ABSTRACT
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.