Wei-dong Tian

Sichuan University, Hua-yang, Sichuan, China

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Publications (51)18.1 Total impact

  • Pei-yong Tan · Jin-huan Chen · Peng Li · Ji-xiang Guo · Wei Tang · Jie Long · Lei Liu · Wei-dong Tian ·
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    ABSTRACT: To develop a new threshold segmentation method for mandible image segmentation. CT data of 12 volunteers were exported into Mimics 10. 01. An improved method usinga narrowed threshold range (the maximum threshold range that can segment mandible without manual efforts) was developed in 3D reconstruction, and compared with the traditional method. We used dilation operations to make up the information loss of image borders, by which we obtained an approxinate segment result. A precise segment resultwas eventually arrived with the help of logical operations and region growing. We compared mean time consumptions of the two methods, as well as their 3D reconstruction results using Geomagic Studio 11. 0. The new method generated a success rate of 91. 67% (11/12), with a mean time consumption of (319. 7±125. 3) s. The traditional method took much longer time [(1,261. 3±427. 3) s, P<0. 05] than the new method. Compared with the reconstruction results of traditional method, the new method had an outward deviation of (0. 066±0. 011) mm and an inward deviation of (0. 070±0. 008) mm. Such deviations were less than the minimum distance that a naked eye can discern. The lower limit of the widest threshold range which mandible could be isolated was (507. 72± 100. 31) HU, while the upper limit was (1,133. 33±47. 57) HU. The new method we proposed can improve the efficiency of threshold segmentation of mandible.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 05/2015; 46(3):458-62.
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    ABSTRACT: This study investigates the effects of the Wnt signaling pathway on the osteogenic differentiation of human adipose-derived stem cells (hASCs) under tensile stress. hASCs cultured in vitro were divided into 4 groups: Group A, hASCs; Group B, Wnt5a RNAi-treated hASCs; Group C, hASCs under tensile stress; and Group D, Wnt5a RNAi-treated hASCs under tensile stress. Five days after treatment, the genes associated with the Wnt/β-catenin and Wnt/Ca2+ pathways were analyzed in all groups by real-time RT-PCR; the Wnt10b, Wnt5a, RUNX2 and SPP1 proteins were analyzed by western blot analysis. Compared with the expression in Groups A and B, all the genes and proteins in Groups C and D had higher expression, except for Wnt5ain Group D. Compared with Group C, Wnt5a, RhoA ,RUNX2 and ALPL had lower expression in Group D, but the markers associated with Wnt/β-catenin had higher expression. The results suggest that tensile stress can promote maturation and osteogenic differentiation in hASCs and also activate the Wnt/β-catenin and Wnt/Ca2+ pathways. The Wnt/Ca2+ pathway may have the potential to inhibit the Wnt/β-catenin pathway. Wnt5a knock down seemed to increase the expression of the Wnt/β-catenin pathway, which is activated by Wnt10b.
    Journal of Hard Tissue Biology 04/2015; 24(2):169-180. DOI:10.2485/jhtb.24.169 · 0.32 Impact Factor
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    ABSTRACT: The purpose of this study was to investigate the osteogenic response of human adipose-derived stem cells (hASCs) under mechanical and/or chemical stimulation. hASCs were divided into three groups. In group A, the cells were cultured without any stimulation, in group B, the cells were induced with chemical stimulation, and in group C, the cells were induced with a combination of chemical stimulation and stretch loading. Stretch loading and chemical stimulation were applied using a four-point bending apparatus (0.5 Hz, 2,000 µε, 2 h/day) and osteogenic differentiation medium, respectively. At the 1st, 2nd, 3rd, 5th and 7th day following initiation of stretch loading, we detected alkaline phosphatase activity, mRNA expression (RUNX2, ALPL, osteonectin, osteopontin and type I collagen) and protein expression (RUNX2 and osteopontin) by colorimetric assay, real-time PCR and Western blot methods, respectively. Alkaline phosphatase activity, mRNA expression and protein expression all increased in groups B and C along with the culture time, but were observed to be downregulated by the 7th day in group C (p < 0.05). Compared to group A, most of the above markers were significantly higher in groups B and C (p < 0.05). All of the above markers in group C were higher than those in group B before the 5th day (p < 0.05), except at the 1st day. These results indicated that stretch loading promoted osteogenic differentiation of hASCs and that the combination of mechanical and chemical stimulation could enhance the osteogenic capability up to the 5th day relative to chemical stimulation alone.
