Establishment of human gastric cancer model in normal immune mice based on micro-carrier 6 / 中国肿瘤临床

Objective:To establish a mouse model of gastric cancer by inoculating MKN45 cells into mice with normal immune function utilizing microcarrier technology. Methods:A total of 60 male C57BL/6 mice were randomly divided into three groups, namely, 2D, con-trol, and 3D groups, according to the coculture system of MKN45 and microcarrier. The mouse models of gastric carcinoma were estab-lished by hypodermic injection. The time of tumorigenesis, rate of tumor formation, and pathological features were observed in each group. Results:In the 3D group, the time of tumor formation was short, whereas the rate of tumor formation was high (80%). No de-tectable tumor formations were observed in the 2D and control groups. HE and immunohistochemical staining of the transplantation tumor model showed evident characteristics of human gastric cancer. Conclusion:A human gastric cancer model in normal immune mice was successfully established. The onset and development mechanism of gastric cancer could be more effectively investigated in mice with normal immune function through this model. Moreover, a more valuable and new animal model for the research and devel-opment of anticancer drug was established.

Allele genetypes and homology analysis of MSP-1 and CSP gene of Plasmodi-um vivax in Shandong Province / 中国血吸虫病防治杂志

Objective To analyze the genotypes and homology of MSP?1 and CSP gene of Plasmodium vivax in Shandong Province,so as to provide the evidence for case traceability. Methods A total of 12 blood samples were collected from P. vivax?infected cases in Shandong Province in 2011. Parasite genomic DNA was extracted. Primers were designed according to MSP?1 and CSP gene sequences of P. vivax. Then Nested PCR,enzyme digestion,sequencing and sequence alignment,and homolo?gous analysis were performed. Results The MSP?1 gene of all the 12 samples from P. vivax?infected cases were detected with a 470 bp PCR amplification band,and 350 bp and 120 bp enzyme digestion fragments,which were identified as type Sal?1. An analysis of phylogenetic tree of MSP?1 gene showed that the sequences of 9 indigenous case samples in Shandong Province were located in the same branch,one case sample infected from India was located in the same branch with India strains. All the 12 P. vivax?infected samples covered GDRA(D/A)GQPA sequences in CSP gene,which were identified as type PV?Ⅰ. Of the CSP gene among 12 P. vivax?infected samples,10 samples of indigenous case in Shandong Province and one sample of the case in?fected in Guangdong Province were detected with both 560-840 bp and 150-230 bp PCR amplification bands,which were iden?tified as temperate zone family strain of type PV?Ⅰ. However,one sample from the case infected in India was detected only with a 560-840 bp band,which was identified as tropical zone family strain of PV?Ⅰ. An analysis of phylogenetic tree of CSP gene showed that the sequences of 10 samples from the indigenous cases in Shandong Province and one sample from the case infected in Guangdong Province were located in the same branch,one sample from the case infected in India was located in the same branch with India and Indonesia strains. Conclusion Of all the indigenous isolates in Shandong Province,MSP?1 gene is geno?typed type Sal?1,CSP gene is genotyped temperate zone family strain of type PV?Ⅰ,with a high homology found among the in?digenous isolates.

Construction and identification of pcDNA3-HBsAg-p30-ROP2 expression vec-tor / 中国血吸虫病防治杂志

Objective To construct a multi-gene recombinant pcDNA3-HBsAg-p30-ROP2 expression vector and identify it preliminarily. Methods According to recombinant pcDNA3-p30-ROP2 restriction sites,HBV HBsAg gene sequences of primers were designed and synthesized to amplify target fragment,and then cloned into pcDNA3-HbsAg-p30-ROP2 expression vector. Af-ter sequencing,it was identified finally by restriction enzyme digestion and other molecular biology techniques. Results HBV HBsAg gene segment was amplified by PCR and the multi-gene recombinant pcDNA3-HBsAg-p30-ROP2 expression vector was constructed and identified to be correct as theoretical values. The PCR and restriction enzyme digestion results showed that HBsAg and p30-ROP2 gene in recombinant plasmid were confirmed by DNA sequencing. Conclusion The multi-gene recombinant pcD-NA3-HBsAg-p30-ROP2 expression vector is successfully constructed.

