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Volume ， Issue 5 ， 2007
- Abstract：Objective:To isolate virulent bacteriophage from environment samples and explore the potential way of decontaminating the environmental wastewater. Methods: The standard plaque assay, negative staining transmission electron microscopy （TEM）, genome extraction and nucleases test were used to isolate bacteriophages. Then its morphology and characteristics were examined. Results: A novel bacteriophage XY-1 was isolated from a sewage pond in a hospital. It infected and killed 6 E.coli reference strains. The phage had a round head （diameter 40-50 nm）, no tail and the genome was ssRNA of approximately 5.0 kb. It was able to reduce E.coli to an extent of 44.63% to 67.00% when being added into the samples of different raw sewage water, depending on the contact time, the temperature and the phage dose. Conclusion: From the morphology typical and nucleotide characteristics （RNA） of the genome of phage, phage XY-1 appears to be closely related to phage f2. It may have some effects for the control of E.coli in sewage water.0|32|2Updated：2026-03-12
- Abstract：Objective:To obtain high purity of human fetal olfactory bulb ensheathing cells （OB-hOECs） in vitro and to develop a simple and effective method for primary culture of OB-hOECs. Methods: OB-hOECs were cultured based on the differential rates of attachment of the various harvested cell types. Then the method was combined with arabinoside cytosine （Ara-C）inhibition, serum-free starvation or intermittent neurotrophin 3 （NT3） nutrition method to observe cell states in different cultural environments. The purity of OB-hOECs was assessed with immunocytochemical analysis. Results: OB-hOECs appeared bipolar and tripolar shape, with slender processes forming network. The purity of OECs reached 88% with the selective attachment method on day 6, and then fibroblast proliferated quickly and reduced the purity. When combined with the starvation method, the purity of OECs was 91% on day 6 and 86% on day 9, however, OECs were in a poor state. While combined with the NT3 method, the purity reached 95% on day 9 and 83% on day 12, respectively. The cells still remained in a good state. Conclusion: A combination of selective attachment and intermittent NT3 nutrition is an effective method to obtain OECs with higher purity and quality.0|58|3Updated：2026-03-12
- Abstract：Objective:To investigate the activity of anti-malarial dihydroartemisinin （DHA） on tumor growth, lymphangiogenesis, nodal and lung metastasis and survival in mice bearing Lewis lung carcimoma （LLC）. Methods: The models of C57BL/6 mice transplantation tumors were established via subcutaneous injection of LLC cells and divided into 4 groups: control group, DHA group, DHA+ferrous sulfate （FS） group and FS group, with 25 mice in each group. Tumor volumes and weights, nodal and lung metastasis, and survival were monitored. Tumor lymphatic microvessel density （LMVD） was determined by lymphatic vessel endothelial hyaluronan receptor-1 （LYVE-1） immnohistochemistry. After LLC cells were treated with DHA or DHA+FS, protein and mRNA levels of vascular endothelial growth factor （VEGF） -C were evaluated by Western blotting and real time quantitative RT-PCR, respectively. Results: Oral administration of DHA or DHA+FS inhibited lymph node and lung metastasis, and prolonged survival. However, no significant tumor growth retardation effect was observed when mice were treated with DHA alone. The inhibited tumor metastasis was related to the decreased LMVD in the peritumoral regions, but not in the intratumoral regions. DHA significantly down-regulated the expression of VEGF-C protein and mRNA in LLC cells. Conclusion: DHA effectively inhibits LLC transplantation tumor lymphangiogenesis, nodal and lung metastasis, and may be a promising chemotherapeutic agent for controlling lung cancer metastasis by decreasing VEGF-C expression.0|23|3Updated：2026-03-12
- Abstract：Objective:To observe the expression level of TNF-α mRNA in rats with hepatic fibrosis induced by dimethylnitrosamine （DMN） and to explore its relationship with collagen metabolism and its diagnostic value for hepatic fibrosis.Methods: Twenty-five male Wistar rats were randomly divided into normal control group （n=10） and model group （n=15）. Model rats were induced by DMN for 4 weeks and at final stage were executed. TNF-α mRNA were detected by RT-PCR and the inflammatory necrosis and collagen deposition in hepatic tissue were observed by HE stain and Sirius red stain. The liver functions were determined by automatic biochemical analytic device. The serum marks of liver fibrosis, such as HA, LN and Ⅳ-C were measured with ELISA and RIA. Results: In this study, the rat model of liver fibrosis induced by DMN was successfully constructed. RT-PCR reveals that TNF-α mRNA expression in control group is lower than that of model group. The liver functions of model group were impaired compared with those of the control group （P<0.01）. Semi-quantitive analysis revealed that TNF-α/β-actin of normal rats was 0.39±0.12, while 0.93±0.05 of model rats. The concentration of HA （434.44±98.81 vs 252.9±26.59 ng/ml, P<0.01）, LN （70.67±6.32 vs 37.90±5.97 ng/ml, P<0.01） and Ⅳ-C （79.39±10.52 vs 21.40±4.17 ng/ml, P<0.01） were significantly increased in the model group as well. Changes of the indexes were similar to the pathological damage of the liver. Conclusion: The results suggested that activation of TNF-α in liver tissues may be the common pathogenic mechanism of liver fibrosis. TNF-α may be a useful index for the diagnosis of hepatic fibrosis which worthies further investigation.0|25|0Updated：2026-03-12
