侵袭性牙周炎患者抗伴放线聚集杆菌血清c型IgG滴度分析

目的：分析侵袭性牙周炎（aggressive periodontitis, AgP）患者血清中的抗伴放线聚集杆菌（Aggregatibacter actinomycetemcomitans, Aa）血清c型IgG抗体滴度及其影响因素。方法：采集62例AgP患者（18例切磨牙型，44例广泛型）和45例牙周健康者的空腹静脉血，同时收集AgP患者的龈下菌斑和非刺激性全唾液用于Aa的检测（PCR方法），应用酶联免疫吸附方法测定血清中抗Aa血清c型IgG抗体滴度。结果：AgP组和健康对照者血清中的抗Aa血清c型IgG抗体检出率均为100%，AgP组的抗体滴度为11.1±1.9，显著高于健康对照组（9.1±1.8，P<0.01）。切磨牙型AgP患者的抗Aa血清c型的IgG抗体滴度和抗体升高率与广泛型比较差异无统计学意义。唾液或龈下菌斑样本Aa检出阳性的AgP患者抗体滴度显著高于Aa阴性患者（11.9±1.3 vs. 10.7±2.1, P<0.05）。结论：Aa血清c型为我国AgP患者定植的Aa的重要血清型，广泛型AgP患者血清抗Aa抗体滴度与切磨牙型AgP患者无明显差异。

Analysis of serum IgG titers to Aggregatibacter actinomycetemcomitans serotype c in aggressive periodontitis patients

Objective:To analyze the serum IgG titers to Aggregatibacter actinomycetemcomitans ( Aa ) and associated factors in patients with aggressive periodontitis (AgP).Methods:Venous blood samples were collected from 62 AgP patients and 45 periodontal healthy controls , unstimulated whole saliva and pooled subgingival plaque samples of AgP patients were also collected for the detection of Aa ( PCR method) .Serum IgG titers to Aa serotype c were measured by enzyme-linked immunosorbnent assay ( ELISA) .Results:The detection rates of serum IgG to Aa serotype c in the AgP patients and the healthy controls were both 100%.The AgP patients exhibited significantly higher IgG titers to Aa serotype c than the healthy controls (11.1 ±1.9 vs.9.1 ±1.8, P<0.01).There was no significant difference in serum IgG levels to Aa serotype c and in the prevalence of high-responding patients to Aa serotype c between the incisor-first molar type AgP patients and generalized AgP patients .Serum IgG titers to Aa serotype c in the Aa-positive AgP patients ( the patients who were Aa-positive in subgingival plaque or saliva ) were sig-nificantly higher than those of the Aa-negative patients (11.9 ±1.3 vs.10.7 ±2.1, P<0.05).Con-clusion:Serotype c was the main serotype of Aa in Chinese patients with AgP .Serum IgG responses in generalized AgP patients were comparable to those in incisor-first molar type AgP patients .