血清可溶性Klotho蛋白、肌腱蛋白-C与IgA肾病患儿病情严重程度及氧化应激的相关性

Correlation of serum soluble Klotho protein and tendino-C with severity of disease and oxidative stress in children with IgA nephropathy

目的 分析血清可溶性Klotho蛋白(sKL)、肌腱蛋白-C(TN-C)与免疫球蛋白A(IgA)肾病患儿病情严重程度及氧化应激的相关性。方法 选取2019年7月至2022年8月就诊于该院的85例IgA肾病患儿作为IgA肾病组,另选取同期在该院体检的85例健康者作为健康组,对比两组血清sKL、TN-C水平,绘制受试者工作特征(ROC)曲线分析血清sKL、TN-C及二者联合预测IgA肾病发生的价值。IgA肾病组按照24 h尿蛋白定量又分为轻度组(28例)、中度组(39例)、重度组(18例),对比3组血清sKL、TN-C水平及氧化应激指标[丙二醛(MDA)、超氧化物歧化酶(SOD)、终末氧化蛋白产物(AOPP)],经Spearman等级相关性分析血清sKL、TN-C水平与氧化应激指标的相关性,经Kendall的Tau-b检验血清sKL、TN-C水平与IgA肾病患儿的病情严重程度关系。结果 IgA肾病组血清sKL水平比健康组低,TN-C水平比健康组高,差异有统计学意义(P<0.05)。绘制ROC曲线发现,血清sKL、TN-C及二者联合预测IgA肾病发生的曲线下面积及95%CI为0.726(95%CI:0.648~0.803)、0.853(95%CI:0.796~0.909)、0.891(95%CI:0.845~0.937)。重度组血清sKL水平低于中度组、轻度组,而血清TN-C水平高于中度组、轻度组,差异有统计学意义(P<0.05)。重度组血清SOD水平低于中度组、轻度组,血清AOPP、MDA水平高于中度组、轻度组,差异有统计学意义(P<0.05)。Spearman等级相关性显示,sKL水平与SOD呈正相关(r>0,P<0.05),与AOPP、MDA呈负相关(r<0,P<0.05);TN-C水平与SOD呈负相关(r<0,P<0.05),与AOPP、MDA呈正相关(r>0,P<0.05)。结论 IgA肾病患儿血清sKL、TN-C水平与IgA肾病患儿病情严重程度、氧化应激反应有关,且二者联合可有效预测IgA肾病的发生。

Objective To analyze the correlation between serum soluble Klotho protein(sKL)and tendino-C(TN-C)and the severity of disease and oxidative stress in children with immunoglobulin A(IgA)nephropathy.Methods A total of 85 children with IgA nephropathy admitted to the hospital from July 2019 to August 2022 were selected as IgA nephropathy group,and 85 healthy patients who underwent physical examination in the hospital during the same period were selected as healthy group.Serum sKL and TN-C levels were compared between the two groups.Receiver operating characteristic(ROC)curve was drawn to analyze the value of serum sKL,TN-C and their combination in predicting the occurrence of IgA nephropathy.IgA nephropathy group was divided into mild group(28 cases),moderate group(39 cases)and severe group(18 cases)according to 24 h urinary protein quantity.Serum sKL,TN-C levels and oxidative stress indexes[malondialdehyde(MDA),superoxide dismutase(SOD)and advanced oxidation protein product(AOPP)]of the three groups were compared.The correlation between serum sKL and TN-C levels and oxidative stress indexes was analyzed by Spearman correlation,and the correlation between serum sKL and TN-C levels and the severity of IgA nephropathy in children was examined by Kendall′s Tau-b.Results The serum sKL level in IgA nephropathy group was lower than that in healthy group,and the serum TN-C level was higher than that in healthy group,the difference was statistically significant(P<0.05).ROC curve showed that the area under the curve and 95%CI of serum sKL,TNC and their combination predicted the occurrence of IgA nephropathy were 0.726(95%CI:0.648—0.803),0.853(95%CI:0.796—0.909)and 0.891(95%CI:0.845—0.937).The level of serum sKL in severe group was lower than that in moderate and mild groups,while the level of serum TN-C was higher than that in moderate and mild groups,and the difference was statistically significant(P<0.05).The serum SOD level of severe group was lower than that of moderate group and mild group,and the serum AOPP and MDA levels were higher than those of moderate group and mild group,the difference was statistically significant(P<0.05).Spearman correlation showed that sKL level was positively correlated with SOD(r>0,P<0.05),and negatively correlated with AOPP and MDA(r<0,P<0.05).TN-C level was negatively correlated with SOD(r<0,P<0.05),and positively correlated with AOPP and MDA(r>0,P<0.05).Conclusion The levels of serum sKL and TN-C in children with IgA nephropathy are related to the severity of disease and oxidative stress,and the combination of SKL and TN-C can effectively predict the occurrence of IgA nephropathy.