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Objective:To evaluate the association of microsatellite status with clinicopathological features of colorectal cancer patients after surgery.Methods:In total,572 colorectal cancer cases with clear pathological diagnosis and clinicopathological features from the Department of Pathology,Nanjing Drum Tower Hospital from June 2014 to June 2017 were included in the study.Microsatellite status and RAS mutations were detected by polymerase chain reaction.Ki67,EGFR,MGMT,and Lgr5 were detected by immunohistochemis-try.Clinicopathological features were analyzed based on the microsatellite states.Results:In this study,we found MSI-H in 7.0% of all patients,whereas 93.0% cases showed MSS/MSI-L.Compared with MSS and MSI-L colorectal cancer cases,MSI-H colorectal cancer cases showed the following characteristics:1)more likely located in the right colon,2)comparable incidences at different ages,3)ear-ly cancer stage(Ⅰ/Ⅱ)(P=0.003),4)a lower proportion of lymph node metastasis(P=0.023),5)a lower proportion of cancerous nod-ules(P=0.005),6)a lower mutation rate of KRAS(P=0.004),and no mutation of NRAS.There was no significant difference in the posi-tive rates of MGMT,EGFR,Lgr5,and Ki67 between the two groups.Conclusions:Compared with MSS/MSI-L patients,MSI-H patients have specific clinicopathological features.A lower mutation rate of KRAS/NRAS and higher methylation rate of MGMT were also found in MSI-H patients.Our results provide a basis for individual diagnosis and treatment in colorectal cancer.
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Objective A state quo survey of laboratory animal resource in Guangdong province is performed to provide reference data for government management decision-making and market assessment of laboratory animals. Methods We used questionnaires focusing on the laboratory animal facilities with authorization by Guangdong Province Government, which mainly included the production and use of laboratory animals,the qualification of employees and the facilities space. Results The total production and use of laboratory animals(except for the eggs)had been increasing in the last four years. 1.57 million laboratory animals were produced and 0.754 million laboratory animals were used in 2016. There were 2352 employees,roughly the same as in 2015. The facilities space for breeding was 121008 m2,and for animal experiment was 73470 m2,which were rising in the past three years. Conclusions In order to reinforce the industry development of laboratory animals in Guangdong province,some suggestions were given in our study,such as facilitating the application of superiority resource including non-human primate and aquatic laboratory animals,supporting the standardization production of several scarce mice and rats, improving relevant employees' overall level and constructing laboratory animal facilities sharing platform.
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A laboratory animal expert consultation system provides an interactive platform for industry experts and users. Based on intelligent mobile terminal used as the application supporter, the platform combines the internet with laboratory animal to share the experts' knowledge, breaks through temporal and spatial restrictions, and resolves other problems such as poor timeliness of inquire service, knowledge data staticization, and irrational exploitation of internet to gain prompt inquire service. The platform would meet the needs of industry users for real-time aids and bridge the gap between industry experts and users. Thus, the transfer of expert' knowledge is realized in pace with the increasing knowledge resource of this platform to accelerate the transformation of theoretical knowledge into the industry. Our study focuses on the system characteristics, the main frame structure, the design of function module and the system implementation.
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Hyper-osmotic stress is one of the key factors that decrease the efficiency of biological succinic acid production. To increase the osmotic stress tolerance of succinate-producing Escherichia coli, we studied the influence of IrrE, an exogenous global regulator, on cell osmotic stress resistance. Fermentation results showed that cell growth and succinic acid production by the recombinant increased under different Na+ concentrations. Meanwhile, the maximum dry cell mass, glucose consumption and succinic acid concentration increased 15.6%, 22% and 23%, respectively, when fermented in a 5-L bioreactor. Expressing IrrE improved cell resistance to hyper-osmotic stress. Further comparison of intracellular osmoprotectants (trehalose and glycerol) concentrations showed that trehalose and glycerol concentrations in the recombinant increased. This suggested that introduction of IrrE could enhance intracellular osmoprotectants accumulation which conferred cell with improved resistance to osmotic stress.
