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Objective To investigate the effects of propefol on β-amyloid protein(β-AP)-induced injury to cultured rat cortical neurons.Methods Eighteen days pregnant SD rats were anesthetized with ether.The fetal rats were obtained under sterile condition and decapitated. Cortices were then dissected under dissecting microscope.Cortical neurons were isolated according to the method described by Velly LJ et al and cultured for 7 days.There were 5×104 neurons in each well (200 μl).The experiment included 2 parts.In part T 15 wells of neurons were randomly divided into 5 groups(n=3 each ) : group I control(C);group II β-AP 25 μmol/L; group III and IV 2 propofol pretreatment groups (PP1,PP2) and greup V propofol treatment (PT).In group PPt propofol 50 μmol/L was added to the culture medium 24 h before the addition of β-AP 25 μmol/L and the neurons were incubated for another 24 h.In group PP2 propofol 50 μmol/L and μ-AP 25 μmol/L were added to the culture medium simultaneously and the neurons were then incubated for 24 h.In group PT propefol 50 μmol/L was added to the culture medium at 6 h after the addition of β-AP 25 μmol/L and the neurons were incubated for another 18 h.In part Ⅱ 18 wells of neurons were randomly divided into 6 groups(n=3 each):group I control (C) ; group IIβ-AP 25 μmol/L; group III intralipid; group IV,V,and VI 3 prepofol treatment groups (P1,P10,P50).In intralipid group equal volume of 10% intralipid was added to the culture medium at 6 h after β-AP 25 μmol/L and the neurons were then incubated for another 18 h.In group IV- VI propofol 1,10 and 50 μmol/L were added at 6 h alter β-AP 25 μmol/L respectively and the neurons were incubated for another 18 h.The amount of lactic dehydrogenase (LDH) released was measured.Neuronal viability was assessed by MTT assay.The neuronal apoptosis was detected using Hoechst33342 staining and TUNEL technique,and the.apoptosis rate was calculated.Results In part Ⅰ there was no significant difference in the amount of LDH released between group Ⅱ(β-AP) and the 2 propofol pretreatment groups(Ⅲ,Ⅳ).The amount of LDH released was significantly lower in group Ⅴ (propofol treatment) than in group β-AP(Ⅱ).In part Ⅱ the amount of LDH released was significantly lower,neuronal viability higher and the apoptosis rate was lower in group P50 than in group Ⅱ(β-AP).Conclusion Propofol 50 μmol/L given after β-AP can attenuate β-AP induced injury to cultured rat cortical neurons while prophylactic administration of propofol can't.

Objective To study the effect of pluripotency factor Nanog on the expression of the cell cy-cle related proteins,and then to explore its effect on the proliferative ability of HepG 2 cells.Methods TALENs gene editing tool was employed to induce mutation and downregulation expression of Nanog .T7 endonuclease 1 and genomic sequencing was used to analyze the mutation efficiency of Nanog .RT-PCR and western blot were used to determine the expression of mRNA and protein of Nanog ,respectively .Real-time cell based assay system was used to measure the proliferative ability of wild -type HepG2 cells and monoclonal HepG 2 cells with Nanog mutation.Results TALENs successfully induced mutation of Nanog gene .The targeting efficiency of mixed cells was analyzed by T7 endonuclease 1 approached 40%after two transfection with plasmid of Nanog -TALENs.Ad-ditionally,the Nanog mRNA expression level of monoclonal HepG 2 with Nanog mutation was downregulated by 3.4 times compared to the wild type HepG 2 cells,and the Nanog protein expression level was downregulated by 3.6 times.The cell cycle related proteins CyclinD1/D3,CyclinE1 and CDK2 expression were downregulated in monoclonal HepG2 with Nanog mutation in comparison to the wild type HepG 2 cells.Conclusion Nanog plays a role in influencing the proliferative ability of HepG 2 cells through modulating the expression of the cell cycle re-lated proteins CyclinD1/D3,CyclinE1 and CDK2.The downregulation expression of Nanog can inhibit the prolif-erative capacity of HepG 2 cells via the regulation of the cell cycle related proteins .

OBJECTIVE:How to explain and predict individual difference of artificial cochlea so as to evaluate rehabilitative effect of implant has been paid much attention by audiological scholars,clinical physicians,patients,and their relatives. This study was designed to analyze and evaluate rehabilitative status of patients accepting artificial cochlea implantation to investigate the relative influential factors of auditory rehabilitation. METHODS:A total of 28 patients were selected from Department of Otolaryngology Head and Neck,Affiliated Hospital of Qingdao Medical College from June 2002 to April 2008. They were accessed by age,time of rehabilitation training,usage of hearing aids,audiology and aural image before surgery,and NRT monitoring in cochlear implantation so as to observe auditory improvement. The clinical results were analyzed to detect the effect of various factors on auditory rehabilitation. RESULTS:Age,preoperative preparations and good audiology and aural image are important premises for a successful rehabilitation. Longer the time of using hearing aids and language rehabilitation are,and better results will get. NRT response during operation is also an important factor for good auditory rehabilitation. CONCLUSION:The influential factors of auditory rehabilitation after cochlear implant included the age,audition remains,usage of hearing aids,NRT response during operation,and the time after the cochlear implant operation.

