Correlations between CTE features and clinical activity index of Crohn’s disease / 实用放射学杂志

Objective To evaluate correlations between CT features and clinical activity index of Crohn’s disease(CD).Methods The CTE datasets from 37 patients with moderate active,severe active and remission stages CD were retrospectively analyzed.To ob-serve imaging features of intestinal wall,parenteral and complications.And analyze whether there was an association between imaging findings and clinical activity.Results A total of 147 bowel segments in 37 cases were involved.Wall thickening (intestinal wall≥4 mm)were observed in 121 segments.An average thickness was (12.1±3.2)mm.There are 42 bowel segments of trilaminar mural stratifica-tion,71 of the double-layed stratification and 34 of non-stratification.Enlarged mesenteric lymph nodes were observed in 20 patients. Comb sign was observed in 27 patients.Higher density of surrounding fat appeared in 22 cases.The other 37 cases inluced 4 cases with abdominal abscess,7 cases with fistula,1 6 cases with intestinal obstruction or stenosis and 1 7 cases of perianal disease.The in-testinal stratification,wall thickening,comb sign,mesenteric fat density increased,abdominal abscess,intestinal stenosis and obstruc-tion were closely associated with clinical activity.Conclusion CTE images could provide information about intestinal wall,parenteral changes and complications of Crohn’s disease,and effectively help identifying remission and active stages of Crohn’s disease.

Influence of Medication on the Oscillatory and Dynamic Characteristics of Subthalamic Local Field Potentials in Patients with Parkinson's Disease / 生物医学工程学杂志

The dysfunction of subthalamic nucleus is the main cause of Parkinson's disease. Local field potentials in human subthalamic nucleus contain rich physiological information. The present study aimed to quantify the oscillatory and dynamic characteristics of local field potentials of subthalamic nucleus, and their modulation by the medication therapy for Parkinson's disease. The subthalamic nucleus local field potentials were recorded from patients with Parkinson's disease at the states of on and off medication. The oscillatory features were characterised with the power spectral analysis. Furthermore, the dynamic features were characterised with time-frequency analysis and the coefficient of variation measure of the time-variant power at each frequency. There was a dominant peak at low beta-band with medication off. The medication significantly suppressed the low beta component and increased the theta component. The amplitude fluctuation of neural oscillations was measured by the coefficient of variation. The coefficient of variation in 4-7 Hz and 60-66 Hz was increased by medication. These effects proved that medication had significant modulation to subthalamic nucleus neural oscillatory synchronization and dynamic features. The subthalamic nucleus neural activities tend towards stable state under medication. The findings would provide quantitative biomarkers for studying the mechanisms of Parkinson's disease and clinical treatments of medication or deep brain stimulation.

Different expression of miRNA-449 a in lung cancer and precancerous tissue / 基础医学与临床

Objective To investigate the expression and biological function of miRNA-449 a in lung cancer . Methods A case-control study was conducted in 58 patients diagnosed with lung cancer ( carcinoma and adeno-carcinoma) and normal tissue closely adjacent to tumor.MiRNA-449a simulation was designed and synthesized, was dissolved into two different concentrations as 10 and 20 mg/mL.The expression of miRNA-449a in lung cancer tissues and matched normal tissues were detected by Real time PCR .The expression of luciferase gene was detected by chemiluminescence technique.MiRNA-449a mimics on cell apoptosis was evaluated by MTT assay . Results The mean tissues expression levels of miRNA-449 a in squamous carcinoma group and adenocarcinoma group were 1.48 ±1.63 and 1.52 ±1.54 respectively, and were significantly lower than in control group (2.74 ± 1.55 ) ( P<0.01 ) .The average intensity of fluorescent protein in 10 mg/mL group and 20 mg/mL group were 2 115 ±168 and 1 352 ±159 respectively , and were significantly lower than that in control group ( 4 975 ±115 ) ( P<0.01 ) .Conclusions MiRNA-449 a was down-regulated expression in lung cancer and induced apoptosis .

