Information literacy is the essential literacy in medical education and training of information analysis ability is the difficulty in information literacy education .Described in this paper is the trial to help postgraduates and long-term schooling undergraduates select their study orientation and topics in ChinaMedical University , including their course targets, contents and teaching outcomes.

Adolescent ; Child ; Female ; Fever ; etiology ; Histiocytic Necrotizing Lymphadenitis ; classification ; complications ; diagnosis ; Humans ; Lymph Nodes ; pathology ; Male

Platelet-derived growth factor (PDGF), a potent chemotactic and mitogenic factor, is involved in the regulation of hematopoiesis and platelet production. Our studies demonstrate the presence of functional PDGF receptors (PDGFR) on human megakaryocytes/platelets and CD34(+) cells, and their ability to mediate a mitogenic response. PDGF promotes the ex vivo expansion of human hematopoietic stem (CD34(+)) and progenitor (CD41(+)) cells. More significantly, PDGF enhances the engraftment of human CD45(+) cells and their myeloid subsets (CD33(+), CD14(+) cells) in NOD/SCID mice. PDGF also stimulates in vitro megakaryocytopoiesis via PDGFR and/or the indirect effect on bone marrow microenvironment to produce TPO and other cytokines. It also shows a direct stimulatory effect of PDGF on c-Fos, GATA-1 and NF-E2 expressions in megakaryocytes. We speculate that these transcription factors may be involved in the signal transduction of PDGF on the regulation of megakaryocytopoiesis. PDGF also enhances platelet recovery in mouse model with radiation-induced thrombocytopenia. This radioprotective effect is likely to be mediated via PDGFR with subsequent activation of the PI3K/Akt pathway. It provides a possible explanation that blockage of PDGFR may reduce thrombopoiesis and play a role in imatinib mesylate-induced thrombocytopenia.
Animals ; Hematopoietic Stem Cells ; cytology ; Humans ; Megakaryocytes ; cytology ; Mice ; Platelet-Derived Growth Factor ; metabolism ; Receptors, Platelet-Derived Growth Factor ; metabolism ; Thrombopoiesis

Objective To screening up-regulated protein kinases and their inhibitors in order to provide new targets for molecular thera-py of nasopharyngeal cancer.Methods GEO database and SAM software were employed to screen the up-regulated protein kinase gene in nasopharyngeal cancer.Based on DAVID database,the regulating functions of kinases were identified.The inhibitors of up-regulated kinase genes were identified by Selleckchem database.Literature mining was used to screen the potential anti-cancer drugs.Results Totally 2360 differentially expressed genes including 21 up-regulated protein kinases (CHEK1,CHEK2,PRKDC,AURKA,VRK2,STK17A,MELK,NU-AK1,TRPM7,MASTL,AXL,BUB1,BUB1B,CDK4,TTK,CDC7,CASK,AKT3,TBK1 and PBK)were identified in the whole genome profi-ling (Fold Change≥2,P <0.05).The results of function analysis showed the up-regulated genes were enriched in 10 function terms such as‘protein amino acid phosphorylation’‘phosphorylation’‘phosphate metabolic process’‘mitotic cell cycle’‘cell cycle phase’‘regulation of cell cycle’,and so on.The Selleckchem database analysis showed there were 9 up-regulated protein kinases equipped with 51 inhibitors which were proved already.The results of literature mining showed that 18 inhibitors of them had a few studies (less than 10 literatures)in cancer terms,and there was a potential to become new drugs to treat nasopharyngeal cancer.Conclusion A total of 21 up-regulated protein kinases were identified,and they might promote the nasopharyngeal carcinoma by regulating functions such as the cell-cycle control pathway.Their ki-nase inhibitors may have a potential role in anti-cancer treatment,which provided a new target point for molecular therapy of nasopharyngeal cancer.

Objective To discuss the clinical significance of nephroscopic surgery for simple renal cysts. Methods A 2~4 cm incision was made below the 12th costal interspace. Through the incision the nephroscopic decortication was performed in 26 patients with simple renal cyst. Results The operation time was 20~80 min (mean, 30 min) and the postoperative hospital stay, 3~)6 days (mean, 4 days). No blood transfusion was required and no severe complications were noted. Follow-up observations for 3~)12 months (mean, 8 months) in the 26 patients found no recurrence. Conclusions Mini-incision nephroscopic decortication for renal cysts is feasible and mini-invasive, with advantages of simplicity of performance and quick postoperative recovery.

Objective To evaluate the role of early growth response gene1 (Egr-1) in liver injury in taurocholate-induced acute pancreatitis rat model. Methods Twenty-four male rats were divided into 4 groups. Egr-1 immunohistochemistry staining and pancreatic pathologic scoring were assessed, and the serum levels of AST, LDH, TNF-? and IL-1 ? were measured. Egr-1 mRNA levels of primary hepatocyte culture stimulated with TNF-? and pretreated primary hepatocytes with PD98059 followed by TNF-? stimulation were also observed. Results Egr-1 expression of liver correlated with degree of liver injury in acute pancreatitis in rat, and high Egr-1 mRNA expression of primary hepatocyte was observed when hepatocyte injury occurred. After pretreated with PD98059, TNF-?-stimulated hepatocytes showed a lower level of Egr-1 mRNA compared with hepatocytes without pretreatment. Conclusions Egr-1 may play an important role in liver injury in acute pancreatitis, and this effect depended partly upon extracellular signal-regulated kinase 1/2 (ERK1/2) pathway.