Large trophozoites in blood smear of falciparum malaria:one case report / 中国血吸虫病防治杂志

This paper reports one case of atypical falciparum malaria imported from Africa,whose blood smear contains many large trophozoites,with punctiform or massive brown pigment granules,the body shape of the plasmodium is similar to that of Plas-modium vivax and Plasmodium ovale. After the gene detection by PCR,the case was diagnosed as falciparum malaria. As large tro-phozoites were rarely seen in the peripheral blood of non-severe falciparum malaria cases,much attention should be paid to the identification of Plasmodium falciparum and other plasmodia in microscopic examinations.

Survey of intestinal parasitic infections and related knowledge and behavior of residents in Jiaodong area of Shandong Province / 中国血吸虫病防治杂志

Objective To understand the status of intestinal parasitic infections and the related knowledge and behavior in residents of Jiaodong area of Shandong Province,so as to provide the evidence for making an appropriate preventive and control strategy. Methods A total of 18 villages from 6 counties in Jiaodong area were selected as investigation sites according to the stratified sampling method. The feces samples of the permanent residents aged above 3 years were collected and examined by Kato-Katz technique to find the intestinal parasite eggs,and the children under 12 years old were examined by the method of cellophane anal swab to detect the Enterobius vermicularis eggs. In addition,50 households in each survey sites were randomly selected to in-vestigate the basic family situation and the condition of awareness on prevention knowledge and formation of correct behavior of res-idents by using a structured questionnaire. Results Totally 6 163 residents involved in the feces examinations,and the total in-fection rate of intestinal parasites was 6.91%. The infection rates of Trichuris trichiura,Ascaris lumbricoides and hookworm were 6.56%,0.62%and 0.21%,respectively. The infection rate of E. vermicularis in children under 12 years old was 0.51%. The eggs of Clonorchis sinensis and Taenia solium were not found in this survey. The awareness rate of knowledge about preventing parasitic diseases was 49.54%. The formation rates of washing hands before eating,washing hands after using the toilet,never eating raw fruit and vegetable without washing clean,never working in the field with bare feet,and never drinking unboiled water were 97.78%,91.95%,88.81%,92.42%and 86.48%respectively. Conclusions The infection rate of intestinal parasites is low in Ji-aodong area,but there is a significant difference among different counties. The awareness rate of knowledge about preventing para-sitic diseases is low,but the formation rate of healthy behavior is high. In the future,the health education and the strategy of tak- ing medicine among the key population should be enhanced,and the project of reconstructing safe water supply and lavatory should be advanced.

Team-based learning practice in pathology experimental class under the network environment / 中华医学教育探索杂志

Objective To discuss the effect of team-based learning(TBL)combined with net-work environment in pathological experiment teaching. Methods Totally 112 clinical medical under-graduates were selected as research object. Digital microscope interactive teaching platform under the network environment was used in experimental group(n=56). In pathology experiment teaching,TBL steps of training,teaching plan demonstrating,grouping,teaching task arranging,asking questions, group learning and communicating were implemented. Traditional method (lecture)was used in con-trol group (n=56). Teaching effect was analyzed through questionnaire survey and score analysis. Stu-dents' evaluation on TBL teaching and network environment resources was expressed as percentage. Results In experiment group,average score was (85.5±3.11)points and average final exam score was (83.8±2.53)points,while in control group,average final exam score was (76.4±11.89)points. There were significance differences between the two groups (t=7.018,P<0.01). Surveys showed that most students accepted TBL teaching combined with network environment. Conclusions TBL teach-ing combined with network environment is feasible and effective in the pathology experimental class. Students' learning enthusiasm is generally improved and effectiveness of TBL teaching is satisfactory.

