白细胞介素1β和白细胞介素17在根尖周病组织肥大细胞上的表达

 目的：观察不同类型慢性根尖周病组织中肥大细胞（mast cells, MCs）的分布情况,并分析白细胞介素1β（interleukin-1β,IL-1β）和白细胞介素17（interleukin-17,IL-17）在MCs上的表达情况,探讨MCs IL-1β和IL-17在根尖周病发病机制中的作用。方法：本实验共收集102例样本,分为3组：（1）根尖肉芽肿组32例;（2）根尖囊肿组35例;（3）正常对照组35例。组织标本经4%中性甲醛缓冲液固定48 h以上;石蜡包埋,组织连续切片,HE染色,在光学显微镜下观察其组织学改变;采用免疫荧光双染色法,在荧光显微镜下观察各组标本组织表达IL-1β和IL-17的MCs数目。结果：两组慢性根尖周病的炎症反应程度明显高于正常对照组（P<0.01）;根尖囊肿组与根尖肉芽肿组之间炎症反应程度无显著差异（P>0.05）。与正常对照组相比,两组慢性根尖周病组织中IL-1β和IL-17阳性MCs数目均显著增多（P<0.01）;根尖囊肿组与根尖肉芽肿组IL-1β和IL-17阳性MCs密度无显著性差异（P>0.05）。经Pearson相关分析,3组标本组织中IL-1β和IL-17阳性MCs密度与组织炎症反应程度存在直线的正相关关系（P<0.01）。结论：慢性根尖周病组织中MCs数目明显增多,同时IL-1β和IL-17阳性的MCs密度显著增高。IL-1β和IL-17阳性MCs密度与根尖周病的炎症程度趋势相一致。这提示IL-1β和IL-17阳性MCs可能在慢性根尖周病的致病机制中发挥重要作用。

Expression of IL-1β and IL-17 on mast cells in human periapical diseases

AIM：To identify and quantify the expression of IL-1β and IL-17 in mast cells (MCs) in different types of human pericapical diseases using double immunofluorescence staining. METHODS：The specimens (n=102), including healthy control (n=35), periapical cyst (n=35) and periapical granuloma (n=32), were involved in the present study. The tissue samples were fixed in 10 % buffered formalin for at least 48 h and then embedded in paraffin. Serial 5-μm-thick sections were deposited onto SuperFrost/Plus microscope glasses. Routine staining of the sections using hematoxylin & eosin (HE) was performed for morphological evaluation. The number of IL-1β and IL-17 positive MCs was identified by double immunofluorescence staining. RESULTS：Compared with the healthy controls, the inflammation score of periapical lesions was significantly increased in the periapical patients (P<0.01). The density of IL-1β and IL-17 positive MCs in the periapical lesions were obviously higher than that in the healthy controls (P<0.01). However, no significant difference between periapical cyst and periapical granuloma was observed. The Pearson correlation analysis showed that there was a positive correlation between the density of IL-1β and IL-17 double positive MCs and inflammation score in different groups of specimens (P<0.01). CONCLUSION：There is significantly increased number of MCs, along with increased density of IL-1β and IL-17 positive MCs in human periapical lesions. The increased density of IL-1β and IL-17 positive MCs has the similar tendency as the severity of tissue inflammation in human periapical lesions, suggesting that IL-1β and IL-17 positive MCs may play an important role in the pathogenesis of human periapical diseases.