Correlation between plasma levels of sPD-1 and sPD-L1 with hepatic inflammation in chronic HBV infected patients
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Abstract
Objective: The immunosuppressive PD-1/PD-L1 (programmed cell death-1/ programmed cell death ligand-1) signaling pathway is considered to play an important role in the pathogenesis of HBV infection. We conducted a prospective cohort study to assess the relationship between circulating sPD-1 and sPD-L1 (soluble forms) levels in HBV infection and live disease outcome and progression. Subject and method: Plasma sPD-1 and sPD-L1 levels were quantified using commercial ELISA kits in a prospective cohort including asymptomatic carrier (ASY, n = 30), chronic hepatitis (CHB, n = 79), hepatocellular carcinoma (HCC, n = 47) and 73 healthy individuals as control group (HC). Result: The plasma sPD-1 and sPD-L1 levels were significantly higher in HBV infected patients or in each patient groups (ASY, CHB, HCC) compared to the controls (p<0.0001). Among HBV-infected patients, plasma sPD-1 and sPD-L1 levels were higher in the CHB followed by the HCC and ASY group. The plasma levels of sPD-1 and sPD-L1 were positively correlated with hepatic inflammation markers such as AST, ALT and GGT in HBV- infected patients. Conclusion: We could show that HBV infection can induce the expression of PD-1 and PD-L1 and significantly increased levels of plasma sPD-1 and sPD-L1 are correlated with the hepatic inflammation in chronic HBV-infected patients.
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