Objective Based on protein-protein interaction network,gene modules were identified to provide new targets for molecular therapy of nasopharyngeal carcinoma.Methods GEO dataset (GSE12452)and SAMsoftware were employed to screen the differentially ex-pressed gene in nasopharyngeal carcinoma.Protein-protein interaction network was established by using String database.Based on the net-work,the gene modules were identified by using bioinformatics gene module analysis method.GO analysis was used to analyze the function of gene modules.Results In this study,2 634 differentially expressed genes were identified in nasopharyngeal carcinoma.There were 4 729 protein-protein interaction pairs among the differentially expressed genes according to the String database.We established the protein-protein interaction network based on these pairs.Seven gene modules were identified by bioinformatics methods.GO analysis results showed that the function of the gene modules including regulation of cell cycle,glycosylation,cell adhesion,oxidation reduction and so on.Conclusion There are 7 gene modules in protein-protein interaction network in nasopharyngeal carcinoma.These modules may play important roles in the progression and development of nasopharyngeal carcinoma.Our finding can provide a new sight for molecular diagnose and therapy of nasopharyngeal carcinoma.

ObjectiveTo evaluate left ventricular (LV) function and dyssynchrony in patients with dilated cardiomyopathy (DCM) and complete left bundle branch block (CLBBB) by three-dimensional speckle tracking imaging(3D STI).Methods3D STI was performed and analyzed using TomTec 4-D LV analysis 3.0 software in 37 DCM patients with CLBBB and 25 healthy volunteers.The global 3D,longitudinal,circumferential,radial strains were measured.LV dyssynchrony was evaluated by the standard deviation of time to peak from 3D strain of 16 segments related to the heart cycle(3D-SDI).ResultsIn control group,uniformity in the average value of 3D strain was observed between apical,mid-ventricular and basal levels (P ＞ 0.05).Global 3D,longitudinal,radial and circumferential strains had excellent correlations with LV ejection fraction ( r =- 0.92,- 0.84,- 0.78 and 0.81,respectively,P ＜0.01).Compared with control group,global 3D,longitudinal,radial and circumferential strains were significantly lower in DCM patients ( P ＜0.01 for all).3D-SDI in DCM patients with CLBBB was significantly longer than that of volunteers ( P ＜0.01).3D-SDI increased with worsening LV systolic function regardless of QRS duration (P ＜0.05).ConclusionsWhen image quality is optimal,3D STI represents a promising novel technique for assessment of global LV function and dyssynchrony.

ObjectiveTo assess left ventricular (LV) twist in Beagle dogs with rapid-pacing induced heart failure by 3-dimensional speckle tracking imaging.MethodsSeventeen adult beagle dogs underwent rapid right ventricular pacing (RVP) to induce heart failure.Right ventricles were paced at 260 beats/min for 3 weeks.Apical full-volume acquisition of the LV was obtained in conscious animals at baseline and the end of 3-week rapid pacing.Peak LV apical rotation(AP-Prot) and basal rotation (MV-Prot) accompanied with peak twist (Ptw) and torsion were automatically calculated by TomTec 4D LV Analysis 3.0 software.The relation between LV twist and QRS duration was further studied.Results After 3 weeks of rapid ventricular pacing,AP-Prot,MV-Prot,Ptw decreased significantly [At-Prot:(13.96 ± 2.00) ° vs (5.85 ± 0.58)°；MV-Prot:(3.34± 0.38)° vs (2.13 ± 0.44)°； Ptw:(16.31 ± 2.01)° vs (7.08 ± 1.16)°,all P ＜0.05].Dogs with heart failure were divided into two groups according to the QRS duration:pQRSd group with QRS≥100 ms and nQRSd group with QRS＜100 ms.No significant difference was found in AP-Prot and MV-Prot between two groups ( P ＞0.05).In the pQRSd group,the peak of apical rotation occurred earlier than the peak of basal rotation [(162.89 ± 14.33) ms vs (91.43 ± 15.45) ms,P ＜0.05],which might resulted in further worsening of peak LV twist [pQRSd:(6.02 ± 0.74)° vs nQRSd:(7.91 ± 0.53)°,P ＜0.05].Conclusions LV twist dynamics was a good indicator of LV systolic function and had the potential to evaluate LV systolic dyssynchrony.

Overexpression of human ether-脿-go-go (eag) related gene (hERG) has been found in a broad range of human leukemia cell lines and primary human leukemia. The block of hERG protein might be a potential therapeutic strategy for leukemia. Gambogic acid (GA) has recently exhibited marked anti-tumor potency on solid tumors of various derivations. Here, we investigated the anti-leukemia effects of GA and its relation to the regulation of hERG in K562 leukemia cells in vitro. K562 cells were treated with various concentrations of GA (0.125-8.0 micromol/L) for 0-72 h. MTT assay was used to evaluate the inhibition effect of GA on the growth of K562 cells. Cell apoptosis was measured through both Annexin-V FITC/PI double-labeled cytometry and transmission electron microscopy. Cell cycle regulation was studied by a propidium iodide method. RT-PCR and Western blot were applied to detect the expression level of hERG in K562 cells. GA presented striking growth inhibition and apoptosis induction potency on K562 cells in vitro in a time- and dose-dependent manner. The IC(50) value of GA for 24 h was 2.637+/-0.208 micromol/L. Moreover, GA induced K562 cells arrested in G(0)/G(1) phase, accordingly, cells in S phase decreased gradually, and no obvious changes were found in G(2)/M phase cells. Under the transmission electron microscopy, apoptotic bodies containing nuclear fragments were found in GA-treated K562 cells. After treatment with GA of 2.0 micromol/L for 24 h, the percentage of apoptotic cells was increased from 4.09% to 18.47% (P<0.01). Overexpression of hERG channel was found in K562 cells, while GA could down-regulate it at both protein and mRNA levels (P<0.01). It was concluded that GA exhibited its anti-leukemia effects partially through down-regulating the expression level of hERG channel in K562 cells, suggesting that GA may be a potential agent against leukemia with a mechanism of blocking hERG channel.