Anti-C1q antibodies and antiendothelial cell antibodies in systemic lupus erythematosus – relationship with disease activity and renal involvement

The aim of this study was to investigate the relationship between the presence and titre of antibodies against C1q (anti-C1q Ab) and disease activity and renal involvement in patients with systemic lupus erythematosus (SLE). Anti-C1q Ab were measured in 79 patients with SLE (70 women and 9 men; mean age 41.7 years; mean disease duration 8.4 years): 19 patients had active disease with lupus nephritis, 8 active disease without nephritis, 26 inactive disease with nephritis and 26 inactive disease without nephritis. Anti-dsDNA antibodies (EIA and immunofluorescence), antiendothelial cell antibodies (AECA) and complement levels (C3, C4, total haemolytic complement activity) were determined in parallel. Anti-C1q Ab were positive in 49%, anti-dsDNA Ab in 61% and AECA in 19% of the patients, respectively. Significantly higher titres of anti-C1q Ab were found in patients with active disease compared with those with inactive SLE (P < 0.01). Serum levels of anti-C1q Ab showed a positive correlation with anti-dsDNA Ab and SLEDAI score (P < 0.01) and a negative correlation with C3 (P < 0.05), C4 (P < 0.01) and CH50U (P < 0.01). The presence of anti-C1q Ab was not different between patients with or without nephritis. In patients with (P < 0.05) and without nephritis (P < 0.01) the frequency of anti-C1q Ab was significantly higher in active patients compared with inactive patients. Both anti-C1q and anti-ds-DNA Ab were detectable in 74% of patients with active nephritis but only in 30% of all other patients (P=0.001). None of the patients with active nephritis was negative for anti-C1q and anti-dsDNA Ab, whereas 37% of the patients without active nephritis were negative for both antibodies (P < 0.01). Sensitivity, specificity, positive and negative predictive values for active lupus nephritis among SLE patients were 100%, 50%, 51.9% and 100% for anti-dsDNA Ab (EIA) and 74%, 70%, 57% and 89.4% for positive findings of both anti-dsDNA and anti-C1q Ab. The presence and titre of anti-C1q-Ab in SLE are related to disease activity. Absence of anti-dsDNA Ab excludes active nephritis; positive findings of both anti-dsDNA Ab and anti-C1q Ab are of relatively high specificity for active nephritis.     

Relationship of Circulating Anti-C3b and Anti-C1q IgG to Lupus Nephritis and Its Flare

Background and objectives

Autoantibodies to complement C1q (anti-C1q) are associated with the diagnosis of lupus nephritis. In this study, we compare anti-C1q IgG with another complement autoantibody, anti-C3b IgG, as a biomarker of lupus nephritis and lupus nephritis flare.

Design, setting, participants, & measurements

Our investigation involved the Ohio SLE Study, a prospective observational cohort of patients with recurrently active lupus who were followed bimonthly. Serum anti-C1q and anti-C3b IgG levels were assessed cross-sectionally by ELISA in 40 normal controls and 114 patients in the Ohio SLE Study (41 nonrenal and 73 lupus nephritis) at study entry, and longitudinally in a subset of patients in the Ohio SLE Study with anti-C1q–positive lupus nephritis in samples collected every 2 months for 8 months leading up to lupus nephritis flare (n=16 patients).

Results

In the cross-sectional analysis, compared with anti-C1q IgG, anti-C3b IgG was less sensitive (36% versus 63%) but more specific (98% versus 71%) for lupus nephritis. Only anti-C3b IgG was associated with patients with lupus nephritis who experienced at least one lupus nephritis flare during the Ohio SLE Study period (P<0.01). In the longitudinal analysis, circulating levels of anti-C1q IgG increased at the time of lupus nephritis flare only in patients who were anti-C3b positive (P=0.02), with significant increases occurring from 6 (38% increase) and 4 months (41% increase) before flare. Anti-C3b IgG levels also trended up at lupus nephritis flare, although the change did not reach statistical significance (P=0.07). Neither autoantibody increased 2 months before flare.

