目的：初步研究可溶性 klotho（s-kl）在系统性红斑狼疮（SLE）和狼疮性肾炎（LN ）中的变化及其意义。方法收集34例首诊首治 SLE 患者，根据是否合并 LN 分为 SLE 不合并 LN 组（SLE 组，19例）和合并 LN 组（LN 组，15例），将17例常规体检者列为对照组。常规检测24 h 尿蛋白定量（24 h Upro）、血常规、血生化指标和双链 DNA（dsDNA）。采用 ELISA 法检测 s-kl 、25羟基维生素 D（25-OH-D）和成纤维细胞生长因子-23（FGF-23）。对 SLE 组和 LN 组患者进行 SLE 疾病活动度评分（SLEDAI），根据 Cockcroft-Gault 公式计算内生肌酐清除率（CCr）。比较3组间差异并对相关指标进行相关性分析。结果在 SLE 组和 LN组中平均动脉压、血常规、酶学[肌酸激酶（CK）和乳酸脱氢酶（LDH）]、补体（补体 C3和补体 C4）及 dsDNA 与对照组比较差异有统计学意义（P＜0．05）。与对照组及 SLE 组比较，LN 组24 h Upro 、血脂[总胆固醇（CHOL），三酰甘油（TG）]和血肌酐（SCr）显著升高，而血清清蛋白（ALB）和 CCr 明显下降，差异有统计学意义（P＜0．05）。SLE 组与对照组 s-kl 、25-OH-D 和 FGF-23比较差异无统计学意义（P＞0．05）；而在 LN 组中 s-kl 、25-OH-D 及 FGF-23血清水平与对照组和 SLE 组比较，差异有统计学意义（P＜0．05）。 LN 组患者 SLEDAI 评分较 SLE 组评分高（P ＜0．05）。相关分析表明，s-kl 与25-OH-D 、C3及 C4存在正相关关系，与FGF-23、SLEDAI 和 dsDNA 存在负相关关系（均 P ＜0．05）。回归分析提示，s-kl 、25-OH-D 和 FGF-23与 SLE 活动度无明显关系。结论 SLE 和 LN 患者体内 s-kl 水平的降低，可能是引起 FGF-23升高的关键因素之一，由此进一步导致 SLE 和 LN 患者维生素 D（VitD）缺乏和病情活动。%Objective To investigate the serum concentration of soluble klotho (s-kl) in systemic lupus erythematosus (SLE) and lupus nephritis (LN) ,and elucidate its role in SLE and LN .Methods A total of 34 patients ,definitely diagnosis as SLE with un-treatment firstly ,were enrolled in this study .The patient were divided into two groups ,those who complicated with LN were assigned to LN group (15 cases) ,the others were distributed to SLE group (19 cases) .At the same time ,17 cases of routine physical examination people were take as control group .24 hours urine of all the cases was collected for examining urinary protein (Upro) .Routine hemocyte analysis ,serum biochemical parameters and ANA and dsDNA were measured by routine method .ELISA was used to detect s-kl ,25-hydroxy vitamin D (25-OH-D) and fibroblast grow th factor-23 (FGF-23) .Systemic lupus erythematosus disease activity index (SLEDAI) was performed in SLE and LN group ,and the creatinine clearance rate(CCr)was calculated accord-ing to the Cockcroft-Gault formula .Pearson′s and linear regression were applied to analyisis the correlation of relevant parameters . Results As compared with the control group ,there were statistically significant differences in mean arterial pressure ,blood rou-tine ,creatine kinase (CK) and lactate dehydrogenase (LDH ) ,complement (C3 and C4 ) and dsDNA in SLE and LN group (P <0 .05) .The level of Upro/24 h ,lipids (CHOL and TG) and creatinine (Scr) in LN group was significantly higher ,while serum al-bumin (ALB) and CCr were obviously lower than those in SLE group and control goup(P< 0 .05) .Difference of s-kl ,25-OH-D and FGF-23 in serum were not observed between SLE and control gropu(P> 0 .05) ,but the serum level of s-kl ,25-OH-D and FGF-23 in LN group were showed a statistical significance when compared with SLE or control group(P< 0 .05) .Meanwhile ,the SLEDAI score was higher in LN than in SLE group(P< 0 .05) .Correlation analysis indicted that s-kl exhibited a positive relationship with 25-OH-D ,C3 and C4 ,while showed a negative correlation with FGF-23 ,SLEDAI and dsDNA(all P< 0 .05) .However ,no any corre-lationt was revealed in regression analysis between the s-kl ,25-OH-D ,FGF-23 and the lupus activity .Conclusion The decrease of s-kl maybe one of the pivotal factors that up-regulated the level of FGF-23 in SLE and LN patients ,thus lead to the deficiency of vi-tamin D and lupus activity .
展开▼
