BACKGROUND: Researches show that erythropoietin (EPO) can stimulate the proliferation and protraction of endothelial progenitor cells to form new vessels, so EPO may play an important role in proliferation and differentiation of bone marrow-derived mesenchymal stem cells (MSCs). OBJECTIVE: To explore the effects of EPO on the proliferation and cell cycle of MSCs. DESIGN, TIME AND SETTING: From July to November 2007, the observation of comparative cell trial was performed at the Hematologic Diseases Institute of General Hospital Lanzhou Military Area Command of Chinese PLA. MATERIALS: Bone marrow liquid specimens were provided by voluntary donors. The informed consents were obtained from all patients, and the experiment was approved by Hospital Ethics Committee. METHODS: Using Percoll solution, MSCs were isolated from bone marrow by the method of density centrifugation. Flow cytometry was applied to detect the cell cycles of the second and third passages. MSCs were incubated with different doses of EPO (0.25, 0.50, 1.00, 2.00, 5.00 U/mL) in serum free culture media, and cells cultured with no EPO were regarded as control. All cells were cultured for 24, 48, and 72 hours. MAIN OUTCOME MEASURES: ①Proliferation of MSCs was measured by MTT assays after 24, 48, and 72 hours; ②Cell cycle was measured by flow cytometry assays after incubated with 10 U/mL EPO for 72 hours. RESULTS: After MSCs was incubated with EPO, the cell proliferation index was significantly increased in a dose and time dependent manner. The effects on the proliferation of MSCs were highest in 5 U/mL group. Compared with the control group, EPO could significantly decrease G0 /G1 ratio, and increase S and G2/M stage ratio (P

Objective To investigate the therapeutic effects of mesenchymal stem cells (MSCs) on N-methyl-N-nitrosourea (MNU)-induced retinal degeneration in C57BL mice.Methods Different doses of MNU (30 mg · kg-1,45 mg · kg-1,60 mg · kg-1,75 mg · kg-1 and 90 mg · kg-1) were injected to C57BL mice for 7 days.Then electroretinogram (ERG) detection and HE staining were performed to examine retinal electrophysiological function and morphological changes on day 1,day 3 and day 7 after MNU treatment,respectively.Then we could explore the optimum condition to establish stable animal model of retinitis pigmentosa.MSCs were transplanted to C57BL mice by intravitreal or tail intravenous injection.Then ERG detection and HE staining were performed to evaluate the effect of MSCs on retinitis pigmentosa induced by MNU.Results When compared with control group,30 mg · kg-1 and 45 mg · kg-1 MNU could cause mild retinal damage in morphology and function in mice;while 60 mg · kg-1 and above dose of MNU induced serious retinal damage,leading to decreased ERG amplitude of the retina (all P ＜ 0.001) and outer nuclear layer (ONL) thickness (all P ＜ 0.001).On day 1 and day 3 after single dose of 60 mg · kg-1 MNU injection,ERG amplitude of the retina was decreased,and outer nuclear layer thickness became thin;while the retinal damage was serious badly in morphological structure on day 7,with the ERG amplitude extinguished (all P ＜ 0.001),ONL thickness thin (all P ＜ 0.001) and internal and external nuclear layer fusion.When compared with MNU alone treatment group,following injection of 60 mg · kg-1 MNU for 1 day MSCs were transplanted to C57BL mice by intravitreal or tail intravenous injection,and the amplitude of ERG and retinal ONL thickness were increased on day 7 after MSCs transplantation (all P ＜ 0.001).Conclusion MSCs transplantation has a certain therapeutic effect on MNU-induced retinitis pigmentosa in C57BL mice.

BACKGROUND: Endothelial colony-forming cells (ECFCs) transplantation exerts beneficial impact on angiogenesis of impaired tissues caused by ischemia. However, whether this impact is related to the paracrine effect of ECFCs needs to be studied further.OBJECTIVE: To detect the cytokine secretion profile of human umbilical cord blood derived-ECFCs conditioned medium (ECFCs-CM) and explore the effect of ECFCs-CM on the proliferation, migration and tube formation ability of human umbilical vein endothelial cells (HUVECs).METHODS: Human cord blood derived-ECFCs were isolated, cultured in vitro, and then identified based on the previous studies. The cytokines in serum free ECFCs-CM were detected using a cytokines antibody array. HUVECs were cultured with ECFCs-CM, serum free EBM-2 as control. The proliferation, migration and tube formation abilities of HUVECs were examined by cell counting kit-8, scratch test and Matrigel assay, respectively.RESULTS AND CONCLUSION: The cultured cells demonstrated typical characteristics of ECFCs, which showed cobblestone appearance and were positive for CD34, KDR and CD144, but not CD45 or CD133, uptook Dil-acLDL and bond FITC-UEA-I, and tube-like structures were formed on Matrigel. The cytokine antibody array showed that ECFCs-CM significantly upregulated the expressions of 30 kinds of angiogenic factors. Compared with the control group,the HUVECs cultured with ECFCs-CM showed significantly improved proliferation ability at 24, 48 and 72 hours (P <0.01). The migration rate of HUVECs in the experimental group was significantly higher than that in the control group at 12 and 24 hours (P < 0.01). There were more tubular structures in the experimental group than those in the control group (P < 0.05). These results indicate that ECFCs can promote the bioactivity of mature endothelial cells through paracrine action.