Conclusions

Although not as prevalent as anti-C1q IgG, anti-C3b IgG showed nearly complete specificity for lupus nephritis. The presence of anti-C3b IgG identified patients with lupus nephritis who were prone to flare and in whom serial measurements of markers associated with complement, such as anti-C1q IgG, may be useful to monitor lupus nephritis activity.     

Anti-chromatin and anti-C1q antibodies in systemic lupus erythematosus compared to other systemic autoimmune diseases

OBJECTIVE: To evaluate the prevalence, sensitivity, and specificity of anti-chromatin and anti-C1q antibodies in systemic lupus erythematosus (SLE) and lupus nephritis compared to small vessel vasculitis and other connective tissue diseases. To provide long-term follow-up data for anti-chromatin antibodies in lupus nephritis. METHODS: We determined the significance of anti-nuclear antibodies (ANA), anti- double-stranded DNA (anti-dsDNA), anti-chromatin, and anti-C1q antibodies, as well as complement factors C3 and C4, in relation to disease activity in SLE patients with (n = 47; long-term follow-up data for 33 patients) and without (n = 31) biopsy-confirmed lupus nephritis, microscopic polyangiitis (n = 37), Wegener's granulomatosis (n = 66), primary Sj?gren's syndrome (n = 17), limited scleroderma (CREST syndrome) (n = 6), and progressive systemic scleroderma (PSS) (n = 11). RESULTS: Anti-chromatin antibodies were more specific and sensitive than anti-C1q antibodies in distinguishing SLE patients from those with other systemic autoimmune diseases [anti-chromatin: sensitivity 64.1%, specificity 99.2%, odds ratio (OR) 219.6; anti-C1q: sensitivity 50%, specificity 72.6%, OR 2.65]. Anti-C1q antibodies were present in 75% of patients with Sj?gren's syndrome and 35.1% of patients with microscopic polyangiitis. Anti-chromatin antibodies could identify SLE in patients with positive ANA but negative anti-dsDNA antibodies. Persisting anti-chromatin antibodies indicated SLE disease activity, even if anti-dsDNA antibodies had become negative. In long-term follow-up, those SLE patients with negative anti-dsDNA antibodies but persisting ANA and anti-chromatin antibodies relapsed if immunosuppression had been tapered. Anti-chromatin antibodies correlated with the SLE disease activity index (SLEDAI) as a marker of disease activity. CONCLUSIONS: The measurement of anti-chromatin, but not anti-C1q, antibodies in patients with systemic autoimmune diseases increases diagnostic sensitivity and specificity for SLE and assists in treatment decisions in anti-dsDNA-negative patients.     

三种自身抗体联合检测对狼疮疾病活动和狼疮肾炎的价值

目的探讨联合检测抗C1q抗体、抗核小体抗体(AnuA)和抗dsDNA抗体对狼疮活动和狼疮肾炎(LN)的价值。方法 90例系统性红斑狼疮(SLE)分为疾病活动和疾病稳定组、LN和非LN组, 酶联免疫吸附试验(ELISA)检测血清抗C1q抗体和AnuA水平,间接免疫荧光法比较三抗体单个和联合对疾病活动和LN的价值。结果抗C1q抗体、AnuA和抗dsDNA抗体阳性对疾病活动的敏感性分别为 71．4％、75．0％和66．1％,特异性分别为75．5％、70．6％和88．2％;抗dsDNA抗体阴性患者分别有36．7％抗 C1q抗体阳性和26．5％AnuA阳性。疾病活动组三抗体阳性率和抗体水平显著高于疾病稳定组;三抗体与 SLE疾病活动指数(SLEDAI)、血沉(ESR)、IgG、球蛋白水平显著正相关,与C3、C4及白蛋白水平显著负相关。LN组三抗体水平显著高于非LN组。结论三抗体都是狼疮疾病活动的指标,都与LN有关,联合检测可以提高疾病活动检出率。     

