Myc is an important oncogene family, whose members can interact with microRNAs (miRNAs) as oncogene or tumor suppressor. The complicated regulatory network between Myc and miRNAs is crucial for tumorigenesis. This interaction was also reported in many studies involving stem cells, and it opened a new chapter for current cancer research. This review is about the progress in the research of Myc and its related miRNAs as oncogene or tumor suppressor, as well as their roles in cancer stem cells.

Objective To evaluate an ideal way to prepare the extracellular matrix of urethra. Methods An orthogonal design [L9(34)] was used in the experiment.Urethras were obtained from 37 rabbits,among which 27 segments were randomly selected and were decellularized following the orthogonal design in 9 groups.The whole experiments were repeated for 3 times.After the decellularization process,the acellularity of the ECM was examined by haematoxylin-eosin staining.The optimum way was found out through comparing the numbers of the remained cellular elements by computer image analysis.An ideal way was found by statistic analysis.Then the ECM was obtained from 10 pieces of urethras by the optimum methods.The scanning electronic microscopy was used to confirm the decellulary matrix.Subsequently,the ECM was used as a graft for replacement. In 10 rabbits,the urethral defect were replaced with the urethral ECMs. At sacrifice,10 days,3 weeks,6 weeks and 24 weeks,the grafts was taken out,and the regeneration was confirmed by the haematoxylin-eosin staining. Results ECM resulting from different dedellularization process in the urethras are different in the numbers of remaining cellular elements.There are no cellular elements in the 7th and the 9th group of the tissues.The cellular elements was not found by the scanning electronic microscopy in the ECM getting from the optimum methods.In the animals with replacement,histologic examination showed complete regeneration 24 weeks post operation. Conclusions The best way to prepare the ECM of urethra is A 3B 2C 3.

Contents in orthopaedic are independent relatively and finding out the internal relations during them is helpful to improving the effect of orthopaedic teaching.Transfer theory is important tools for clinical teaching practice,and finding out the common characteristics between the orthopaedic chapters is primary for the theory.This research focuses on the following fields:fractures,nerve injury,infection,tumor and deformity.After the common characteristics between these chapters were analyzed and discussed,we concluded that the transfer theory is helpful in orthopaedic teaching practice,especially for students' comprehension and memory,but still we should avoid some negative effects in teaching process.

Cochlear Implantation ; adverse effects ; Female ; Humans ; Infant ; Meningitis ; etiology ; Postoperative Complications

Objective The forensic application of Lefort aqua regia digestion method detecting diatom in rabbits’s organs. Methods Using the Lefort aqua regia digestion-membrane ifltrition-SEM observation method and the traditional acid digestion-centrifugation-light microscopy observation method to detect diatom of drowning or postmortem immersion rabbits’s organs(lung,liver,kidney), and make statistical analysis of diatom number, consuming time, digestive capability and ifne structure of diatoms. Results The diatom number of Lefort aqua regia digestion method was superior to conventional acid digestion method, with the difference being statistically signiifcant (P<0.05), as well as consuming time, but have undifferentiated of drowning grounp(P>0.05), and have a better observation effect. Conclusion The Lefort aqua regia digestion method for diatom extraction was helpful for diatom identiifcation., and useful in drowning test by conventional and economicly.

Aim To evaluate the reversal effect of 2-deoxy-D-glucose ( 2-DG ) on multidrug resistance ( MDR) by observing the uptake change of 99m Tc-MIBI in HNE-1/DDP cells, and to explore its mechanism. Methods The uptake of 99m Tc-MIBI in HNE-1/DDP cells under different concentrations of 2-DG was detec-ted by γ-counter, and the clearance rates of 99m Tc-MI-BI in HNE-1 cells and HNE-1/DDP cells after treated with 2-DG (10 mmol·L-1 ) were compared. The con-tent of ATP in HNE-1/DDP cells was detected after treated with 2-DG. P-glycoprotein ( P-gp ) and multi-drug resistance-associated proteins ( MRP ) expression were measured by Western blot. Apoptotic HNE-1/DDP cells treated with DDP alone or combined with 2-DG (10 mmol·L-1 ) were detected by propidium io-dide ( PI ) staining. Results The clearance rate of 99m Tc-MIBI in HNE-1/DDP cells was 54. 8%, which was significantly higher than that ( - 41. 3%) in HNE-1 cells (P<0. 01). The clearance rate of 99mTc-MIBI in HNE-1/DDP cells was -203. 7% after treat-ment with 2-DG ( 10 mmol · L-1 ) , which could be significantly reduced compared with the control group ( P<0. 01 ) . The level of ATP was 55 . 69% compared with the negative control group and the expression of P-gp and MRP protein decreased dramatically in HNE-1/DDP. With the combination of 2-DG and DDP, the ap-optotic rate of HNE-1/DDP cells reached 49 . 4%which was significantly higher than DDP treated group (22. 5%) . Conclusion Multidrug resistance and the reversal effect of 2-DG on multidrug resistance could be evaluated effectively by detecting the uptake change of 99m Tc-MIBI in HNE-1/DDP cells. The mechanism may be related with the inhibition of ATP level and the re-duced expression of P-gp and MRP protein in cancer cells.

