Genetic Diseases, Inborn ; Humans ; Liver Cirrhosis ; Polycystic Kidney Diseases

DNA Methylation ; Helicobacter Infections ; complications ; Helicobacter pylori ; Humans ; Stomach Neoplasms ; etiology ; genetics ; Telomerase ; physiology

Telomerase, as a factor of tumour's happening and development, is a kind of cell element not existing or with low activity in normal cells. Moreover, the activity of telomerase is a common channel for cell's immortalization and deterioration, and is also the main factor in cloning tumour and developing malignant turnour. Therefore, the tumour gene therapy focusing on telomerase has become the new target of present study of tumor.This therapy has greater prospects on clinical application than the past tumour gene therapy simply directing at one cancer gene.

The tight junction of intestinal epithelium plays an important role in maintaining the function of intestinal barrier and regulating the cell differentiation. The intestinal epithelial cells interact with neighboring cells and the extracellular matrix and then affect the epithelial barrier as well as the proliferation, polarization, and apoptosis of cells. As an important cell junction, the tight junction of intestinal epithelium participates in a series of signal transduction pathways including the classic cyclic adenosine monophosphate-protein kinase A-cyclic adenosine monophosphate response element-binding, inositol trisphosphate, Ras-mitogen-activated protein kinase, phosphatidylinositol 3-kinase, and in some special pathways including zonula occludents protein 1-associated Y-box factor,cyclin related protein, phosphorylation, and methylation. Furthermore, regulations of gene and protein expression of the tight junction are also complex, while disorders of such regulations may lead to clinical diseases, such as disruption of the intestinal barrier, refractory infection, and even cancers. This article reviews the research advances in gene expressions, related signal transduction, and self-regulation in the tight junction of intestinal epithelium.

Most deaths of breast cancer patients may be caused by the development of metastases. The latest research suggest that some miRNAs regulated gene expressions related with breast cancer metastasis at post-transcriptional level, which was closely related to invasion and metastasis of breast cancer. This review mainly dicussed the miRNA involved in regulation of invasion and metastasis of breast cancer and their mo-lecular mechanisms.

Objective To study the impact of accelerator's gantry angle on MLC position accuracy. Methods Kodak X-omat-V Films were used, appropriate multi-leaf collimator positions and gantry angles were chosen, precise setup was needed , and the exposal films were analyzed by RIT113 software. Results At all conditions, most of the leaf position errors were less than 0. 5 mm. There were 2 pairs of leaf position errors larger than 1 mm when the gantry angle was 270° and the leaves moved from left to right. Conclu-sions Gantry angle can affect the accuracy of multi-leaf collimator position. Gravity and inertia increase the uncertainty of leaf position accuracy. Prieise setup is critical for the dose measurement.

Objective To study the changes of ICAM-1 expression in transplanted lung at the early stage after rat pulmonary transplantation.Methods The expression level of ICAM-1 protein and its mRNA in rat transplanted lung after 4 h of ventilation and reperfussion were detected by using immunohisto chemical method(SABC method)and semiquantitative reverse transcriptase polymerase reaction method in the experimental group(n=6).When donor lungs had been flushed with low potassium solution(LPDS) and preserved in 4.C LPDS for 12 h,left orthotopic pulmonary transplantation was performed.In control group (n=6), left pulmonary artery,pulmonary vein and bronchi were fully freed to be naked.Immunohistochemical test results were recorded in negative(-),suspicion(±),faint positive(+),positive(++)and intensive positive(+++).PCR products were separated by agrose gels and the density of the bands were determined by density scanning.Results The stained color of alveolar epithelial cells and pulmonary vascular endothdial cells in the transplanted lung was significantly more intensive in experimental group than in control group(P＜0.01) and the relative density values(ICAM-1/βactin)were also significandy higher in experimental group(0.837±0.044) than in control group (0.442±0.037),P＜0.01. Conclusions ICAM-1 expression in the transplanted lung was up-regulated in the early stage after pulmonary transplantation,which was related with the enhancement of ICAM-1 mRNA.

The hTERT gene promoter is a tumor-specific promoter, regulated by a number of factors.Modulation of the chromatin structure via DNA methylation or histone acetylation plays an important role in regulating the hTERT promoter. Recent study also found that glycogen synthase kinase -3 cytokines, macrophage colony-stimulating factor receptor 1, bone inducing factor -7, transcription factors c-myc inhibitor, transforming growth factor β, cyclopentenone prostaglandin regulate the activity of hTERT through various pathways. Telomelysin, the telomerase-specific replication competent oncolytic adenovirus, has been used in clinical settings.Various gene therapies based on hTERT are current under-way.

Humans ; Neuroma, Acoustic ; surgery ; therapy

Objective To investigate the effects of unilateral and bilateral electrical stimulation of the upper and lower limbs on motor function following cerebral infarction and the expressions of microtubule-associated protein-2 (MAP-2) and survivin in the infarction border zone of rats. Methods Adult male Sprague-Dawley (SD) rats were randomly divided into sham operation, control, impaired limb and bilateral limbs electrical stimulation groups (each group included 32 rats). Acute cerebral infarction was mimicked using a middle cerebral artery occlusion tech-nique. After cerebral infarction for 24 h, the rats were treated daily with or without electrical stimulation. A beam walking test (BWT) was used to measure limbs motor function and immunohistochemistry and HE staining were used to detect the expressions of MAP-2 and survivin in the border zone of infarcted area after electrical stimulation treat-ment for 3, 7, 14 and 21 d. Results Comparet with the control group treatment with electric stimulation led to BWT scores increasing significantly, and bilateral stimulation was more potent in ameliorating motor function thanstimulating the impaired limb only. The expression of MAP-2 was significantly higher in eleetrieal stimulation groups than in control group from the 7th of treatment, and it was higher in bilateral stimulation group than that in unilateral stimulation group from tbe 14th day of treatment. There was no significant difference in MAP-2 expression between bi-lateral stimulation group and sham operation group at the 21st day of treatment. In electrical stimulation groups, at every time point the expressions of survivin were obviously higher than that in sham operation group, and it was higher than that in control group and peaked at the 7tb and 14th day of treatment and in bilateral stimulation group it was no-tably higher than that in unilateral stimulation group. At the 21st d of treatment the level of survivin expression drop-per; however, there was no significant difference between unilateral and bilateral electrical stimulation groups. Con-clusions Treatment with electrical stimulation, particularly in bilateral limbs stimulation, could induce MAP-2 and survivin expressions in the infarction border zone of rats. It also could promote the recovery of motor function in para-lyzed limbs after cerebral infarction of rats. The improvement might involve the up-regulation of MAP-2 and survivin expressions.