Intracranial arterial stenosis is the most common vascular lesions in patients with acute stroke in Chinese population,and most of them are middle cerebral artery (MCA) stenosis.The treatment of asymptomatic MCA stenosis is mainly to control the risk factors and treat with drugs,and the prognosis is better.Statins can reduce new stroke events.The treatment programs of symptomatic MCA stenosis are mainly to control the risk factors,treat with drugs and stenting.Now it is considered that anticoagulants are not superior to antiplatelet drugs in the treatment of MCA stenosis,but whether dual antiplatelet drugs are superior to monotherapy and stenting remains to be determined.The prognosis of symptomatic MCA stenosis is poor.The prognosis of acute phase mainly depends upon imaging features,and the risk of recurrent stroke is primarily associated with the MCA stenosis.Future research should focus on whether dual antiplatelet therapy is superior to monotherapy,and whether stenting is superior to drug treatment,as well as the relationship between the degree of MCA stenosis and prognosis of acute phase or the risk of recurrent stroke.

Objective To study the chronic neurotoxicity of aluminum through observing the adverse effect of long term intake of aluminum on the memory of rats.Methods 40 Wistar rats were randomly divided into 4 groups and given Al2(SO4)3 through drinking water for 6 months,the concentration of Al3+ in the waters were 0.12 mg/L,40 mg/L,400 mg/L and 2 000 mg/L respectively,then passive avoidance tests were carried out.One month before pregnancy,the dams were given Al3+ of 40 mg/L and 2 000 mg/L respectively,after the offspring were born,the group given high[Al3+] was subdivided into two groups,one continuously drank the water with high [Al3+],the other drank the water without Al3+.The dams drinking water with low [Al3+] and their offspring continued to drink the same water as before.At the age of three months,all the offspring were examined with passive avoidance tests.Results The memory acquirement in all adult rats were not abnormal,but memory retention were severely damaged (P0.05).The rats continuously drinking water with high [Al3+] after birth had significant damage both in memory acquirement and in retention (P

Objective To compare the difference of entrance dose between CR and amorphous silocon DR system in chest imaging, and to discuss their optimum exposure dose. Methods For CR and DR, different entrance dose was measured by dosimeter in chest phantom. The value of IQFinv was analyzed by CDRAD2. 0 software. Image quality difference between CR and DR was assessed by group t-test. The relationship between image quality and entrance dose was tested by using Pearson correlation analysis. The best IQFinv values in CR and DR system were achieved via ROC curve analysis, and the exposure dose was then calculated. Results There were direct correlation values between entrance dose and the value of IQFinv in CR and DR system, respectively( r =0. 893 ,0. 848 ,P < 0. 01 ) . The linear regression equation for DR was IQFinv =0. 0050 +3. 359, and for CR was IQFinv =0. 005D + I. 651 , where D was entrance dose. The difference of IQFinv value between CR and DR was significant(t = 5. 455 ,P < 0. 05). The best IQFinv value of the two groups from ROC analysis was 3.55. Conclusions With the entrance dose increased, the detection ability of contrast-detail was elevated in the two digital radiography systems. With equal entrance dose, the detection ability of DR in contrast-detail was superior to CR. With equal image quality, DR obviously decreased the radiation dose to the patients.

Objective To study on the effect of DNA vaccine, p(Aβ3-10) 10-mIL-4, immunization on behavior and brain Aβ deposition in APP/PS1 transgenic mice.Methods DNA vaccine p(Aβ3-10) 10-mIL-4 was constructed which expressed fusion protein of ten tandem repeats of Aβ3-10 and mouse IL-4.APP/PS1 transgenic mice were vaccinated with p (Aβ3-10) 10-mIL-4.Aβ42 peptide and pcDNA3.1 (+) were injected to the control groups.Anti-Aβ antibody titers were detected before and after vaccination by enzyme-linked immunosorbent assay (ELISA) ,the spatial learning and memory ability of the mice were evaluated by Morris water maze.The senile plaques in mouse brains were detected by immunohistochemistry.Results Compare with pcDNA3.1 (+) group,immunization with the vaccine p (Aβ3-10) 10-mIL-4 in APP/PS1 mice induced high-titer Anti-Aβ antibodies ((27.49±4.51) μg/ml, P＜0.01) ,decreased Aβ deposition (reduced senile plaque number in the cortex and hippocampus by 52.86％ and 58.29％ respectively, P＜0.01) and improved their cognitive ability.Conclusions The immunization with p(Aβ3-10)10-mIL-4 in APP/PS1 mice achieve an ideal effect of vaccination, and p(Aβ3-10) 10-mIL-4 can be an alternative Alzheimer's disease vaccine to further study.

Objective To explore the relationship between apathy and lesion location and serum homocysteine during the acute stage of ischemic stroke. Methods 152 patients with acute cerebral infarction were recruited. 152 volunteers from medical center were as control group. The Apathy Scale (AS) was used to assess poststroke apathy (PSA). National Institutes of Health Stroke Scale (NIHSS) was used to assess the severity of stroke. Magnetic resonance imaging (MRI) with diffusion-weighted imaging (DWI) was used to evaluate the lesion location. Modified Fazekas Scale was used to assess leukoaraiosis. The serum levels of homocysteine of patients were determined. Results The prevalence of PSA was significantly higher in the patients than in the control group (P<0.001). Multivariate logistic regression demonstrated that frontal lesion (P=0.001), basal ganglia lesion (P=0.006), pons lesion (P=0.002) and higher homocysteine level (P<0.001) significantly related with PSA. Conclusion Frontal lesion, basal ganglia lesion, pons lesion and higher homocysteine level may be predictors for apathy in acute stage of ischemic stroke.

