Killing effect of cytotoxicty T lymphocyte primed by two different methods preparation of dendritic cells pulsed with antigen on Tca8113 cells in vitro / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the feasibility of dendritic cells (DCs) vaccine on the therapy of tongue carcinoma and find the better way of antigen load.</p><p><b>METHODS</b>The antigen peptides of Tca8113 cells were obtained by acid eluted technique and repetitive freeze thaw method. Separating T cell and inducing dendritic cells were obtained from human peripheral blood monocyte. Divided into three groups: Weak acid elution method antigen group, anti-freeze-thaw method antigen group, and the control group (without tumor antigen). T cells and UCs were mixed to culture by different effector-target ratio. Using MTT assay measured the quantities of absorbance and calculated stimulation index. Dendrtic cells pulsed with antigen were mixed with T cells by different effector-target ratio. MIT assay was used to measure the quantities of absorbance and calculate killing rate.</p><p><b>RESULTS</b>DCs vaccine was constructed successfully. DCs vaccine can induce T lymphocytes to kill Tca8113 cells and display the dose-effect relationship. There was significant difference among the three groups. The acid eluted and repetitive freeze thaw groups were better than the control group. The acid eluted group was better than repetitive freeze thaw group.</p><p><b>CONCLUSION</b>DCs vaccine can induce T lymphocytes to kill Tca8113 cells. The antigen peptides obtained by acid eluted technique is better than repetitive freeze thaw method in immunotherapy of tongue cancer.</p>

Study of increased sensitivity on Tca8113 cell line to cisplatin by nm23-H1 in vitro / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the mechanism of sensitivity variation to cisplatin caused by nm23-H1.</p><p><b>METHODS</b>The samles was divided into two groups: Tca8113 group and Tca8113/nm23-H1 group. Using MTT and flow cytometer, the changes of cell mortality rate, apoptosis and mitochondrial membrane potential were detected. By VG PQ Excell, the changes of the intracellular platinum were detected.</p><p><b>RESULTS</b>In vitro the cell mortality rate and apoptosis were increased in Tca8113/nm23-H1 group, comparing with Tea8113 group. Mitochondrial membrane potential was decreased in Tca8113/nm23-H1 group. The intracellular platinum was increased significantly in Tca8113/nm23-H1 group. This effect could be inhibited by oubain which was an inhibitor of Na+/K+-ATP.</p><p><b>CONCLUSION</b>nm23-H1 can increase the sensitivity of cisplatin on Tca8113 cell line. The mitochondrial membrane potential was decreased by nm23-H1 so that intracellular platinum was increased and finally increased the apoptosis or necrosis.</p>

Effect on xenograft of nude mouse by combination therapy of nm23-H1 and protein-cisplatin / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the effect of protein-cisplatin and nm23-H1 therapy on the tumor of nude mouse.</p><p><b>METHODS</b>The 15 BALB/C female mice were divided into three groups, control group, protein-cisplatin group and protein-cisplatin+nm23-H1 plasmid group. Tca8113 were injected into the mice subcutaneously with the concentration of 3.1 x 10(6) cells/mL. After two weeks, the mixture of lipofectin and nm23-H1 was injected around xenograft of nude mouse. After three days, the protein-cisplatin was injected around xenograft. The weight of mouse, the volume and the weight of xenograft were measured.</p><p><b>RESULTS</b>The weight of mouse was lightest in control group. The volume and weight of the transplanted tumor were lightest in nm23-H1 +protein-cisplatin group.</p><p><b>CONCLUSION</b>The combination therapy of nm23-H1 and protein-cisplatin can effectively inhibites the growth of xenograft in nude mouse.</p>

The study on the regeneration of skeletal muscles after denervation / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the degeneration and regeneration of skeletal muscle after denervation.</p><p><b>METHODS</b>Denervation was carried out in gastrocnemius muscles in 30 adult BALB/C mice by cutting the sciatic nerve. The gastrocnemius muscles were removed at 1, 2, 4, 8, 12, 16 weeks after denervation, respectively. Specimens were processed for histological study and immunohistochemical technique.</p><p><b>RESULTS</b>Muscle fiber atrophy followed by degerneration and regeneration was observed in the early period of denervation. Fusion of the regenerated muscle cells with each other followed by degeneration of the cells and growth of fibro-connective tissue were observed in the later stage. The expression of myoglobin and actin decreased in 1-4 weeks after denervation. The postive expression of the proteins was observed in some 8 weeks' cells and in many degenerated 12-14 weeks' muscle cells.</p><p><b>CONCLUSION</b>Degeneration and regeneration may coexisted in the denervated muscles. The regenerated muscle cells can't fully develop due to the deficit of nerve regulation and degenerate again. The regenerated muscle cells will melt each other and can't develop to mature muscle fiber in the later stage.</p>