Objective:To study the long-term inhibitory effect of external stent on atherosclerosis of autologous vein graft in hypercholesterolemic rabbit and the possible mechanism.Methods:Hypercholesterolemic model was established in 15 rabbits and their bilateral jugular veins were anastomosed with bilateral carotid arteries.One jugular vein graft was stented with a polytetrafluoroethylene tube(external stent group)and the other receiving no stenting served as control(unstent group).Ultrasound was used to evaluate the haemodynamics 12 weeks after operation.The grafts were harvested to examine the thickness and area of intima and media,the deposition of lipid in the vessel wall,and the distribution of VCAM-1 positive cells.Scanning electron microscope(SEM)was used to evaluate the regeneration of endothelium.Results:Ultrasound results showed that the stent group was laminar blood flow and the control group had vortex flow.The thickness and areas of intima and media were significantly lower in the stent group than in the control group(P

BACKGROUND: Studies have demonstrated that intervention material retention for a period of time in vivo causes pathogenic bacteria surface attachment, proliferation even forming biofilm to become potential source of high polymer catheter-associated infection. Inhibition of biofilm formation significantly reduces infection.OBJECTIVE: To evaluate the antimicrobial effect of anti-infective polyethylene material and its inhibiting effect to biofilm on the surface.DESIGN, TIME AND SETTING: Single sample observation was performed at the National Engineering Research Center for Engineering Plastics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences from June 2008 to May 2009, and the antimicrobial test was performed at the General Hospital of General Staff Headquarters of PLA in March 2009.MATERIALS: Organic antibacterial agent2,4,4'-trichloro-2'-hydroxydiphenyl ether; IONPURE~(R) Silver-Inorganic anti-microbialreagent; low-density polyethylene (LDPE).METHODS: LDPE was respectively blended with organic antibacterial agent and inorganic antibacterial agent, and the LDPE slice was prepared by injection molding process.MAIN OUTCOME MEASURES: The antimicrobial efficacy of anti-infective polyethylene was determined by the plate counting method. The ultrasonic-plate method and scanning electron microscopy were introduced to observe the biofilm formation.biofilm maturation. The propagation of microbe was found to be depressed remarkably on the surfaces of modified samples with organic antibacterial agent, and the formation of biofilm was prevented. The observation of SEM confirmed that no biofilm was formed on the surfaces of PE added organic antibacterial agent. The results showed that a large amount of bacteria and extracellularpolysaccharide matrix adhered on the surfaces of PE added inorganic antibacterial agent and untreated PE.CONCLUSION: Anti-infective polyethylene added organic antibacterial agent possesses excellent antimicrobial performance against S. aureus and E coli, and it can inhibit the formation of biofilm on the surfaces, which provides a promising approach to prevent catheter-related infections.

Objective To explore the surgical procedures and effects for recurrent scalp dermatofibrosarcoma protuberans (DFSP).Methods Retrospective review was conducted in 7 scalp recurrent DFSP cases in the past 3 years.Intraoperative frozen section analysis of surgical margins was performed.Wide local excision with margins of 3 cm or more was applied,and excision of the skull external lamina or the entire layer of the cranial bones was performed once the skulls under the tumors were invaded.Frozen section analysis was again performed on all the margins.Secondary wound was repaired with local skin flap or fascial pedicled flaps.Surgically removed tumor was paraffin-embedded for HE-staining and immunohistochemical analysis.Results All of 7 tumor specimens were proved recurrent DFSP with histologic findings of intraoperation or postoperation.7 patients were all performed with wide local excision with margins of 3 cm or more,also with skull excision (5 cases with excision of skull external lamina and 2 cases with excision of the entire layer of skull).Negative margins were confirmed with intraoperative frozen sections or postoperative paraffin-embedded sections analysis were confirmed.Immunohistochemical analysis demonstrated that Ki-67 was all positive and CD34 was partially positive in 7 cases.No tumor recurrence or metastasis had been observed in any of our patients after a median follow-up duration of 17 months (range 15-41).Conclusions Wide local excision together with the skull invaded by tumors completely is effective surgical treatments for recurrent scalp DFSP; Use of scalp transferring technique could improve wound repair after complete tumor excision.