Objective:To investigate the efficacy of single time intra-articular different concentration of allogeneic bone marrow mesenchymal stem cells ( BM-MSCs ) injection in the treatment of Sprague-Dawley ( SD) rat model of osteoarthritis ( OA) .Methods: In the study, 32 SD rats were equally ran-domized into 4 groups:control group, high concentration group (1 ×107/mL BM-MSCs), low concentra-tion group (5 ×106/mL BM-MSCs) and high vs.low concentration group.The two knees of each rat were set up to a pair.The induction of OA was performed surgically randomly at one side in model group, and bilaterally in the other groups, which were through anterior cruciate ligament transaction ( ACLT) and medial meniscus excising.After the operation, the SD rats were allowed free movement.Four weeks later, different concentrations of allogeneic BM-MSCs isolated from the SD rats, expanded in vitro and suspended in phosphate buffered solution( PBS) were delivered in the articular cavity of both knees;PBS was used as the control.After injection, we excised the femoral nerve and sciatic nerve to disuse the low limb.The cartilage histological sections of knees were scored by Mankin scoring system to assess the se-verity of the pathology.mRNA of collagen Ⅱwas detected by real time polymerase chain reaction ( RT-PCR) .eGFP was detected by fluorescence microscope.Assessments were carried out 4 weeks after the operation in model group, and 3 weeks after injection in the other groups.Results:Mankin scores of the BM-MSCs side and control side were 6.60 ±0.40 vs.10.00 ±0.32 in low concentration group ( P<0.05), and 5.40 ±0.51 vs.9.60 ±0.51 in high concentration group (P<0.05).Mankin scores of high sv.low concentration group were 6.40 ±0.51 vs.7.60 ±0.75 (P>0.05).mRNA expression of collagen Ⅱ of the BM-MSCs side in low concentration group was 106%±1%in contrast to the control side.As in high concentration group it was 108%±1%, and 102%±1%in high vs. low concentra-tion group.Labeled BM-MSCs were detected unexpectedly in the synovial membrane but not in cartilage tissue three weeks from injection.Conclusion:BM-MSCs could promote cartilage repair and inhibit OA progression through a trophic mechanism.There was no difference between the two concentrations.

Objective To construct the eukaryotic expression plasmid of the rabies virus glycoprotein gene DNA,and detect the immunogenicity.Methods Using RT-PCR amplified the glycoprotein gene of rabies virus CTN strain,sequenced and cloned into pcDNA5.0 (+) vector to construct the recombinant plasmid pcDNA5.0-G plasmid.Detect glycoprotein transient expression with transfecting the plasmid into 293T cells.Intramuscular immunization of BALB/c mice by the recombinant plasmid on day 0 and 7,then challenge by rabies virus CVS strain observed the mice survived.Results The results of the transient expression of glycoprotein abundantly expressed.The survival ratio of mice with CVS challenge after routine intramuscular injection of pcDNA5.0-G plasmid is 73.3％,and 6.7％ for the control group.Conclusion Rabies virus glycoprotein eukaryotic expression plasmid pcDNA5.0-G was successfully constructed,and has been good immunogenicity.It's to be the foundation for candidate DNA vaccine research and development.

Objective To prepare a neutralizing monoclonal antibody against rabies virus. Meth-ods BALB/c mice were immunized with the inactivated rabies virus CTN strains on day 0, 7, 14 and 28. Spleen cell samples were collected and then fused with SP2/0 cells to prepare the hybridoma cell line. Posi-tive hybridoma cells that were screened out with RFFIT technique were injected into BALB/c mice intraper-itoneally. Ascites samples were collected from the mice to separate neutralizing monoclonal antibodies. Affin-ity chromatography was used for the purification of neutralizing monoclonal antibodies. Subtype identification and sequencing analysis were performed for further identification. A colloidal gold strip based method for rap-id detection of rabies vaccine was established with the prepared monoclonal antibodies. Results The hybri-doma cell line, CTN-McAb1, was prepared successfully with stable secretion of neutralizing monoclonal anti-bodies against rabies virus. The purity of those antibodies was more than 95% after purification and the sub-type of them was IgG1. The colloidal gold strip for raid detection of rabies vaccine was successful prepared. Conclusion The neutralizing monoclonal antibody against rabies virus was successfully prepared and could be used for preliminary application. This study will be of great significance for the quality control of rabies vaccine.

Objective To express and purify the glycoprotein extracellular domain (Ex-GP) of Rabies virus strain CTN in soluble form with high efficiency.Methods A recombinant expression plasmid containing the gene encoding the Ex-GP was constructed.Various expression conditions were screened to obtain an optimum prokaryotic expression system for Ex-GP in soluble form.The expressed target protein was purified using affinity chromatography and gel filtration chromatography.Results The target protein Ex-GP with high antigenicity was efficiently expressed in soluble form by using the recombinant PBCX expression system and effectively purified by using affinity and gel filtration chromatography.Conclusion The soluble form of Ex-GP is successfully expressed and purified in a simple and convenient way.This study paves the way for further researches on the biological functions of rabies virus glycoprotein,the pathogenic mechanism of rabies and the development of diagnostic reagent and vaccines for rabies virus.