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BACKGROUND:Collagen-bioglass-polycaprolacton (COL-BG-PCL) composites have good biocompatibility, mechanical properties and biodegradability that are beneficial to cell adhesion, proliferation and angiogenesis. OBJECTIVE:To study the effect of COL-BG-PCL bioactive scaffold on the proliferation, migration and differentiation of human dental pulp cells (hDPCs). METHODS:hDPCs were isolated and cultured on the COL-BG-PCL bioactive scaffold. MTT, cell scratch test and enzyme-linked immunosorbent assay (ELISA) assay were used to detect the proliferation, migration and differentiation abilities of hDPCs before and at 1, 3, 7, 14, 24 days after inoculation onto the COL-BG-PCL bioactive scaffold. RESULTS AND CONCLUSION:Compared with the cells without inoculation onto the COL-BG-PCL bioactive scaffold, (1) the proliferation ability of the cells cultured on the COL-BG-PCL scaffold was significantly enhanced (P<0.01), and with the prolongation of the inoculation time, the cell proliferation ability was gradually increased; (2) the cell migration ability of the cells cultured on the COL-BG-PCL scaffold was significantly enhanced (P<0.01), and with the prolongation of the inoculation time, the migration ability of the cells cultured on the COL-BG-PCL scaffold was gradually increased; (3) the level of alkaline phosphatase in the supernatant of the cells cultured on the COL-BG-PCL scaffold was significantly increased (P<0.01), and with the prolongation of the inoculation time, the level of alkaline phosphatase in the supernatant was gradually increased. In summary, the COL-BG-PCL scaffold can promote the proliferation, migration and differentiation of hDPCs.
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Objective To investigate correlation between seizures and uric acid level in the hippocampus in a mouse model with acute limbic seizures by pharmacological and genetic method. Methods Normal male C57BL/6 and mutant mice were used in this study,including urate oxidase overexpression (UOx-OE) and urate oxidase knock-out (UOx-KO) ;These mice were divided into the following groups,including the control,KA, All ,OE ,KO group respectively;during the experiment ,behaviors ,latency and duration time were recorded;dialysates were collected by microdialysis technique and uric acid level was detected by FPLC;Uric acid in the hippocampus,seizures status,latency and duration were compared. Results Twenty-four mice in total were enrolled and only 1 death occurred until the end of the study. Seizures state appeared after KA treatment. Compared to the KA group,uric acid and generalized seizures declined by the treatment of KA and All (P 0.05). Conclusions Uric acid level in the hippocampus of mice may have effects on seizures ,in which it suggests that uric acid and its relevant signal pathway could be a potential therapy target in seizures clinically.
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BACKGROUND:The hip is a complicated structure and irregular in shape. It is hard to measure stress distribution and transmission. OBJECTIVE:To establish a three-dimensional finite element model of the hip joint and upper femur, and analyze the stress distribution and transmission characteristics of the acetabulum region under different loads, and explore mechanics mechanism of hip fracture based on CT data. METHODS:The three-dimensional finite element hip and femur model were reconstructed in Mimics 14.0 based on the CT data of a healthy adult man. After dividing mesh, assigning material and transforming into finite element model, the stress distributions of anterior wal , the top, and the posterior wal of the acetabulum, the stress of acetabulum areas and displacement of acetabular unit were calculated with finite element software Ansys 13.0 software under 300, 600, 900 and 1 200 N. RESULTS AND CONCLUSION:(1) A three-dimensional finite element model of the hip and the femur was successful y established, consisting of 284 183 nodes and 160 665 units. (2) The characteristics of the stress distribution of acetabulum region:the maximal stress was concentrated on the posterosuperior part of acetabular crest, fol owed by the posterior wal and the anterior wal in order in upright position under different loads. The stress transmitted by four ways:from acetabular crest to ilium, along linea terminalis of pelvis to sacroiliac joint, in the acetabular sockets, and along the pubic ramus. The stress and the propagation distance were increasing as the loads increased. Acetabular element stress variable was increased. (3) Above results indicated that three-dimensional finite element model of the human hip joint established by Mimics 14.0 based on CT data matches the anatomical structure in a great degree, could be used in the biomechanics analysis under different loads, and has a guiding significance for design of artificial hip prosthesis.
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BACKGROUND:In recent years, increasing research emphasizes the puncture position of the foramen ovale in skul , but most of the positin methods require a higher personal experience of surgeons and lack of individualized quantitative parameters. OBJECTIVE:To establish a visualized digital model of the foramen ovale in skul , explore the reasonable puncture path and puncture depth of percutaneous treatment of foramen ovale puncture for trigeminal neuralgia, and develop the individualized treatment of trigeminal neuralgia. METHODS:Head CT images from healthy adult male volunteers were obtained and were input into three-dimensional reconstruction software MIMICS 10.01, the three-dimensional visualized models of the skul and skin were established. Using the models, the puncture path of the foramen ovale was designed and the preliminary model of the puncture locator was plotted. RESULTS AND CONCLUSION:The three-dimensional visualized digital model of the foramen ovale puncture path was established with CT scan images by using MIMICS software, which provides reliable anatomical data for clinical teaching and lays the groundwork for the simulation of puncture surgery. On the three-dimensional models, the“needle points”,“target points”, and“midpoint”were determined, and the triangle consisted of the three points was regarded as“positioning plane”. Using these parameters, the positioning instrument is characterized by simple structure, convenient operation, high positioning precision and short period of exposure to radiation, it simulates the foramen ovale puncture needle depth and needle direction in a precise and individualized manner.
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<p><b>INTRODUCTION</b>The aim of this study was to compare the knowledge and practices of household mosquito-breeding control measures between a dengue hotspot (HS) and a non-hotspot (NHS).</p><p><b>MATERIALS AND METHODS</b>Eight hundred households were randomly sampled from HS and NHS areas, and an National Environment Agency (NEA) questionnaire was administered to heads of the households. Interviewers were blinded to the dengue status of households. We included subjects aged above 16 years, who were communicative and currently living in the household. Chi-square test was used to compare proportions and multiple logistic regression was used to adjust for socio-demographic differences between both areas.</p><p><b>RESULTS</b>The overall response rate was 59.0% (n = 472). There were significant differences in gender, educational level, employment status and housing type between HS and NHS (all P <0.05). NHS residents were less knowledgeable in 6 out of 8 NEA-recommended anti-mosquito breeding actions: changing water in vase/bowls [AOR (adjusted OR), 0.20; CI, 0.08-0.47; P <0.01], adding sand granular insecticide to water [AOR, 0.49; CI, 0.31-0.71; P <0.01], turning over pails when not in use [AOR, 0.39; CI, 0.17-0.89; P = 0.02], removing flower pot/plates [AOR, 0.35; CI, 0.18-0.67; P <0.01], removing water in flower pot/plates [AOR, 0.36; CI, 0.17-0.75; P <0.01] and putting insecticide in roof gutters [AOR 0.36; CI, 0.13-0.98; P = 0.04]. Hotspot residents reported better practice of only 2 out of 8 NEA-recommended mosquito-breeding control measures: changing water in vases or bowls on alternate days [AOR, 2.74; CI, 1.51-4.96; P <0.01] and removing water from flower pot plates on alternate days [AOR, 1.95; CI, 1.01-3.77; P = 0.05].</p><p><b>CONCLUSION</b>More HS residents were knowledgeable and reported practicing mosquito-breeding control measures compared to NHS residents. However, a knowledge-practice gap still existed.</p>