- Abstract：Objective:To study the effect of reactive oxygen species of inducing apoptosis on the heptocacinoma tissues following ischemia and reperfusion and perfusion hyperoxia liquid of hepatocarcinoma. Methods: The hepatocarcinoma animal models ware established by implantation of VX2 tumor constitution mass into the left middle lobe of liver of rabbits. The animals were subjected to 60 min clamp-induced ischemia of hepatic artery distributing in the left middle lobe followed by reperfusion at 1 h, 1 d, 3 d and 7 d, respectively, and perfusion hyperoxia liquid （partial pressure of oxygen, PO2>80 kPa） at the same time with reperfusion beginning. The concentration of MDA and NO ware tested. Apoptotic changes in the hepatocarcinoma and normal hepatic tissues were observed by means of HE staining and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling （TUNEL）. Results:The concentration of MDA in normal hepatic tissues and hepatocarcinoma tissue increased followed ischemia and reperfusion especially for reperfusion 1 h （4.61±0.40, 3.10±0.23） and restored to normal level at reperfusion 7 d in normal hepatic tissues but still kept high concentration in the hepatocarcinoma tissue. Even though concentration of MDA in normal hepatic tissues is higher than that of before ischemia and reperfusion, no difference have been found after perfusion of hyperoxia liquid, and in the hepatocarcinoma tissue, the increasing of concentration of MDA was obvious after simply ischemia and reperfusion at reperfusion 1 d （4.25±0.45）. The concentration of NO in normal hepatic tissues increased for reperfusion 3 d and 7 d（18.17±0.13, 17.45±0.23）,while that of hepatocarcinoma tissue decreased at reperfusion 3 d（15.95±043）. After perfusion of hyperoxia liquid, the concentration of NO in normal hepatic tissues kept increasing and that decreased in the hepatocarcinoma tissues in all time point and reached the lowest level at reperfusion 1 d（14.62±0.45）.The result demonstrated the changes of concentration of NO and MDA in the hepatocarcinoma tissues ware more obvious than that of normal hepatic tissues（P<0.01）. Conclusion:Perfusion of hyperoxia liquid from hepatic portal vein can intensify ischemia and reperfusion injury but less so for normal hepatic tissues.0|19|0Updated：2026-03-12
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Repair of articular cartilage defects in minipigs by microfracture surgery and BMSCs transplantation
Abstract：Objective:To investigate the feasibility of minimal invasive repair of cartilage defect by arthroscope-aided microfracture surgery and autologous transplantation of mesenchymal stem cells. Methods: Bone marrow of minipigs was taken out and the bone marrow derived mesenchymal stem cells （BMSCs） were isolated and cultured to passage 3. Then 6 minipigs were randomly divided into 2 groups with 6 knees in each group. After the articular cartilage defect was induced in each knee, the left defect received microfracture surgery and was injected with 2.5 ml BMSCs cells at a concentration of 3×107 cells/ml into the articular cavity; while right knee got single microfracture or served as blank control group. The animals were killed at 8 or 16 weeks, and the repair tissue was histologically and immunohistochemically examined for the presence of type Ⅱ collagen and glycosaminoglycans （GAGs） at 8 and 16 weeks. Results: Eight weeks after the surgery, the overlying articular surface of the cartilage defect showed normal color and integrated to adjacent cartilage. And 16 weeks after surgery, hyaline cartilage was observed at the repairing tissues and immunostaining indicated the diffuse presence of this type Ⅱ collagen and GAGs throughout the repair cartilage in the treated defects. Single microfracture group had the repairing of fibrocartilage, while during the treatment, the defects of blank group were covered with fewer fiber tissues, and no blood capillary growth or any immunological rejection was observed. Conclusion: Microfracture technique and BMSCs transplantation to repair cartilage defect is characterized with minimal invasion and easy operation, and it will greatly promote the regeneration repair of articular cartilage defect.0|21|2Updated：2026-03-12 - Abstract：Objective:To study whether adenovirus-mediated human β-nerve growth factor （Ad-hNGFβ） gene has any protective effect on blast hearing impairment. Methods:Deafness was induced by blast exposure （172.0 dB） in 30 healthy guinea pigs. On day 7 of blast exposure, Ad-hNGFβ was infused into the perilymphatic space of 20 animals as the study group （hNGFβ group）, and artificial perilymph fluid （APF） was infused into the perilymphatic space of the other 10 animals as the control group. At weeks 1, 4 and 8 after blast exposure, the animals were sacrificed and the cochleae were removed for immunohistochemical and HE stainings. Results: Expression of Ad-hNGFβ protein was detected in each turn of the cochlea at the 1st week, with almost equal intensity in all turns. At the 4th week, the reactive intensity of the expression of Ad-hNGFβ protein decreased. At the 8th week, no expression was detectable. The results of HE staining showed that the amount of spiral ganglions in hNGFβ group was significantly greater than that of the control group at week 4 （P<0.01）. Conclusion: Ad-hNGFβ can be expressed at a high level and for a relatively long period in the blast impaired cochlea, suggesting that Ad-hNGFβ has a protective effect on cochlear spiral ganglion cells after blast exposure and the efficient gene transfer into cochlea had been achieved without toxicity.0|18|3Updated：2026-03-12