Cross Frequency Coupling Characteristic Analysis in Subthalamic Local Field Potentials of Parkinson's Disease / 生物医学工程学杂志

Pathological neural activity in subthalamic nucleus (STN) is closely related to the symptoms of Parkinson' s disease. Local field potentials (LFPs) recordings from subthalamic nucleus show that power spectral peaks exist at tremor, double tremor and tripble tremor frequencies, respectively. The interaction between these components in the multi-frequency tremor may be related to the generation of tremor. To study the linear and nonlinear relationship between those components, we analyzed STN LFPs from 9 Parkinson's disease patients using time frequency, cross correlation, Granger casuality and bi-spectral analysis. Results of the time-frequency analysis and cross-frequency correlation analysis demonstrated that the power density of those components significantly decreased as the alleviation of tremor and cross-correlation (0.18-0.50) exists during tremor period. Granger causality of the time-variant amplitude showed stronger contribution from tremor to double tremor components, and contributions from both tremor and double tremor components to triple tremor component. Quadratic phase couplings among these three components were detected by the bispectral approaches. The linear and nonlinear relationships existed among the multi-components and certainly confirmed that the dependence cross those frequencies and neurological mechanism of tremor involved complicate neural processes.

siRNA-mediated CDK6 knockdown suppresses nasopharyngeal carcinoma cell growth and cell cycle transition in vitro / 南方医科大学学报

<p><b>OBJECTIVE</b>To assess the effect of small interfering RNA (siRNA)-mediated suppression of CDK6 expression on the proliferation and cell cycles of nasopharyngeal carcinoma (NPC) cells in vitro.</p><p><b>METHODS</b>QRT-PCR was used to examine the differential expression of CDK6 in 30 NPC tissues and 18 normal nasopharyngeal tissues. A siRNA targeting CDK6 was transfected in NPC CNE2 cells, and MTT assay and flow cytometry were used to analyze the changes in cell proliferation and cell cycle distribution. Western blotting was used to examine the expressions of the cell cycle-related factors.</p><p><b>RESULTS</b>Compared with normal nasopharyngeal tissues, NPC tissues showed an increased expression of CDK6 mRNA. Knocking down CDK6 expression obviously inhibited tumor cell growth and cell cycle transition from G1 to S phase and caused reduced expressions of CDK4, CCND1, and E2F1 and enhanced expression of the tumor suppressor p21.</p><p><b>CONCLUSION</b>NPC tissues overexpress CDK6. Knocking down CDK6 expression inhibits the growth and cell cycle transition of NPC cells in vitro by inhibiting the expressions of CDK4, CCND1, and E2F1 and upregulating tumor suppressor p21 expression.</p>

Protective Effects of Active Ingredients of Notoginseng on Immunological Liver Injury / 天津医药

Objective To investigate the protective effects of active components of notoginseng on immunological liver injury in mice. Methods Sixty Kunming mice were randomly divided into normal group (group A), model group (Group B), PNS group (Group C), total flavonoids group (Group D),and polysaccharide group (group E). C,D and E groups were given PNS, total flavonoids and polysaccharide orally, 1/day for 14 days. Then BCG was intravenous injected in B, C, D and E groups, and after 26 days lipopolysaccharide (LPS) was intravenous injected. Samples of eye venous plexus blood were collected, and serum levels of alanine aminotransferase (ALT), total superoxide dismutase (T-SOD) and Interleukin-4 (IL-4) were detected. Organs index was calculated by checking pathological results of liver, spleen and thymus. Results Com-pared with group B, the thymus index and serum ALT levels were significantly decreased in C, D and E groups (P<0.01), but the levels of IL-4 and T-SOD increased significantly (P<0.01). Pathological results showed that there were more serious inflammatory cell infiltration in liver, edema and necrosis of dot in C, D and E groups than those in group B. Conclusion The active components of notoginseng showed a significant protective effect on immunological liver injury.

Expression of CDK6 in nasopharyngeal carcinoma and its clinical significance / 南方医科大学学报

<p><b>OBJECTIVE</b>To explore the expression of CDK6 in nasopharyngeal carcinoma (NPC) and explore its clinical significance.</p><p><b>METHODS</b>Immunohistochemistry was used to examine the differential expression of CDK6 protein in 101 NPC and 30 nasopharyngeal tissues, and the correlation of CDK6 expression with the clinical characteristics was analyzed in NPC cases.</p><p><b>RESULTS</b>Immunohistochemistry demonstrated that CDK6 protein was a co-expressed factor in the cytoplasm and cell nuclei. CDK6 was expressed predominantly in the cytoplasm in nasopharyngeal tissues, but in NPC tissues, CDK6 was co-expressed predominantly in the cytoplasm and nuclei. Compared to the nasopharyngeal tissues, NPC tissues showed significantly up-regulated CDK6 expression (P=0.009) in positive correlation with tumor size (P=0.020) and clinical stages (P=0.0039).</p><p><b>CONCLUSIONS</b>Increased CDK6 protein expression is an unfavorable factor that promotes the development and progression of NPC.</p>