Objective To observe the local immue response and changes of angiogenic factors of tumor cells in Heps-bearing mice after mesenchymal stem cell (MSC) are administrated. And to explore the feasibility and safety of MSC for liver tumors therapy. Methods MSC were obtained through adherent culture method. Phe-notypes of MSC were analyzed by flow cytometry. MSC were labeled with DAPI in vitro. 54 Mice of 8 weeks of age with subcutaneously transplanted liver carcinomas were developed randomly. When the maximal diameters of the tumor reached 0.5 - 0.8cm, they were divided into three groups randomly: MSC group, DAPI group and NS control group. 2 × 10~6 MSC and MSC marked by DAPI were administrated into the mice right rear back tumor tissue. The survival time of the tumor-bearing mice was recorded and the mean survival time was calculated. Immunohistochemical staining was performed to count CD4~+ T cells and CD8~+ T cells in the local tumor,as well as to examine the expression of vascular endothelial growth factor ( VEGF) in tumor cells. Results In the MSC group,the mean survival time was 45 d (95%CI;33 ～56 d) ,in the NS control group, the mean survival time was 33 d ( 95%CI : 28 ～ 37 d). There was a statistical significance in the difference between them ( P < 0.05). Immunohistochemical staining results showed as follow: the number of CD4~+ T cells and CD8~+ T cells in the MSC group decreased significantly in comparison with the NS control group at early stage. The expression of VEGF also decreased obviously in comparison with the NS control group and induced tumor cells necrosis at late stage. The survival time of MSC group was prolonged. Conclusion MSC can engraft in Heps-bearing tumor tissue, and inhibit T lymphocyte cellular immunity at early stage. It can reduce the number of CD4~+ T cells and CD8~+ T cells and promote tumor growth. MSC can down regulate VEGF expression and induce tumor cells necrosis at late stage. By this way,it can prolong the survival time of Heps-bearing mice.

ObjectiveTo observe the effect of betulinic acid(BetA) on the growth of human cytokine induced killer(CIK) cells and the killing activity of CIK cells on the gastric cancer cells in vitro before and after induced by betulinic acid,explore its mechanism.MethodsPeripheral blood mononuclear cell (PBMC) were separated form the healthy and were induced with various of cytokine to become CIK cells in vitro.CIK cells were collected on the tenth day and were induced with betulinic acid in different concentrations,followed by 48 h,the colorimetric methyl thiazolyl tetrazolium(MTT) method assay the proliferation rate of human CIK cells.Flow cytometry (FCM) was used to detect the expression changes of perforin,granzyme B and CD107a of human CIK cells before and after betulinic acid-induced.Lactate dehydrogenase (LDH) release assay was used to measure the influence on cytotoxic activity of CIK cells induced by betulinic acid against gastric cancer cell line SGC-7901 in vitro.Western blot assay was used to measure the extracellular signal-regulated kinase1/2 (ERK1/2),and adapter proteins SH2-domain containing leukocyte protein of 76KD(SLP-76) and linker for activative of T cells(LAT) expression changes of human CIK cells before and after drug-induced.ResultsBetulinic acid can promote CIK cells growth when the concentration were in 0.08-10 μg/ml,the expression of perforin,granzyme B and CD107a of CIK cells were significantly higher than control group(P＜0.05) when the concentration of betulinic acid were in 0.3 μg/ml.In the meanwhile,the cytotoxic activity of CIK cells in vitro against gastric cancer cell line SGC-7901 were also remarkably higher than the control group (P＜0.05).The expression of SLP-76,LAT and ERK1/2 were significantly increased to a certain extent than the control group( P＜0.05 ),when CIK cells were treated with betulinic acid.ConclusionThese results suggest that betulinic acid can promote CIK cells growth in some concentrations and increase the cytotoxic activity of CIK cells against gastric cancer cell line SGC-7901,its mechanism may related with two factors,on the one hand,enhancing the activity of SLP-76,LAT and ERK1/2,on the other hand,increasing the expression of perforin,granzyme B and CD107a on the surface of CIK cells.

