Objective To find out the correlation among the genes which were screened by high density genechips related to mice optic nerve development and injury in our previous work,then to estimate the functions of some unknown genes according to some genes known related to CNS neurite extention and guidance.Methods Hierarchical clustering method was applied for the genes mentioned above and the subgroups respectively containing Ptn,Efnb3 were further analyzed.Results A total of 1 033 suitable candidate genes were clustered into 6 groups.The gene expression pattern of group B was identical to the development pattern of lateral geniculate body(LGN),which supposed that the genes of group B might be the key genes to the optic never development.Five functionally unknown genes Mm.28443,Mm.9671,Mm.25504,Mm.160640,Mm.182895 were clustered into a subgroup together with Ptn.The Pearson's coefficient between each of them and Ptn varied from 0.979 to 0.996.These genes were supposed to be candidate genes related to neurite growth and guidance.Lamr1 and its ligand were assumed to be the neurite guiding molecules for optic never,both beacuse of its high Coefficient to Efnb3 gene and related documents.Conclusion New neurite guiding molecules might be potential target genes for CNS regeneration by genetic engineering.

Hypoxia inducible factor-1α(HIF-1α) is usually highly expressed in tumor cells,and can promote tumor growth.HIF-1α is correlated with tumor condition,the diagnosis and the prognosis.Therefore,HIF-1α can be used for tumor treatment in the level of transcriprion,pro-transcriprion and target.It is possible to improve the treatment efficiency,and to lengthen patients lifespan.

Hepatocyte transplantation is effective in the treatment of liver failure caused by a variety of factors.In pace with the progress of the study of induced pluripotent stem cells and its differentiation technology,a new method has arisen to obtain a great number of safe hepatocytes with biological function,which are suitable for seed cells of hepatocyte transplantation.In this article,we review the latest research progress about induced pluripotent stem cell-derived hepatocytes being transplanted to treat liver failure.

Objective To detect the expression changes and location of the mouse developmental regulation brain protein(Dbn1)in the developmental mouse brain.Methods Monoclonal antibodies against drebrin protein were used to assess Dbn1 by immunohistochemistry and Western blot.The paternal expression of Dbn1 in developmental mouse brain(E14,P1,P7 and adult)was initially investigated by Western blot.Dbn1 was shown at various developmental stages(E14,P1 and P7)as well as in adult in different brain area of developmental mouse brain by immunohistochemical.Results Dbn1 protein was detected in developmental brain but a little in adult brain by Western blot,high at E14,decreased at P1,gradually increased at P7 and lowest in adult.Immunohistochemistry confirmed as follows:Dbn1 expressed mostly in cortex,hippocampus and ependyma areas at E14,and the positive signal was distributed at cells border;The expression of Dbn1 was decreased at P1,mainly distributed at the verge of cells or dendrites;The peak expression of Dbn1 appeared at P7,Dbn1 located at nucleus of hippocampus and cortex,and the positive signal located within cytoplasm and dendrites;Only a little positive Dbn1 cells were found in adult mouse brain.Conclusion Dnb1 may be involved in regulating the differentiation and migration of neurons during the development of mouse brain.

Objective　To investigate the mechanism affecting on permeability of vascular endothelial cell by nitric oxide (NO). Methods　Series concentration of sin-1（a donor of NO） were added to ECV 304, a cell line of human umbilical vein endothelium. Cell growth and expression of f-actin, a cytoskeleton protein were observed. Results　Cell growth was inhibited with a dose from 6.25 to 100 μmol/L and was caused to death at the concentration of 50 to 100 μmol/L by sin-1. The expression of f-actin was suppressed obviously after cultured with 100 μmol/L sin-1 for 4 hours. Conclusion　It suggests that anomaly increased NO can increase permeability of blood vessels by suppressing the expression of f-actin, inhibiting cell growth or even resulting in cell death.

