ObjectiveTo develop a rapid,simple and efficient method for isolating exosomes from cell culture supernatant,so as to promote the application of exosomes in clinical and disease treatment.MethodsA new exosomes extraction system was developed by combining hydroxyl(OH)modified magnetic beads with the polymeric compound Buffer EXD,and the exosomes were extracted from cell culture supernatant by using this system. The expression of exosome marker proteins was detected by Western blot,the particle size and concentration of exosomes were measured by nanoparticles tracking analysis(NTA),and the morphology and structure were determined by transmission electron microscope(TEM). In addition,the extraction methods of exosomes by Buffer EXD system were optimized(pH,Buffer EXD ratio,incubation time,magnetic bead dosage and type),and the effect of exosomes purified by the new system on the proliferation of A549 cells was analyzed by combining cell culture with photomicrograph.ResultsIn exosomes purified by the new system,the expression levels of marker proteins Alix,CD9 and CD81 were high,while the expression level of exosome negative protein Calnexin was low. The exosomes extracted by the new system had a particle size peak of around 100 nm and a classical saucer-like shape. When the new system pH was 5. 0,Buffer EXD concentration was 20%,and 1. 75% OH magnetic beads were incubated with samples for 40 min,the content of marker proteins in exosomes was the highest. Additionally,the exosomes purified by the new system significantly facilitated the proliferation of A549 cells.ConclusionUsing OH-modified magnetic beads as the medium,combined with polymeric compound Buffer EXD,a new system was successfully established,which can isolate exosomes with complete structure,obvious morphological characteristics and biological functions from cell culture supernatant rapidly,simply and efficiently.

Objective To examine visceral fat in pathogenesis of coronary heart disease in male adults .Me thods 64-slice spiral CT were measured to separate 50 patient into the following 2 groups:CAD( n =26)and healthy control( n =24).Results Fasting insulin concentration, Insulin resistance index, cholesterol, triglyceride, waist circumference and visceral fat were higher in coronary heart disease group while the lower in healthy control group ( P <0.01 ) .The levels of fasting insulin concentration was posi-tively correlated with visceral fat ( r =0.779 , P <0.01 ) .Conclusions Coronary heart disease is characterized with insulin resist-ance.Fasting insulin concentration and visceral fat are higher in coronary heart disease group than the healthy group , and they may be involved in the pathogenesis of insulin resistance .

[A Review] The irritable bowel syndrome (IBS) is a chronic functional bowel disorder,and its pathogenesis remains unclear. Serotonin is thought to be an important brain-gut axis neurotransmitter,which plays an important role in the gastrointestinal motility,sensation and secretion. Serotonin is closely associatied with IBS and regarded as one of the therapeutic targets. This article reviews the related investigations in the recent years.

18F-FDG PET has been widely used in myocardial oncology and inflammatory imaging.Suppression of physiological uptake in heart is required for accurate diagnosis of some thoracic diseases,cardiac inflammatory diseases and coronary atherosclerosis.There is no unified criteria to reduce myocardial 18F-FDG uptake.This review summarizes the research progress of inhibiting physiological myocardial 18F-FDG uptake by controlling diet,mediating blood glucose and applying drugs.

ObjectiveTo investigate the cause of clinically missed diagnosis of thyroid microcarcinoma(TMC) and the management. Methods Clinical diagnostic and therapeutic data of 110 cases with TMC operated and confirmed by pathology from Jan. 1985 to Dec. 2000 were analysed. Results Diagnostic positive rates by ultrasonography and freezing section were respectively 58%(15/26) and 66 7%(14/21) in 26 cases diagnosed preoperatively. Diagnostic positive rate of freezing section was 80%(24/30) in 30 cases discovered intraoperatively. Through postoperative pathologic exam,54 cases were confirmed as TMC that was not discovered in 19 cases by intraoperative freezing section.Total or near total thyroidectomy was only performed on 35 cases,lobectomy of one or both lobes on other cases. Follow up rate was 80 1% with time ranging from 6 months to 15 years. One case recurred without mortality.Conclusion The clinical diagnosis of TMC is often difficult to establish. Careful palpation, ultrasonography with fine needle aspiratiou cytology before operation, and thorough exploration of the suspected nodules in operation will help to heighten the diagnostic rate. Total or near total lobectomy fulfils the eradication of TMC.

Objective To observe and classify the characteristics of optical coherence tomography (OCT) for several common diseases which could lead to submacular choroidal neovascularization (CNV), and to provide the warrant to make the differential diagnosis and treatment of CNV. Methods The data of OCT of 165 patients (187 eyes) with CNV due to AMD, CEC, high myopia and ICNV diagnosed by fundus photography and fundus fluorescein angiography (FFA) were retrospectively analyzed, and the images of OCT were classified considering the results of FFA, and the characteristics of different types of the images were sumerized. Results Well-defined fusiform thickening of retinal pigment epithelial (RPE) and choriocapillary layer in CNV with well-defined border (60 eyes), dispersed backscattering increase in poorly-defined CNV (101 eyes), optic darkspace beneath RPE layer in serous detachment of RPE layer (19 eyes), quickly decreased high backscattering region under RPE layer in hemorrhagic detachment of RPE layer (11 eyes), slight to moderate backscattering region between RPE layer in fibrovascular detachment of RPE layer (10 eyes), and detachment of neurepithelial layer from RPE layer with the optic darkspace between the layers in detachment of neurepithelial layer (45 eyes) were observed. Conclusions The images of OCT for the common diseases which could lead to submacular choroidal neovascularization may be divided into 6 types. Analyzing the characteristics of images of OCT is helpful in differential diagnosis and treatment of CNV.

