摘要
目的 探讨白细胞介素-18(IL-18)对慢性乙型肝炎患者外周血单个核细胞(PBMC)的作用及体外对转染乙型肝炎病毒(HBV)基因的人肝癌细胞系2.2.15(HepG2.2.15)细胞HBV DNA分泌的影响。方法 分离25例正常人及25例慢性乙型肝炎患者的PBMC,在乙型肝炎核心抗原(HBcAg)及不同浓度IL-18刺激下培养72h,收集其培养上清液,采用酶联免疫试验办法检测其中干扰素γ(IFN-γ)的含量;收集1例慢性乙型肝炎患者的PBMC,与已培养了24 h的HepG2.2.15细胞共孵育,经过不同浓度的IL-18刺激培养96h后,收集其培养上清液,采用聚合酶链反应(PCR)检测HBV DNA的含量。结果 PBMC在HBcAg联合0.2、1.0、5.0ng/ml的IL—18刺激下,慢性肝炎组培养上清液中IFN-γ的水平均较正常对照组明显增高(0.2ng/ml组:t 11.7,P<0.01;1.0ng/ml组:t-16.19,P<0.01;5.0ng/ml组:t-20.12,P<0.01);在HBcAg联合IL-18和IL-12刺激下,慢性肝炎IFN-γ的水平亦较正常对照组明显增高,分别为(1313.20±187.76)pg/ml和(390.75±43.23)pg/ml,t—23.94,P<0.01;在慢性肝炎轻、中、重度患者中,单独HBcAg刺激组与HBcAg联合不同浓度的IL-18刺激组相比,联合刺激组的IFN-γ的水平均较单独刺激组增高;HBcAg联合IL-18刺激组与联合IL-12和同一浓度的IL-18刺激组相比。
Objective To explore the effect of IL-18 on peripheral blood monocytes (PBMCs) from chronic hepatitis B (CHB) patients and HBV DNA released by HepG2.2.15 cells, which were transfected with the gene of HBV. Methods PBMCs were isolated from 25 healthy persons and 25 CHB patients, which were co-cultured with HBcAg and IL-18 at different concentrations for 72 hours. The level of IFN- γ in the culture supernatant of PBMCs was determined by ELISA. One patient's PBMCs were co-cultured for 96 hours with various concentrations of IL-18 and HepG2.2.15 cells which had been cultured for 24 hours, the supernatant was collected to detect HBV DNA level by PCR. Results When PBMCs were stimulated by HBcAg and IL-18 at various concentrations, the levels of supernatant IFN- y in the CHB group were much higher than those in the normal control group (at 0.2 ng/ml: t = 11.7, P < 0.01; at 1.0 ng/ml: t = 16.19, P < 0.01; at 5.0 ng/ml: t = 20.12, P < 0.01), especially when the PBMCs were stimulated by HBcAg, IL-18 and IL-12 (1 313.20 pg/ml ±187.76 pg/ml vs 390.75 pg/ml± 43.23 pg/ml, t = 23.94, P<0.01). The IFN-γ level in the patients who were stimulated by HBcAg alone was much lower than the levels in the patients who were stimulated by HBcAg and IL-18 at various concentrations, and which were lower than those in the patients stimulated by HBcAg. IL-12 and IL-18 at the same concentrations (light: ( = 2.2, P < 0.05; moderate: t = 2.97, P < 0.05). The HBV DNA content in the supernatant of co-cultivation with HepG2.2.15 cells and PBMCs was much higher than that of the two kinds of cells stimulated by HBcAg and IL-18 at various concentrations or HBcAg, IL-18 and IL-12/IFN- a1b. Conclusion IL-18 can improve the PBMCs from CHB patients to produce a great deal of IFN- y , so it has a good application prospect in two aspects: immunoregulatory effects and increasing the ability to kill the cells infected with virus.
出处
《中华肝脏病杂志》
CAS
CSCD
2003年第8期470-473,共4页
Chinese Journal of Hepatology
