Cloning, expression and characterization of a new endo-β-N-acetylglucosaminidase from Streptomyces alfalfae / 生物工程学报

Endo-β-N-acetylglucosaminidase is used widely in the glycobiology studies and industries. In this study, a new endo-β-N-acetylglucosaminidase, designated as Endo SA, was cloned from Streptomyces alfalfae ACCC 40021 and expressed in Escherichia coli BL21 (DE3). The purified recombinant Endo SA exhibited the maximum activity at 35 ºC and pH 6.0, good thermo/pH stability and high specific activity (1.0×10⁶ U/mg). It displayed deglycosylation activity towards different protein substrates. These good properties make EndoSA a potential tool enzyme and industrial biocatalyst.

Effects of mesalamine on the expression of TNF-α, IL-6, IL-17 and intestinal barrier function with ulcerative colitis / 中国生化药物杂志

Objective To investigate the effect of mesalazine on the expression of TNF-α, IL-6, IL-17 and intestinal barrier function in patients with ulcerative colitis. Methods 76 patients with UC from January 2015 to April 2016 in The Fifth Central Hospital of Tianjin were collected and randomly divided into control group and observation group with 38 cases in each group. After admission were given maintenance of water and electrolyte, basic acid-base balance and nutritional support treatment, and the control group were treated with conventional drug sulfasalazine (SASP) treatment, two tablets each time, four times once day, four weeks for each course, the observation group was treated with mesalazine, four tablets each time, three times once day, four weeks each course of treatment. The levels of TNF-α, IL-6, IL-17, L/M and Baron endoscopic scores in the two groups were observed after two courses of treatment. The efficacy and side effects of the two groups were compared. Results No dropout or dropout cases in this study, two groups after the treatment of TNF-α, IL-6, IL-17, L/M, Baron scores were significantly decreased (P<0.05), but the observation group after treatment the above indexes were all significantly lower than the control group (P<0.05), the total effective rate of the observation group was 89.47%(34/38) higher than that of the control group 71.05%(21/38), the adverse reaction rate of 13.16% (5/38) was lower than that in the control group 34.21% (13/38), the differences were statistically significant(P<0.05). Conclusion Compared with conventional drug SASP, the effect of on the expression of TNF-α, IL-6 and IL-17 in serum of patients with UC and the improvement of intestinal barrier function can be effectively suppressed, which has the advantages of clinical efficacy and low adverse reaction rate.

Normalizing TSH level prevents postoperative recurrence of common bile duct stone / 中华普通外科杂志

Objective To investigate the impact of thyrotropic hormone (TSH) on recurrence rate of common bile duct stone (CBDS).Methods The clinical data of 268 cases of primary or recurrent CBDS undergoing surgery was analyzed.According to whether screening preoperative TSH level routinely,we assigned the patients into two groups,unchecked group with 171 cases and screened group with 97 cases.The postoperative recurrence rates in 36 months between two groups were compared.Results The recurrence rates of unchecked group and screened group were 3.5％,12.9％,16.9％ and 0.0％,5.2％,8.2％ respectively in 12-,24-,36-months,there was statistically significant difference between two groups (x2 =4.029,P ＜ 0.05).In unchecked group,patients ≥ 60 years had a significant higher recurrence rate than ＜ 60 years patients (x2 =6.485,P ＜ 0.05).In screened group,there was no statistically significant difference between ≥60 and ＜ 60 patients (x2 =0.142,P ＞ 0.05).In those 34 patients with a high TSH level in the screened group,normalizing the level from (6.23 ± 1.44) μIU/ml to (2.91 ±0.74) μIU/ml by oral intake of thyroid hormone postoperatively,led to the recurrence rates of 0％,5.9％,8.8％ in 12-,24-,36-months,which was not significantly different from those with normal TSH (x2 =0.022,P ＞ 0.05).And that,there was not statistically different between the young and elder patients in those 34 cases for the 12-,24-,36-month recurrence rates (x2 =0.086,P ＞ 0.05).Conclusions Some CBDS patients may be with high level of TSH.Normalizing TSH level may be conducive to a reduced postoperative recurrence rate of CBDS.

The modified BCLC staging system improves predictability of early intrahepatic recurrence for hepatocellular carcinoma following curative hepatectomy / 中华肝胆外科杂志

ObjectiveTo evaluate the modified Barcelona Clinic Liver Cancer (BCLC) staging system for predictability of intrahepatic recurrence for patients with hepatocellular carcinoma (HCC) following curative hepatectomy.MethodsA retrospective study was conducted on 197 consecutive patients with HCC who underwent curative hepatectomy in our department from Jan.2008 to Jan.2011.Univariate and multivariate analyses using Cox proportional hazard model were used to evaluate possible association between clinicopathologic factors and early postoperative intrahepatic recurrence (ER).Receiver operating characteristics (ROC) analysis with calculation of the area under the curve (AUC),sensitivity,and specificity were applied to define the cutoff point values for possible meaningful continuous variables where appropriate.A comparison between the differences in AUC was used to assess BCLC and a modified BCLC (M-BCLC) staging system for their predictive ability of ER.Risk stratification according to calculated M-BCLC was applied to find differences of ER at various time points after curative hepatectomy.ResultsDuring follow-up,111 patients developed ER.The 6-,9-,12-,18- and 24-month cumulative recurrent rates were 26.9％ (53/197),37.6％ (74/197),45.2％(89/197),53.8％ (106/197) and 56.3％ (111/197),respectively.Multivariate analysis revealed thatthe severity of concomitant cirrhosis,elevated AFP≥185.6 μg/L and BCLC staging were risk factors of ER.A M-BCLC was proposed based on the results of multivariate analysis.The severity of cirrhosis and elevated AFP values were included in the BCLC staging.This M-BCLC exhibited better performance.It predicted at different time points of ER at postoperative 9,12,18 and 24 months to be significantly better with M-BCLC than BCLC using AUC drawn from ROC.No significant difference was found with ER prediction at 6 months.The M-BCLC also demonstrated a ER prediction with AUC of 0.710 (95％ CI,0.630-0.790) and achieved a sensitivity of 83.0％,a specificity of 51.9％as calculated from ROC with M-BCLC≥2.913.Further risk stratification according to the M-BCLC at various cutoff point values revealed the ER occurrence rates amongst the different risk groups to be significantly different when compared with the median ER time (17.9 mons,9.9 mons vs 5.7 mons,x2=25.770,P=0.000,Log-Rank test).ConclusionA modified BCLC staging system based on multivariate analysis improved the predictability of ER following curative hepatectomy for HCC.

