RESUMO
Objective @#To evaluate the immune effects of inactivated H7N9 influenza vaccine.@*Methods @#We searched several common databases（The Cochrane Library,PubMed,China Biology Medicine disc,China National Knowledge Infrastructure,etc.）for research articles about immune effects of H7N9 influenza vaccine published from the time the database built to July 10th of 2018,using H7N9 and vaccine as keywords. After screening the articles according to the inclusion and exclusion criteria,we assessed the quality of the studies and then employed seroconversion rate（SCR）as an outcome indicator to analyze the immune effects of different doses and adjuvants.@*Results @#We recruited 5 articles on inactivated H7N9 influenza vaccine from 1 679 articles. The sample size was 2 579. The results of the meta-analysis showed that the rate difference（RD）values of SCR in each dose group after the first dose ranged from 1% to 10%,which indicated a poor protective effect;after the second dose of immunization,the RD values of SCR in the vaccines without adjuvants ranged from 13% to 19%,which was not effective enough;the RD values of SCR in the vaccines with adjuvants ranged from 62% to 69%,which met the licensing criteria for influenza vaccine;better results could be achieved when immunized with two doses of vaccines with adjuvants（ RR=1.19,95%CI：1.02-1.39）;vaccines with AS03 or MF59 at the lowest dose of 3.75 μg had the same immune effects as ones at a dose of 15 μg;vaccines with AS03（RD=89%,95%CI：85%-93%）were superior to those with MF59（RD=42%,95%CI：9%- 75%）.@*Conclusion @#Inactivated H7N9 influenza vaccines could achieve good immune effects when inoculated two doses with adjuvants,and the minimum effective dose was 3.75 μg.
RESUMO
Objective To investigate the stimulation of exosome derived from osteosarcoma cells suppressing cytotoxic T cells and the inhibitory effect of active T cells for surpressing osteosarcoma cells. Methods Exosome derived from tumor cells was isolated and purified by ultracentrifugation. Its morphology was observed with transmission electron microscope, and the major histocompatibility complex-I ( MHC-I) molecules were analyzed by western blot. Mice bone marrow-derived dendritic cells were pulsed with exosome. Surface membrane MHC-I molecules were analyzed with flow cytometry. The effect of active T cells on the growth of osteosarcoma cells were detected by MTT assay after the T cells being stimulated by exosome-pulsed dendritic cells. Results The exosome was round or near round corpuscle, and the diameter was about 50-100 nm by transmission electron microscope. The size was relatively homogeneous. Western blot showed that the exosome expressed MHC-Ⅰmolecules. Surface membrane CD80,MHC-I and II molecules were expressed on 77. 16%, 83. 21%, and 91. 26% of LPS-treated dendritic cells, respectively, which were up-regulated compared to untreated cells. Dendritic cells pulsed with exosome derived from osteosarcoma cells caused significantly higher T cells stimulation and osteosarcoma cells inhibition as compared to un-pulsed dendritic cells. (P<0.05). Conclusion T cells can inhibit the growth of osteosarcoma cells after being stimulated by exosome-pulsed dendritic cells in vitro.
RESUMO
Background and purpose:Studies have shown that ribosomal protein L8 (RPL8) is shared by melanomas, gliomas and ovarian carcinomas. A peptide of RPL8 signiifcantly stimulated proliferation and cytokine expression of the hepler T cell clone and lymphocytes in melanoma patients. RPL8 may stimulate anti-tumor immunity, making RPL8 an attractive candidate for therapeutic intervention. In this study, we prepared DC pulsed by RPL8 (RPL8-DC) and investigate the anti-tumor effect of RPL8-DC on melanoma in mice.Methods: The recombinant protein was achieved through IPTG induction in E. coli and identiifed with Western blot. Bone marrow-derived DC was loaded with RPL8 protein. RPL8 and CD11c, CD80, MHC-Ⅰ, MHC-Ⅱmolecules on dentritic cells were monitored by lfuorescence microscope and FACS analysis, respectively. The anti-tumor effect of T cells in vitro was detected by MTT assay. Subcutaneous tumors were induced in C57BL/6 mice using B16 cells. The tumor volumes were measured after injection with RPL8-DC. Results:The puriifed protein was combined with speciifc antibodies. DCs pulsed by RPL8 were visualized under lfuorescent microscopy. CD11c, CD80, MHC-Ⅰ, MHC-Ⅱmolecules on DCs were up-regulated after stimulation with RPL8 and LPS. B16 cells were inhibited by T cells stimulated with RPL8-DC. The inhibition rate of tumor cells was 70%in RPL8-DC group when effector-to-target ratio was 30∶1, which was higher than PBS and DC groups. Inhibition of growth could be observed more signiifcantly in mice after the treatment with RPL8-DC. The mice receiving the therapy of RPL8-DC were able to survive much longer than the mice receiving control therapy. Conclusion:The DC pulsed by RPL8 protein can inhibit the growth of melanoma.
RESUMO
Objective:To investigate the effect of IGN4 gene trasfection on SGC-7901 cells,and the possible mechanism for its anti-tumor effect .Methods:Ad-ING4 was obtained by gene recombination and packaging technique in vitro.The expression of ING4 mRNA and protein were analyzed by RT-PCR and western-blot respectively.The effect of Ad-ING4 on growth of SGC-7901 cells was detected by MTT.Apoptotic cells were detected by Laser Scan Co-focal Microscope (LSCM).The expression of p21 in SGC-7901 cells was analyzed by western-blot.Results:After infection with Ad-ING4,the expression of ING4 mRNA and protein were showed in SGC-7901 cells detected.The proliferation of SGC-7901 cells was inhibited significantly(P
RESUMO
Abstract Objective:To explore the suppression of curcumin on leukemia cell line HL60/DAR. Methods: The suppression of curcumin onleukemia cell line HL60/DAR was studied by MTT;the apoptosis was studied by flow cytometric Annexin V/PI dual labeling technique and fluo-rescence microscope;the change in apoptosis related gene bcl-2 was studied by flow cytometry.Results: CUrcumin suppressed the growth ofHL60/DAR obviously IC50 were 8.94,5.2l,3.82 ?g/ml for 24,48,72 h respectively. Curcumin induced Hl60/DAR cells to apoptosisdeath. CUrcumin suppressed the expression of bcl-2. Conclusion: Curcumin can suppress the growth of HL60/DAR cells.