Over-expression and purification of the recombinant p30 antigen of Toxoplasma gondii / 中国人兽共患病学报

To provide the basis for preparation of diagnostic kits and vaccines in Toxoplasma gondii infection, the gene coding for the qualified recombinant p30 protein (SAG1) of this parasite was amplified by PCR, and the amplified gene was cloned into prokaryotic expression vector pET-30a(+) to construct the recombinant plasmid, and then transformed to E.coli DH5α. The positive recombinant plasmid was screened by PCR and double enzymes digestion, and the nucleotide sequence of p30 gene was determined by automated DNA sequencing. Meanwhile, the identified recombinant plasmid was transformed to E.coli BL21(DE3) with the expression of p30 on bacteria induced by IPTG and the expressed protein was identified by SDS-PAGE. The protein obtained was then further purified and refolded, and its biological activity was checked by Western blotting. It was shown that the size of the amplified gene was 750 bp with molecular weight of 30 ku, and this protein could specifically react with monoclonal antibody against p30 protein.

Determination of specific IgG4 for diagnosis and therapeutic evaluation of cerebral cysticercosis / 中华医学杂志(英文版)

<p><b>OBJECTIVE</b>To probe the significance of specific IgG4 in sera of patients with cerebral cysticercosis for diagnosis and therapeutic evaluation.</p><p><b>METHODS</b>Specific IgG4 in sera of patients with cerebral cysticercosis was assessed using colloidal gold-labeled mouse-anti-human IgG4 McAb as probe. The results were compared with the CT image manifestation.</p><p><b>RESULTS</b>The specific IgG4 positive rate in sera of patients with cerebral cysticercosis was 97.8%, whereas sera from patients with other kinds of parasitosis or central nerve system disease and the control group were all negative, except for a weak cross-reaction of sera from patients with hepatic echinococoosis. The determination of specific IgG4 in sera of patients with cerebral cysticercosis during different times of treatment showed that along with an increase in treatment time and improvement of clinical symptoms, specific IgG4 level gradually decreased. The positive rate and intensity of specific IgG4 in sera from patients with cerebral cysticercosis were consistent with the number of cysticercus parasites in the brain and pathologic changes, such as survival, disintegration, death and calcification. Survival of cysticercus in the brain was objectively evaluated using this technique.</p><p><b>CONCLUSIONS</b>The determination of specific IgG4 in sera is a practical method for diagnosis and therapeutic evaluation of cerebral cysticercosis.</p>

Studies on the Immuno-Protection of ROP2 Nuclei Acid Vaccine in Toxoplasma gondii Infection / 中国寄生虫学与寄生虫病杂志

Objective To study the protective effect of ROP2 nuclei acid vaccine in mice.Methods Forty-two BALB/c mice were divided into three groups.Each mouse in experiment group was injected with 50 ?g recombinant plasmid pc-DNA3-ROP2 through musculus quadriceps fexoris.In control groups,each mouse was injected with 50 ?g blank plasmid pc-DNA3 and with 50 ?l PBS respectively.All mice were immunized for three times with an interval of three weeks.The volume was doubled for the final injection in the two plasmid groups.Blood,spleens and lymph nodes of 4 mice in each group were taken for the detection of CD4+,CD8+ T cells and cytokines 2 weeks after the final immunization.The rest mice in 3 groups were challenged with 500 tachyzoites of Toxoplasm gondii RH strain for further observation.Results The vaccine induced strong cellular and humoral immune response.The titer of antibody in serum was high after inoculation and recognized ROP2 protein antigen expressed in vitro.The lymphocyte phenotype was analyzed.CD4+ T cells proliferated sharply(69.5?3.4)%,and the ratio of CD4+/CD8+ increased considerably by(4.69?1.32)%(P