Objective To investigate the expression of urinary galectin-3 binding protein(Gal-3BP)and V-set containing immunoglobulin domain 4(VSIG4)in urine from patient with systemic lupus erythematosus(SLE)and its relationship with disease activity and kidney injury.Methods A total of 105 SLE patients(SLE group)and 50 normal patients(control group)admitted to Danzhou People's Hospital were selected as the study objects.According to SLEDAI score,105 SLE patients were divided into mild active group(SLEDAI≤9 points,n=51),moderate active group(14 point≥SLEDAI≥10 points,n=29)and severe active group(SLEDAI ≥ 15 points,n=25).According to the degree of renal function impairment,they were divided into normal renal function group,mild renal function impairment group and moderate and severe renal function impairment group.Enzyme linked immunosorbent assay was used to detect the expressions of Gal-3BP and VSIG4.Multiple Logistic regression was applied to analyze the risk factors of kidney injury in SLE patients,and ROC curve was drawn to analyze the value of urinary Gal-3BP and VSIG4 levels in predicting kidney injury in SLE patients.Results The urinary Gal-3BP(251.38±46.75 ng/ml)and VSIG4(13.40±4.27 ng/ml)levels in the SLE group were higher than those in the control group(117.50±18.24 ng/ml,2.73±0.85ng/ml),and the differences were statistically significant(t=19.315,15.681,all P＜0.001).The higher the activity level of SLE patients,the higher the urinary Gal-3BP and VSIG4 levels,with severe activity group＞moderate activity group＞mild activity group,and the differences were statistically significant(F=23.416,17.380,all P＜0.001).The urinary Gal-3BP and VSIG4 levels in the moderate to severe renal function group and mild renal function group were higher than those in the normal renal function group(t=24.580,18.163,20.864,15.947),and the urinary Gal-3BP and VSIG4 levels in the moderate to severe renal function group were higher than those in the mild renal function group(t=19.837,11.215),and the differences were statistically significant(all P＜0.001),respectively.Multiple logistic regression analysis showed that elevated levels of urinary Gal-3BP(OR=3.472,95％CI:2.685～11.463)and VSIG4(OR=2.376,95％CI:1.842～9.105)were risk factors for renal injury in SLE patients(all P＜0.05).ROC curve analysis showed that the combination of Gal-3BP and VSIG4 had the highest area under the curve(95％confidence interval)[AUC(95％CI)]for predicting renal injury in SLE patients[0.909(0.846～0.973)],with an accuracy of 88.6％.Correlation analysis showed that the urinary Gal-3BP level was positively correlated with VSIG4 level(r=0.813,P＜0.05),and the levels of urinary Gal-3BP and VSIG4 were positively correlated with SCr,BUN,24-hour urine protein,anti-dsDNA antibodies,and SLEDAI scores(r=0.358～0.702,all P＜0.05),while urinary Gal-3BP and VS1G4 levels were negatively correlated with hemoglobin and eGFR in SLE patients(r=-0.479～-0.670,all P＜0.05).Conclusion Urinary Gal-3BP and VSIG4 levels are elevated in SLE patients,and their high expressions are related to disease activity and renal injury.The combination of the two have good value in predicting renal injury in SLE patients.
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