Expression of nucleolar protein 14 and CD31 in pancreatic cancer mouse model and its correlation with tumor progression / 中华外科杂志

Objective@#To investigate expression of nucleolar protein 14(NOP14) and CD31 in pancreatic cancer mouse model and its correlation with tumor progression.@*Methods@#Clinicopathological data of 5 patients with pathologically confirmed pancreatic ductal adenocarcinoma(PDAC) and hepatic metastasis between January 2013 and December 2015 was collected in Department of General Surgery, Peking Union Medical College Hospital. Immunohistochemistry staining was employed to detect the expression of NOP14 in matched primary PDAC and relevant metastasis.Pancreatic cancer cells with NOP14 stably knocked down were established by transfecting lentivirus with NOP14 targeted silencing RNA.The inhibition efficacy was detected by quantitative real time PCR and western blot.Microvascular density(MVD) in pancreatic cancer transplantation mouse model was determined by CD31 immunohistochemistry staining analysis and correlated with NOP14 expression and tumor progression.@*Results@#NOP14 had a significant higher expression in liver metastasis than primary pancreatic adenocarcinoma (2.09±0.45 vs. 1.31±0.27, P=0.028). NOP14 was knocked down 86 percent on mRNA level determined by qPCR and 78 percents on protein level detected by western blot. MVD was significantly decreased in NOP14-inhibited tumor from both pancreatic cancer cells subcutaneously and orthotopically grafted tumor mouse model with the value of 61.40±13.85 vs. 85.53±14.59 (P=0.041) and 38.33±10.91 vs. 59.33±15.37(P =0.037), respectively. Besides, MVD was positively associated with tumor volume(r=0.842, P<0.01) and metastasis (r=0.726, P=0.008).@*Conclusion@#NOP14 presents higher expression in hepatic metastasis of pancreatic adenocarcinoma and might promote tumor progression by increasing microvascular density.

Development of laparoscopic hernia repair and prevention and treatment of complications / 中华消化外科杂志

Ventral hernia is a very common surgical problem with its incidence gradually increasing due to aging population,and it has significantly threat to quality of life.Laparoscopic hernia repair is a kind of minimally invasive surgery based on tension-free hernia repair,which has become an effective way for treatment of ventral hernia after decades of development.Besides,the classic surgical approaches for adult inguinal hernia include intraperitoneal onlay mesh,transabdominal peritoneal and totally extraperitoneal repairs.However,some related complications including vascular injury and bleeding,postoperative pain,nerve damage,seroma,intestinal obstruction,infection and relapse have been increasingly reported with the extensive applications of laparoscopic ventral hernia repair.Surgeons still need to pay more attentions and take appropriate measures to prevent such events.Complications could be reduced by strictly following the indications of different laparoscopic hernia repair surgeries with a careful consideration of the advantages and disadvantages,understanding their pathogenesis,improving the laparoscopic operation techniques,getting familiar with the local anatomical structures and standardizing the surgical procedures.Establishing a correct and standard surgical training system will further shorten the learning curve of surgeons to promote the progression and development of hernia surgery in China.

Roles of NF-κB signaling pathway in regulatory network of pancreatic cancer metastasis / 国际外科学杂志

Pancreatic cancer is one of the most malignant tumors with a high mortality rate attributed to its widespread metastasis.A number of cellular signal transduction pathways involved in multiple genes play an important role in regulating this complex metastatic cascade of pancreatic cancer.NF-kappa B is one of the crucial signaling pathways.Studies has indicated that NF-kappa B could modulate a series of biological events relevant to tumor progress by controlling multiple targeted genes expression,such as cell proliferation,anti-apoptosis,angiogenesis,epithelial-mesenchymal transition,inflammation,stress response,etc.Furthermore,it can also up-regulate Hedgehog and MMPs signaling pathways.To help us better understand the potential mechanism and identify more sensitive tumor markers and selective targets,this review will underline the significant roles of NF-kappa B signaling pathway in regulatory network of pancreatic cancer metastasis.

Investigation of microRNA-373 function and mechanism in HepG2 cell growth suppression induced by 5-fluorouracil / 中华肝胆外科杂志

Objective To investigate the inhibitory effect of 5-fluorouracil (5-FU) on hepatocellular carcinoma (HCC) cell growth and to elucidate its potential molecular mechanism.Methods Real-time PCR analysis was conducted to determine the expression of miR-373 in HCC tissue specimens and HCC cell lines.The expression of miR-373 was also evaluated in HepG2 cells after 5-FU treatment.Western blot analysis was performed to detect the protein levels of PPP6C,a verified target of miR-373,with transfection of miR-373 mimics or 5-FU treatment.A rescue assay was conducted to investigate the cell growth in HepG2 cells by using CCK-8.Results miR-373 expression was up-regulated in both HCC tissues and cell lines.miR-373 expression depicted about 2.94-fold augment in HepG2 cells as compared to normal liver cells control (P ＜0.01).5-FU treatment led to a significant decrease of miR-373 levels (approximately 50％,P ＜0.01,48 h) and resulted in a marked increase of PPP6C protein (approximately 2.1-fold,48 h) in HepG2 cells.The overexpression of miR-373 could prevent the impact of 5-FU treatment on cell growth in HepG2 cells and CCK-8 assay showed that HepG2 cell growth was rescued approximately 81％ and 84％ at 24 h (P ＜ 0.05) and 48 h (P ＜ 0.01),respectively.Conclusion 5-FU can repress endogenous miR-373 level,which activates the expression of downstream targeted gene PPP6C,thereby exerting an inhibitory effect on HepG2 cells.

Design of Chock-vault Antenna for Injurious Interventional Thermotherapy / 航天医学与医学工程

Objective To design a chock-vault antenna for injurious interventional thermotherapy and to evaluate antenna performance change when structure parameters of the antenna are adjusted. Methods Finite element method was used to simulate the distributions of the reflection coefficient and the specific absorption rate (SAR) of the chock-vault antenna of different structure parameters for microwave thermotherapy human muscle tissue model when it worked at 2 450 MHz. The chock-vault antenna for injurious interventional thermotherapy had been optimized. Results This antenna was made.And the reflection coefficient and SAR were measured with human muscle tissue model experiment. The simulation results were validated. Conclusion The SAR distribution of the improved choke-vault antenna does not depend on depth of the insertion tissue. The reflection coefficient can be reduced greatly. The top energy distribution is reasonable.