1.A wound dressing made of nanosilver and bacterial cellulose
Fang NAN ; Chen LAI ; Tingfei XI
Chinese Journal of Tissue Engineering Research 2015;(43):7023-7028
BACKGROUND:In recent years, bacterial celulose modified by nano-composite technology has been endowed with new properties. OBJECTIVE:To review the combination of bacterial celulose and nanosilver to prepare wound dressing. METHODS: A computer-online search was performed in PubMed (2013-01/2015-04) and CNKI (2007-01/2015-04) databases to retrieve studies on bacterial celulose, nanosilver and their compound method and application using the key words of “bacterial celulose, nano-silver” in English and Chinese, respectively. RESULTS AND CONCLUSION:Bacterial celulose/nano-silver compound can be prepared by three methods: solution impregnation, in situ composite and biocomposite. Solution impregnation method can lower the concentration of nanosilver ions in the fiber matrix to highly control the release of silver ions, but the genetic toxicity and biocompatibility are unclear.In situcomposite method can reduce the damage to the mesh structure of celulose on which silver ions can be bonded firmly to reduce the toxic damage to cels, but the reducing agent used has a higher toxicity, which is difficult to remove. Biocomposite method cannot produce toxic substance, which is friendly to the environment, and the synthetic biomaterials have less harm to the human body and can be controled highly.
3.Therapeutic effect and mechanism of Xiao'er Zhixie Paste on young chronic diarrhea rats
Zujiao SHI ; Xi JIANG ; Furong CHEN ; Deguang ZHI ; Nan YUE
Drug Evaluation Research 2017;40(4):496-499
Objective To evaluate the therapeutic effect of Xiao'er Zhixie Paste (XZP) by using the young rat model of chronic diarrhea,and to explore its mechanism.Methods Chronic diarrhea model in young rats was induced by ig senna.Rats were ig with Montmorillonite powder of 1.62 g/kg,XZP of low,medium,and high dose (2.03,4.05,and 8.10 g/kg) for treatment.Loose stools rate,loose stool grade and diarrhea index were determined 1 and 3 d after treatment respectively.The water content of small intestine was measured and blood was collected for testing serum succinate dehydrogenase (SDH),amylase,D-xylose by colorimetric determination,testing serum D-lactic acid,IL-1 β,and TNF-α by Elisa after administration.Results The rate of loose stools in XZP 4.05 and 8.10 g/kg dose group,and diarrhea index in 8.10 g/kg dose group significantly reduced after the first treatment.The loose stools rate of XZP 2.03,4.05,and 8.10 g/kg dose group,diarrhea index,serum D-lactic acid level in 4.05,8.10 g/kg group significantly reduced,and serum D-xylose level in 8.10 g/kg dose group significantly increased 3 d after treatment.However,XZP had no significant effect on SDH,amylase activity and IL-1β,TNF-α levels.Conclusion XZP has obvious therapeutic effect on chronic diarrhea in young rats,the mechanism is to increase improve the absorptive function and permeability of intestinal tract.
4.Establishment of an animal model of sacral nerve root avulsion in rats
Xi JIANG ; Aimin CHEN ; Zhiling ZHANG ; Chunlin HOU ; Nan LU
Chinese Journal of Trauma 2009;25(3):267-270
Objective To establish an animal model of sacral nerve root avulsion in rats and e-valuate its efficiency. Methods A total of 20 adult SD rats (either sex) were chosen at random to es-tablish the sacral nerve root avulsion model by avulsing the fight L4-6 nerve roots out of intervertebral fo-ramina without laminectomy. The left side was set as control group. The models were evaluated in aspects of survival rate, Basso-Beattie-Bresnahan (BBB) scores, somatosensory evoked potential (SEP), horse radish peroxidase (HRP) tracing, bilateral weight and cross section area (CSA) of muscle biceps femo-ris, fiber of triceps surae and anterior tibial muscle. Results Of all, 19 rats were survived but one died, with survival rate of 95.0%. The BBB score was (10.78+3.15) points in experimental group and 21 points in control group. The success rate of establishing animal model was 89.5% ,for there detected no SEP in bilateral cerebral cortex of the wounded extremity of 17 rats. HRP showed positive reaction in the spinal segment of L4-6 in two rats but negative in 17, with success rate of 89.5%. There was statistical difference in aspects of weight and muscle fiber CSA of double biceps femoris, triceps surae and anterior fibial muscle between experimental group and control group. Electron microscope found denervation chan-ges including muscle fiber atrophy, nucleus shifting to (center and muscle satellite cell. Conclusion A-vulsion of L4-6 sacral nerve root out of vertebral canal is a feasible and ideal method to establish the avui-sion model of sacral nerve root injury in rats.
