血清和唾液抗α-胞衬蛋白抗体检测及其在干燥综合征中的意义

目的 了解抗α-胞衬蛋白(α-fodrin)抗体在干燥综合征(SS)患者血清和唾液中的水平,探讨其在诊断中的意义及与临床指标的关系.方法 以酶联免疫吸附试验(ELISA)定量测定25例原发性干燥综合征(pSS)、14例继发性干燥综合征(sSS)、23例其他结缔组织病(CTD)患者、10名健康人血清及唾液中的抗α-fodrin抗体.结果 pSS、sSS血清及唾液中抗α-fodrin IgA、IgG抗体水平高于其他CTD组及正常对照组,差异有统计学意义(P<0.01),其余各组间比较阳性率差异无统计学意义(P>0.05).抗α-fodfin IgA型和lgG型抗体检测阳性率在pSS血清及唾液中分别为60%、44%及43%、29%,在sSS分别为52%、36%及36%、29%,在其他结缔组织病血清IgA型和IgG型抗体分别为22%、17%;其他CTD组唾液及正常对照组血清及唾液中均无一例抗α-fodrin阳性.抗α-fodrin IgA对SS诊断的敏感性为54%,特异性为85%;39例sS患者抗α-fodrin IgA和IgG抗体敏感性低于抗SSA抗体而高于抗SSB抗体,但差异无统计学意义(P＞0.05).抗α-fodrin抗体的出现与口干、腮腺肿大有关(P<0.05);与眼干、肺间质病变、肾小管酸中毒、肝损害发生率无关(P>0.05).结论 抗α-fodrin抗体在血清和唾液的检测对SS诊断有一定意义,可作为SS诊断的筛选指标.

Value of serum and saliva anti-α-fodrin antibodies in patients with sjfigren's syndrome

Objective To evaluate the value of IgA and IgG antibodies against α-fodrin in both serum antibodies in SS is also assessed.Methods Samples from 39 patients with SS(25 primary and 14 secondary),8 patients with systemic lupus erythematosus(SLE),and 15 patients with rheumatoid arthritis (RA)as well as 10 healthy blood donors were collected.Anti-α-fodrin antibodies were measured using ELISA.Results The titer of serum anti-α-fodrin was higher in SS than in other connective tissue diseases group and healthy group(P<0.01).IgA type anti-α-fodrin antibodies was detected in 60%.44% of serum and saliva in patients with pSS respectively.IgG antibodies were detected in 43% of sera,and 29% of saliva of patients with pSS.The sensitivity and specificity of serum anti-α-fodrin IgA in SS was 54%and 85%.The level of anti-α-fodrin was positively associated with xerostomia and parotid swelling (P<0.05),and was negatively associated with xeroma,renal tubule acidosis,lung interstitial disease and hepatic damages(P>0.05).Conclusion Saliva and serLlm anti-α-fodrin level may be diagnostic for SS.It may be a useful screening marker.