1.Functions of DNA methyltransferase and methylation in tumor generation
International Journal of Surgery 2008;35(8):537-540
Adjustment of epigenetics is closely related with transfer modulation of tumor-related genes. DNA methylation is one of the significant functions of modulation of genetic epigenetics. Abnormal DNA methylation is intensively involved in generation and development of tumor while DNA methylation is cata- lyzed and maintained by DNA methyltransferase(DNMT). So profound study on funetions of DNMT is of great significance to realize generation of abnormal methylation and functions of abnormal methylation in tumor generation and development.
2.Dynamic change and prognostic significance of serum IL-18 in a-cute pancreatitis
International Journal of Surgery 2008;35(9):583-586
Objective To study the dynamic change and prognostic significance of serum IL-18 in acute pancreatitis,and to explore the relationship between the APACHE Ⅱ score and prognosis of. Acute pancreati-tis. Methods According to the clinical diagnosis and criteria for acute pancreatitis, 34 patients with AP were divided into severe acute pancreatitis (SAP) group( n = 12 ) and mild acute pancreatitis (MAP) group (n = 22). Sixteen normal individuals were used as the control group ( n = 16.). The serum IL-18 was detected by ELISA. Results IL-18 in the SAP group was higher than that in the MAP group. In the MAP group, there was significant positive correlation between APACHE Ⅱ and IL-18 ( r = 0.98 ,P < 0.01 ). Conclusion IL-18 plays an important role in the development of acute pancreatitis, and it may be a valuable index to predict the severity of AP.
5.Mechanisms of CD4+ CD25 + regulatory T-cell suppression in tumor immunity
Li LIU ; Wenchuan WU ; Baochi LIU
International Journal of Surgery 2011;38(4):259-262
CD4 + CD25 + regulatory T- cell (Treg) play essential roles in maintaining self- tolerance, immune homeostasis and cancer immune system. Treg can suppress immune responses against self antigens or non-selfantigens such as tumor antigens. The immunosuppressive functions of Treg are widely acknowledged and have been extensively studied. Recent studies demonstrate the existence of Treg at tumor sites, implying that these Treg may induce antigen-specific and local immune tolerance. This review will discuss the ligands, mechanisms of immune suppression of Treg and its potential roles in cancer therapy.
6.Research progress of proteomics in colon cancer
Xianjun XIA ; Lijun ZHANG ; Baochi LIU
International Journal of Surgery 2011;38(12):839-842
Colon cancer is a common and deadly disease with high rising incidence rate.Proteomics has already become one of the hot topic and maken great progress in the research of colon cancer pathogenesis,early diagnosis,treatment and prognosis.In recent years,more and more colon cancer-associated biomarkers have been identified through proteomics-based approaches.This review will summarize the research progress of proteomics in colon cancer.
7.Treatment of upper gastrointestinal bleeding due to hepatic portal hypertension in cirrhosis
Baochi LIU ; Lin LANG ; Jinxi SUN
International Journal of Surgery 2021;48(1):5-9
Cirrhosis of the liver results in portal hypertension, which is a tortuous and dilated portal vein. The hemorrhage of digestive tract caused by dilation and rupture of lower esophagus and gastric fundus is the main cause of death in patients with cirrhosis. The treatment methods of digestive tract hemorrhage in liver cirrhosis include drug therapy, endoscopic hemostasis, interventional therapy to control hemorrhage and surgical hemostasis. These methods are mainly used to control hemorrhage and solve hypersplenism, but cannot solve the fundamental problem of cirrhosis. Stem cells can repair damaged liver cells and help restore liver function. Under the guidance of B-ultrasound, precise intrahepatic portal vein puncture and infusion of autologous bone marrow nucleated cells can improve cirrhosis through autologous bone marrow stem cells. Little damage to patients, little risk. Cell therapy combined with conventional therapy can treat both the symptoms and the root causes of digestive tract hemorrhage in cirrhosis.