Anatomic resection for hepatoceilular carcinoma ≤ 5 cm: a Meta analysis / 中华普通外科杂志

ObjectiveTo evaluate the impact of anatomic and non-anatomic liver resection on prognosisofpatientswithsmallhepatocellularcarcinoma( HCC ) usingaMeta-analysis.MethodsLiterature on anatomic versus non-anatomic liver resection for the treatment of small HCC ( ≤5 cm) was retrieved. ResultsFour nonrandomized controlled trials were included consisting of 776 patients:484 undergoing anatomic liver resection and 292 non-anatomic resection.The age ranged from 53.4 to 63.0 years.Male ∶ female ratio was 3.56 ∶ 1.87.1％ patients were Child-Pugh class A.Most patients (94.5％ ) had a single tumor.No significant differences were found conceming the 1,3,and 5 year disease-free survival rate between the two groups.There was no significant difference in overall survival and disease-free survival between the two groups at 1,3,and 5 years.Sensitivity analysis found anatomic resection was superior to non-anatomic resection in 3 year disease free survival rate (OR =0.72,95％ CI:0.52 - 0.99,P =0.04). ConclusionsAnatomic liver resection elevated the 3 year disease free survival rate of patients with small hepatocellular carcinoma when compared with non-anatomic hepatectomy but failed to further elevate long-term disease free survival and overall survival.

Early intervention of acute pancreatitis accompanying choledocholithiasis by laparoscopic choledochotomy and choledochoscopy / 中华内分泌外科杂志

Objective To explore the feasibility and validity of laparoscopic choledochotomy and choledochoscopy for treament of patients with acute pancreatitis accompanying commom bile duct stones. Methods A total of 102 patients acute pancreatitis accompanying common bile duct gall stones were treated in our institution between January 2007 and November 2009. Among them, 43 patients underwent laparoscopic choledochotomy and choledochoscopy within 72h after admission entered our study group. They all had a laparscopic cholecystectomy and choleldochotomy and choledochoscopy to retrieve common bile duct stones. Of these, 13 patients undergoing pancreatic capsule incision and peritoneal lavage. Fifty-nine patients undergoing traditional conservative treatment firstly were used as a control group. Of these, 46 were performed laparscopic surgery and choledochotomy after smoothly recovery from pancreatitis. 13 underwent emergency open operation due to complications of pancreatitis. Results In the gastrointestinal function recovery time, amylase recovery time, length of stay and hospitalization cost, there was a significant difference between study group and the control group (P<0.05). Conclusions Our study provides evidence for the good clinical efficacy of early implementation of laparoscopic choledochotomy and choledochoscope for treatment of choledocholithiasis and acute pancreatitis.

Correlation of the age and sex with the survival rate of tumor cells in patients with colorectal tumor / 中国组织工程研究

BACKGROUND: Chemotherapy has been the very important adjunctive treatment for the patients with large intestine cancer. However, obvious individual difference exists in the sensitivity of the patients to the chemotherapeutic drugs, and the difference is related with the age and sex of the patients or not?OBJECTIVE: To make an exploratory discussion of that whether the difference of the sensitivity of chemotherapeutic drugs exists in different ages and different sexes of the patients with epidemiological investigation of the tumor cell survival rate.DESIGN: Controlled experimental study based on pathological samples.SETTING: General surgery department of an affiliated hospital of a medical college.PARTICIPANTS: Tumor cell samples of 169 cases of colorectal cancer tissue obtained from patients with colorectal cancer at the Department of General Surgery of the affiliated hospital of North Sichuan Medical College during the period from January 2001 to January 2003 were involved as subjects. The patients, 97 males and 72 females, were made a definite diagnosis of the large intestine cancer by operation and pathological examination and have not been treated with chemotherapy before operation.METHODS: The sensitivity of chemotherapy drugs were measured on the survival tumor specimens of 169 patients with colorectal carcinoma with Methyl thiazolyl tetrazolium(MTT) test method in vitro. The differences of different ages and different sexes were analyzed in patients.MAIN OUTCOME MEASURES: The absorbance values of tumor cell 72hours after treatment with chemotherapeutic drugs.RESULTS: There was no obvious significance of the tumor' s sensitivity to chemotherapeutic agents in different ages and sexes in patients with colorectal cancer( P ＞ 0.05).ONCLUSION: The individual difference of sensitivity for chemotherapeutic agents in patients with colorectal cancer is not related with the age and gender, needless to consider age and gender in selecting chemotherapeutic agents for different individuls.

Effect of recombinant human growth hormone on CEA,cAMP and cGMP of transplanted human colonic carcinoma in nude mice / 中国普通外科杂志

0.05);but statistical significance was found between the ?-hGH group with rhGH+GPT group and CPT group (P 0.05).Conclusions The results demonstrate that ?-hGH had no influence on the level of CEA,cAMP and cGMP of the transplanted colonic COLO-320 cell line carcinoma in nude mice.