Porphyromonas gingivalis exacerbates ulcerative colitis via Porphyromonas gingivalis peptidylarginine deiminase / 国际口腔科学杂志·英文版

Ulcerative Colitis (UC) has been reported to be related to Porphyromonas gingivalis (P. gingivalis). Porphyromonas gingivalis peptidylarginine deiminase (PPAD), a virulence factor released by P. gingivalis, is known to induce inflammatory responses. To explore the pathological relationships between PPAD and UC, we used homologous recombination technology to construct a P. gingivalis strain in which the PPAD gene was deleted (Δppad) and a Δppad strain in which the PPAD gene was restored (comΔppad). C57BL/6 mice were orally gavaged with saline, P. gingivalis, Δppad, or comΔppad twice a week for the entire 40 days (days 0-40), and then, UC was induced by dextran sodium sulfate (DSS) solution for 10 days (days 31-40). P. gingivalis and comΔppad exacerbated DDS-induced colitis, which was determined by assessing the parameters of colon length, disease activity index, and histological activity index, but Δppad failed to exacerbate DDS-induced colitis. Flow cytometry and ELISA revealed that compared with Δppad, P. gingivalis, and comΔppad increased T helper 17 (Th17) cell numbers and interleukin (IL)-17 production but decreased regulatory T cells (Tregs) numbers and IL-10 production in the spleens of mice with UC. We also cocultured P. gingivalis, Δppad, or comΔppad with T lymphocytes in vitro and found that P. gingivalis and comΔppad significantly increased Th17 cell numbers and decreased Treg cell numbers. Immunofluorescence staining of colon tissue paraffin sections also confirmed these results. The results suggested that P. gingivalis exacerbated the severity of UC in part via PPAD.

Application of hybrid teaching based on the rain classroom in the teaching of periodontology for undergraduates / 中华医学教育探索杂志

Objective:To study the application and effect of hybrid teaching based on the rain classroom in the teaching of periodontology for undergraduates.Methods:Sixty-four stomatological undergraduates in Phase 101 were selected as experimental group, and 62 in Phase 100 as control group. The hybrid teaching based on the rain classroom were conducted in experimental group, and mind mapping were used before and after class to help students understand and expand the content of class. The traditional teaching was adopted in the control group. SPSS 17.0 was applied to compare the differences between the written test scores and teaching satisfaction evaluation of the two groups. The learning behavior data of the students in experimental group before, during and after class were collected and analyzed.Results:The score of the written test in the experimental group were significantly better than that in the control group ( t=2.97, P<0.05). The result of questionnaire showed that the experimental group was significantly more satisfied with the improvement of lecture efficiency ( t=2.71, P<0.05) and self-learning ability ( t=4.35, P<0.05). The majority (82.55%) of students in the experimental group are in favor of the rain classroom; 89.06% of students finished the preview before class, and 67.19% of them completed the review after class. Conclusion:The hybrid teaching based on the rain classroom can be applied to the teaching of periodontology, which can effectively improve the learning quality and initiative of the students.

On the making and application of animations for medical teaching / 中华医学教育探索杂志

This study explores the application of animation in medical teaching. On the one hand, the status quo of the application of animation in medical teaching was analyzed by conducting questionnaire survey for the effect of animation-enhanced teaching of the biology course; on the other hand, new animations were made by the researchers to analyze its effect on the students' self-study. The results showed that the scores of the students receiving text and teaching animation resources were significantly higher than that of students receiving only textual information in the learning process (P<0.01), and the same goes for the number of the students that complete the >75％ of the learning content. The results showed that the teaching animation can improve the students' self-study performance and raise their interest in self-study.

