Objective To study the molecular mechanism of medulloblastoma.Methods The cell line with PARP-1 and P53 null mutation was established and characterized.Mouse medulloblastoma cell line derived from PARP-1/P53 double knockout mice was established.We analyzed cell characters after 30 passages,using neuronal cell-specific markers by immunofluorescence.The cells were transfected with pEGFP-C1-Hparp-1 and pEGFP-C1 plasmids,the expression of PARP-1 protein was detected by immunofluorescence stainning and Western blot.Results The cells showed positive immunoactivity for the neuronal-specific markers such as Vimentin,Dcx and ?Ⅲ-Tubulin,and cells were negative for PARP-1 protein.Exogenous PARP-1 expression was visualized by immunofluorescence and Western blot analysis after pEGFP-C1-Hparp-1 transfection.Conclusion Mouse medulloblastoma cell line with defective function for DNA damage recovery has been successfully established,which provides a useful tool for further dissecting the molecular mechanism and pathogenesis of medulloblastoma.

Objective To evaluate the methods and the factors of affecting imaging quality of 3D CE MRA of carotid arteries.Methods 3D CE MRA in 48 patients were performed using 1.5T super conductive MR scanner,cervical and lumbar combination phased array coils. All patients were examined using intravenous injection Gd-DTPA and breath-hold 3D FLASH sequence. Results Imaging quality was satisfied in 46/48 patients (96%). MIP and MPR could clearly showed normal anatomy. The site,size and stenosis degree of the lesion were also demonstrated. Compared to surgery,DSA and/or ultrasound results , in 23 patients, the sensitivity and specificity of 3D CE MRA were 100% and 100% respeectively for the lesion of carotid arteries. Conclusion High quality images of 3D CE MRA mainly depends on determining the best acquisition delay time,optimizing injection volume and rate of contrast material,using reasonable sequence parameters and skilled level of operators.

Objective To investigate the relationship between nonalcoholic fatty liver disease (NAFLD) and benign prostatic hyperplasia (BPH) in elderly patients.Methods 50 elderly BPH men with NAFLD were enrolled in this study,while 30 age-matched BPH men without NAFLD were selected as the control group.Prostate volume (PV),body mass index (BMI),triglycerides (TG),fasting blood glucose (FBG),fasting plasma insulin (FINS) and homeostasis model of assessment for insulin resistanceindex (HOMA-IR) were compared between the two groups,and correlations of PV with FINS and HOMA-IR were analyzed in the NAFLD patients.Results The PV level was significantly higher in NAFLD patients than in control group [(48.2±16.3) ml vs.(33.2± 11.5) ml,P＜0.01].The incidence of severe BPH was higher in NAFLD group than in control group (42.2％ vs.13.3％,P＜0.05).BMI,TG,FBG,FINS and HOMA IR were higher in NAFLD group than in the control group (all P＜0.01).The PV was positively correlated with FINS and HOMA-IR levels in elderly NAFLD patients (r=0.814,0.601,respectively,both P＜ 0.01).Conclusions NAFLD is closely associated with BPH in elderly males,and NAFLD may be one of the risk factors for BPH.

Objective To assess the role of MR myocardial perfusion imaging (MRMPI) in detecting the viabilitive of myocardium in patient with old myocardial infarction (OMI) Methods MRMPI was performed in 47 patients suffering from old myocardial infarction with 1 5 T MR scanner Male 44, female 3, age ranged from 30 to 87 years with a mean of 61 years All patients were imaged during the first pass and delayed phase 5-30 min after injection of Gd DTPA 0 1 mmol/kg at 5 ml/s using IR turbo FLASH sequence Short axis images were acquired during the first pass, and both short axis and long axis images during delayed phase The left ventricular wall on short axis slice was divided into 8 segments A correlative study was carried out in 17 patients with the results of rest and stress 99m Tc SPECT scanning Results In 47 patients of old myocardial infarction, 29(61 7%) showed hypoenhancement during the first pass imaging (the SI was 50 20?7 45 percent of normal segment)and 46(97 9%) revealed delayed hyperenhancement(the SI was 491 0?197 26 percent of normal segment). For delayed hyperenhancement, 10(21 3%) was transmural ,15(31 9%) was nontransmural, and 21(44 7%) mixed, another one was normal 37 segments in 17 patients revealed to be nonviable by rest and stress 99m Tc SPECT, and the MRMPI all showed delayed hyperenhancement 116 viable segments on rest and stress 99m Tc SPECT, and no delayed hyperenhancement in 97 segments (83 6%) on MRMPI With the rest and stress 99m Tc SPECT as a standard of reference the sensitivity and the specificity of MRMPI were 100.0% and 83 6% respectively Conclusion The myocardial viability and nonviability as well as their severity and extent may be effectively evaluated with MRMPI in patients with OMI