As in the building of deep buried long tunnels, there are complicated conditions such as great deformation, high stress, multi-variables, high non-linearity and so on, the algorithm for structure optimization and its application in tunnel engineering are still in the starting stage. Along with the rapid development of highways across the country, It has become a very urgent task to be tackled to carry out the optimization design of the structure of the section of the tunnel to lessen excavation workload and to reinforce the support. Artificial intelligence demonstrates an extremely strong capability of identifying, expressing and disposing such kind of multiple variables and complicated non- linear relations. In this paper, a comprehensive consideration of the strategy of the selection and updating of the concentration and adaptability of the immune algorithm is made to replace the selection mode in the original genetic algorithm which depends simply on the adaptability value. Such an algorithm has the advantages of both the immune algorithm and the genetic algorithm, thus serving the purpose of not only enhancing the individual adaptability but maintaining the individual diversity as well. By use of the identifying function of the antigen memory, the global search capability of the immune genetic algorithm is raised, thereby avoiding the occurrence of the premature phenomenon. By optimizing the structure of the section of the Huayuan tunnel, the current excavation area and support design are adjusted. A conclusion with applicable value is arrived at. At a higher computational speed and a higher efficiency, the current method is verified to have advantages in the optimization computation of the tunnel project. This also suggests that the application of the immune genetic algorithm has a practical significance to the stability assessment and informationlzation design of the wall rock of the tunnel.

Objective:To evaluate the effectiveness and safety of using apatinib in the treatment of refractory triple-negative advanced breast cancer. Methods:Eight cases of advanced triple-negative breast cancer patients confirmed via histopathology, who were previously treated with anthracycline, taxane, gemcitabine, capecitabine, and 500 mg/d apatinib in our hospital from July 2015 to November 2016, were retrospectively analyzed. The time of disease progress, effective rate, clinical benefits, and side effects were observed. Results:Eight patients were administrated with an average of 4 treatment cycles, and the effects were evaluated after 2 weeks. Four patients exhibited partial remission, 3 had a stable disease, and 1 had a progressive disease. The disease control rate was 87.5%, and the median progression free survival was 4.2 months. The main side effects were hand-foot syndrome (3/8), bone marrow arrest (4/8), hypertension (2/8), proteinuria (3/8), hemoptysis (1/8), nausea (2/8), and fatigue (2/8). Most of these side effects were tolerable. Conclusion:Apatinib can effectively and tolerably prolong survival time and improve the quality of life of patients with advanced triple-negative breast cancer.

Objective To examine the effect of endothelial colony-forming cells conditioned medium(ECFCs-CM)on biological function of human dermal fibroblasts(HDFs). Methods Human cord blood derived-ECFCs were isolated and identified based on the previous studies. The cytokines in ECFCs-CM were detected using a cytokines antibody array. HDFs were cultured with ECFCs-CM,using serum free EBM-2 as control. The proliferation of HDFs was examined by Cell Counting Kit-8(CCK-8)and the migration was assessed by scratch test assay. The apoptosis of HDFs was detected by flow cytometry. Results The cells isolated from human cord blood demonstrated typical characteristics of ECFCs. The cytokines antibody array indicated that ECFCs-CM contained large amounts of secreted cytokines such as PDGF-BBand EGF. Compared with the control group,the HDFs cultured with ECFCs-CM showed improved proliferation and migration ability. The number of apoptotic cells was smaller than that of the control group under the environment of serum starvation. Conclusion ECFCs-CM can promote the proliferation and migration of HDFs and inhibit the apoptosis of HDFs under the environment of serum starvation.