5.Molluscicidal experiment of endophytes from Pseudolarix kaempferi Gord
Shangbin GUO ; Jun CHEN ; Jia HE ; Xi CHENG ; Nan ZHONG
Chinese Journal of Schistosomiasis Control 1989;0(04):-
Objective To screen 18 endophytes from Pseudolarix kaempferi Gord for molluscicidal effect and identify them by morphology. Methods Molluscicidal tests were performed according to the immersion test suggested by WHO and the strain screened was identified by the slide culture. Results The mortality rates of snails immersed by JJ18 broth salified (pH=7) were 26.7%, 76.7% and 100.0% for 24,48 h and 72 h, respectively, and 53.3% and 86.7% in 5% and 10% concentrations of JJ18 broth, respectively. The active components were extracellular moiety of the broth which had no acute toxicity to fish, and JJ18 strain belonged to Aspergillus. Conclusion Extracellular moiety of endophyte JJ18 from Pseudolarix kaempferi Gord is a new resource of molluscicide.
6.Vitro study on gene transfection efficiency of hyaluronic acid modified core-shell liponanoparticles in human retinal pigment epithelium cells.
Ya-Nan ZHAO ; Li GAN ; Jing WANG ; Xi CHEN ; Zheng JIA ; Yong GAN ; Jian-Ping LIU
Acta Pharmaceutica Sinica 2014;49(5):711-717
The aim of this study is to prepare hyaluronic acid (HA) modified core-shell liponanoparticles (pHA-LCS-NPs) as gene delivery system and investigate its gene transfection efficiency in human retinal pigment epithelium (ARPE-19) cells in vitro. The pHA-LCS-NPs was prepared by firstly hydrating dry lipid film with CS-NPs suspension to get LCS-NPs, then modifying the lipid bilayer with HA by amidation reaction between HA and dioleoyl phosphatidylethanolamine (DOPE). Its morphology, particle size and zeta potential were investigated. XTT assay was used to evaluate the cell safety of different vectors in vitro. The gene transfection efficiency of pHA-LCS-NPs modified with different contents of HA was investigated in ARPE-19 cells with green fluorescent protein (pEGFP) as the reporter gene. The results showed that the obtained pHA-LCS-NPs exhibited a clear core-shell structure with the average particles size of (214.9 +/- 7.2) nm and zeta potential of (-35 +/- 3.7) mV. The 24 h cumulative release of gene from pHA-LCS-NPs was less than 30%. After 48 h incubation, gene transfection efficiency of pHA-LCS-NPs/pEGFP was 1.81 times and 3.75 times higher than that of CS-NPs/pEGFP and naked pEGFP, respectively. Also no obvious cytotoxicity was observed on pHA-LCS-NPs. It suggested that the pHA-LCS-NPs might be promising non-viral gene delivery systems with high efficiency and low cytotoxicity.
