Objective:To investigate the expression of LAIR-1 on Treg cells and TGF-βin the peripheral blood of patients with oral lichen planus(OLP).Methods:The peripheral blood was obtained from 22 OLP patients and 22 healthy controls.Flow cytometry was used to evaluate the proportion of LAIR-1 on CD4 +Foxp3 +Treg cells,and the level of TGF-βwas measured by ELISA.Results:In the peripheral blood of OLP patients,the proportion of LAIR-1 on CD4 +Foxp3 +Treg cells and TGF-βcontent were significantly higher than those of the healthy controls(P <0.05),The proportion of LAIR-1 on CD4 +Foxp3 +Treg cells was positively correlated with the level of TGF-β(r =0.43,P <0.05).Conclusion:The high expression of LAIR-1 on CD4 +Foxp3 +Treg cells and TGF-βin the pe-ripheral blood of OLP patients may be responsible for the pathogenesis of OLP.%目的：研究 LAIR-1和 TGF-β在口腔扁平苔藓（OLP）患者外周血中的表达情况，探讨 LAIR-1和 TGF-β对 OLP 患者免疫功能的影响。方法：采用流式细胞术检测 LAIR-1在 OLP 患者（n ＝22）和健康人（n ＝22）外周血 Treg 上的表达水平， ELISA 检测外周血 TGF-β的水平。结果：OLP 患者外周血 CD4＋Foxp3＋Treg 上 LAIR-1阳性率高于健康人，TGF-β的水平亦高于健康人，LAIR-1在 CD4＋Foxp3＋Treg 上的表达水平和 TGF-β的水平呈正相关（r ＝0．43，P ＜0．05）。结论：LAIR-1和TGF-β在 OLP 患者外周血中表达上调，提示 LAIR-1和 TGF-β可能参与了 OLP 的发病。
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