Anti-C1q antibodies in nephritis: correlation between titres and renal disease activity and positive predictive value in systemic lupus erythematosus

OBJECTIVE: To investigate antibodies to complement 1q (anti-C1q) and investigate the correlation between anti-C1q titres and renal disease in systemic lupus erythematosus (SLE). METHODS: 151 SLE patients were studied. In patients with biopsy proven lupus nephritis (n = 77), activity of renal disease was categorised according to the BILAG renal score. Sera were tested for anti-C1q by enzyme immunoassay. Serum samples were randomly selected from 83 SLE patients who had no history of renal disease, and the positive and negative predictive value of the antibodies was studied. RESULTS: Patients with active lupus nephritis (BILAG A or B) had a higher prevalence of anti-C1q than those with no renal disease (74% v 32%; relative risk (RR) = 2.3 (95% confidence interval, 1.6 to 3.3)) (p<0.0001). There was no significant difference in anti-C1q prevalence between SLE without nephritis and SLE with non-active nephritis (BILAG C or D) (32% v 53%, p = 0.06) or between active and non-active nephritis (74% v 53%, p = 0.06). Patients with nephritis had higher anti-C1q levels than those without nephritis (36.0 U/ml (range 4.9 to 401.0) v 7.3 U/ml (4.9 to 401.0)) (p<0.001). Anti-C1q were found in 33 of 83 patients (39%) without history of renal disease. Nine of the 33 patients with anti-C1q developed lupus nephritis. The median renal disease-free interval was nine months. One patient with positive anti-C1q was diagnosed as having hypocomplementaemic urticarial vasculitis syndrome during follow up. CONCLUSIONS: Anti-C1q in SLE are associated with renal involvement. Monitoring anti-C1q and their titres in SLE patients could be important for predicting renal flares.     

血清C1q抗体水平与系统性红斑狼疮活动性和狼疮肾炎的关系

目的分析探讨血清C1q抗体水平与系统性红斑狼疮（SLE）活动性以及狼疮肾炎之间的关系。方法采用ELISA方法检测92例SLE患者C1q抗体水平。并与其他SLE活动性指标进行相关分析。结果SLE患者C1q抗体阳性率为67.4%。活动性狼疮组的C1q抗体阳性率及C1q抗体水平显著高于非活动性狼疮组（P〈0.001）。活动性狼疮肾炎组C1q抗体阳性率（P〈0.05）和C1q抗体水平（P〈0.01）显著高于非活动性狼疮肾炎组。联合抗dsDNA抗体检测,没有1例活动性狼疮肾炎患者的C1q抗体和抗dsDNA抗体同时阴性。结论血清C1q抗体与狼疮活动以及活动性狼疮肾炎关系密切,C1q抗体的检测有助于活动性狼疮的诊断,联合抗dsDNA抗体的检测是活动性狼疮肾炎的特异性检测指标。     

Prevalence and clinico-serological correlations of anti-alpha-enolase, anti-C1q, and anti-dsDNA antibodies in patients with systemic lupus erythematosus

OBJECTIVE: To evaluate the prevalence and clinico-serological correlations of anti-enolase, anti-C1q, and anti-dsDNA antibodies in patients with systemic lupus erythematosus (SLE). METHODS: Sixty-eight sera randomly obtained from SLE patients were examined. Anti-alpha-enolase antibodies were detected by immunoblot on recombinant protein; anti-C1q and anti-dsDNA antibodies were detected using an ELISA. RESULTS: Anti-alpha-enolase, anti-C1q, and anti-dsDNA antibodies were positive in 21%, 62%, and 63% of patients, respectively. A correlation was found between anti-dsDNA and anti-C1q antibodies, while anti-enolase antibodies did not correlate with the other 2 specificities. Anti-alpha-enolase antibodies were not correlated with any of the clinical and serological variables examined. Anti-C1q antibodies were correlated with ECLAM score, leukopenia, complement levels, and active renal involvement. Anti-dsDNA antibodies correlated with arthritis, leukopenia, complement levels, and the presence of renal involvement, independent of activity. In patients with active renal disease anti-dsDNA antibodies were correlated with a poor renal outcome, occurring after a mean period of 24 months. CONCLUSION: These data suggest the association of anti-C1q antibodies with disease flares and active renal disease in SLE. The observed association of anti-dsDNA antibodies and renal disease was expected. Further analysis is required to fully assess the clinical significance of anti-a-enolase antibodies.     