A retrospective evaluation of the performance of 2 blood culture media in detection of bloodstream infection: clinical comparison of BACTEC and BacT/Alert systems / 中华检验医学杂志

Objective To evaluate the clinical performance of the BACTEC Plus aerobic,BACTEC Lytic anaerobic,BacT/Alert aerobic and anaerobic blood culture media in detection of bloodstream infections.Methods Retrospective study was conducted.A total of four blood culture bottles from each inpatient with suspected bloodstream infections were collected and analyzed from June 2013 to September 2015 in Peking University People's Hospital.The four bottles,including BACTEC Plus aerobic,BACTEC Lytic anaerobic,BacT/Alert FA aerobic and BacT/Alert FN anaerobic media,and was incubated for 5 days in the BacT/Alert 3D and BACTEC FX instruments,respectively.Time to detection (TTD) and positive rate in detecting bacteria of the two systems were evaluated by Wilcoxon test and Chi-square test.Results Among 2 189 total cultures collected,20 were excluded because of blood shortage and 201 (9.27％) were positive for pathogens.The positive rates of BACTEC Plus aerobic media and BacT/Alert FA aerobic media were 75.3％ (140/186) and 69.4％ (129/186) (x2 =1.625,P=0.202),respectively.While,the positive rates of BacT/Alert FN anaerobic media and BACTEC Lytic anaerobic media were 81.8％ (99/121) and 63.6％ (77/121) for total organisms,respectively (x2 =10.083,P =0.001).A significant difference in TTD was detected in BACTEC Plus aerobic media[11.0 (8.0-16.0) h] and BacT/Alert FA aerobic media[13.9 (10.4-18.7) h] (Z =-5.240,P ＜ 0.001).BACTEC Lyric anaerobic media[8.0(7.0-10.0) h] had a shorter TTD (Z =-4.299,P ＜ 0.001) than BacT/Alert FN anaerobic media[11.3(9.3-12.7) h].The positive rates of BACTEC and BacT/Alert system were 74.13％ (149/201) and 74.63％ (150/201),respectively,compared with taking one set from each system.Conclusions BACTEC media has a shorter TTD and almost the same bacterial recovery,and lower false positive rate than the BacT/ Alert media.

Analysis of prognostic factors in patients with stageⅠB2-ⅡA2 uterine cervical cancer treated with a combintion of neoadjuvant chemotherapy and surgery / 中国癌症杂志

Background and purpose:The aim of this study was to analyze the prognostic factors in uterine adenocarcinoma and adenosquamous carcinoma treated with a combination of neoadjuvant chemoradiotherapy and surgery.Methods:Clinicopathologic data from 50 patients with stageⅠB2-ⅡA2 uterine cervical cancer were collected from the First Afifliated Hospital of Bengbu Medical College between Apr. 2005 and Oct. 2011. All patients underwent neoajuvant chemoradiotherapy, followed by radical hysterectomy and pelvic lymph node dissection. Before surgery, an intravenous chemotherapy was given. A particular vaginal brachytherapy was given to those with tumor diameter≥6 cm. The survival and recurrence in patients were analyzed retrospectively to investigate the prognostic factors. Results:In 50 patients withⅠB2-ⅡA2 uterine adenocarcinoma and adenosquamous carcinoma, 15 died during the follow-up period. The 2-year and 5-year progression-free survival rates were 80.12% and 72.24%, respectively, and median progression-free survival was 68 months. The 2-year and 5-year overall survival rates were 95.38% and 73.56%, respectively, and median overall survival was 80 months. Univariate analysis revealed that pelvic lymph node metastasis, cervical stromal invasion, parametrial infiltration, tumor diameter reduction 0.05). Multivariate Cox proportional analysis revealed that pelvic lymph node metastasis and tumor diameter reduction after radiation and chemotherapy were the independent prognostic factors in patients with cervical cancer. Conclusion:The combination of neoadjuvant chemotherapy and surgery improves the resectable rate of patients withⅠB2-ⅡA2 uterine adenocarcinoma and adenosquamous carcinoma. Pelvic lymph node metastasis and tumor diameter reduction after radiation and chemotherapy are the independent prognostic factors in patients with cervical cancer.

Spatial resolution evaluation of 64-slice helical computed tomography / 医疗卫生装备

To put forward spatial resolution detection requirements of 64-slice helical CT based on analyzing the present situation of CT spatial resolution detection. The requirements for spatial resolution in the existing industrial standards were analyzed, and some test data were used to prove the deficiency of the standards. Spatial resolu-tion detection requirements were proposed for 64-slice helical CT, and the factors affecting spatial resolution were ex-plored. The deficiencies in the original standards were eliminated. The proposed requirements may facilitate the spatial resolution detection of 64-slice CT, and thus can enhance image quality for clinical diagnosis and treatment.