Cell Survival
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Gene Transfer Techniques
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Genes, Reporter
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Genetic Vectors
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Green Fluorescent Proteins
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metabolism
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Humans
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Hyaluronic Acid
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chemistry
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pharmacology
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Lipids
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Nanoparticles
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Particle Size
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Phosphatidylethanolamines
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chemistry
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pharmacology
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Retinal Pigment Epithelium
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drug effects
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Transfection
7.Density and Affinity of IL-6 Receptors in Human Leukemic Cells
Shuang LIU ; Yongzhi XI ; Siqi GUO ; Nan LIU ; Min TU ; Li JIN ; Xingguo CHEN ; Fanhua KON
Chinese Journal of Cancer Biotherapy 2000;7(4):255-260
Objective: To make a study of density and affinity of IL-6R in human leukemic cell lines, and discuss the affection of high affinity IL-6R to the targeted treatment of leukemia with IL-6-PE40 fusion protein. Methods: Radial binding assay with scatchard plot and FACS were used to analysis the density and affinity of IL-6R and protein expression of IL-6Rα and β subunits in totally 8 representative human leukemic cell lines. Results: Myelocytie, monocytic and erythrocytic leukemic cell lines U937, HL-60, KG1 and TF1 express high affinity IL-6R, whose average density per cell is 2 502,2 874, 2 319 and 9 329 respectively, however no 125I-IL-6 binding was detected on chronic myelocytic leukemic cell line K562 and lymphoblastic leukemic cell lines such as Raji, CEM and HUT28. These results correlate with those of FACS highly. Conclusion:These observations suggest that acute nonlymphoblastic leukemic cells may be more suitable for targeted treatment with IL-6-PFA0 fusion protein.
8.Treatment of Tile type C pelvic fracture with legacy pedicle screw system plus minimally invasive technique
Aimin CHEN ; Nan LU ; Xi JIANG ; Di YANG ; Jun LI ; Zhiling ZHANG ; Tianwen YE ; Liangyu ZHAO
Chinese Journal of Trauma 2011;27(9):789-792
ObjectiveTo investigate the feasibility of Legacy pedicle screw system plus minimally invasive technique in treatment of Tile type C pelvic fracture and evaluate its therapeutic effects.MethodsFrom January 2008 to March 2010, 12 patients with closed Tile type C pelvic fractures were treated with Legacy pedicle screw system plus minimally invasive technique.There were seven males and five females, at age range of 21-60 years (average 39.6 years).All patients had sacrum fractures of the posterior pelvic rings.The anterior pelvic ring fractures included unilateral ischiadic ramus fractures in four patients and bilateral ischiadic ramus fractures in eight.Three patients were combined with shock.The anterior pelvic rings were fixed with minimally invasive reconstruction plates and the posterior pelvic rings fixed with minimally invasive technique plus Legacy pedicle screw system.ResultsThe operation lasted for average 90 minutes (range, 80-110 minutes) , with average intraoperative blood loss of 105 ml (range, 80-150 ml).All patients were followed up for average 18 months (range, 6-32 months), which showed that all patients got satisfactory reductions and that the fractures were healed at one stage, with average period of 11.5 weeks (range, 9-13 weeks).There occurred no infections, failures of internal fixations or nerve injuries.According to improved Lindahl standard of pelvic injury function assessment, the result was excellent in 10 patients and good in two, with average score of 78.6 points.Conclusions Under master of the surgical indications, Legacy pedicle screw system plus minimally invasive technique takes advantages of minor trauma, less intraoperative fluoroscopy, short operation time, good curative resuhs and few complications in treatment of Tile type C pelvic fractures by fixation of the posterior pelvic rings and reconstruction of the anterior pelvic rings.
