ABSTRACT
Objective:To explore the correlation between the level of serum free light chain and renal function indexes in patients with diabetic kidney disease (DKD).Methods:The clinical data of 120 patients with DKD (study group) and 80 patients with simple diabetes (diabetes group) in the Beijing Sixth Hospital from October 2017 to October 2020 were retrospectively analyzed. Five ml of fasting peripheral venous blood were collected, the levels of serum uric acid, creatinine, homocysteine (Hcy) and free light chain (including free light chain κ, free light chain λ, ratio of free light chain κ and free light chain λ and total free light chain) were detected, and the estimated glomerular filtration rate (eGFR) was calculated. The correlation between total free light chain and renal function indexes in patients with DKD was analysis by Pearson method.Results:The free light chain κ, free light chain λ, ratio of free light chain κ and free light chain λ, total free light chain, uric acid, creatinine and Hcy in DKD group were significantly higher than those in diabetes group: (33.92 ± 9.06) mg/L vs. (17.65 ± 4.72) mg/L, (17.52 ± 2.83) mg/L vs. (9.81 ± 3.20) mg/L, 1.93 ± 0.23 vs. 1.80 ± 0.25, (51.44 ± 12.31) mg/L vs. (27.46 ± 7.92) mg/L, (383.69 ± 96.11) μmol/L vs. (345.93 ± 93.94) μmol/L, (117.57 ± 22.39) μmol/L vs. (75.06 ± 14.73) μmol/L and (17.64 ± 5.76) μmol/L vs. (11.66 ± 5.46) μmol/L, the eGFR was significantly lower than that in diabetes group: (103.95 ± 22.58) ml/(min·1.73 m 2) vs. (142.65 ± 26.50) ml/(min·1.73 m 2), and there were statistical differences ( P<0.01). Pearson correlation analysis results showed that serum total free light chain in patients with DKD was positively correlated with uric acid, creatinine and Hcy ( r = 0.707, 0.709 and 0.820; P<0.01), and negatively correlated with eGFR ( r = -0.730, P<0.01). Conclusions:The expression level of serum free light chain is obviously increased in patients with DKD, it has a certain correlation with renal function indexes. It can be used as one of the evaluation indicators for disease monitoring.