Research progress of Helicobacter pylori vaccine / 细胞与分子免疫学杂志

Helicobacter pylori (Hp) is one of most common pathogens causing gastrointestinal disorder including gastric ulcer, duodenal ulcer and gastric cancer, etc. It has been verified as class I carcinogen by WHO. Nowadays, combination antibiotics and proton pump inhibitor are mainly used to erase Hp in clinical application. However, with the increased resistance of Hp, the vaccine against Hp might become the best strategy to eradicate Hp. Elements including urease, virulence factor, outer membrane protein, flagella, play an important role in Hp infection, colonization and reproduction. They have become potential candidate antigens in the development of Hp vaccine, as reported in previous studies. Presently, these antigens-centric vaccines have been tested in animal models. Therefore, this article reviews the studies on Hp vaccine with urease, virulence genes, outer membrane protein and flagella as their candidate antigens, in an attempt to provide insights for research in this regard.

Clearance effect of milk containing anti-Helicobacter pylori specific antibody:a randomized clinical trial / 中国免疫学杂志

Objective:To compare and observe the different clearance effect of milk containing anti-Helicobacter pylori specific antibody. Methods:Four H. pylori strains were used to immune dairy cows to obtain milk containing anti-Helicobacter pylori specific antibody,of which,one was standardized strain and the other three were locally epidemic. Totally 148 people were screended,in which 72 were C-14 urea breath test positive, finally 39 meet the criteria. They were divided into two groups, the test group contained 21 subjects,were treated milk containing anti-Helicobacter pylori specific antibody;the 18 subjects in control group with common milk. The study was continued for 2 months. Results:Conducting the C-14 urea breath test,9 subjects in test group were negative,but no one was changed in control group. The effective clearance rate of the test group was 42. 86%,and there was no effective clearance in the control group,so there was significant difference in the two groups(P=0. 005,P<0. 05). Conclusion: The milk containing anti-Helicobacter pylori specific antibody is polyclonal and has higher valence,and could clear H . Pylori effectively.

MiR-200c/141 methylation inhibits the expression of miR-200c and miR-141 in gastric cancer / 中国肿瘤临床

Objective:This work aims to detect the levels of miR-200c/141 methylation and miR-200c/141 in gastric cancer tissue and investigate the relationship between miR-200c/141 expression and clinical parameters. Methods:The methylation status of miR-200c/141 CpG island and miR-200c/141 in gastric cancer tissue specimens was evaluated by qRT-PCR or BS-MSP method. We analyzed the relationship among the methylation status of miR-200c/141 CpG island, expression level of miR-200c or miR-141, and clinical parame-ters. Results:The status of miR-200c/141 CpG island methylation in gastric cancer tissue was significantly higher compared with that in paracarcinoma tissue. MiR-200c and miR-141 were markedly decreased in gastric cancer tissue compared with those in adjacent tis-sue. MiR-200c/141 CpG island methylation was negatively related with the expression of miR-200c and miR-141 in gastric cancer speci-mens. Conclusion:The upregulation of miR-200c/141 CpG methylation inhibits miR-200c/141 expression in gastric cancer tissue.

Expression and correlation of tumor-associated macrophages and CCL5 in ganstric cancer / 中国免疫学杂志

Objective:To study the expression and correlation of tumor-associated macrophages(TAM) and CCL5 in ganstric cancer.Methods:48 cases patients with completed clinical and pathological data of gastric cancer paraffin block specimens were select-ed.Cancer tissues and adjacent tissues were used as control,using SP immunohistochemical method to detect CD68 and CCL5 in gastric cancer tissues and adjacent tissues,and using the Spearman correlation statistics statistical methods for the correlation.Results:CD68 and CCL5 showed positive expression in gastric cancer tissue,significantly higher than those in the adjacent tissues(P<0.01),CD68 and CCL5 were related with gastric cancer invasion depth, lymph node metastasis, TNM stage and tumor differentiation ( P<0.001 ) . There was positive relation between the expression of CD68 and CCL5 in gastric cancer(P<0.01,r=0.759).Conclusion: CD68 and CCL5 played a driving role to the invasion and metastasis of gastric cancer occurrence,suggesting that the secretion CCL5 by TAM may promote the invasion and metastasis of gastric cancer.