Simultaneous detection of anti-C1q and anti-double stranded DNA autoantibodies in lupus nephritis: predictive value for renal flares

Clinical difficulties in predicting systemic lupus erythematosus (SLE) renal flares are still encountered. Biological markers such as autoantibodies (aAbs) may be of major interest for clinicians in the follow-up of SLE patients. The aim of our study was to investigate the clinical utility of one of these biological markers, anti-C1q aAbs, in predicting renal flares of SLE nephritis in comparison with the 'gold standard' anti-double stranded DNA (anti-dsDNA) aAbs. Anti-C1q aAbs and anti-dsDNA aAbs were analysed through a longitudinal retrospective study of 23 SLE patients presenting with one or more renal flares. Anti-C1q and/or anti-dsDNA aAbs were found in 20 (87%) of 23 patients, of whom 16 (69%) displayed both. Thirty-three renal flares occurred during the course of the study, and anti-C1q aAbs and anti-dsDNA aAbs were positive in 25 (76%) and 24 (73%) of these flares respectively. The sensitivity of anti-C1q and/or anti-dsDNA aAbs in predicting renal flares reached 85%. The specificity of anti-C1q aAbs was 84%, of anti-dsDNA aAbs 77% and of both aAbs 97%. Positive and negative predictive values were as follows: 56% and 70% for anti-C1q aAbs, 53% and 72% for anti-dsDNA aAbs. The combination of both aAbs had the highest positive predictive value (69%), whereas absence of both aAbs was associated with the highest negative predictive value (74%). In conclusion, our results confirm that anti-C1q aAbs are present in a significant percentage of SLE patients with active renal involvement, suggesting that these aAbs could be a useful additional marker. The presence of anti-C1q and anti-dsDNA aAbs was associated with a high risk of renal flare, whereas the absence of both aAbs excluded such an event. These data confirm that systematic detection of anti-C1q and anti-dsDNA aAbs is of interest for the follow-up in SLE patients with renal involvement.     

抗C1q抗体与系统性红斑狼疮疾病活动及狼疮肾炎的关系

目的研究抗C1q抗体与系统性红斑狼疮（systemic lupus erythematosus,SLE）疾病活动及肾损害的相关性。方法使用ELISA法测定93例初诊SLE患者和69例其他风湿性疾病患者及32名健康对照者血清中抗C1q抗体的浓度。同时记录SLE疾病活动指数（systemic lupus erythematosus Disease Activity Index,SLEDAI）、自身抗体和相关实验室指标。结果血清抗C1q抗体、抗dsDNA抗体、抗核小体抗体（anti-nucleosome antibodies,AnuA）,SLE组的阳性率分别为40.9%、62.4%和62.8%。血清抗C1q抗体阳性组患者的肾损害发生率（84.2%）明显高于阴性组（23.6%）。狼疮肾炎（lupus nephritis,LN）患者血清抗C1q抗体浓度（55.36±51.96）RU/ml及阳性率（71.1%）显著高于无肾炎表现的狼疮对照组（12.09±14.46）RU/ml,12.5%。无论患者有无肾损害,狼疮疾病活动患者抗C1q抗体浓度（62.46±50.29）RU/ml及阳性率（85.7%）显著高于疾病稳定的狼疮对照组（8.79±6.42）RU/ml,3.9%。而AnuA和抗dsDNA抗体只在伴有狼疮肾损害的疾病活动组即活动LN的阳性率（87.9%与50.0%）显著高于非活动LN对照组（66.7%与33.3%）。LN组抗C1q抗体、AnuA、抗dsDNA和抗Sm（Smith）抗体阳性率显著高于非LN组（71.1%与12.5%）,（77.8%与47.9%）,（57.8%与25.0%）,（31.1%与10.4%）。SLE疾病活动组抗C1q抗体、AnuA、抗dsDNA阳性率显著高于疾病稳定组（85.7%与3.9%）,（88.1%与41.2%）,（61.9%与17.6%）。活动LN抗C1q抗体、AnuA、抗dsDNA阳性率显著高于非活动LN（93.9%与8.3%）,（87.9%与50.0%）,（66.7%与33.3%）。活动LN组抗C1q抗体、AnuA、抗dsDNA及抗中性粒细胞胞质抗体（ANCA）阳性率显著高于其他SLE组（93.9%与13.1%）,（87.9%与48.3%）,（66.7%与26.7%）,（43.5%与8.5%）。结论血清抗C1q抗体能够反映SLE的疾病活动,并与SLE肾损害相关,是对活动性LN敏感的自身抗体。     