Objective To discuss the efficacy and safety of sterile repositionable hemostasis clipping device in combination with high frequency electric snare in polypectomy of colorectal polyps with wide and long peduncle. Methods From January 2014 to December 2015, 21 cases of colorectal polyps with wide and long peduncle (diameter greater than 2 cm) in endoscopic treatment under electronic colonoscopy. We used 1 ~ 2 hemostatic clips to clip colorectal polyps roots, then used electric resection with high frequency electric snare electric coagulation. Postoperative bleeding, perforation were observed follow-up. Results 24 polyps in 21 cases were removed one-time successfully. Stump errhysis in 1 case, hot biopsy forceps is given to deal with local wound followed by Olympus Clip HX-610-135L EZ titanium clip. There was no complication such as bleeding and perforation in 3 to 6 months after the operation. In the colonoscopy examination, recurrence of polyps were not found in the original polyp resection site. Conclusion Sterile repositionable hemostasis clipping device in combination with high frequency electric snare in polypectomy of colorectal polyps with wide and long peduncle is safe and effective, without bleeding or perforation.

0.05). The rFA2 values were higher and rFA3 were lower in high grade gliomas than that in low grade and had significant difference (respectively t=2.453, P

BACKGROUND: No particular marker molecule of bone marrow mesenchymal stem cells (BMSCs) is presently found, so its determination is difficult. BrdU marker has no radioactive pollution. Some studies have confirmed that BrdU marker has no damage to cell function without ultraviolet radiation. OBJECTIVE: To investigate in vitro identification and labeling methods and biological characteristics of adult BMSCs. DESIGN, TIME AND SETTING: The cell experiment was conducted at the General Hospital of Lanzhou Military Area Command of Chinese PLA between June and December 2007. MATERIALS: Bone marrow was collected from 5 healthy adult volunteers. BrdU was purchased from Sigma, USA. METHODS: 10 mL adult bone marrow was harvested to isolate mononuclear cells by density gradient. Cells were cultured in DMEM containing 10% fetal bovine serum and proliferated at a density of 2?108 L-1. At the third passage, BMSCs was inoculated in medium supplemented with osteoblast inductor and stained with alkaline phosphatase. Subsequently, BMSCs were inoculated in medium supplemented with lipoblast inductor and stained with oil red O. Cells were incubated with BrdU at different concentrations of 5, 10 and 15 ?mol/L for 12, 24, 48, 72 and 96 hours, and then detected by immunocytochemistry. MAIN OUTCOME MEASURES: Cell growth and proliferation were observed under an inverted light microscope. Cell phenotype, osteoblast and lipoblast differentiation were identified by flow cytometry. BrdU-positive labeling rate and cell growth after labeling were investigated. RESULTS: In vitro cultured BMSCs were homogenous population and exhibited a spindle-shaped fibroblastic morphology. BMSCs expressed CD44 and CD71, but did not express CD34 and HLA-DR. BMSCs can differentiate into osteoblasts and lipoblasts. Most BMSCs were labeled by BrdU. With the increase in labeling concentration and over time, BrdU positive rate gradually increased and exceeded 90% after labeling with BrdU (10 ?mol/L) for 72 hours, with the labeling identifiable in nine consecutive passages. At the third passage, 90% BMSCs were in G0/G1 phase, and 88.62% in G0/G1 phase after labeling. BrdU has little effect on morphous and proliferation of labeled cells. CONCLUSION: Adult BMSCs can be identified through morphological character, specific surface antigens and multipotential differentiation in vitro. BrdU labeling provides a feasible means for a dynamic observation of the survival, growth and differentiation of the implanted BMSCs. The optimal dosage and timing of BrdU labeling are respectively 10 ?mol/L and 72 hours.

Objective To study the effects of cultivation methods on growth dynamics in the aerial part and root of Angelica sinensis and Ditylenchus destructor, rate of early bolting, and yield of A. sinensis as well. Methods Compared with conventional planting, ridge planting, furrow planting, white plastic mulch coverage, and black plastic mulch coverage were used to evaluate the effects of cultivation methods on dry matter accumulating and growth dynamics of A. sinensis. Results The influence of black plastic mulch coverage to growth dynamics of A. sinensis is the biggest, next for white plastic mulch coverage. There is the best inhibition to D. destructor under ridge planting. Black plastic mulch coverage can enhance the rate of early bolting. The treatment of black plastic mulch coverage has the highest yield, which can increase the yield by 33.4% (4 650 kg/hm2) compared to conventional planting; next for the treatment of white plastic mulch coverage, which increased the yield by 24.3% (3 372.2 kg/hm2) compared to conventional planting. But there were no significant effects of ridge planting and furrow planting on increasing yield. Conclusion The cultivation methods of black plastic mulch coverage should be brought into wide use in A. sinensis cultivation.