Objective To explore the energy feature of the spontaneous neural activity in depressive patients with diurnal rhythm.Methods Twenty depressive patients with diurnal rhythm,20 depressive patients without diurnal rhythm and 20 gender-,age-,education-matched healthy controls were scanned with 3.0 T MRI Scanner.According to Results of ANOVA,group-wise two sample t-test was completed.The correlation analysis were conducted between ALFF of significant difference brain regions and the score of Hamilton rating scale for depression.Results The brain regions showing significant differences among three groups were located in the right parahippocampal gyrus(MNI:18,-36,-9;K=136),left parietal lobe(MNI:-54,-45,42;K=86),left cerebellum crus(MNI:-84,-60,36;K=86) and right cerebellum crus(MNI:9,-78,-36;K=91)(P<0.05,Alphasim correct).Compared with non-diurnal rhythm group,the diurnal rhythm group showed significantly increased ALFF in the right parahippocampal gyrus.Compared with healthy group,the diurnal rhythm group showed significantly increased ALFF in right parahippocampal gyrus,left parietal lobe,and significantly decreased ALFF in left cerebellum crus 1 and right cerebellum crus 2.Compared with healthy group,the non-diurnal rhythm group showed significantly increased ALFF in left parietal lobe,and significantly decreased ALFF in left cerebellum crus 1 and bilateral cerebellum crus 2.No correlation between ALFF of significant difference brain regions and clinical symptoms was found(P>0.05).Conclusion The diurnal rhythm observed in depression may be associated with aberrant activity of parahippocampal gyrus.

Objective To discuss the medication regularity of prescriptions containing Asini Corii Colla;To provide data support for clinical compatibility application of Asini Corii Colla.Methods Totally 2635 articles about prescriptions containing Asini Corii Colla were retrieved from CNKI from Jan. 1995 to Dec. 2012. TCM Inheritance Support System V2.0 was employed to conduct frequency analysis and association rules analysis, with a purpose to determine the frequency, indications of disease, indications of syndrome and medicine core combination of common prescriptions containing Asini Corii Colla.Results The 2635 prescriptions containing Asini Corii Colla involved 1197 Chinese herbal medicines, 34 kinds of which were used in extremely high frequency (frequency>200). 30 kinds of indications of disease were treated in the high frequency (frequency>20). 32 kinds of indications of syndrome were treated in the high frequency (frequency>20). The combination of Glycyrrhizae Radix et Rhizoma, Angelicae Sinensis Radix and Asini Corii Colla showed the highest frequency in all three herbal combinations (486 times), and Atractylodix Macrocephalae Rhizoma, Asini Corii Colla, Codonopsis Radix and Astragali Radix showed the highest frequency in all four herbal combinations (272 times).Conclusion Most of compatibility them can enrich blood and tonify qi, and have major functions for gynecological diseases and major syndromes of qi-blood deficiency.

Objective To prospectively evaluate the feasibility and reliablity of low kilovoltage contrast-enhanced multi-slice CT(MSCT)to detect the myocardial viability in chronic myocardial infarcetion.with comparison to magnetic resonance(MR)myocardial perfusion and viability imaging.Methods Thirty-two patients with clinical diagnosed chronic myocardial infarction underwent the first pass and delayenhanced myocardial imaging with 64-slice MSCT and MR Left ventricle was divided into 16 segments.MSCT and MR images of all the patients were blindly analyzed.The size and extent of hypoenhanced regions in first pass phase and hyperenhanced regions in delayed phase were define.The Kappa test was used to assess the ability of identifying the viable myocardium between the two methods.Results In 32 patients with chronic myocardial infarction,MSCT showed hypoenhanced regions in 41 segments and normal in 471 segments during the first phase,while MRI revealed hypoenhanced regions in 47 segments and normal regions in 465 segments.The Kappa value was 0.650 and the concordance rate of the two techniques was 94.5%(484/512).MSCT showed 135 hyperenhanced regions which were non-transmural in 50 segments and transmural in 85 segments.And the other 377 normal segments showed no enhancement in the delayed phase.MRI revealed 120 hyperenhanced regions which were non-transmural in 56 segments and transmural in 64 segments.And the other 392 normal segments showed no enhancement in the delayed phase.The Kappa value of the two techniques was 0.609 and the concordance rate of the two techniques was 80.7% (413/512).Conclusion The study showed that low kilovolrage CE MSCT has a good concordance with MRI and has high feasibility and reliability in evaluating the myocardial viability in chronic myocardial infarction.The radiation dose is still the important aspect of MSCT application.