    Cells Tissues Organs 05/2012; 196(4):313-24. DOI:10.1159/000335905 · 2.14 Impact Factor
  • Qin-ce Sun · Jin-gang Xiao · Xiao-juan Yang · Wei-dong Tian ·
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    ABSTRACT: To investigate PPARgamma2 expression and phosphorylation involved in adipogenic differentiations of Adipose-derived Stem Cells (ASCs) with an aim to reveal the possible mechanisms of adipose development. ASCs were obtained from the inguinal fat pads of GFP (green fluorescent protein) mice. The primary cells were cultured in histiocytic attachment cultivation. Adipogenic differentiation of the third generation of ASCs was induced with the conditional medium (alpha-MEM medium supplemented with 100 mL/L fetal bovine serum, 10(-6) mol/L dexamethasone, 10(-5) mol/L insulin, 0. 2 mmol/L indomethacin, and 0.5 mmol/L 3-isobutyl-1-methylxanthine). The levels of PPARgamma2 mRNA and the PPARgamma2 expression and phosphorylation at day 0, 1, 3, 5, 7, and 9 of induction were detected using RT-PCR, fluorescence-immunocytochemistry and western blot, respectively. The expression of PPARgamma2 and phosphorylation were significantly up-regulated during adipogenic differentiation of ASCs. PPARgamma2 is the key regulator of adipose development. The regulation of PPARgamma2 phosphorylation may promote adipogenic differentiation of ASCs.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 01/2011; 42(1):10-4.
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    ABSTRACT: We investigated the effect of recombinant human bone morphogenetic protein 2 (rhBMP-2) on new bone formation during rapid-rate mandibular distraction osteogenesis. We also explored the feasibility of using local BMP-2 gene therapy to compensate for bad callus formation caused by a rapid distraction rate. Bone marrow mesenchymal stem cells (MSCs) from Japanese rabbits were transfected with adenovirus (adv)-BMP-2. The right mandibles of the rabbits were distracted after corticotomy. The distraction rate in group A was 0.8 mm/d. The distraction rate in group B was 2.4 mm/d, and the distraction gap was injected with adv-lacZ-transfected bone marrow MSCs. The distraction rate in group C was 2.4 mm/d, and the distraction gap was injected with adv-BMP-2-transfected bone marrow MSCs. New generation bone tissue in the distraction gap was analyzed by plain radiograph examinations, microfocus computerized tomography (micro-CT) examinations, and biomechanical tests at weeks 2, 4, and 8 of the consolidation period. Radiographic and micro-CT examinations showed a better bone quality in group C compared with group A at weeks 2 and 4 of the consolidation period. There was no obvious new bone formation in group B. The trabecular parameters (trabecular thickness, trabecular number, volumetric bone mineral density at tissue, and bone volume fraction) were significantly higher in group C than in group A at weeks 2 and 4. At week 8, no significant difference were detected for all parameters except trabecular number between groups A and C. All biomechanical stress parameters were significantly higher in group C than in group A at week 4, and only peak stress was significantly different at week 8. Gene therapy using rhBMP-2-modified MSCs promoted new bone formation during mandibular distraction osteogenesis, and effectively compensated for the detrimental effect of rapid distraction rate on new bone formation.
    Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 12/2010; 112(1):50-7. DOI:10.1016/j.tripleo.2010.09.065 · 1.46 Impact Factor
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    ABSTRACT: To construct mouse enhanced green fluorecence protein (EGFP) -peroxisome proliferator-activated receptor (PPAR)gamma2, and to detect EGFP-PPARgamma2 expression in infected mouse bone marrow mesenchymal stem cells (BMSC). Cut the fragment of PPARgamma2 from the expression plasmid pcDNA flag PPARgamma2, then cloned the gene fragment into pEGFP-C1 and pEGFP-N1 vector. Subsequently, subclone the fragment EGFP-PPARgamma2 from pEGFP-C1-PPARgamma2 into the shuttle plasmid DC315. HEK293 cells were co-transfected with the constructed recombinant shuttle plasmid DC315-EGFP-PPARgamma2 and large adenovirus helper plasmid pBHGlox deltaE1, 3Cre in mediation of liposome. The obtained replication-defective recombinant adenovirus Ad-EGFP-PPARgamma2 was confirmed. Then it was propagated in HEK293 cells. After the BMSC were transfected for 72 h, adipogenic differentiation was demonstrated. HEK293 cells were transfected with the pEGFP-C1-PPARgamma2 or pEGFP-N1-PPARgamma2 in mediation of liposome. The former green fluorescence protein was better than the latter by fluorescence microscope. The recombinant plasmids were digested and identified. Western blot analysis showed the expression of EGFP-PPARgamma2 in vitro. EGFP-PPARgamma2 protein was detectable in the nucleus of BMSC. The recombinant adenovirus encoding EGFP-PPARgamma2 fusion protein was successfully constructed, which provided a basis for application of EGFP-PPARgamma2 gene to adenovirus-mediated gene therapy.
    Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology 08/2010; 28(4):430-4.
  • Jie Long · Wei Tang · Yu-bo Fan · Wei-dong Tian · Fan Feng · Lei Liu · Xiao-hui Zheng · Wei Jing · Ling Wu ·
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    ABSTRACT: Distraction osteogenesis typically requires a long treatment period, which can lead to bone and soft-tissue infection and considerable patient discomfort. Use of a rapid distraction rate in craniofacial distraction osteogenesis to shorten the distraction period is possible owing to the unique characteristics of craniofacial bones, including an abundant blood supply and rapid bone healing compared with long bones. The effects of using a rapid distraction rate in the treatment of craniofacial deformities are currently unclear, however. The objective of this study was to investigate the effects of a rapid distraction rate on new bone formation during mandibular distraction osteogenesis in goats. Sixteen goats were randomly divided into four groups consisting of four goats each. In Groups A, B, and C, the right mandible of each goat was distracted at a rate of 0.8mm/d, 1.6mm/d, and 2.0mm/d, respectively; Group D was the control group and did not undergo distraction. Six weeks after the conclusion of distraction, bone densitometry and three-point bending testing were performed in all groups. The mean bone density value of goats in Group A was significantly higher than those of all the other groups (p<0.05), and the mean bone density value of goats in Group C was significantly lower than those of all the other groups (p<0.05). The mean curve slope, peak stress, bending modulus, and energy to failure values of Groups A, B, and C were all significantly lower than those of the control group (p<0.05). As the distraction rate increased, the curve slope and peak stress values gradually declined (p<0.05). Use of a rapid distraction rate in mandibular distraction osteogenesis may have detrimental effects on the quality of new bone, despite the abundant blood supply of craniofacial bones.
    Injury 02/2009; 40(8):831-4. DOI:10.1016/j.injury.2008.09.011 · 2.14 Impact Factor
  • Yong-dai Shen · Yong-hong He · Lin Yang · Wei Tang · Lei Liu · Wei-dong Tian ·
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    ABSTRACT: To identify the expression of antagonist beta-TrCP protein in Sonic hedgehog signal transduction pathway and Wnt signal transduction pathway in hair follicle tissues. The heads of day 18 embryo, and one day and six-days-old postnatal mice were acquired and treated with 40 g/L paraformaldehyde fixation for 48 h and paraffin embedding. The expression of beta-TrCP proteins was examined using LsAB (labelled streptavidin-biotin) method. beta-TrCP proteins were expressed in the cytoplasm of the hair stems of hair follicle, hair cuticle, cuticle of root sheath, Huxley's layer of internal root sheath cells, external root sheath and mesenchymal tissues, but not in connective tissue sheath and Henle's layer of internal root sheath. TrCP express in the developmental hair follicle tissues, which implicates that beta-TrCP regulate the developmental hair follicle by mediating the signal transduction pathways.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 08/2008; 39(4):612-4.