Effects of 2-methoxyestradiol on the proliferation and apoptosis of B16 malignant melanoma cells / 中华皮肤科杂志

Objective To investigate the effects of 2-methoxyestradiol (2-ME) on the proliferation and apoptosis of a mouse malignant melanoma cell line B16,and to explore their mechanism.Methods B16 cells were cultured in vitro,and divided into a negative control group receiving no treatment and several intervention groups treated with 2-ME at final concentrations of 5,10,20,40 mmol/L,respectively.After different durations of treatment,inverted phase-contrast microscopy was conducted to observe the morphologic change of B16 cells,sulforhodamine B (SRB) assay to evaluate proliferative activity and to draw growth curve of B16 cells according to the absorbance value at 490 nm,flow cytometry to detect cell cycle and apoptosis,and reverse transcription PCR and real-time PCR were performed to measure the expressions of the apoptosis-inducing gene gadd45b and proto-oncogene c-myc.Results As repeated measures analysis of variance showed,there were significant differences in the inhibitory effect on B16 cell proliferation among different concentrations (5,10,20,40 mmol/L) and different treatment durations (24,48,72 hours) of 2-ME (F =1170.94,1843.04,respectively,both P ＜ 0.01),and there was a significant interaction effect between these concentrations and treatment durations (F =272.79,P ＜ 0.01).After 48-hour treatment with 2-ME at 10,20 and 40 mmol/L,the apoptosis rate of B16 cells was increased to (4.13 ± 1.12)％,(11.25 ± 2.380)％ and (19.46 ± 2.9)％ respectively,compared to (0.23 ± 0.5)％ in the negative control group (all P＜ 0.01); the proportion of B16 cells in G0/G1 phase was increased to (59.5 ± 5.6)％,(63.4 ± 8.2)％ and (70.8 ± 4.4)％ respectively,compared to (44.1 ± 3.4)％ in the negative control group.There was a significant difference in the proportion of B16 cells in G0/G1 phase among the negative control group and intervention groups (F =13.56,P ＜ 0.05).Moreover,the mRNA expression of gadd45b was significantly enhanced after 24-hour treatment with 2-ME at concentrations of 20 and 40 mmol/L (both P＜ 0.01),while that of c-myc was significantly weakened after treatment with 2-ME at 10,20 and 40 mmol/L (all ＜ 0.05) compared with the negative control group.Conclusion 2-ME can inhibit the proliferation of B16 cells in vitro,upregulate the expression of gadd45b gene and downregulate the expression of C-myc gene.

Effects of FSEER on immunosuppressive and bone-marrow-suppressive mice after chemotherapy / 中国免疫学杂志

Objective:To observe the effect of FSEER on the immunosuppressive and bone-marrow-suppressive mice after chemotherapy,and explore the mechanism of hematopoietic and immunologic function in mice accentuated by FSEER.Methods: Mice were injected cyclophosphamide(Cy)except control group,then randomly divided into mode group(saline),FSEER groups[120,60 mg/( kg· d) ].The spleen index( SI) of all mice was calculated respectively.Flow cytometry instrument testing mice peripheral blood lymphocytes CD3,CD4,CD8 change.The content of TNF-α,IL-2 and IL-12 in mice serum were measured by ELISA kits.Morphological images of bone marrow of the mice were observed under the microscope after Wright-Giemsa′s staining.Results:The spleen index( SI) was increased in both of the two FSEER groups.ELISA analyses showed that the content of TNF-αand IL-2 was increased in both of the two FSEER groups.The population of CD3+CD4+T lymphocyte and the ratio of CD4+/CD8+were all increased in the low dose experimental group.After treated with FSEER, the hematopoietic depression was improved significantly.Conclusion: FSEER can improve the state of immunosuppressive and myelosuppressive mice caused by Cy thus could alleviate the side effect of chemotherapy ef-fectively.

