Objective To discuss the possibility of constructing a new kind of active skin substi tutes.Methods The culture of dermal fibroblasts were isolated from foreskin of an infant; preparation of human acellular amniotic extracellular matrix was conducted through the disposition of detergent and enzyme.Surface structure porosity and pore size were detected through scanning electron microscopy.bFGF-chitosan gelatin microspheres were prepared.The features such as the size distribution,drug content,drug encapsulating and in vitro release were studied with scanning electron microscopy,laser grainsize analyzer and ELISA method.MTT test was performed to observe cell proliferation and evaluate the biocompatibility in vitro.Results The cellular layer of amniotic membrane was completely removed but did not damage the collogen scaffolds structure by the disposal of enzyme and detergent.Scanning electron microscopy showed that the scaffolds had criss-cross structure and high porosity,the pore size was irregular and varied from 10 nm to 100 nm.Scanning electron microscopy of bFGF- gelatin-chitosan microspheres surface structure showed that the microspheres had spherical structure,uniform size and smooth surface quality.Controlled release curve showed that the sudden release of bFGF was obvious.Conclusions A new type of active skin substitutes is prepared through culturing fibroblasts on HAAM loaded controlled-released basic fibroblast growth factor from chi tosan-gelatin microspheres.

Objectives:To understand the medical students'cognition of violence injury medical and the impact of medical injury events reports on medical students.Methods:A sample survey was conducted among 480 medical students in a medical university using self-developed questionnaire.Results:A total of 63.67％ of the medical students get violence injury events information through television news;more than 90％ of medical students were concerned about the media reports of violence injury medical events.The media reports of violence injury medical events had an important impact on medical students,and especially television reports had the greatest impact.41.2％ of the students would enhance their awareness of protection;37.9％ of medical students thought that work passion and enthusiasm would decline;the impact of reports on men was bigger than women (P ＜ 0.05).Conclusion:The report of violence injury medical events has an important impact on medical students.The media should improve self-discipline,create a harmonious public opinion environment and promote the healthy development of doctor-patient relationship.

Animals ; Benzofurans ; pharmacology ; therapeutic use ; Bone Marrow Cells ; cytology ; Cell Differentiation ; drug effects ; Drugs, Chinese Herbal ; pharmacology ; therapeutic use ; Humans ; Mesenchymal Stem Cell Transplantation ; methods ; Mesenchymal Stromal Cells ; cytology ; Myocardial Infarction ; drug therapy ; therapy ; Myocytes, Cardiac ; cytology ; Phytotherapy ; Salvia miltiorrhiza ; chemistry

Objective To analyze and discuss the possible reasons of the bone resorption beneath the prostheses after chin augmentation.Methods Twelve patients were admitted to our department for further correction after chin augmentation with materials.The bone resorption was observed through the clinical research and X-ray examination.Results All the patients were underwent the removal of the materials,genioplasty was performed in 8 patients,and two patients were treated by chin augmentation with polyethylene.All the patients were satisfied with their facial contouring.Mild bone resorption was found in seven patients (depth of bone resorption ≤2 mm),in which five patients were used with silicone materials,two patients were performed with expanded polytetrafluoroethylene implants.Moderate bone resorption was seen in three cases.All of them were used with silicone implants (2 mm ＜ depth of bone resorption ≤4 mm).Severe bone resorption happened in two patients (depth of bone resorption ＞4 mm).One was used with silicone implant,and the other one was carried out with expanded polytetrafluoroethylene implant.Conclusions The imbalance among mentalis muscle,materials and underlying bone might be one of the key reasons.Thus for mild and moderate microgenia cases,chin augmentation with material is suitable,while long-term fellow-up study is necessary.But for the cases of severe mirogenia or microgenia and micrognathia with dentofacial deformity or mentalis muscle hyperactivity,genioplasty might be performed as well to correct their deformities.

Objective:To investigate YKL-40-mediated inflammation in human bronchial epithelial cells and analyzed the soluble factors secreted by bronchial epithelial cells exposed to YKL-40 that were responsible for increasing proliferation and migration of primary normal human bronchial smooth muscle cells (BSMCs).Methods:YKL-40-induced inflammation was assayed in two human bronchial epithelial cells (BEAS-2B cell line and primary human bronchial epithelial cells ,namely HBECs).In addition,we treated BEAS-2B cells and HBECs with YKL-40,and added the conditioned culture media ( YKL-40-BEAS-2B-CM) and ( YKL-40-HBECs-CM) to BSMCs.The proliferation and migration of BSMCs were determined by premixed WST-1 cell proliferation reagent and QCM chemotaxis migration assay ,respectively.Results: Bronchial epithelial cells treated with YKL-40 resulted in a significant increase of IL-8 production,but have no effect about RANTES ,Eotaxin and TNF-α.YKL-40-BEAS-2B-CM and YKL-40-HBECs-CM induced IL-8 was found to further stimulate proliferation and migration of BSMCs ,and the effects were inhibited after neutralizing IL-8.Conclusion:Through investigating the interaction of airway epithelium and smooth muscle ,our findings implicate that YKL-40 may be involved in the inflammation of asthma by induction of IL-8 from epithelium,subsequently contributing to BSMCs proliferation and migration.Moreover, inhibition of IL-8 signaling is a potential therapeutic target for YKL-40-induced inflammation and remodeling of asthma.