Objective To observe the effect of down-regulated CDX2 gene on the migration and invasion abilities of colon cancer cells (SW480 and HT29) and investigate the role and mechanisms of CDX2 gene in occurrence and development of colon cancer metastasis.Methods CDX2 gene in HT29 and SW480 cells was down-regulated using lentivirus RNA interference (RNAi) vector.The interference efficiency of CDX2 was detected by qRT-PCR and Western blotting.The effect of down-regulated CDX2 expression on colon cancer cells'migration and invasion was determined by Transwell and wound heal methods.Then the effects of down-regulated CDX2 on the expressions of epithelial-mesenchymal transition (EMT)-related genes (E-cadherin,ZEB-1,Vimentin,Twist and Snail) were detected by RT-PCR and Western blotting.Results The constructed CDX2 siRNA expression vector could significantly inhibit the expression of CDX2 in HT29 and SW480 cells.Compared with those of the cells transfected with empty vector (LV-NT-shRNA) and non-transfected cells,the migration and invasion abilities of cells transfected with LV-CDX2-shRNA were markedly enhanced (P ＜ 0.05).E-cadherin expression was reduced while expressions of ZEB-1,Vimentin,Twist,and Snail were significantly increased (all P＜0.05).Conclusion Down-regulating the expression of CDX2 can induce the occurrence of EMT,thus enhancing the invasion and migration of colon cancer cells.

Objective    To compare and analyze the short-term efficacy of different surgical methods for Siewert type Ⅰ and type Ⅱ esophagogastric junction carcinoma. Methods    We selected 82 patients who accepted radical resection of esophagogastric junction carcinoma from March 2015 to March 2018 in our department, including 53 males and 29 females, aged 48-72 (61±6) years. The patients were divided into four groups according to the surgical method: a left thoracotomy group (n=14), a laparoscopic left small thoracotomy group (n=33), a thoracoscopic Ivor-Lewis group (n=17), and a thoracoscopic McKeown group (n=18). Their clinical characteristics, operative situations, postoperative complications and survival rate were analyzed. Results    Among the four groups, the left thoracotomy group cost the shortest operation time, followed by laparoscopic left small thoracotomy group, thoracoscopic McKeown group and thoracoscopic Ivor-Lewis group. The thoracoscopic McKeown group/laparoscopic left small thoracotomy group had the least bleeding. The fewest lymph nodes were dissected in the left thoracotomy group and the most in the thoracoscopic McKeown group. The laparoscopic left small thoracotomy group had the lowest total complication rate and the incidence of pneumonia and arrhythmia among the four groups (P<0.05). There was no significant difference in survival rate among the four groups (P>0.05). Conclusion    For Siewert type Ⅰ and type Ⅱ esophagogastric junction carcinoma, thoracoscopy combined with laparoscopic radical resection is safe and reliable. Laparoscopic left small thoracotomy has the advantages of minimal invasiveness and complete lymph node dissection, especially for the patients with poor cardiopulmonary function, which will significantly shorten operation time and reduce postoperative complications, so it is worth to be popularized.

【Objective】 To investigate the clinical application of self-developed magnetic anchoring device for assisting thoracoscopic pulmonary resection. 【Methods】 Eleven patients underwent thoracoscopic pulmonary assisted with resection magnetic anchoring technique at the Department of Thoracic Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, from March to May 2019. Their clinical data were retrospectively analyzed. The operation time, blood loss, blood transfusion volume, postoperative hospital stay, and postoperative complications were recorded. 【Results】 There were seven male and four female patients, with the average age of (51.6±13.9) years (range from 22 to 69 years). Three single-port and eight single-utility-port thoracoscopic surgeries were performed. Magnetic instruments provided good surgical field exposure in all operations. Among 11 surgeries, one was converted to thoracotomy and one to three-hole surgery due to enlargement and adhesion of hilar lymph nodes. The operation time was (107.8±63.1) minutes (range of 27-182 minutes). The blood loss was 50 (10-50)mL (range of 5-1 000 mL). No blood transfusion was needed during the operation. The postoperative hospital stay was (5.0±1.8) days (range of 3-9 days). No postoperative complications occurred in all the patients. 【Conclusion】 Magnetic anchor technique can effectively alleviate the "chopstick effect" in thoracoscopic surgery. Magnetic anchor technique is safe and feasible in assisting thoracoscopic pulmonary resection.