  • Hong-Bing Jiang · Wei-Dong Tian · Lai-Kui Liu · Yan Xu ·
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    ABSTRACT: During tooth development, cranial neural crest (CNC) cells represent a population of pluripotent stem cells that give rise to various dental tissues. This study aimed to investigate whether CNC cells could differentiate into odontoblast-like cells by in vitro induction. CNC cells were isolated from explants of cranial neural tubes and cultured in serum-free Dulbecco's modified Eagle's medium (DMEM)/F12 medium which contained fibroblast growth factor 8 (FGF8) and dentin non-collagen proteins (DNCP). The initiation of controlled differentiation was determined using histological assays, and the expression of specific gene phenotypes was detected using immunocytochemical staining and reverse transcription--polymerase chain reaction (RT--PCR). The first branchial arch phenotype of the CNC cells demonstrated negative Hoxa2 expression and positive vimentin expression in the presence of 100 ng/ml FGF8. Following DNCP induction, the CNC cells became bipolar, demonstrated high alkaline phosphatase (ALP) activity, and formed mineralized nodules. In addition, the expression of DSPP, DMP1, and collagen type I confirmed the odontoblast phenotype. The results indicate that the tissue-specific cellular differentiation (odontoblast-like cells) of early-stage embryonic-derived cells (such as CNC cells) can be induced by adult extracellular matrix proteins (such as DNCP). CNC cells may be used as a valuable cell model for research on dental tissue differentiation and regeneration.
    Cell Biology International 07/2008; 32(6):671-8. DOI:10.1016/j.cellbi.2008.01.293 · 1.93 Impact Factor
  • Feng Zhu · Rong-Rong Nie · Ling Wu · Lei Liu · Wei Tang · Wei-Dong Tian ·
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    ABSTRACT: To observe the spontaneous odontogenic differentiation of mouse dental papilla mesenchymal cells in blood serum medium. And to detect the critical gene expression of correlated transcription factors what are specific to odontogenic and osteogenic differentiation. The primary dental papilla mesenchymal cells what had been obtained from E16.5 d murine embryo were serially subcultivated in the simple serum medium and the serum medium supplemented with LIF (leukocyte inhibitory factor) respectively. It was observed whether the dental papilla mesenchymal cells differentiated into odontoblast phenotype or kept the undifferentiation phenotype. The mRNA expression of specific transcription factors were detected in cells with or without odontogenic differentiation. The fourth generation and behind of mouse dental papilla mesenchymal cells what were cultured in simple serum medium could spontaneously differentiate to odontoblast, while the undifferentiation phenotype of dental papilla mesenchymal cells could be lasting to ninth generation when they cultured in medium supplemented with 10(6) U/L LIF. Whether the dental papilla cells differentiate to odontogenic phenotype or not, the members of HOX gene family such as Msx1/Msx2, Pax9 and Lhx6/Lhx7 got completely expression. These transcription factors were specific to odontogenic mesenchymal cells. Also the specific gene of mineralized tissue cells such as DSPP, Sox9, Cbfa1 and Osx initiated to express after the odontoblast differentiation. Not only this spontaneous odontogenic differentiation model of mouse dental papilla mesenchymal cells can be the positive control, but also the mode of gene expression can provide an evidence for studying how gene changes when adult stem cells are induced to odontogenic differentiation.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 03/2008; 39(2):286-9, 297.