OBJECTIVE To study the antimicrobial activity of antimicrobial plastics and its depressing effect to biofilm on the plastics′s surface. METHODS Test tube dilution method was adopted to study the antimicrobial activity and spectrum of antimicrobial plastics. Plate live bacterial recording method and scanning electron microscope(SEM) were introduced to study the formation of biofilm. RESULTS Wide inhibiting spectrum to pathogenic microbe such as Pseudomonas aeruginosa,Staphylococcus aureus,and Escherichia coli was confirmed,and the biofilm was formed after four stages,ie deposit,adhesion,propagation and biofilm formation,and propagation of microbe was found to be inhibited greatly in the surface of antimicrobial plastics,so that the formation of biofilm in the surface of antimicrobial plastics was held back,and the observation of SEM also confirmed that no biofilm was formed in the antimicrobial plastics′s surface. CONCLUSIONS Antimicrobial plastics could inhibit pathogenic microbe remarkably with wide inhibiting spectrum,and it could also depress the formation of biofilm in the surface,which indicated that it is a promising approach to prevent catheter related infections by adopting antimicrobial catheters.

Objective To study the prevention effects of AduoLa Fuzhenglin(ADL)Oll the brain injury induced by microwave radiation in rats.Methods A total of 140 male Wismr rats were divided randomly into 5 groups,including control group,microwave exposed group,low dosage(0.75 g·kg-1·d-1)group.middle dosage(1.5 g·kg-1·d-1)group and high dosage(3 g·kg-1·d-1)group.Rats in three ADL groups were lavaged with ADL per day for 2 weeks before radiation.After administration,rats were exposed to microwave at 30 mW/cm2 for 15 min.The abilities of learning and memory were detected by Morris water maze,and the contents of amino acids neurotransmitter of hippocampus were detected by HPLC, then the histology and uhrastrncture of hippocampus were observed with light and electron microscope at 6 h,7 and 14 d after exposure.Results The abilities of learning and memory were declined(F=0.000-0.043,P<0.05)from 6 h to 7 d after exposure,and the contents of four kinds of amino acid neurotransmitter in hippocampus were decreased,of which GLU,GLY and GABA were decreased significantly(F=0.000-0.007,P<0.01)at 6h after exposure,then tissue edema,neuronal degeneration,neuron mitoehondria swelling and cavitation,endocytoplasmie rotieulum broaden,synaptic cleft blurred,and perivascular space widen were found in the hippocampus at 6 h and 7 d after exposure.The changes in low dosage group were similar to those of the radiation group.However,in middle and high dosage groups,the abilities of learning and memory were normal to some extent with the significant differences compared to the radiation group from 6 h to 7 d after exposure(F=0.015-0.028.P<0.05).The contents of four kinds of amino acid neurotransmitter were not decreased,especially GLU contents close tO normal level.There were significant differences between middle and high dosage groups and radiation group at 6 h after exposure(F=0.000-0.042,P<0.05).Moreover,no obvious injury in the hippocampus was observed in middle and high dosage groups at 6 h and 7 d after exposure.Conclusions Exposure to 30 mW/cm2 microwave radiation could decrease the abilities of learning and memory,induce amino acid neurotransmitter turbulence,and injure the histology and uhrastructure of hippocampus.ADL at the dosages of 1.5 and 3 g·kg-1·d-1 would have preventive effects on the injury induced by microwave exposure.The concentration of 1.5 g·kg-1 ·d-1 of ADL might be the effective dosage to prevent the brain damage after microwave exposure.

OBJECTIVE: To explore the effects of c-Met-siRNA on the proliferation, movement and invasion of laryngeal carcinoma Hep-2 cells in vitro. METHOD: Firstly, the pSilencer 2.0/c-Met-shRNA recombinant plasmid was transfected into laryngeal carcinoma Hep-2 cells with transfecting agent of cationic liposome Lipofectamine 2000. Secondly,the transfection efficacy was tested by RT-PCR and Western-Blot, then the most inhibitive c-Met-siRNA sequence was elected. Cell proliferation, movement and invasion were detected with MTT, cell migration assay and cell invasion assay, respectively. RESULT: After the transfection of pSilencer 2.0/c-Met-shRNA recombinant plasmid into laryngeal carcinoma Hep-2 cells, the expression of mRNA and protein of c-Met decreased significantly in Hep-2 cells, and ability of the proliferation, movement and invasion of laryngeal carcinoma Hep-2 cells were also inhibited. CONCLUSION The results indicated that c-Met-siRNA can down-regulated the expression of c-Met and markedly inhibited laryngeal carcinoma Hep-2 cell proliferation, movement and invasion. It may have the potential as a therapeutic modality to treat human laryngeal carcinoma.
Apoptosis ; genetics ; Carcinoma, Squamous Cell ; genetics ; pathology ; Cell Line, Tumor ; Cell Proliferation ; Humans ; Laryngeal Neoplasms ; genetics ; pathology ; Liposomes ; Proto-Oncogene Proteins c-met ; genetics ; RNA, Messenger ; genetics ; RNA, Small Interfering ; genetics ; Transfection

