Objective To investigate the effects of recombinant adenovirus-mediated co-transfection of carcinoembryonic antigen (CEA) gene and erythropoietin (EPO) gene on promoting hematopoietic stem cells directly producing erythrocyte vaccine against colon cancer. Methods The expression adenovirus vectors carrying CEA and EPO or green fluorescent protein (GFP) gene were constructed respectively, and recombinant adenovirus carrying CEA, EPO or GFP were packaged and produced respectively. The bone marrow-derived mesenchymal stem cells (MSCs) of mice were isolated and cultured in vitro by anti-CD117 magnetic bead separation, and were transfected with CEA (CEA group), EPO (EPO group) or GFP (blank vector group), co-transfected with CEA and EPO (CEA-EPO group). The expressionsof CEA and EPO gene and its protein after transfection in supernatant fluid of culture were detected by realtime-PCR and Western blot method in each group. We had checked and obtained the vaccine with co-transfection of CEA gene and EPO gene by cell red line marker antibody CD71 and GPA, then we carried on experiments with the vaccine in vitro and in vivo. There were 4 groups in our trail: blank vector group, CEA group, EPO group, and CEA-EPO group. Results We had successfully gathered the hematopoietic stem cells, flow cytometry analysis result showed that there were significant differences before and after purification for positive selected samples (P<0.05). The expressions of double genes (CEA-EPO gene) and protein showed CEA-EPO gene were successfully transfected into the hematopoietic stem cells. We had confirmed erythrocyte vaccine with co-transfection of CEA and EPO gene by antibody CD71 and GPA with flow cytometry. The monocytes cytotoxicity on colon cancer cell line CT26 showed that lysis of target cells of CEA-EPO group were higher than those of other 3 groups when in proportion of 40∶1 (P<0.05). In the experimentation of neoplasma format, the volume of tumor and mortality were smaller or lower, but survival time was longer of CEA-EPO group in2 weeks after treatment (P<0.05). Conclusions The erythrocyte vaccine with co-transfection of CEA gene and EPO gene has efficient anti-tumor effects on colon cancer. Not only can promote hematopoietic stem cell directly producing erythrocyte vaccine, but also can produce tumor antigen vaccine against colon cancer.
Objective To evaluate therapeutic effect of tile shape perineal stapled prolapse resection in treatment of rectal prolapse. Methods The clinical data of 31 patients with rectal prolapse underwent tile shape perineal stapled prolapse resection in the Renmin Hospital of Wuhan University from December 2013 to August 2015 were retrospectively analyzed. All the patients with rectal prolapse were performed the tile shape perineal stapled prolapse resection with general anesthesia and (or) epidural anesthesia. The prolapse was completely pulled out and then axially cut open with a linear stapler in the lithotomy position. Finally, the prolapse was resected stepwise with the curved stapler at the prolapse’s uptake. Results There were 8 males and 23 females in the 31 patients. The age was (65.8±3.2) years old. There were 14 patients with Ⅱ degree and 17 patients with Ⅲ degree prolapses. The median course was 5.8 years. The 31 patients were followed up for 0.5–7.0 months. Of 31 cases, the 24 cases were cured and 7 cases were better. It was found out that there was a significant difference between the number of axially cut open with a linear stapler and the weight of specimen (P<0.05). And there was a significant difference between the number of axially cut open with a linear stapler and the recurrence (P<0.05) too. When the number of axially cut open with a linear stapler were 4 for Ⅱ degree and 3 for Ⅲ degree, the treatment had been proved to be the highest efficacy. Conclusions Preliminary results of limited cases in this study show that tile shape perineal stapled prolapse resection is safe and effective in treatment of rectal prolapsed. Key of operation is that prolapse is completely pulled out and then axially cut open with a linear stapler at some o’clock for 2–4 points and rectal valves are formed. Prolapsed is resected stepwise with curved stapler at prolapse’s uptake. When number of axially cut open with a linear stapler are 4 for Ⅱ degree and 3 for Ⅲ degree, it could achieve the best therapeutic effect.