Is microbial infection always harmful? / 中华实验眼科杂志

It is possible for microbial infection (including parasitic infection) to disrupt the balance of autoimmune tolerance,result in the dysfunction of immune system,and make the organism encountered with the attack of the autoimmune disease.As one of the common places between foreign antigens and autoantigens,molecular mimicry is believed to play a vital role in the pathogenesis of autoimmune diseases.However,a large number of studies suggest that rather than inducing various symptoms of autoimmune diseases,many infection of microorganisms covered with mimic peptide of the autoantigen may even protect the infected organism from the disease at the level of antibodies or T cells when the analogous antigen invaded again.The present paper reviews the possible prognosis after microbial infection based on molecular mimicry.

Heat shock protein 110 improves the immunological effect of an altered peptide ligand of human papilloma virus type 16 E711-20 peptide / 中华皮肤科杂志

ObjectiveTo investigate the adjuvant effect of heatshock protein 110(HSP110) on the immune responses induced by an altered peptide ligand of human papilloma virus type 16 E711-20 peptide (HPV16E711-20).Methods The complex of HSP110 and an altered peptide ligand of HPV16E711-20 was constructed in vitro.Fifteen 6-week-old C57BL/6 female mice were randonly and equally divided into 3 groups,including complex group,ligand group,and phosphate buffered solution (PBS) group,to receive intraperitoneal immunization with the complex (100 μg),peptide (10 μg),and PBS (100 μl) respectively.Immunization was carried out with an interval of 2 weeks for 2 times.Two weeks after the last immunization,the mice were sacrificed followed by the isolation of splenocytes.MTT assay was performed to evaluate the proliferation activity of splenocytes,intracellular staining for interferon(INF)-γ to detect cytotoxic T lymphocytes (CTLs),standard chromium-51 (51Cr) release assay to estimate the lethal effect of specific CTLs on target cells.Statistical analysis was performed by using t test with SPSS 10.0 software.Differences were considered as statistically significant when the P value was less than 0.05.ResultsA significant increase was observed in the proliferation index ( 1.87 ± 0.122 vs.0.32 ± 0.071,t =4.01,P ＜ 0.01 ) of,and percentage of CD8+IFN-γ+ T lymphocytes(3.9％ vs.0.4％,t =3.88,P ＜ 0.01 ) among splenocytes from the complex group compared with the ligand group.At the effector-to-target ratio of 100 ∶ 1,50 ∶ 1,25∶ 1 and 12.5 ∶ 1,the death rate of target cells was 54.7％,72.2％,61.5％ and 39.8％ respectively after incubation with CTLs from the compleximmunized mice,higher than that from the ligand-immunized mice (35.2％,49.3％,28.1％,17.4％,respectively).ConclusionHSP110 could enhance the immunological effect of the altered peptide ligand of HPV16E711-20,and can serve as an immunological adjuvant.

Modification and identification of tyrosinase related protein-2(180-188) epitope / 第三军医大学学报

Objective To modify HLA-A2.1 restricted epitope of tyrosinase related protein-2 (TRP-2) (180-188) of human melanoma differentiation antigen and enhance HLA-A2.1 molecule its affinity to. Methods The TRP-2 (180-188) nave epitope was altered with the predominant amino acid for the primary anchor residues and auxiliary anchor residues. Altered peptide ligands (APLs) were scanned by polynomial method, the quantitative motif method and OSAR methods. The analogues their affinity to HLA-A2.1 molecule were assayed. Results Compared with the nave peptide, APLs had stronger affinity to HLA-A2 molecules. Conclusion Our results suggest that altered nave epitope with P1 (Y) and/or P2(L, M) can enhance affinity to HLA-A2 molecule. However, the immunogical efficacy of APLs needs to be identified in studies in vitro and in vivo.