8.Surgical treatment for HIV/AIDS patients with surgical complications
Baochi LIU ; Li LIU ; Hui CHEN ; Lei LI ; Hongzhou LU
International Journal of Surgery 2009;36(9):602-605
Objective Probe the value and the operation risk for HIV/AIDS patients with surgical compli-cations. Methods Investigated 27 HIV-infected patients(male 26, female 1, age 27-74 years) were investi-gated. All patients had pre-operative detection of immune function, standardized surgical procedures, careful surgical process to reduce the operation damage, continuous infusion of coagulation factors for haemophilia during operation, conventional application of antibiotics to prevent infection and prompt treatment of compli-cations. Results No incision infected in 8 cases of class one incision, 1 incision infected in 6 cases of class two incision, 3 cases were not healed in 30 days after operation in 13 cases of class three incision. One case died of severe sepsis 12 days after operation, the others discharged with recovery or improvement. Conclu-sion Suitable operation and treatment method may obtain curative effect for HIV-infected patients.
9.Gene polymorphisms association studies in sepsis
Yu FANG ; Lei LI ; Baochi LIU ; Gangqiao ZHOU
International Journal of Surgery 2009;36(5):325-328
Although significant advances have been made in both the development of therapeutic strate-gies and the understanding of pathophysiological mechanisms of sepsis, the mortality of severe sepsis and septic shock still remains unacceptably high worldwide. Current prediction models based on socio-demo-graphic and clinical risk factors fail to explain fully why a particular patient either develops or succumbs to sepsis. In recent years epidemiological studies have suggested a strong genetic relationship on the suscepti-bility and outcome of sepsis. With the completion of Human Genome Project and International HapMap Pro-ject, the identification of susceptibal genes contributing to sepsis may allow more precise use of interven-tions, such as targeted therapy of sepsis is an appealing strategy. In this review, we summarize a broad over-view of genetic nomenclature, study designs, and problems of these genetic association studies.
10.Effects of heat shock protein 90 inhibitor 17-DMAG on proliferation and apoptosis of colon cancer cell line HT-29
Xianjun XIA ; Fang MA ; Lijun ZHANG ; Baochi LIU
International Journal of Surgery 2013;(5):310-314,封3
Objective To investigate the effects of Hsp90 inhibitor 17-DMAG on proliferation and apoptosis of human colon cancer cell line HT-29.Methods HT-29 cells were treated with 17-DMAG.The cell proliferation inhibition rate was evaluated by CCK-8 assay.Apoptosis of HT-29 cells by 17-DMAG was delineated by DAPI staining assay and Annexin V PI double labeling FCM was used to determine cell apoptotic rate.Furthermore,Westen blotting analysis was used to determine caspase-3 and cleaved caspase-3 protein expression.Results 17-DMAG time-dose-dependently inhibited the proliferation of HT-29 cells.After 0.1μmol/L,0.25μmol/L,0.5μmol/L,1.0μmol/L,2.5μmol/L and 5μmol/L 17-DMAG exposured for 24 hours,the cell proliferation inhibition rate was (14.36±0.95)%,(22.17± 1.15)%,(28.45±1.16)%,(35.04±1.58)%,(46.85 ±2.44)%,(57.19 ± 2.06)% respectively,after exposured for 48 hours,the cell proliferation inhibition rate was increased to (20.80±1.17)%,(27.55 ±0.65)%,(33.33 ±1.23)%,(46.20±4.76)%,(55.45 ±4.47)%,(61.75 ±2.72) % respectively,after exposure for 72 hours,the cell proliferation inhibition rate was to (29.62 ± 2.27) %,(39.19 ± 1.74)%,(44.29 ±2.00)%,(50.66 ±2.17)%,(58.84 ±3.18)%,(70.74 ±2.65)%.DAPI staining showed that HT-29 cells treated with 17-DMAG displayed chromatin condensation and nuclear fragmentation which are typical changes of apoptosis.Annexin V PI double labeling FCM showed that when HT-29 cells were exposed to 0,0.25,0.5,1.0 and 2.5(μmoL/L) 17-DMAG for 24 hours,the total apoptotic rate for 24 hours was (2.72 ±0.57)%,(5.38 ±0.46)%,(6.88 ±0.52)%,(10.44 ±0.32)% and (17.87 ±4.66)% respectively.(P <0.05).In addition,the expression of procaspase-3 decreased,while cleaved caspase-3 increased in the presence of 17-DMAG at different concentrations for 24 hours.Conclusion 17-DMAG can time-dose-dependently inhibit proliferation and promote apoptosis of HT-29 cells in vitro.