LAG-3抑制性共刺激分子和慢性HBV感染關(guān)系的研究
[Abstract]:Background and purpose
Lymphocyte activation gene-3 (LAG-3) is an independent negative immunoregulatory molecule, which can maintain the stability of the internal environment and participate in immune regulation. It is closely related to the depletion of CD8 + T cells caused by chronic virus infection. Continued infection is associated with low specific CD8 + T lymphocyte responsiveness. This article mainly discusses the relationship between LAG-3 and the progression of chronic hepatitis B, and provides new ideas for seeking new antiviral treatment strategies.
Objects and methods
1 object of study
Ninety outpatients and inpatients with HBV infection from February 2012 to June 2013 in the Department of Infections of the First Affiliated Hospital of Zhejiang University were selected and divided into three groups: chronic hepatitis B patients group, chronic asymptomatic HBV carriers group and normal control group.
2 experimental method
1) Peripheral blood mononuclear cells (PBMC) were isolated from fasting veins to collect whole blood samples, and then separated from PBMC by Ficoll lymphocyte isolation solution.
2) CD8+T lymphocyte CD223 was measured by flow cytometry to detect the expression of CD223 (LAG-3) in CD8+T lymphocytes.
3) Intracellular IFN-gamma was measured by flow cytometry. The secretion of cytokine IFN-gamma in CD8+T cells expressing or not expressing LAG-3 was determined by membrane breaking and staining.
4) the effect of LAG-3 antibody blocking on the secretion of IFN- gamma by lymphocytes (ELISPOT method).
5) HBsAg, anti-HBs, anti-HBeAg, anti-HBe and anti-HBc were detected by chemiluminescent microparticle immunoassay (CMIA), and HBV-DNA was detected by fluorescence quantitative polymerase chain reaction (PCR) with a cut-off value of 103 copies/m1.
6) serum alanine aminotransferase (ALT) was determined by HITACHI7600-110 automatic biochemical analyzer.
7) Data were analyzed by SPSS 13.0 and GraphPad Prism5.
Result
1) The frequency of CD8 + CD223 + distribution on lymphocyte surface in patients with chronic hepatitis B was significantly higher than that in normal control group and chronic HBV carrier group (P 0.01).
2) The frequency of CD8+CD223+ distribution on lymphocyte surface in patients with chronic hepatitis B was significantly higher than that in normal control group (P 0.05) in patients with ALT high DNA and ALT high DNA. However, the frequency of CD8+CD223+ distribution on lymphocyte surface in patients with chronic hepatitis B was significantly higher than that in normal control group (P 0.05).
3) The frequency of CD8 + CD223 distribution on the surface of chronic hepatitis B patients and chronic HBV carriers was positively correlated with the corresponding ALT level (P = 0.03, r = 0.23).
4) In PBMC of patients with chronic hepatitis B, the frequency of IFN-gamma distribution in CD8+CD223-cells was significantly higher than that in CD8+CD223+ cells (P=0.02).
5) The number of dot forming cells of PBMC in patients with chronic hepatitis B was significantly higher than that in patients with hepatitis B core antigen and CD223 antibody stimulation group (P 0.01), hepatitis B core antigen plus homotype IgG group (P 0.01) and hepatitis B core antigen plus PD-L1 group (P = 0.01); PBMC in patients with chronic hepatitis B was dot-shaped in patients with hepatitis B core antigen plus PD-L1 and CD223 antibody. The number of adult cells was significantly higher than that of hepatitis B core antigen plus PD-L1 group (P=0.03), but there was no significant difference between hepatitis B core antigen plus CD223 antibody group (P 0.05).
conclusion
1) The expression of LAG-3 on peripheral blood CD8 + T cells in patients with chronic hepatitis B was significantly increased, and was positively correlated with the degree of hepatitis, but not with HBV DNA load.
2) In patients with chronic hepatitis B, the function of CD8 + T cells with high LAG-3 expression is impaired, and the level of IFN-gamma secreted by CD8 + T cells is decreased.
3) The function of CD8+T cells in peripheral blood of patients with chronic hepatitis B could be restored by adding LAG-3 antibody, and the function of CD8+T cells could be restored by LAG-3 antibody combined with PD-L1 blockade.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:R512.62
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