目的 分析分泌型卷曲相关蛋白5(SFRP-5)、脂肪酸结合蛋白4(FABP4)在2型糖尿病(T2DM)伴干眼症病人血清和泪液中的表达及其与病情严重程度的相关性.方法 选取2020年12月至2021年12月唐山市眼科医院收治的T2DM病人145例,其中单纯T2DM病人84例168眼(T2DM组),伴干眼症病人61例122眼(T2DM伴干眼症组),另选取同期该院体检健康者50例100眼作为对照组.T2DM伴干眼症病人又分为轻度组(29例)、中度组(17例)、重度组(15例).利用酶联免疫吸附法测定所有受试者血清和泪液中SFRP-5、FABP4水平;相关性分析采用Pearson法或Spearman法;logistic回归分析影响T2DM病人干眼症发生的因素.结果 T2DM伴干眼症组、T2DM组血清和泪液SFRP-5水平均低于对照组(106.09±8.37、135.72±9.26比158.34±9.45,28.85±5.13、58.27±6.14比45.18±5.92),T2DM伴干眼症组低于T2DM组(P<0.05);T2DM伴干眼症组、T2DM组血清和泪液FABP4水平均高于对照组(70.63±6.59、58.27±6.14比45.18±5.92,15.91±3.76、10.28±3.58比7.72±3.29),T2DM伴干眼症组高于T2DM组(P<0.05).重度组、中度组血清和泪液SFRP-5水平(68.29±7.15、95.54±8.34比131.82±9.02,12.83±4.62、24.72±5.49比39.56±5.18)、泪膜破裂时间(BUT)、泪液分泌试验(SIT)低于轻度组,重度组低于中度组(P<0.05);重度组、中度组血清和泪液FABP4水平(84.56±6.83、73.18±6.94比61.93±6.27,25.64±4.19、17.15±3.86比10.16±3.47)及眼表疾病指数量表(OSDI)积分高于轻度组,重度组高于中度组(P<0.05).T2DM伴干眼症病人血清与泪液SFRP-5水平呈正相关,血清与泪液FABP4水平也呈正相关(P<0.05).T2DM伴干眼症病人血清和泪液SFRP-5水平与OSDI积分均呈负相关,与BUT、SIT均呈正相关(P<0.05);血清和泪液FABP4水平与OSDI积分均呈正相关,与BUT、SIT均呈负相关(P<0.05).血清和泪液SFRP-5水平是影响T2DM病人干眼症发生的独立保护因素,而血清和泪液FABP4水平是独立危险因素(P<0.05).结论 SFRP-5在T2DM伴干眼症病人血清和泪液中均低表达,FABP4均高表达,二者与病情严重程度密切相关.
Objective To analyze the expression of secreted frizzled-related protein 5(SFRP-5)and fatty acid-binding protein 4(FABP4)in the serum and tear fluid of patients with type 2 diabetes mellitus(T2DM)accompanied by dry eye disease and their correla-tion with the severity of the disease.Methods From December 2020 to December 2021,145 T2DM patients admitted to Tangshan Eye Hospital were selected,including 168 patients with simple T2DM(T2DM group),61 patients with dry eye(T2DM with dry eye group),and 50 patients of healthy people who had medical checkups during the same period as the control group.T2DM patients with dry eye were divided into mild group(29 cases),moderate group(17 cases)and severe group(15 cases).The levels of SFRP-5 and FABP4 in se-rum and tear fluid were measured by enzyme-linked immunosorbent assay.The Pearson method or Spearman method was used for corre-lation analysis.Logistic regression analysis was used to analyze the factors influencing the occurrence of dry eye in T2DM patients.Re-sults The levels of SFRP-5 in serum and tear fluid were lower in the T2DM with dry eye group and the T2DM group than in the con-trol group(106.09±8.37,135.72±9.26 vs.158.34±9.45;28.85±5.13,58.27±6.14 vs.45.18±5.92)and lower in the T2DM with dry eye group than in the T2DM group(P<0.05).The levels of FABP4 in serum and tear fluid in T2DM with dry eye group and T2DM group were higher than those in the control group(70.63±6.59,58.27±6.14 vs.45.18±5.92;15.91±3.76,10.28±3.58 vs.7.72±3.29)and were higher in the T2DM with dry eye group than in the T2DM group(P<0.05).The serum and tear fluid SFRP-5 levels(68.29±7.15,95.54±8.34 vs.131.82±9.02;12.83±4.62,24.72±5.49 vs.39.56±5.18),tear film rupture time(BUT)and tear secretion test(SIT)in the severe and moderate groups were lower than those in the mild group,and those in the severe group were lower than the moderate group(P<0.05).The serum and tear FABP4 levels(84.56±6.83,73.18±6.94 vs.61.93±6.27;25.64±4.19,17.15±3.86 vs.10.16±3.47)and ocular surface disease index(OSDI)score in the severe and moderate groups were higher than those in the mild group,and those in the severe group were higher than those in the moderate group(P<0.05).There was a positive correlation between serum and tear fluid SFRP-5 lev-els,and a positive correlation between serum and tear fluid FABP4 levels in patients with T2DM with dry eye(P<0.05).The serum and tear fluid SFRP-5 levels in T2DM patients with dry eye were negatively correlated with the OSDI scores and positively correlated with the BUT and the SIT(P<0.05).Both serum and tear fluid FABP4 levels were positively correlated with OSDI scores and negatively cor-related with BUT and SIT scores(P<0.05).Serum and tear fluid SFRP-5 levels were independent protective factors affecting the occur-rence of dry eye in T2DM patients,while serum and tear fluid FABP4 levels were independent risk factors(P<0.05).Conclusion SFRP-5 was lowly expressed at low levels,and FABP4 was highly expressed in both the serum and tear fluid of patients with T2DM with dry eye,both of which are closely related to the severity of the disease.