Regulatory effects of miR-146a on Cryptococcus neoformans-induced inflammation factors production in THP-1 cells / 中华微生物学和免疫学杂志

Objective To investigate the regulatory effects of miR-146a on inflammation factors production in C ryptococcus neoformans treated THP-1 cells.Methods Cryptcoo ccus neoformans strains were heat killed .Fluorescence quantitative RTP-CR and ELISA were used to detect the levels of IL -1βand TNF-αin THP-1 cells treated with heat-killed Cryptococcus neoformans.In addition, the production of IL-1βand TNF-αwere analyzed before and after Dectin-1or TLR 4 blocked .THP-1 cell lines that were respectively transfected with miR-146 a mimics and inhibitors were constructed and the production of IL-1βand TNF-αin these cell lines were analyzed after interfered with Cryptococcus neoformans.Results With the interference of heat-killed Cryptococcus neoformans, the expression of miR-146a was up-regulated in THP-1 cells, but was down-regulated after Dectin-1 or TLR4 blocked.The expressions of IL-1βand TNF-αinduced by heat-killed Cryptococcus neoformans were enhanced in miR-146a mimics transfected THP-1 cells, but was inhibi-ted in inhibitors transfected THP-1 cells.Conclusion Heat-killed Cryptococcus neoformans could up-regu-late miR-146a expression in THP-1 cells via Dectin-1 and TLR.miR-146a could negatively regulate the ex-pressions of IL-1βand TNF-αinduced by Cryptococcus neoformans.

Construction PG0839 gene-defective mutant of Porphyromonas gingivalis / 华西口腔医学杂志

<p><b>OBJECTIVE</b>In order to determine the function of PG0839 gene from Porphyromonas gingivalis (P. gingivalis) W83 strains, we intended to create a mutant in the PG0839 gene by homologous recombination.</p><p><b>METHODS</b>1 584bp PG0839 gene fragment was amplified, digested by BamH I and EcoR I, purified and ligated to pUC19. The recombinant plasmid was designated as pPG0839-1. The erm cassette (2 101 bp) was inserted into the EcoR V restriction site of the PG0839 gene. The resultant recombinant plasmid, pPG0839-2, was used as a donor in the electroporation of P. gingivalis W83. After electroporated and selected on erythromycin brain heart infusion plates, a single colony was collected and designated as PG0839 gene-defective mutant.</p><p><b>RESULTS</b>A mutant in PG0839 gene was created by insertional inactivation, and inactivation of PG0839 gene was confirmed by restriction endonuclease digestive, sequencing, polymerase chain reaction (PCR) and reverse transcription PCR.</p><p><b>CONCLUSION</b>A PG0839 gene-defective mutant was created successfully.</p>

MiR-146a regulate the proliferation and interleukin-2 production of T helpers from primary biliary cirrhosis patients / 中华风湿病学杂志

Objective To investigate the effect of miR-146a on the proliferation and interleukin (IL)-2 production of T helper cells from primary biliary cirrhosis (PBC) patients.Methods MiR-146a in the peripheral blood mononuclear cells (PBMC),monocytes,T helper cells,cytotoxic T cells and B cells from 20 confirmede PBC patients and age/sex matched healthy controls were detected by quantitative PCR.By gainand-loss of function,the miR-146a's effect on anti-CD3/anti-CD28 activated T helper's proliferation and IL-2 production ability were measured by CCK-8 approach and enzyme linked immunosorbent assays (ELISA),respectively.Statistical analysis were carried out by t-test.Results PBMCs (0.46±0.20 vs 1.00±0.26; t=7.47,P＜0.01),T helpers (0.33±0.13 vs 1.00±0.14; t=6.15,P＜0.01) and monocytes (0.56±0.11 vs 1.00±0.11; t=4.97,P＜0.05),but not B cells (0.91±0.06 vs 1.00±0.14; t=0.97,P＞0.05) and cytotoxic T cells (0.98±0.15vs 1.00±0.12; t=0.22; P＞0.05) from PBC patients had lower miR-146a expression level than that of healthy controls.Inducible up expression of miR-146a was observed in PBC patients'T helpers stimulated with antiCD3/anti-CD28 (1.00±0.18 vs 9.12±2.05; t=8.81; P＜0.01).The activated T helpers from PBC patients had higher proliferative ability [PBC:0.35±0.06 (A); healthy controls:0.26±0.04 (A); t=2.83; P＜0.05] and increased IL-2 production [PBC: (685.60±109.19 pg/ml)]; Healthy controls: [(512.20±72.26) pg/ml; t=2.96; P＜0.05 ] than those of healthy controls.For activated T helpers,the proliferation ability,as well as IL-2 production,was enhanced by miR-146a.Conclusion MiR-146a can down regulate the proliferation and IL-2 releasing of activated T helpers.The reduced miR-146a expression enhances IL-2 production and promotes proliferation of T helper of PBC patients,thus,may be involved in the pathogenesis of PBC.

