干扰素诱导蛋白44基因与系统性红斑狼疮的相关性研究

目的 探讨系统性红斑狼疮(SLE)患者外周血白细胞干扰素诱导蛋白 44(IFI44)基因实时定量表达水平与SLE临床表现及病情活动的相关性.方法 收集100例SLE患者,40例非SLE其他自身免疫性疾病患者,40名健康对照人群的临床资料,抽提外周血总RNA并逆转录成eDNA,运用SYBRgreen dve Ⅰ实时定量聚合酶链反应(RT-PCR)检测患者和对照组的IFI44基因定量表达水平,并对其与各临床指标及病情活动度的相关性进行分析.数据分析采用方差分析,采用Pearson及Spearman检验进行相关性分析.结果 ①SLE患者组的IFI44拷贝数26.8±5.3明显高于非SLE组7.4±2.7(P=0.0012)和健康对照组5.2±2.0(P=0.005);而非SLE患者组与健康对照组差异无统计学意义.②SLE重度活动组患者IFI44表达量63.1±22.4明显高于非活动组9.2±1.8(P=0.000)和轻度活动组患者28.0±7.2(P=0.015).③SLE患者组的IFI44拷贝数与SLEDAI积分之间呈正相关(r=0.38,P=0.000),与尿蛋白定量(24 h)也呈正相关(r=0.42,P=0.000).结论 IFI44基因在SLE患者中有明显表达上调现象;检测IFI44的表达水平有助于判断SLE患者病情活动状况.

Abstract：

Objective To investigate the expression of interferon-induced protein 44 (IFI44) gene in the leukocytes of the peripheral blood samples from patients with systemic lupus erythematosus (SLE), and to evaluate the relationship between the expression level and disease activity. Methods Mononuclear cells in the peripheral blood samples from 100 SLE patients were compared with those of 40 disease controls and 40 healthy donors (HD) and the expression of the IFI44 was evaluated by quantitative real-time PCR.Comparisons between groups were performed with ANOVA, and the correlation analysis between the level of expression was higher in SLE patients than disease controls and healthy donors (26.8±5.3, 7.4±2.7, 5.2±2.0,respectively) (P=0.0012, P=0.005), but no difference was found between disease controls and healthy donors. Mild disease activity and the SLE patients with stable disease (63.1±22.4, 28.0±7.2, 9.2±1.8, respectively)and 24 hours urine protein level (r=0.42, P=0.000). Conclusion IFI44 is demonstrated to be highly expressed in SLE patients. The level of IFI44 may be a promising candidate biomarker for identifying SLE activity.

Interferon-induced protein 44 is correlated with clinical features of patients with systemic lupus erythematosus

Objective To investigate the expression of interferon-induced protein 44 (IFI44) gene in the leukocytes of the peripheral blood samples from patients with systemic lupus erythematosus (SLE), and to evaluate the relationship between the expression level and disease activity. Methods Mononuclear cells in the peripheral blood samples from 100 SLE patients were compared with those of 40 disease controls and 40 healthy donors (HD) and the expression of the IFI44 was evaluated by quantitative real-time PCR.Comparisons between groups were performed with ANOVA, and the correlation analysis between the level of expression was higher in SLE patients than disease controls and healthy donors (26.8±5.3, 7.4±2.7, 5.2±2.0,respectively) (P=0.0012, P=0.005), but no difference was found between disease controls and healthy donors. Mild disease activity and the SLE patients with stable disease (63.1±22.4, 28.0±7.2, 9.2±1.8, respectively)and 24 hours urine protein level (r=0.42, P=0.000). Conclusion IFI44 is demonstrated to be highly expressed in SLE patients. The level of IFI44 may be a promising candidate biomarker for identifying SLE activity.