Objective To evaluate low-dose CT coronary angiography with prospective electrocardiogram (ECG)-triggering using dual-source CT scanner.Methods Sixty-eight patients who underwent coronary CT angiography using a dual-source CT scanner were divided into 2 groups: group A (38 cases) and group B (30 cases).Prospective ECG-triggering sequence scan mode was employed for group A.Inclusion criteria included: heart rate <70 bpm, sinus rhythm, and heart rate fluctuation less than 10 bpm.Data acquisition was set at 70% of the RR-interval.Retrospective ECG-gating helical scan was performed for group B.Inclusion criteria included heart rates < 70 bpm and sinus rhythm.The exclusion criteria included heart failure and serious arrhythmias.In both groups, patients with a BMI≥24 kg/m2 were examined with a tube voltage of 120 kV, whereas patients with a BMI <24 kg/m2 were examined with a tube voltage of 100 kV.All images were transferred to a workstation for further processing and analysis.The imaging quality was evaluated.The imaging quality of coronary artery segments were compared with rank sum test between the two groups, and the radiation dose were compared with t test.Results A total of 476 coronary artery segments were evaluated in group A and 372 segments were evaluated in group B.The mean score of imaging quality for coronary artery segments in group A was 3.48±0.59 and that in group B was 3.53±0.58.There was no statistical difference in imaging quality between the two groups (Z=-1.432, P=0.187).The effective dose was on average (2.51±0.54) mSv (range 1.3--3.3 mSv) in group A, whereas on average (14.55±3.54) rosy (range 7.1--20.2 mSv) in group B.There was a statistical difference between the two groups (t=18.484, P=0.000).Conclusions Low-dose prospective ECG-triggering sequence scan in dual-source CT coronary angiography is feasible in patients with low heart rate and regular cardiac rhythm.This scan mode can substantially reduce radiation doses while preserving good diagnostic image quality.

Objective To prospectively evaluate the influence of average heart rate,heart rate variability and ECG editing on image quality of 64-slice CT coronary angiography(CTCA)in patients with atrial fibrillation(AF).Methods Fifty patients who were diagnosed with AF underwent respective ECG-gating 64-slice CTCA Image quality(good,moderate,poor)were evaluated on vessel segment level pre-and post ECG editing.Chi-square test was performed to compare the image quality in patients with various average heart rate,heart rate variability,and pre-and post ECC editing.Pearson correlation analysis was performed to test the relationship between the image quality and average heart rate and heart rate variability.Sensitivity,specificity,positive predictive value(PPV)and negative predictive value(NPV)were calculated by using the conventional angiography as the standard reference.Results The average heart rate of the fifty AF patients was(89±23)beat/min,with variability of(18.2±6.1)beat/min.Finally,24(3.4%)segments were considered to have poor image quality in 6(12.0%)patients.Image quality decreased significantly(P＜0.05)at the average heart rate of over 100 beats per minute(11 segments)or the standard deviation of heart rate of over 24 beats per minute(11 segments).There was significant correlation between the mean heart rate and the image quality for all segments,the RCA,and distal section of coronary artery(r=0.50,0.55,0.53,0.49,0.42,0.44;P＜0.05).Heart rate variability was also significant correlated with the image quality.There was significant difference on image quality pre-and post ECG editing(P=0.013).The respective overall sensitivity,specificity,NPV,PPV values were 100%(6/6),93.2%(41/44),100%(41/41),and 66.7%(6/9).Conclusion ECG editing can improve the success rate and the image quality of 64-slice CTCA effectively in patients with AF within a certain range of average heart rates and heart rate variability.

Objective To investigate the application of low-dose adaptive sequence scan of dual-source CT coronary angiography in patients with high heart rate and evaluate the image quality.Methods Seventy-two patients who underwent coronary CT angiography with heart rate> 70 bpm were divided into 2 groups.Group A was adaptive sequence scan, and Group B was retrospective ECG-gating helical scan.Examinations were performed on a dual-source CT scanner (Somatom Definition) .All images were transferred to a workstation for further processing and analysis.The image quality was evaluated using same criteria.The image quality of coronary artery segments was compared in two groups using rank sum test, and the radiation dose was compared using t test Results A total of 501 coronary artery segments were evaluated in group A and 400 segments in group B.The mean ranks in image quality of coronary artery segments in group A was 475.42, whereas 420.41 in group B.There was a statistical difference in image quality between the two groups (Z= - 3.509,P=0.000).The effective dose was on average (6.2±0.9) mSv in group A, whereas on average (14.7±1.9) mSv in group B, there was a statistical difference between the two groups(t= - 27.011, P=0.000).Conclusions Adaptive sequence scan in dual-source CT coronary angiography is feasible in patients with high heart rates.This scan mode can substantially reduce radiation dose and maintain the diagnostic image quality.