Increased expression of microRNA-146a in peripheral blood mononuclear cells of patients with chronic immune thrombocytopenic purpura and its clinical significance / 中华微生物学和免疫学杂志

Objective To investigate the increased expression of microRNA-146a(miR-146a) in peripheral blood mononuclear cells (PBMC) of patients with chronic immune thrombocytopenic purpura (ITP) and its clinical significance. Methods Twenty-eight patients with chronic ITP and 28 healthy controls matched with age and gender were enrolled in this study. Fluorescent quantitative PCR reaction was used to detect the relative expression of miR-146a in their PBMC. The serum concentration of TNF-α, IL-2,IL-1 β and IFN-γ were measured by ELISA. CCK-8 method was used to detect the proliferation ability of PBMC , which transfected with miR-146a mimics or inhibitor and then stimulated with platelet . Results The relative expression of miR-146a in ITP patients was higher than that of healthy controls. The increased expression of miR-146a was negatively correlated with the serum TNF-α, IL-2 and IFN-γ. The PBMC transfected with miR-146a mimics had reduced expression of IL-2 and proliferation when stimulated with platelet.In contrast, the opposite effect was observed with the miR-146a inhibitors transfection. Conclusion MiR146a was involved in the pathogenesis of chronic ITP by controlling IL-2 production and PBMC proliferation.Thus, it may be a potential therapy target for chronic ITP.

Application of transurethral vapor-resection of the prostate for bladder outlet obstruction in patients with prostate cancer / 中国基层医药

Objective To evaluate the application of the transurethral vapor-resection of the prostate(TU- VRP) for bladder outlet obstruction(BOO) in patients with prostate eaneer(PCa). Methods Of 33 patients with BOO. 18 were definitely diagnosed with PCa and after treatment they still had symptoms of BOO;15 cases were di- agnosed with benign prostate hyperplasia(BPH). All patients underwent TUVRP for BOO. Results All cases were successfully done. Postoperative complications included transient urinary ineontinenee in 5 ,and gross hematuria in 9. 27 patients were followed up(10-36 months).8 cases died of PCa,with a mean survival of 31 months.5 cases died of other diseases. After treatment, PSA levels decreased to ( 10.2 ± 6.7) μg/L. The average residual urinary volume (RU) decreased to (39.7 ± 13.9) ml, and the average IPSS was (8.7 ± 1.6 ). Compared with those of preoperation, the differences were statistically significant ( P < 0.05 ). Conelnsion TUVRP is a reliable treatment for prostate cancer with bladder outlet obstruction.

Change of lipopolysaccharide activity-modulating protein in serum of cirrhosis patients and its clinical significance / 中国康复理论与实践

@#ObjectiveTo explore changes of lipopolysaccharide (LPS), lipopolysaccharide-binding protein (LBP), bactericidal/permeability-increasing protein (BPI), soluble CD14 (sCD14) in blood of cirrhosis patients and their clinical significance.MethodsSerum samples of 45 cirrhosis patients were detected with chromogenic limulus amebocyte lysate assay for LPS and detected with ELISA for LBP, BPI and sCD14. While, serum samples of 15 normal subjects were used as controls.ResultsLevels of LPS, LBP, BPI and sCD14 in blood of cirrhosis patients with liver function being grade A, B and C were significantly higher than that in normal subjects. Also, those indexes fore mentioned were obviously higher in died cirrhosis patients than that in survived cirrhosis patients.Conclusion High levels of LBP, LPS and relative deficiency of BPI in cirrhosis patients accompanied with intestinal endotoxemia (IETM) may significantly increase the sensitivity of body to endotoxin.