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Through analyzing the characteristics of the experimental animal industry , supply and demand status and application prospect of mobile internet industry , as themobile Internet +experimental animalscombination to study the function and effect and operation mode of the experimental animals mall platform .The platform will be provide open e-commerce services for experimental animal industry , forming an innovative pattern of resource sharing , mutual benefit and win-win, promote the balanced allocation of the experimental animal industry chain resources , build “effectiveness , efficiency , effect” good operation management environment .
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Objective To investigate the relations and evaluation value of serum thymidine kinase 1 (sTK1) in the treatment of patients withacute exacerbation of chronic obstructive pulmonarydisease (AECOPD). Methods The retrospective treating studies were performed on 104 patients with AECOPD , sTK1 level was de-tected by chemiluminescence dot-blot assay before and after treatment , and the correlation between the expression of sTK1 and CRP after treatment in the two groups was analyzed. Results The levels of sTK1 and CRP in the ef-fective group significantly lowered after treatment (P < 0.05). The expression of sTK1 in the effective group and in the ineffective group after treatment was significantlycorrelated with CRP (P < 0.05). Conclusion sTK1 can be used as a valuable indicator to evaluate the severity of AECOPD and to estimate the efficacy of AECOPD thera-py.
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Purpose To assess the expression of DLL4 in non-small cell lung cancer ( NSCLC) patients and to determine its associa-tion with clinicopathological parameters and prognosis. Methods DLL4 expression was evaluated in NSCLC tissues and adjacent non-cancerous normal lung tissues from 89 patients undergoing surgical treatment by immunohistochemistry. Results DLL4 had high ex-pression in 52 of 89 cases of NSCLC (58. 4%), which was significantly higher than that in adjacent non-cancerous lung tissues (P<0. 05). Moreover, DLL4 overexpression was significantly correlated with TNM stage (P=0. 010 78). Kaplan-Meier survival analysis showed that the overall survival times in patients expressing DLL4 in NSCLC were shorter. Conclusion High level of DLL4 expression is significantly correlated with NSCLC progression and unfavorable prognosis. Thus, DLL4 expression may be used as a clinical param-eter for predictive prognostication of NSCLC patients.
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The present situation , efficacy, problem and strategy of laboratory animal license management in Guangdong Province were reviewed in this article .The laboratory animal license management has been implemented for 10 years and showed good results .Now there are comprehensive management of quality , facilities, personnel, SOP, and unified item bank, and making standard of laboratory animals in Guangdong Province .The legislation of Guangdong laboratory animal management regulations is completed .Guangdong laboratory animal license is increased year by year .The distribution of industry and area is expanded .Through analysis of problems and search for strategy , Guangdong laboratory animal management will be further developed .
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Objective To prepare an influenza A(H1N1) split-virus vaccine and observe its safe-ty and effectiveness. Methods According to the process for preparing seasonal flu split-virus vaccine two batches of vaccine were prepared with the flu A (H1N1) vaccine virus strain recommended by WHO. The pilot products were tested against the requirements of flu split-virus vaccine. Results The quality of the pi-lot vaccine has been tested by National Control Laboratory and conformed to the requirements. Nine hundred and sixty volunteers received one dose of vaccine containing either 15 μg or 30 μg of hemagglutinin. The re-suits indicated the both seroconversion rate and protection rate were higher the 70%. The GMT of HIAb of the volunteers who received 1 dose of 15 μg increased significantly by 15, 39, 37 and 25 times compared to those before vaccination in the age groups of 3-11, 12-17, 18-59 and ≥60, respectively. And 26, 72, 68 and 36 times rise were found in the postvaccinated volunteers of 30 μg group. The total adverse reaction rates of 15 μg and 30 μg dose group were 29.38% and 43.75%, respectively. The grade 2 adverse reaction rates of 15 μg and 30 μg dose group were 6.25% and 15.42%, and the grade 3 adverse reaction rates of 15 μg and 30 μg dose group were 0.83% and 1.46%, respectively. No serious adverse reactions were found. Conclusion The influenza A (H1N1) split-virus vaccine prepared according to the requirements of season-al flu vaccine is safe and effective.