Objective To explore the effect of hemeoxygenease/carbon monoxide system on hypoxic pulumonary vascular structural remodeling. Methods Twenty six Wister rats were randomly divided into four groups:control groups( n =6),hypoxia group( n =7),hypxia+ZnPP group( n =6) and hypoxia+CO group( n =7).Pulmonary artery mean pressure(mPAP) of each rat was elaluated by using right cardiac catheterization,the ultrastructaral changes in intra acinar pulmonary muscularized arteries were observed. Results mPAP was significantly increased in hypoxic rats(22?2 31?mmHg)as compared with that of normal controls(16 57?2 51mmHg)( P

Aim To explore the interaction between nitric oxide( NO) and hydrogen sulfide(H 2S) on the relaxation reactivity of pulmonary arteries in rats.Methods Seven male healthy rats were anaesthesed with chloral hydrate; the pulmonary artery of each rat was removed for the study. Th e reactivities of pulmonary artery rings in response to different doses of NO do nar-sodium nitroprusside(SNP) and H 2S donar-NaHS were measured in vitro.DL-propargylglycine(PPG)and N?-nitor-L-methyl ester(L-NAME) were provided to pulmonary artery, respectively;the relaxation reactivities of pulmonary artery were observed.Results The relaxation reactivities of pulmonary arteries showed a dose-dependent increase in response to different doses of SNP and H 2S.The relaxation reactivity to SNP decreased by PPG. The relaxation reactivity to H 2S decreased by L-NAME.Conclusion H 2S acted as a vasorelaxator either independently or accompanied with NO, SNP acted as a vasorelaxator either independently or accompanied with H 2S;the networ k of gastransmitter played an important role in the relaxation of pulmonary arte ries.

Objective To explore the isolation,amplification methods and adipogenic differentiation under specific culture medium of human keloid-derived precursor cell (KPC) in vitro,in order to study their possibility of being new seed cells of tissue engineering fat.Methods KPCs were isolated from human keloid tissue of 4 different patients in our hospital and were cultured in the modified L-DMEM culture medium.Their cloning efficiency and growth curve were tested.The subcultured cells were tested of the mesenchymal stem cell (MSC)-related gene expression by flow cytometry.In addition,they were cultured in H-DMEM medium (containing 1 μmol/L dexamethasone,0.5 mmol/L 3-isobutyl-1-methyl-xanthine 10 mg/L of bovine insulin,100 mmol/L indomethacin,and 10 ％ FBS)and were later observed in oil red O staining under phase contrast microscope to determine whether lipid droplets generation was formed,using skin-derived precursors (SKP) as control.Results More than 95 ％ KPC expressed many antigens of MSC,such as CD29,CD44,CD90 and CD105 while few of them expressed CD34,CD45(1.0 ％-2.5 ％).And the cells increased in size gradually after inducted the same time,changing from spindle into round or polygonal in shape.The lipid droplets were seen in 72 hours and expressed a positive rate of 78.6 ％ in Day 19 in oil red O staining while the same rate was 54.6 ％ in SKP.Conclusions Human keloid-derived precursor cells can express a variety of MSC-related surface markers without expressing hematopoietic stem cell (HSC) related markers.Furthermore,they can be differentiated into fat cells under certain conditions,which may make them as a new source of seed cells for tissue engineering fat.

Objective: To examine the alteration of pathologic structure and endogenous hydrogen sulfide pathway in rats with pulmonary hypertension induced by high pulmonary blood flow. Methods: Sixteen SD rats were randomly divided into shunting group and control group. An 11 week aortocaval shunting was produced in rats of shunting group, and pulmonary artery mean pressure (mPAP) was evaluated using right cardiac catheterization. The ratios of right ventricular mass to body weight (RV/BW) and right ventricular mass to left ventricular plus septal mass[RV/(LV+S)] were also detected. Pulmonary vascular micro and ultra structures were examined. Meanwhile the concentration of plasma hydrogen sulfide (H 2S) was measured by spectrophotography. The gene expression of cystathionine ? lyase (CSE)was detected by in situ hybridization, and the activity of CSE in lung tissues was measured by H 2S production according to chemical analysis. Results: After 11 weeks of aortocaval shunting, pulmonary artery mean pressure was significantly increased. Muscularization of small pulmonary vessels and relative medial thickness of pulmonary arteries were obviously increased in shunting rats compared with controls. Ultrastructure of intrapulmonary arteries changed obviously in shunting rats. Meanwhile, plasma H 2S concentration was decreased and the activity of CSE (according to H 2S production) in lung tissues decreased in shunting rats. CSEmRNA expression by pulmonary arteries was significantly suppressed. Conclusion: Pulmonary vascular structural remodeling is the important pathologic basis for pulmonary hypertension induced by high pulmonary blood flow. The down regula tion of endogenous H 2S pathway might play an im portant role in the development of high pulmonary blood flow induced pulmonary hypertension.

OBJECTIVE:To study the technical conditions and parameters of DiaionHP-20 macroporous adsorption resin for the purification of the anti-PMOP(primary Type I osteoporosis) active fraction from Camellia semiserrata seed.METHODS: With the elution ratios and purity of total flavonoids and polyphenol from Camellia semiserrata as indexes,the technical parameters of DiaionHP-20 macroporous adsorption resin including the adsorption quantity,the loading sample,the elution concentration and volume of alcohol were investigated.RESULTS: The adsorption quantity of DiaionHP-20 macroporous resin on total flavonoids and polyphenol were 59.5 mg?g-1 and 23.9 mg?g-1 respectively.The optimal technical conditions were as follows:the quantity of drug was 10.5 times that of resin;water-soluble foreign substance was washed off with distilled water weighing 3 times the weight of resin,and total flavonoids and polyphenol were eluted using 25% ethanol weighing 13.5 times the weight of resin.CONCLUSION:DiaionHP-20 macroporous resin had good purification effects on total flavonoids and polyphenol from Camellia semiserrata seeds.The process is simple,low cost,and suitable for lavge-scale production.