Potential protective mechanism of rhIL-11 pretreatment on intestinal ischemia/reperfusion injury of rats / 中国康复理论与实践

@#ObjectiveTo explore the molecular mechanism of protective effects of recombinant human interleukin-11( rhIL-11) pretreatment on intestinal ischemia/reperfusion (I/R) injury of rats.MethodsThe I/R model of rat was produced by clampi ng the superior mesenteric artery for 1 hour, animals were divided randomly into the normal control group (A), I/R group (B), normal saline control group? and rhIL-11 pretreatment group (D). In group C and D, animals were administered w ith saline(0.25ml/rat/day)or rhIL-11 (600μg/kg/day) two days before the oper ation. Rats in different groups were sacrificed at 6 hours and 24 hours after re perfusion respectively. Intestinal apoptosis was detected by TUNEL staining, and the expression of bcl-2, caspase 3 and caspase 8 were determined by immunohist ochemistry. Meanwhile pathologic pictures were detected by hematoxylin-eosin (HE) staining.ResultsHE and TUNEL examinations showe d that in group D, the intestinal barrier was damaged obviously slighter than th at in the group B and group C, with decreased apoptosis cells, meanwhile, expres sion levels of caspase 3 and caspase 8 were lower, and bcl-2 was higher than th e group B and group C.Conclusions The protective e ffect of rhIL-11 pretreatment on rat intestinal I/R injury might be caused by t hat the expression of activities of caspase 3 and caspase 8 are inhibited and b cl-2 is activated.

Effect of batroxobin on vascular smooth muscle cell proliferation induced by balloon angioplasty in rat aorta / 中国介入心脏病学杂志

A model of vascular smooth muscle cell proliferation was estabolished by balloon angioplas-ty in rat's aorta. We found that treatment with batroxobin decreased plasma fibrinogen level after angio-plasty, and inhibited the increase in smooth muscle cell count of injured vascular wall and incorporation rate of H-TdR into vascular tissues effectively. The results suggest that batroxobin may have clinically prospective significance in prevention and therapy of angioplasty-induced restenosis.

Isolation and culture of tumor stem cells in human retinoblastomas / 中国病理生理杂志

AIM:To isolate and culture tumor stem cells in human retinoblastomas (RTSC). METHODS: Retinoblastoma (RB) single cells acquired from fresh tumors of RB patients by enzyme digestion were seeded in serum-free medium at a density of 1?10~8 cells/L. Clonal cultures were plated at a density of 1?10~6 cells/L. Secondary tumor spheres were triturated again and passaged in fresh medium. The sphere-forming, proliferation and differentiation assays were performed. RT-PCR and immunocytochemistry were performed to identify the RTSC and differentiated cells. RESULTS: All RB tumors studied produced proliferating neurosphere-like tumor spheres, which were also passaged multiple times. These tumor spheres had the capability to self-renew, proliferate in SFM medium, expressed retinal progenitor cell related genes, and differentiated into neurons and glia when they were transferred to differentiation conditions.CONCLUSION:Our findings demonstrated that there were subsets of tumor stem cells resembling retinal progenitor cells in human RB, which can be isolated, cultured in SFM. The RTSC may be original cells of RB tumor, and also become the new target of tumor therapy.

Advance of computer-aided diagnosis in mammography / 医疗卫生装备

The primary method and clinical application of computer-aided diagnosis in mammogram is introduced Acquiring digital mammography X image by digital scanner,implementing the assistant diagnosis function of computer.Techniques of computer-aided diagnosis in mammogram are summarized and its prospects are described.[Chinese Medical Equipment Journal,2008,29(2):70,79]

Effect of adiponectin on endothelial function / 中华内分泌代谢杂志

0.05), but did inhibit activity of iNOS (P