotaxin组总IgE水平明显降低,而IL-18BP、Eotaxin、IL-18BP+Eotaxin组总IgE水平明显升高(P<0.05);未致敏状态与致敏状态趋势一致且均低于对应致敏组(P<0.05)。致敏小鼠PLF上清IL-6水平均高于阴性对照组,IL-18、IL-18+Eotaxin刺激IL-6的分泌,IL-18BP、Eotaxin、IL-18BP+Eotaxin抑制IL-6的分泌;未致敏IL-6水平均低于对应致敏组(P<0.05)。致敏小鼠PLF上清IL-12水平在IL-18刺激后明显升高,IL-18BP、Eotaxin、IL-18+Eotaxin、IL-18BP+Eotaxin干预后降低(P<0.05);未致敏组IL-12水平在IL-18作用后降低,且低于对应致敏组,其他组IL-12水平均升高且高于对应致敏组(P<0.05)。
     流式细胞术提示致敏小鼠的PLF中IL-18BP、Eotaxin诱导的T淋巴细胞、单核细胞PAR-1、4的表达明显高于NS组,而IL-18作用后的表达低于NS组;此外,IL-18+Eotaxin、IL-18BP+Eotaxin诱导单核细胞PAR-1、4表达升高,而T淋巴细胞的表达降低(P<0.05)。IL-18、Eotaxin诱导的T淋巴细胞PAR-2的表达明显高于NS组,IL-18BP、IL-18BP+Eotaxin作用后的表达低于NS组,但是,只有IL-18BP+Eotaxin诱导单核细胞PAR-2的表达升高,其它均降低(P<0.05)。CD4~+CD25~+T淋巴细胞数在IL-18、IL-18+Eotaxin、IL-18BP+Eotaxin诱导后明显多于NS组,而在IL-18BP、Eotaxin干预后明显少于NS组(P<0.05);同阴性对照组相比,各致敏组CD4~+CD25~+T淋巴细胞数均减少(P<0.05)。Th17细胞数在IL-18、Eotaxin、IL-18+Eotaxin诱导后增加,而在IL-18BP、IL-18BP+Eotaxin干预后减少(P<0.05)。
     未致敏小鼠PLF中IL-18诱导的单核细胞PAR-1、4的表达明显高于NS组,而IL-18BP、Eotaxin、IL-18BP+Eotaxin作用后的T淋巴细胞、单核细胞的表达明显低于NS组(P<0.05)。IL-18BP诱导的T淋巴细胞、单核细胞PAR-2的表达明显高于NS组,而IL-18、Eotaxin作用后的表达低于NS组(P<0.05)。CD4~+CD25~+T淋巴细胞、Th17细胞数量在IL-18、Eotaxin诱导后明显多于NS组,而在IL-18BP干预后明显少于NS组(P<0.05);同致敏组相比IL-18BP、Eotaxin作用的T细胞PAR-1、4的表达降低,其余各组均增高(P<0.05)。
     【结论】哮喘患者血清IL-18水平增高提示该细胞因子参与哮喘的发病过程。IL-18调节过敏性小鼠腹腔灌洗液T淋巴细胞和单核细胞PARs表达、CD4+CD25+T淋巴细胞及Th17细胞数,刺激IL-6及IL-12分泌的作用部分揭示了其在过敏性炎症中的作用机制。
OBJECTIVE: To investigate the correlation among serum levels of IL-18 ,total IgE ,Th1 and Th2 type cytokine in the patients with asthma ,and the regulatory mechanism of IL-18 in mouse allergic inflammatory.