Objective To investigate the therapy effect of deanxit combined with large dose of oryzanol in the treatment of post stroke depression(PSD) and anxiety in elderly male.Methods Sixty cases of PSD and anxiety patients were divided into three groups by random number table method with 20 cases in each,deanxit group treated with deanxit,oryzanol group treated with oryzanol,and combination group treated with deanxit and large dose of oryzanol,a total of 4 weeks.Before and after 4 weeks treatment respectively using Hamilton depression scale (HAMD) and Hamilton anxiety scale (HAMA) scores.Results The HAMD and HAMA scores before treatment in three groups had no statistical significance (P ＞ 0.05).Compared with before treatment,HAMD and HAMA scores in three groups after treatment were significantly lower (P＜ 0.01).HAMD scores in combination group were improved better than those in deanxit group and oryzanol group [(12.85 ± 3.69) scores vs.(15.30 ± 3.28),(18.65 ± 3.13) scores](P＜ 0.01),and deanxit group were better than oryzanol group(P＜ 0.01).HAMA scores in deanxit group and combination group were lower than those in oryzanol group [(8.65 ± 3.33),(7.25 ± 3.34) scores vs.(10.65 ± 3.18) scores] (P ＜0.01).Conclusion Deanxit combined with oryzanol is effective in the treatment of PSD and anxiety in elderly male.

Objective To investigate the relationship between transfusion transmitted virus (TTV)infection and neonatal hyperbilirubinemia,the effect of TTV infection on the liver function, and analyse the feature of nucleotide sequences in TTV ORF1.Methods Serum TTV DNA,which were from 58 neonates with high direct bilirubin(DB,including 5 with hepatitis Syndrome),92 ones with high indirect bilirubin(IB),and 85 normal ones,was detected using a nested polymerase chain reaction technique(nPCR),electropherosis and sequence analyse,and serum alanine amniotransferase (ALT)was determined in all neonates.Results In DB neonates,TTV DNA were detected in 7 neo- nates(12.1%,including 3 neonates with hepatitis syndrome);in IB and normal ones,1 neonate had positive TTV DNA(1.1% and 1.25),respectively.Even if there were point mutations in Guangdong's TTV,the homology of Guangdong's TTV(GD1-9)and Japanese TTV(N22)ranged from 87.1%～97.8% at nucleotide level.Conclusion TTV infection may be one of important pathogenesis resulting in neonatal hyperbilirubinemia and liver damage in such patients.Guangdong's and Japanese TTV isolates had the same genotype,some gene mutations maybe increase the pathogenicity in TTV.

Objective To ensure the quality of live attenuated measles vaccine on the market,viral titers were determined as the market surveillance test.Methods The measles vaccine was sampled from sites located in 24 provinces (cities,autonomous regions) of China,including provincial CDC,municipal CDC,county CDC,and primary users.The virus titer of samples was tested to evaluate the quality status of measles vaccine on the market.Results For all the 54 lots of measles vaccine sampled in this study,the virus titers were in compliance with the requirements of the China Pharmacopeia Vol.III (2005 edition).In comparison with the original test results provided by the manufacturers,the mean virus titer was decreased 0.2 lg?0.3.Conclusion Viral titers of measles vaccine batches sampled from the market were all in compliance with the requirements of the China Pharmacopeia Vol.III (2005 edition).It showed that the measles vaccine in China market has good stability,and the cold chain system for measles vaccine conveyance and storage could ensure the vaccine efficacy.

Objective To explore the feasibility and advantage of the small figure-L unilateral transternal incision for the treatment of anteri or mediastinal tumor. Methods Twenty-four patients with anteri or mediastinal tumor were enrolled in the study. Under general anesthesia, after a 6 to 10 cm midline skin incision was made, a unilateral figure-L partial ste rnotomy on the side occupied by the tumor was made in the second or third interc ostals space, taking into account the tumor size and location. Tumors were resec ted with excellent exposure. Results All tumors were completely resected during the operation. In 8 cases, tumors encroached on the adjacent lu ng tissue, and lung tissue was partially resected. In 6 cases, tumors invaded th e pericardium, and the pericardium was partially removed. Mean operating time wa s 106 minutes (80~125 minutes). The mean time of hospital stay was 5 days after the operation, and there was no complication. All patients were alive with a mea n follow-up period of 14 months (3~24 months). Conclusion The figure-L unilateral mini-sternotomy is considered as an effective and useful mi nimally invasive approach for anterior mediastinal tumors.