Inhibitory effect of cochinchina momordica seed ethanol extract on proliferation of melanoma B16 cells and its possible meachanism / 中国肿瘤生物治疗杂志

Objective: To investigate the effect of cochinchina momordica seed ethanol extract (CMSEE) on the proliferation of melanoma B16 cells and the underlying mechanism. Methods: MTT and clone formation assay were used to assess the effect of CMSEE on the growth of B16 cells. Morphological changes of B16 cells were observed under phase-contrast microscope and Giemsa staining. Cell cycle and apoptosis rate were examined by flow cytometry (FCM). The effect of CMSEE on melanin production and tyrosinase activity of B16 cells was assessed by colorimetry. The effect of CMSEE on the expression of C-myc, P38, and Tyr genes was examined by RT-PCR. Results: CMSEE (10-100 mg/L) inhibited the proliferation of B16 cell in a dose-and time-dependent manner. After treatment with 10-40 mg/L CMSEE, B16 cells showed typical differentiation morphology, and melanin production and tyrosinase activity were increased. B16 cells treated with 100 mg/L CMSEE showed apoptotic morphology, decreased melanin production and tyrosinase activity. B16 cell number in G_0/G_1 phase was significantly increased (P<0.01); C-myc mRNA expression was down-regulated, and P38, Try mRNA expression was up-regulated in B16 cells after treatment with 10-40 mg/L CMSEE. Conclusion: CMSEE can markedly inhibit the proliferation of melanoma B16 cells, which is related to induction of differentiation and promotion of apoptosis of B16 cells.

Immunoenhancement effect of ICA on the mouse model of Cy-induced hypoimmunity / 中国免疫学杂志

Objective:Effect of ICA (Icariin) was observed on immunosuppression mice caused by Cyclophosphamide(Cy).Methods:A total of 60 mice,expect control group mice,were injected Cy intraperitoneally [300 mg/(kg·d)],then randomly divided into modelgroup(saline),positive (shenqi,1 ml/d)groups,ICA groups[150,80,40 mg/(kg·d)].Saline,shenqi and ICA were perfused respectively for 10 successive days;All mice were sacrificed after 12 h of last administration for performing following experiments.Measuring SI and TI and calculating amounts of lymphocyte from spleen and peripheral blood;Proliferative reaction of splenic lymphocyte stimulated by ConA and LPS were detected by MTT assays.Killing activity of NK and CTL cells for colon26 and level of TNF-α production were measured by LDH method.Ratios of CD3~+ T and NKT in splenic lymphocyte (SPL) were studied by FACS.Results:ICA can recovery TI and SI of mice to normal level and boost the population of splenic lymphocyte (SPL) (P<0.01).After treatment with ICA,activities of NK cell and CTL cell were significantly improved,and the level of TNF-α was significantly elevated.The ratios of NKT and CD3+T in the ICA-treated group were increased obviously (P<0.01).Conclusion:ICA can enhance immunological function and alleviate the side effect of chemotherapy effectively.

Interleukin-27 inhibits tumor angiogenesis through up-regulating expression of MIG and IP-10 / 中国肿瘤生物治疗杂志

Objective:To study the inhibitory effect of IL-27 against human tumor angiogenesis and the related mechanisms.Methods: Human esophageal carcinoma cells(Eca109/IL-27) stably transfected with IL-27 gene were injected into nude mice to establish tumor-bearing mouse model.The survival time and tumor growth were observed.IFN-? level secreted by splenocytes was measured by ELISA.Expression of VEGF and CD34 was detected by immunohistochemistry method and MVD was calculated according to CD34 level.RT-PCR was used to detect the expression of IP-10 and MIG mRNA in the tumor tissues.Results: The survival time of mice injected with Eca109/IL-27 cells was significantly longer than those of mice injected with wide type Eca109 or Eca109/LXSN(blank vector) cells(P