Objective To observe and analyze the outcomes o f open reduction and Y plate internal fixation in treatment of intra-articular calcaneal fractures.Methods Open reduction and Y plate internal f ix-ation by the extended L-shaped lateral approach were performed in 68pati ents with 82cases of intra-articula r calcaneal fractures under X-ray.Results82cases were followed up for an avera ge of 26months,and the clinical results were evaluated wit h the Maryland Foot Score.58cases ac hieved excellent results,16good,6fair,with the rate of excellent and good re sults being 90.24%.Conclusion Open reduction and Y plate internal fixation can obtain good clinical re sults in treatment of intra-articul ar calcaneal fractures.[

Objective To observe the effect of HBO in the treatment of artery complications after liver transplantation.Method Five cases were treat by HBO(202.65 kpa,once every day,oxygen inhalation 60 min) and other therapies after operation.Result After HBO,the whole-body situations were obviously improved,liver functions were ameliorated,no new necrotic focuses were found,and the primary necrotic focuses were reduced or vanished.Conclusion HBO was an effective way to treat and prevent the artery complications after liver transplantation and protect the ischemic liver cells.

Objective To investigate the changes of liver histology and ultrastructure in aged Beagles dogs.Methods A total of fifteen healthy Beagles,1 .5 to 10.6 years old,were divided into middle-aged group (n=8,average (2.21 ±0.94)years old)and aged group (n=7,average (8.26±1 .52) years old)according to age.After intravenous anesthesia,the liver tissues of dogs were taken to compare number and morphology of hepatocytes and extra cellular matrix (ECM)of two groups under light microscope with hematoxylin-eosin staining.The number density, morphology and area fraction of mitochondria,the morphology and area fraction of endoplasmic reticulum,the changes of number density and morphology of microbody,the thickness of hepatic sinusoidal endothelial cell as well as the density and the diameter of fenestrae,the changes of morphology and number of lipofuscin in two groups were compared under electron microscope.Independent sample t-test was performed for comparison between two groups.Results Under light microscope,hepatocytes were arranged radially around the central veins,especially obvious in the middle aged group. Hepatocytes were circular or oval,most were mononuclear or binuclear.The cytoplasma of hepatocyte in middle-aged group was dense eosinophilic pink.Vacuolar lipid droplets were small and scanty.The cell boundary was clear.In aged group, cytoplasmic vacuolization of hepatocyte was more obvious,bigger vacuolated lipid droplets were observed, eosinophillic granules were scattered in the cytoplasma,cellular boundary was blurry and the number of hepatocytes significantly decreased when compared with middle-aged group ((75 .80 ±5 .76 )/high power field (HPF)vs (97.80 ±6.45 )/HPF,t = -2.510,P =0.026 ).There were no obvious infiltration of inflammatory cells in the liver tissue of Beagles dogs in both middle-aged group and aged group.Compared with middle aged group, cell gap and ECM increased in aged group. Under electron microscope, mitochondria of normal hepatocyte was oval,round or horseshoe-shaped with double membranes,ridge was observed inside and distributed around nucleus.Compared with middle-aged group,the shape of hepatocyte mitochondria in aged group was varied,the number density of mitochondria significantly decreased (0.202±0.021 vs 0.248 ±0.040,t = -2.683,P =0.020)and the area fraction remarkably reduced (0.136 ±0.015 vs 0.202 ±0.019,t = -6.083,P <0.01 ).Endoplasmic reticulum was mesh laminated arranged,scattered flake distributed and was mostly seen around nucleus in flat or stacked shape.Compared with middle aged group,the area fraction of endoplasmic reticulum of hepatocyte in aged group was obviously reduced (0.006±0.001 vs 0.011 ±0.004,t=-3.338,P =0.005).Lipofuscin was shaped as round or irregular structure without membrane and pigment unevenly distributed inside.The number of lipofuscin in aged group was significantly higher than that in middle-aged group (0.028±0.025 vs 0.001 ±0.000,t=2.880,P =0.014).The number of microbody in aged group was slightly less than that of middle aged group and the difference was not statistically significant (P =0.603).The thickness of the liver sinusoidal endothelium in aged group significantly increased compared with that in middle-aged group ((0.242±0.047)μm vs (0.114±0.075)μm,t=3.881 ,P =0.002).The diameter and density of endothelial fenestration in aged group ((1 .895 ± 0.439 )μm and (0.260 ± 0.120 )/μm)obviously decreased compared with those in middle-aged group ((3.186±0.332)μm and (0.723±0.184)/μm,t=6.345 and -4.511 ,both P <0.01).Conclusions There were significant degradations of liver in quality and quantity among aged individuals.These degradations were the structure basis of decreased hepatic reserve function and involved directly or indirectly in high prevelance of hepatic diseases among elders.

Objective To observe the effect of Weiyanyin on Substance P(SP) in gastric mucosa of experiment bile reflux gastritis rats. Methods The model of experiment bile reflux gastritis was established by gavage of reflux liquid. Compared with Domperidone, the effect of Weiyanyin on pathological histological features and the mucosal SP content of bile reflux gastritis rats was observed. Results The gastric mucosa of rats in model group was damaged, and alopecia of gastric mucosa, and infiltration of a large number of inflammatory cells could be seen.In most of the rats in the model group, atypical hyperplasia and intestinal metaplasia were present. Meanwhile, the content of SP was decreased( P

Colorectal cancer( CRC) has become one of the major cancer threatening residents′health all around the world, and considerable resources are needed for its prevention and control.Economics evaluation could provide the basis of decision-making for improving the allocation efficiency of health resources in the field of CRC prevention and control.This paper comprehensively reviewed the papers that have been published in the field of colorectal cancer screening,from the points of view of published time,regional economic evaluation re-search,evaluation method,the research angle,input and output measurement,model,recommend strategy.