- Abstract：Objective:To report the clinical outcome of repairing massive bone defects biologically in limbs by homeochronous using structural bone allografts with intramedullary vascularized fibular autografts. Methods: From January 2001 to December 2005, large bone defects in 19 patients （11 men and 8 women, aged 6 to 35 years） were repaired by structural bone allografts with intramedullary vascularized fibular autografts in the homeochronous period. The range of the length of bone defects was 11 to 25 cm （mean 17.6 cm）, length of vascularized free fibular was 15 to 29 cm （mean 19.2 cm）, length of massive bone allografts was 11 to 24 cm （mean 17.1 cm）. Location of massive bone defects was in humerus（n=1）, in femur（n=9） and in tibia（n=9）, respectively. Results: After 9 to 69 months （mean 38.2 months） follow-up, wounds of donor and recipient sites were healed inⅠstage, monitoring-flaps were alive, eject reaction of massive bone allografts were slight, no complications in donor limbs. Fifteen patients had the evidence of radiographic union 3 to 6 months after surgery, 3 cases united 8 months later, and the remained one case of malignant synovioma in distal femur recurred and amputated the leg 2.5 months, postoperatively. Five patients had been removed internal fixation, complete bone unions were found one year postoperatively. None of massive bone allografts were absorbed or collapsed at last follow-up. Conclusion: The homeochronous usage of structural bone allograft with an intramedullary vascularized fibular autograft can biologically obtain a structure with the immediate mechanical strength of the allograft, a potential result of revascularization through the vascularized fibula, and accelerate bone union not only between fibular autograft and the host but also between massive bone allograft and the host.0|14|1Updated：2026-03-12
- Abstract：Objective:To assess the biomechanical properties of a new design configuration for zirconia dental implants. Methods: The new design has a cylindrical shape that is partially hollow and porous in the bottom, which permits the implants to be locked into the alveolar bone over time. It also utilizes bioactive glass coatings to increase adhesion to surrounding bone structure. Samples of the new design were fabricated in the laboratory and their material strength, hardness, and fracture toughness were evaluated. In addition, biocompatibility of the new design was evaluated through testing in dogs. Results: Results of mechanical tests indicate that structural properties of the new design exceed the usual requirements for implants. Moreover, animal tests suggest that there is appreciable improvement in lock-in strength and osteointegration. Conclusion: The new design configuration is biomechanically feasible and further research is warranted to improve the design for human use.0|27|1Updated：2026-03-12
- Abstract：Objective:To perform a systematic review and meta analysis on the association of C-589T and C-590T polymorphisms of IL-4 with asthma and to estimate allele frequencies, the magnitude of the gene effect as well as the possible mode of inheritance. Methods: A genetic model-free approach was used to perform a meta analysis. Heterogeneity, sensitivity analysis and publication bias were also explored. Results: Our meta analysis summarized the evidence to date regarding the association of C-589T and C-590T polymorphisms in the promoter region of IL-4 gene with asthma. For C-590T, the results showed a significant recessive genetic model, and the CC genotype was about 24% less likely to have asthma than the genotype CT and TT. Although there was evidence suggesting a recessive genetic model for C-589T, the recessive model was not statistically significant. Conclusion: This meta analysis suggests that there may be an important effect of single nucleotide polymorphisms （SNPs） in the promoter region of IL-4 gene on the pathogenesis of asthma.0|38|3Updated：2026-03-12
- Abstract：Current hypotheses of pathogenesis of neuronal degeneration in Alzheimer’s disease （AD） have been proposed, including formation of free radicals, oxidative stress, mitochondrial dysfunction, inflammatory processes, genetic factors, environmental impact factors, apoptosis, and so on. Especially, oxidative stress plays an essential role in AD pathogenesis by the function of linking agent. Oxidative stress in AD mainly includes lipid peroxidation, protein oxidation and DNA oxidation. Lipid peroxidation plays a key role in the development and progression of AD. Protein oxidation is an important mechanism in AD. Oxidative damage to DNA may plays an important role in aging and AD.0|54|0Updated：2026-03-12
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