Objective To investigate the importance of elements of teaching aesthetic(appearance aesthetics; language aesthetics; emotion aesthetics; PPT aesthetics; blackboard-writing aesthetics and model aesthetics) in clinical orthopaedic teaching,and to analyze the reasons and significance of them.Methods Totally 137 medical students(2005 and 2006 grade) were investigated by the questionnaire in resent 2 years.They were asked to choose the first two important elements of teaching anesthetic from six elements displayed by four teachers.Results The percentage of appearance aesthetics,language aesthetics,emotion aesthetics,PPT aesthetics,blackboard-writing aesthetics and model aesthetics were showed as 97.4％,88.7％,67.1％,58.9％,13.6％ and 1.2％ respectively.Conclusion Teaching aesthetics is an indispensible part of teaching aesthetically and it is helpful to promote the teaching.We should be focus on PPT aesthetics and appearance aesthetics,which show high percentage in our research.

Objective To study the effects of shRNA-CtBP2 on the growth of prostate cancer PC3 cells. Methods There were three experimental groups in this study,which include blank control group, empty plasmid transfected group and transfected shRNA group. CtBP2 mRNA sequence is targeted by 3 pairs of designed interfering shRNA to built shRNA-Ct-BP2 recombinant plasmid then it is transfected into PC3 cells. Reverse transcriptase polymerase chain reaction (RT-PCR) and Western blot assays were used to detect the transcription and expression levels of CtBP2 mRNA and protein, respective-ly. PC3l proliferation was measured by MTT assay. Results Builting shRNA-CtBP2 recombinant plasmid and transfect-ing PC3 cells were successful. Transcription and expression levels of CtBP2 mRNA and protein were significantly decreased in shRNA-CtBP2 transfected PC3 cells. After CtBP2 silencing, cell proliferation was blocked in the shRNA-CtBP2 cells compared to that of blank control group (P<0.01). Conclusion shRNA-CtBP2 could significantly inhibit CtBP2 expres-sion, suppress the growth of PC3 cells, which suggests that CtBP2 may be a new target for PCa gene therapy.

Objective: To prepare the antibacterial peptides from Plutella xylostella-loaded nanoparticles based on poly(lactic-co- glycolic acid) (CA-PLGA-NPs) and evaluate its physicochemical property and in vitro release. Methods: CA-PLGA-NPs were prepared by S/W/O/W double emulsion method combined with high-pressure homogenization. The morphology, particle size, polydispersion index (PDI), drug loading, encapsulation efficiency (EE), and in vitro release of the nanoparticles were studied. Results: CA-PLGA-NPs were spherical or similarly spherical, and the average particle size, PDI, drug loading, and EE were (358.76 ± 22.51) nm, 0.168 1 ± 0.012 2, (10.50 ± 0.28)%, and (60.92 ± 1.58)%, respectively. And burst phenomenon was not significant. The drug delivery stable phase was 2-10 d. Conclusion: S/W/O/W double emulsion method combined with high pressure homogenization method is suitable for the preparation of CA-PLGA-NPs, and provides a pharmaceutical basis for CA administration.

Objective To investigate the Th1/Th2 polarization of T lymphocytes in human peripheral blood stimulated by CpG-ODN2216,and the secretion of cytokines in supernatant of cultured PBMCs after stimulation of CpG-ODN2216.Methods Human PBMCs were isolated from blood of donors.The PBMCs were incubated with CpG-ODN2216 for 24 hours.Th1/Th2 subsets in the cultured PBMCs were examined by flow cytometry,and IFN-?,IL-2,IL-4 and IL-10 in the supernatant were assayed by ELISA.Results The percentage of Th1 and Tc1 increased significantly after stimulation of CpG-ODN2216 compared with control group (P0.05).Conclusion The Th1 cells and Tc1 cells in T lymphocytes of peripheral blood could be polarizated by CpG-ODN 2216.IFN-? secretion in PBMCs could be induced by CpG-ODN2216.