华西口腔医学杂志

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过量氟对大鼠切牙基质金属蛋白酶-20及其组织抑制剂表达的影响

井枫秋,王  强,刘天麟,郭丽英,刘  辉   

  1. 同济大学附属口腔医院  口腔内科,上海 200072
  • 收稿日期:2006-06-25 修回日期:2006-06-25 出版日期:2006-06-20 发布日期:2006-06-20
  • 通讯作者: 王 强,Tel: 021-56032686-8122
  • 作者简介:井枫秋(1980-),女,新疆人,硕士研究生
  • 基金资助:

    同济大学十五·211工程建设资助项目(1504102011) 

Effects of Overdosed Fluoride on Rat′s Incisor Expression of Matrixmetalloproteinase-20 and Tissue Inhibitors of Metalloproteinase-2

JING Feng-qiu, WANG Qiang, LIU Tian-lin, GUO Li-ying, LIU Hui   

  1. Dept. of Oral Medicine,Hospital of Stomatology, Tongji University, Shanghai 200072, China
  • Received:2006-06-25 Revised:2006-06-25 Online:2006-06-20 Published:2006-06-20

摘要:

目的  研究过量氟对大鼠切牙生长过程中基质金属蛋白酶-20(MMP-20)和基质金属蛋白酶组织抑制剂-2(TIMP-2)表达的影响,探讨氟斑牙的发病机制。方法  选择20只Wistar大鼠,随机分为对照组和给氟组。8 周后处死动物,获取切牙标本,免疫组化染色观察MMP-20和TIMP-2在大鼠切牙中的表达定位和氟对二者表达的影响。结果  MMP-20和TIMP-2 在分泌期成釉细胞、成牙本质细胞以及成釉器均有阳性表达,给氟组MMP-20的表达明显弱于对照组,差异有统计学意义(P<0.01);TIMP-2在两组的表达无显著性差异(P>0.05)。结论  过量氟可抑制MMP-20的表达, MMP-20和TIMP-2表达失衡,TIMP-2的抑制作用加强,致使釉基质蛋白清除延迟,导致矿化不全和釉质缺损。

关键词: 氟, 大鼠切牙, 基质金属蛋白酶, 基质金属蛋白酶组织抑制剂

Abstract:

Dept. of Oral Medicine,Hospital of Stomatology, Tongji University, Shanghai 200072, China)[Abstract]  Objective  To investigate the effects of overdosed fluoride on the expression of MMP-20 and TIMP-2 in rat incisor. Methods  20 Wistar rats were randomly divided into experiment group and control group. The distilled water was given in control group. 100 mg/L fluoride- was given in experiment group. After 8 weeks treatment, the rats were killed. Immunohistochemical staining was used to observe the expression of MMP-20 and TIMP-2 in rat incisors. Results  Immunohistochemical results demonstrated the presence of MMP-20 and TIMP-2 protein in ameloblasts, odontoblasts, stratum intermedium and the stellate reticulum of rat incisor. The imagination analysis results showed that the expression of MMP-20 was reduesed in experiment group(P<0.01), and the expression of TIMP-2 had no significant difference(P>0.05). Conclusion  The overdosed fluoride inhibits the secretion of MMP-20 and leads to the disturbed balance between MMP-20, TIMP-2 in rat incisor, which leads to the delay of the amelogenin removal and the enamel demineralization.

Key words:  fluoride, rat incisor, matrix metalloproteinase-20, tissue inhibitors of metalloproteinase-2