Anti-C1q antibodies in pregnant patients with systemic lupus erythematosus

OBJECTIVE: To study anti-C1q antibodies in pregnant patients with systemic lupus erythematosus (SLE) and to evaluate their prognostic significance for the occurrence of disease flares or pregnancy complications. METHODS: Twenty-one pregnancies in 19 SLE patients prospectively followed were analyzed. Disease activity was evaluated on the basis of the physician's intention to treat and a modified version of the ECLAM index. Anti-C1q and anti-dsDNA antibodies were detected in the sera by an ELISA assay. Antinuclear antibodies, anti-ENA antibodies, anticardiolipin antibodies and lupus anticoagulant were also performed. RESULTS: In all the patients the disease was inactive at the beginning of the pregnancy. Four flares of disease activity were observed in 4 pregnancies (19%) and obstetric complications were encountered in 7 pregnancies (43%). Anti-C1q antibodies were positive in 4 (19%) pregnancies and anti-dsDNA antibodies in 8 (38%). The presence of anti-phospholipid antibodies at the first assessment was correlated with the occurrence of obstetric complications (p<0.05). The presence of anti-C1q and anti-dsDNA antibodies at the first assessment had no prognostic significance for the occurrence of flares or obstetric complications during the course of pregnancy. Although the small number of patients studied did not allow for statistically significant analysis, flares appeared to be more likely to occur in patients presenting with anti-dsDNA or anti-C1q antibodies during pregnancy compared to patients with no changes in these antibody titers (43% vs 8% respectively). CONCLUSIONS: The presence of anti-C1q and anti-dsDNA antibodies does not seem to be prognostic for the occurrence of flares during pregnancy. Further studies are warranted to explore this possibility.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.     

末端补体SC5b-9抗C1q抗体及补体C3 C4在狼疮疾病活动性判定中的价值

目的 探讨末端补体SC5b-9、抗C1q抗体及补体C3和C4在狼疮疾病活动性判定中的价值.方法 采用酶联免疫吸附试验(ELISA)检测系统性红斑狼疮(SLE)组62例、疾病对照组35例和健康对照组35名血清中的末端补体SC5b-9和抗C1q抗体水平,并检测血清中补体C3和C4的水平,并与SLE患者临床表现、病情活动度及狼疮肾炎(LN)的病理分型进行相关性分析.结果 在SLE活动组中末端补体SC5b-9和抗C1q抗体水平均显著高于各对照组(均P<0.05).末端补体SC5b-9和抗C1q抗体与补体C3、C4呈负相关(P<0.05),与SLE疾病活动指数(SLEDAI)呈正相关(P<0.05).联合检测对疾病活动的判断的敏感性和特异性分别为95%和98%.末端补体SC5b-9及抗C1q抗体在狼疮增殖件肾炎中表达明显高于膜性肾炎(均P<0.05).结论 联合检测可提高疾病诊断和活动性判断的特异性和敏感性;末端补体SC5b-9和抗C1q抗体参与了狼疮增殖性肾炎的免疫发病机制.