     METHOD: 50 patients with acute asthma attack (group asthms) and 50 healthy subjects (group contronl) for the measurements of total IgE, IL-18, IL-8, IL-4 and IFN-γwith ELISA.78 femal BALB/c mices were randomly divided into 13 groups. They are normal group,NS group,IL-18 group,IL-18BP group,Eotaxin group, IL-18+Eotaxin group, IL-18BP+Eotaxin group.Every group had a unsensitive control and contained 6 mice.All mouses exclude normal group were immunized intraperitoneally with ovalbumin(OVA) on 1,7,13, 19 ,20 ,21d, OVA-sensitized mice were injected intraperitoneally with murine rIL-18,IL-18BP,Eotaxin, IL-18+Eotaxin, IL-18BP+Eotaxin (1ug) at 10min,30min and 1 h before the last intraperitoneally OVA challenge. As a control,OVA-sensitized mice were injected intraperitoneally with 0.9% saline.The peritoneal lavage fluid was then collected at 3h after OVA or saline intraperitoneal.The immunoglobulinE (IgE),IL-6,IL-12 in the mice supernatants of PLF were observed by the means of enzyme linked immunosorbent assay (ELISA),PLF cell differentials were determined by counting 500 cells stained with Wright-Giemsa solution,expression of PARs , CD4~+CD25~+Treg,Th17 cell were analyzed by flowcytometry.Unsensitive control group were fed in the same condition with all sensitive groups and other administer were alike with sensitive groups.
     RESULTS: In asthmatic group,serum IL-18,IL-8 and IL-4 in group asthma were increased compaired with group C.The total IgE level in asthmatics was also increased compaired with group C.Serum levels of IL-18 was positively correlated with that of IL-8,IL-4 and total IgE,and IL-4 was positively correlated with that of total IgE.The level of total serum IgE were increased significantly in OVA- sensitized /challenged mice compared with the control group(P<0.05), administration of IL-18 reduced the levels of total serum IgE compared with other groups in both sensitive and unsensitive groups(P<0.05).IL-18 induced IL-12 and IL-6 release in sensitived mouse PLF supernatant,and there was decreased IL-12 and increased IL-6 in unsensitive group(P<0.05).The eosinophil and mast cell infiltration into the PLF of IL-18, Eotaxin and IL-18+Eotaxin groups were significantly increased compared with those in group NS.The administration of IL-18BP significantly decreased OVA- induced eosinophil and mast cell recruitment into the PLF. Which was not significantly different between group IL-18BP+Eotaxin and NS.
     Flow cytometry demonstrated that in sensitived group PLF PAR-1 and PAR-4 expression on T-cells and monocytes in group IL-18BP and Eotaxin were increased over those in group NS,but in group IL-18 was decreased, however PAR-1 and PAR-4 expression on monocytes in group IL-18+Eotaxin, IL-18BP+Eotaxin were increase which not on T-cells(P<0.05).PAR-2 expression on T-cells in group IL-18 and Eotaxin were increased comparied with NS, but in group IL-18BP and IL-18BP+Eotaxin were decreased,however the PAR-2 expression on monocytes in group IL-18BP+Eotaxin was increase which not on(P<0.05).Treament with IL-18,IL-18+Eotaxin, IL-18BP+Eotaxin led to a sharp increase of CD4~+CD25~+Treg but not IL-18BP and Eotaxin(P<0.05). CD4~+CD25~+Treg in all sensitive groups were increased compared with those in group control . IL-18,Eotaxin,IL-18+Eotaxin induce Th17 cell to differentiate, modulation were blocked by administration of IL-18BP and IL-18BP+ Eotaxin(P<0.05).In unsensitive group, PAR-1 and PAR-4 expression on monocytes in group IL-18 were increased over those in group NS, but decreased on monocytes and T-cells in IL-18BP,Eotaxin and IL-18BP+Eotaxin(P<0.05). PAR-2 expression on T-cells and monocytes in group IL-18BP was increased comparied with NS ,but in group IL-18 and Eotaxin were decreased(P<0.05). Administration of induce number of CD4~+CD25~+Treg and Th17 cell in IL-18 and Eotaxin groups were higher than those of the NS group, while it was fewer in IL-18BP group(P<0.05).
     In unsensitive groups all of above were increased compared with corresponding sensitive groups excluded PAR-1 and PAR-4 expression on T-cells in IL-18BP and Eotaxin groups(P<0.05);
     CONCLUSION: Increased serum levels of IL-18 indicate that the cytokine is likely to participate in the pathogenesis of asthma.The effect that IL-18 could modulate expression of PARs on T-cells and monocytes, the number of CD4~+CD25~+Treg,Th17 cell ,and stimulate IL-6 and IL-12 release reveals the mechanism of of IL-18 in the allergic inflammation partly.
引文
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