9.Effects of sulforaphane on brain Aβ deposition and oxidative stress in Alzheimer's disease mice model
Yue ZUO ; Nan CHEN ; Xi LI ; Yue ZHAO ; Li LIU ; Li AN
Chinese Journal of Geriatrics 2014;33(7):799-801
Objective To investigate the interventional effect of sulforaphane (SFN) on brain Aβ deposition and oxidative stress in Alzheimer's disease model mice.Methods Eight-week old C57BL/6J mice were randomly divided into three groups (n =10,each).Mice in two groups (intervention and model)were administered by drinking water containing 0.4g aluminum /100ml water and subcutaneous injection with 200mg/kg D-galactose every other day,added with 25mg/kg SFN to the intervention group or with equivalent double-distilled water to model group by a single oral gavage daily.And equivalent vehicle were given to the control mice.After 90 days,the aluminum levels in blood,brain Aβ depositions,and indices of oxidative stress in cerebral cortex were investigated.Results Blood aluminum level was higher in the AD model and SFN intervention groups than in controls(P<0.01),and was lower in SFN intervention group than in AD model(P<0.01).As compared to controls,the AD model showed that brain Aβ deposition was significantly increased,GPX activity was decreased and carbonyl level was remarkable increased(P<0.05).There were no significant differences between intervention and control group in brain Aβ deposition,GPX activity and carbonyl contents (P>0.05).Brain Aβ deposition was lower in intervention than in model group(P<0.05).There was no significantly differences in brain SOD activity and total hydrosulfuryl content among three groups(P>0.05).Conclusions Sulforaphane can reduce the aluminum level in blood,attenuate Aβ deposition,and regulate the oxidative stress in cerebral cortex in AD model mice.
10.Immunomodulatory effects of 1,25 dihydroxyvitamin D3 in the treatment of experimental colitis
Yueqin LI ; Guangbo ZHANG ; Nan GAO ; Qinhua XI ; Juan DAI ; Weichang CHEN
Chinese Journal of Digestion 2013;(6):394-398
Objective To explore the immunomodulatory effects of 1,25-dihydroxyvitamin D3 (1,25 (OH)2D3) in the treatment of experimental colitis induced by dextran sulfate sodium (DSS) in mice.Methods According to random number table,thirty BALB/c mice were randomly divided into control group,model group,low dose,moderate dose,and high dose intervention group.Mice of model group,low dose,moderate dose and high dose intervention group drank 5% DSS solution for seven days to create colitis model.On the 1st,3rd,5th,7th day,the mice of low dose,moderate dose and high dose intervention group were intraperitoneal injected with low,moderate,and high dose of 1,25(OH)2D3 (50,100 and 200 ng/each mouse,respectively).Mice of control group and model group were intraperitoneal injected with sterile soybean oil as control.The observed indicators included disease activity index (DAI) and colonic histopathological score (HPS).On the 8th day,all mice were sacrificed.The expression of interferon (IFN)-γ,interleukin (IL-17) and IL-21 in mice colon tissues and spleens at mRNA and protein level were measured by reverse transcription-polymerose chain reaction (RT-PCR) and flow cytometry,respectively.The data were analyzed by one way ANOVA.LSD-test or Tamhane test were performed for comparison in groups.Results Compared with the control group,the DAI and colitis HPS of mice in the model group significantly increased (0.33±0.52 vs 7.33±1.03,0.17±0.41 vs 12.00±0.63).Compared with the model group,the DAI and colonic HPS of intervention groups treated with 1,25 (OH)2 D3 declined with varying degrees (2.83 ± 0.40,2.83±0.75,2.33±0.52 and 10.83±0.98,7.50±0.84,6.67±0.52,LSD-t=0.39 and 0.41,all P<0.01).The expression of IFN-γ,IL-17 and IL-21 of the model group were significantly higher than those of the control group.The expressions of IFN-γ,IL-17 and IL-21 of intervention group were signifiantly lower than that of the model group (mRNA:LSD-t =0.12,0.13,0.09; protein:F =20.61,22.46,4.80,all P<0.01).Conclusion 1,25 (OH)2D3 might have a direct role on T-cell phenotype,down-regulate effective cytokines IFN-γ,IL-17 and IL-21 and then play an interventional role.