旋毛虫感染促进白细胞介素-4表达并抑制小鼠实验性牙周炎

Role of interleukin-4 in the development of periodontitis in mouse model

目的:通过对实验性牙周炎小鼠接种低剂量旋毛虫(T.spiralis)介导Ⅱ型辅助性T淋巴细胞(Th2)反应,探讨白细胞介素-4(IL-4)在牙周炎进程中的作用。方法:清洁级12周龄雄性昆明小鼠27只,随机分为3组:(1)正常对照组;(2)实验性牙周炎组:参照Kimura等的方法复制实验性牙周炎模型;(3)旋毛虫感染合并牙周炎组(periodontitis+T.spiralis-infected group,P+T.spiralis):复制小鼠牙周炎模型,同时给予低剂量旋毛虫感染。正常对照组及各实验组小鼠分别于术后第1、3和5周末分批处死,各时点每组处死小鼠数为3只。处死小鼠前测量牙周探诊深度,制作牙体牙周联合切片观察牙周的组织学改变,并采用ELISA法检测牙周炎小鼠外周血IL-4的水平。结果:(1)P+T.spiralis组IL-4的含量明显高于实验性牙周炎组(P<0.01);(2)各时点P+T.spiralis组牙周探诊深度明显低于实验性牙周炎组(P<0.01);(3)P+T.spiralis组牙周组织的炎症及破坏程度明显减轻。结论:旋毛虫感染可升高小鼠血清IL-4水平,抑制牙周炎的发生,提示在牙周炎治疗中提高血清IL-4水平可能具有治疗价值。

AIM： The purpose of this study was to investigate the role of interleukin-4 （IL-4） in the development of periodontitis in mice by low dosage of Trichinella spiralis （T. spiralis） infection.METHODS： Twenty-seven male Kunming mice in specific pathogen free grade were randomly divided into three groups： （1） the normal control group; （2） the experimental periodontitis group, which was produced by ligature of braided silk around the first maxillary molar, and was inoculated with putative periodontopathic bacteria; （3） the periodontitis with T. spiralis infection group. The mice were sacrificed at the end of 1, 3 and 5 weeks. The probing depth （PD） was measured before the mice were euthanized. The histological change of periodontal tissues was observed under the microscope after the samples were stained with hematoxylin and eosin. Furthermore, the serum level of IL-4 was determined by ELISA. RESULTS： （1） The serum level of IL-4 in T. spiralis-infected group was significantly higher than that in experimental periodontitis group （P〈0.01）. （2） The PD in T. spiralis-infected group was significantly lower than that in experimental periodontitis group （P〈0.01）. （3） Only a mild inflammatory response was observed in T. spiralis-infected animals. CONCLUSION： T. spiralis infection upregulates IL-4 expression and attenuates periodontitis in mice.