口腔扁平苔藓患者外周血单个核细胞中 PD-1和 PD-L1的表达及意义

目的：了解口腔扁平苔藓（OLP）患者外周血单个核细胞（PBMCs）中 PD-1 mRNA、PD-L1 mRNA 的表达及意义。方法：分别采用流式细胞术和散射比浊法分析36例 OLP 患者外周血淋巴细胞亚群（CD3＋、CD4＋、CD8＋、CD19＋、CD16＋＋56＋）状况和检测患者体液免疫指标（lgG、lgA、lgM、C3、C4）。采用荧光定量 PCR 法（qPCR）检测36例 OLP 患者及18例健康对照组 PB-MCs 中 PD-1 mRNA、PD-L1 mRNA 的表达情况并分析其与 OLP 患者免疫功能状况的相关性。结果：OLP 患者外周血中 CD3＋、CD4＋、CD8＋、CD16＋＋56＋（NK）均低于正常值（P ＜0．05），CD19＋（B）高于正常值（P ＜0．05）；血清补体 C3、C4较正常值降低（P ＜0．05），免疫球蛋白 lgM较正常值增高（P ＜0．05）。OLP 患者 PBMCs 中 PD-1 mRNA 及 PD-L1 mRNA 的相对表达量均高于对照组（P ＜0．05），且 PD-1 mRNA 与 PD-L1 mRNA 的相对表达量呈正相关。PD-1 mRNA 的相对表达量与 OLP 患者 CD4＋呈负相关，与 lgG 呈正相关；PD-L1 mRNA 的相对表达量与 CD19＋呈正相关。结论：OLP 患者 PBMCs 中 PD-1、PD-L1 mRNA 的表达上调与 OLP 患者免疫功能状况相关，提示 PD-1／PD-L1通路可能参与 OLP 的免疫发病机制。

The expression and significance of PD-1 and PD-L1 in peripheral blood mononuclear cells of OLP patients

Objective:To explore the expression of PD-1 mRNA and PD-L1 mRNA in peripheral blood mononuclear cells(PBMCs)of OLP patients.Methods:The peripheral blood lymphocyte subsets (CD3 +,CD4 +,CD8 +,CD1 9 +,CD1 6 ++56 +)and humoral immunity indexes (lgG,lgA,lgM,C3,C4)were detected in 36 patients with OLP by flow cytometry and nephelometry respectively.The expres-sions of PD-1 mRNA and PD-L1 mRNA in PBMCs of 36 patients with OLP and 1 8 healthy individuals(the controls)were detected by fluorescence quantitative PCR,the correlation of PD-1 mRNA or PD-L1 mRNA with the immune function of OLP patients was analysed. Results:In OLP patients the percentages of peripheral blood lymphocyte subsets (CD3 +,CD4 +,CD8 +,CD1 9 +,CD1 6 + +56 +)as well as the complement of C3 and C4 were lower(P <0.05),the percentages of CD1 9 +(B)and the level of lgMwere higher(P <0.05),the expression levels of PD-1 mRNA and PD-L1 mRNA in rPBMCs were higher(P <0.05)than in the controls.There was positive correla-tion between PD-1 mRNA and PD-L1 mRNA expression level.The expression level of PD-1 mRNA was negatively correlated with CD4 +,but positively with lgG,the expression level of PD-L1 mRNA was positively correlated with CD1 9 +.Conclusion:The up-regu-lation of PD-1 mRNA and PD-L1 mRNA in PBMCs is correlated with the immunity of OLP patients.PD-1 /PD-L1 pathway may play an important role in immune pathogenesis of OLP.