Objective:To investigate the effect of artificial dermis combined with KCI negative pressure suction device in the repair of scalp defect with skull exposure after the operation of scalp malignancy.Methods:From January 2016 to June 2018, 18 patients with scalp defect and skull exposure after scalp malignant tumor surgery were treated with artificial dermis combined with KCI negative pressure suction device.Results:Eighten patients had good wound healing after the first stage of surgery, and no infection occurred. The time for artificial dermis to complete granulation was 10-14 days, with an average of 12.1 days. After the second stage of skin grafting, the skin graft had a survival rate of 100%, with uniform color and good elasticity, without obvious scar hyperplasia or contracture. The postoperative follow-up period was 6 to 2 months, all the patients healed well without tumor recurrence, with good skin elasticity and friction-resistant, and they were satisfied.Conclusions:Artificial dermis combined with KCI negative pressure suction device is an effective and simple method to repair the scalp defect with skull exposure after tumor surgery.

Objective:This paper introduces the concepts of " patient-centered cell therapy research management model", to provide reference for domestic medical institutions which conduct cell therapy clinical trials.Methods:We reviewed and summarized the experiences of conducting cell therapy at Peking University Shenzhen Hospital, including challenges and response plans regarding to the technology assessment, ethical evaluation risks and regulatory compliance. According to which, this paper aims to explore the reflections and practical experience of establishing a patient-centered, multi-stakeholder shared decision-making research management system.Results:The " patient-centered cell therapy research management model" ensures the reliability of research results through multi-stakeholder engagement in decision-making and management, adequate technical evaluation, effective ethical review and harmonized scientific research management, which not only meets the urgent health needs of the patient, but also promotes the standardized development of emerging technologies.Conclusions:The " patient-centered cell therapy research management model" is tailored for the cell therapy research, it is important to promote its further assessment and applications.

Objective To investigate the effects of adoptive reinfusion of regulatory T cell (Treg) on the recovery of islet function and graft survival time after islet allograft transplantation. Methods The diabetic model was established using C57BL/6 mice as recipients, and Balb/c mice were chosen as donors for islet allografts transplantation beneath the renal capsule. The recipient mice were divided into 3 groups and 3 mice in each group according to different processing Methods: Treg experiment group (Treg group, 1×10⁶ Treg cells were injected via tail vein at 1 d before operation), positive control group [sirolimus (SRL) group, SRL at a dose of 300 μg/(kg·d) was intragastrically given every day from 1 d before operation] and blank control group (control group, an equivalent volume of normal saline was intragastrically given every day from 1 d before operation). Enzyme-linked immune absorbent assay (ELISA) was used to detect the changes of blood glucose and C-peptide in mice within 14 days after transplantation. In vivo imaging technique was used to dynamically monitor the survival of mice within 14 days after transplantation. Results In each group, the blood glucose levels at postoperative 3 d were significantly decreased compared with those before transplantation (all P < 0.001). At postoperative 1 d, the C-peptide levels showed an explosive rise to varying degree in each group. At postoperative 3 d, the C-peptide levels in each group were significantly higher than that before operation (all P < 0.001). At the end of the observation period at 14 d after operation, the C-peptide levels in the SRL and Treg groups were (427±50) pmol/L and (833±57) pmol/L, relatively higher than that in the control group. But the blood glucose levels were (14.5±0.5) mmol/L and (12.1±0.6) mmol/L, significantly lower than that in the control group (all P < 0.001). Compared with the SRL group, the explosive release amount of C-peptide was significantly lower, the declining trend was more remarkably stable, and the C-peptide level was considerably higher in the Treg group at the end of the observation period (all P < 0.001). At postoperative 14 d, the grafts were almost completely apoptotic in the control group, over 50% of the grafts survived in the SRL group, and over 80% of the grafts survived in the Treg group. Conclusions Adoptive reinfusion of Treg cells can effectively protect islet grafts, prolong the survival time of grafts, and maintain the normal levels of blood glucose and C-peptide in the recipient mice.