Angiogenesis plays an important role in the development process of tumor,and related microRNA(miRNA) in tumor cells can regulate tumor angiogenesis via the pathway of vascular endothelial growth factor(VEGF).Therefore,the further study of miRNA function will provide more effective targets to inhibit tumor angiogenesis,and provide more reliable basis for the clinical diagnosis and treatment of tumor.

It is important and necessary for the teaching process in histology and embryology integrated by psychological quality.The psychological quality of teachers can be improved by professional training and by themselves.Teachers should teach everyone differently according to the different psychological character of medical students who are born after 1990.Teachers can improve psychological quality of medical students in teaching process including the discussion,visiting the embryo sample and the second class.

Objective To detect the expression of BAT2L protein in developmental brain of rats.Methods Expression,distribution and location of BAT2L protein in developmental brain rats on embryonic day 18,postnatal days 1,7 and 15 and in adult at different time points were detected by Western blotting analysis,immunohistochemistry and immunofluorescence,respectively.Results Western blotting showed that the BAT2L protein expression level was higher in brain of rats on embryonic day 18,postnatal days 1 and 7 than on postnatal day 15 and in brain of adult rats.Immunohistochemistry and immunofluorescence showed that the BAT2L protein was distributed and located in cell membrane and cytoplasm of neurons but not in nuclei and extra-cellular space.Positive neurons were widely distributed in cerebral and cerebellar cortex,hippocampus and cerebral ganglion.The morphology of neurons was significantly different in newborn and adult rats.Positive prominences and branches of certain neurons were found in brain tissues of newborn rats but hardly in those of adult rats.Conclusion BAT2L protein is specifically expressed in cell body,membrane and prominence of neurons in brain of rats.

Objective To study the effects of PHLDA2 overexpression on radiosensitivity and the underlying mechanisms in human osteosarcoma U2OS cell line.Methods To obtain the subclone,cells were exposed to G418 persistently after transfection of pEGFP-C3-PHLDA2 vector into U2OS cells.Three groups of blank control (U2OS),negative control (U2OS-neo) and transfected group (U2OS-PHLDA2) were used.The expression of PHLDA2 in the subclone cells was determined by Western blot.After exposure to X-ray irradiation,cellular growth activity and survival were detected by CKK-8 assay and colony formation assay,respectively.The cell apoptosis was measured by the Annexin V/PI staining,and the apoptotic protein was analyzed by Western blot.The in-vivo effects of PHLDA2 on irradiation were evaluated by xenografts.Results Compared with U2OS group and U2OS-neogroup,the sabclone cells were successfully obtained by G418 selection,in which the expression of PHLDA2 was upregulated(t =13.73,16.28,P ＜ 0.05).In vitro,PHLDA2 overexpression significantly enhanced the response to radiation in U2OS cells with a reduction of colony survival and proliferation with the increase of doses (t =5.00-8.23,P ＜0.05;t =-2.52--1.26,P ＜ 0.05).In vivo,PHLDA2-upregulated xenografts had more radiosensitivity than control groups with a significant inhibition of tumor growth (t =3.27,2.91,P ＜ 0.05).After 8 Gy irradiation,the apoptosis was significantly increased (t =10.11,9.61,P ＜ 0.05),accompanied with the activation of Caspased-3 in U2OS-PHLDA2 cells,which was presented by upregulation of cleaved Caspase-3 (t =11.26,10.72,P ＜ 0.05).Conclusions Exogenetic expression of PHLDA2 could significantly enhance the radiosensitivity of human osteosarcoma cells,which may be attributed to the activation of Caspase-3 that increases irradiation-induced apoptosis.

Neuron axonal signals play an important role in myelination of central nervous system. Myelination depends on a balance between the positive and negative neuron axonal signals. The positive signals, such as neuregulins (NRG), neuron cell adhesion molecule (NCAM), electrical activity and neurotrophins, have a function of promoting the proliferation and the myelination thickness of ensheathing glial cells, while the negative factors like the L1 protein, poly-sialic acid-neuron cell adhesion molecule (PSA-NCAM), will lead a marked decrease in myelination. Here，we mainly present some well-researched neuron axonal factors and their mechanism.