上皮间质转化在大鼠舌黏膜创口愈合中的作用

Effects of epithelial-mesenchymal transition on the wound healing of lingual mucous membrane in rats

目的：越来越多的研究阐明EMT与癌症转移，组织器官纤维化及皮肤创伤愈合的情况关系密切，但在口腔黏膜创伤愈合方面的作用却依然需要进一步探索。文中通过对大鼠舌背部黏膜创口愈合过程的观察探讨上皮间质转化（ epithe-lial-to-mesenchymal transition ， EMT）在大鼠舌黏膜创口愈合过程中的作用及其意义。方法取8周龄Wistar 大鼠，于舌背部黏膜处作一直径为3 mm的圆形缺损模型，分别于术后0、1、2、3、4、8 d处死，HE染色观察组织愈合过程，同时采用免疫组织荧光法检测 EMT相关蛋白E-钙黏蛋白（E-cadherin， E-cad），波形蛋白（Vimentin）和成纤维细胞特异性蛋白-1（fibroblast specif-ic proteins， FSP1）在舌黏膜创口愈合过程中的表达。结果大鼠舌黏膜创口边缘E-cad表达术后2～4 d较0、1d减少，间质细胞特异蛋白Vimentin、FSP1在上皮基底层表达。术后8 d舌黏膜创口完全愈合，E-cad表达量与0 d相近，上皮基地层仍可见少量Vimentin、FSP1表达。结论 E-cad、Vimentin、FSP1参与舌黏膜创口愈合过程，部分上皮细胞向创口中心迁徙过程中具备了间质细胞特性。

[Abstract ] Objective More and more researches demonstrate that epithelial-mesenchymal transition（EMT） is highly rele-vant to cancer metastasis , tissue fibrosis and skin wound healing , but its role in the wound healing of oral mucosa still needs further ex-ploration.This study was designed to discuss the effects of EMT on the wound healing of lingual mucous membrane in rats . Methods A 3mm-diameter circular defect was made on the mucosa of lingual dorsum in 8-week-old Wistar rats.The rats were put to death at day 0, 1, 2, 3, 4 and 8 after operation.We observed tissue healing process by HE staining and used immunohistochemical fluorescence to detect the expressions of EMT-related protein E-cadherin（E-cad）, Vimentin and Fibroblast specific proteins （FSP1） in lingual mucous membrane during wound healing . Results The expressions of E-cad at the edge of the wound in the lingual mucous membrane of rats at day 2 and 4 after operation were less than those at day 0 and 1 after operation , while interstitial cell specific protein Vimentin and FSP1 were positively expressed in the epidermal basal layer .The wound of lingual mucous membrane healed completely at day 8 after operation , and E-cad expression was close to that at day 0 after operation .A small amount of Vimentin and FSP 1 expressed in the epi-thelial basal layer . Conclusion E-cad, Vimentin, FSP1 are involved in the wound healing process of lingual mucous membrane . During the wound healing in the tongue mucous membrane of rats , some epithelial cells gain the feature of mesenchymal cells in the process of migration to wound centre .EMT has played an important role during wound healing of lingual mucous membrane in rats .