  • Feng Zhu · Rong-Rong Nie · Ling Wu · Lei Liu · Wei Tang · Wei-Dong Tian ·
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    ABSTRACT: To observe the overexpression of dentin sialophosphoprotein (DSPP) in mouse bone marrow mesenchymal stem cells (BM-MSC) and the expression of specific gene involved in odontogenic and osteogenic differentiation in transfected cells. Mouse bone marrow mesenchymal stem cells (BM-MSC) were cultured and then transfected with DSPP gene by adenovirus-mediated way in vitro. The transfection efficiency of DSPP gene was assessed by the marker gene green fluorescent protein (GFP). With having observed the morphological transformation of transfected BM-MSC, we studied whether the transfected BM-MSC would express odontogenic and osteogenic genes by RT-PCR. The mouse BM-MSC were obtained and the adenovirus mediated DSPP gene used to transfect BM-MSC successfully. The transfected efficiency was 42.7%. The transfected BM-MSC were induced to differentiate into odontoblast-like cells and meanwhile expressed specific odontogenic and osteogenic differentiation genes such as DSPP, DMP1, Msx1/2, Pax9, Lhx6/7, Sox9, Cbfa1, Osx, Col I. The bone marrow mesenchymal stem cells can make differentiation with the overexpression of dentin sialophosphoprotein and express specific odontogenic and osteogenic differentiation genes.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 03/2008; 39(2):290-3.
  • Xin Nie · Yan Jin · Jie Long · Ling Wu · Wei Jing · Yun-Feng Lin · Wei-Dong Tian ·
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    ABSTRACT: To construct the tissue culture model in vitro, and investigate the potential of dental pulp fibroblast differentiating into the odontoblast and the promoting role of transforming growth factor beta1 (TGF-beta1) on it. Human pulps were cultured for 3, 7, 14 and 21 days on bone matrix gelatin (BMG) in DMEM cultural medium supplemented with TGF-beta1. The characteristics of matrix were studied through toluidine blue and Mallory stain. Meanwhile, the expression of dentin salivary protein (DSP) on the pulp cells was investigated with immunohistochemical staining. This experiment found that the pulp tissue in vitro were able to develop into more progressive stage, and some pulp fibroblast cells to differentiate into odontoblast-like cells. Toluidine blue and Mallory staining analysis revealed the localized deposition of mineralized bone-dentin matrix that was detected at the site of dental pulp cells. Immunohistochemical analysis proved that the DSP synthesized in these cells with the presence of TGF-beta1. The results demonstrate that this culture condition can maintain the phenotype of human pulp tissue. The model of organ culture is suitable to study the development of pulp tissue in vitro. TGF-beta1 can promote the potential of pulp cell into odontoblast, which provides an academic basis for tooth repair and regeneration.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 03/2008; 39(2):283-5.
  • Lin Yang · Yong-Hong He · Yong-Dai Shen · Lei Liu · Wei Tang · Xiao-Hui Zheng · Wei-Dong Tian ·
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    ABSTRACT: To construct recombinant adenovirus carrying the mouse dentin caveolin-1 gene using the recombinant adenoviral vector system AdEasy. The cDNA fragment of caveolin-1 was derived from pTRE2-caveolin-1 by restriction enzyme digestion and subcloned into shuttle plasmid pAdtrack-CMV. The resulting plasmid pAdtrack-CMV-caveolin-1, after linearized by digesting with restriction endonuclease Pme I, was transformed into E. coli 1 BJ5183 which had been transformed by adenoviral backbone plasmid pAdEasy-1. The recombinant plasmid pAd-caveolin-1 was screened by kanamycin LB plate and then identified by restriction enzyme digestion. The linearized adenovirus plasmid pAd-caveolin-1 was packaged in 293 cells, then the recombinant adenovirus Ad-caveolin-1 was harvested. The expression of green fluorescence protein was observed under fluorescent microscope. With further amplification and purification, the titer of recombinant adenovirus was determined. The recombinant adenovirus was identified by restriction enzyme digestion analysis and gene sequencing. Cytopathic effect and the expression of GFP were observed in the infected 293 cells. The sequence of caveolin-1 gene insert was the same as that published in the GenBank. The titer of the recombinant adenovirus was 2 x 10(9) pfu/mL. The mouse caveolin-1 recombinant adenovirus was constructed successfully by using AdEasy adenovirus system. Cell transfection and expression of exogenous gene can be detected directly by observing the expression of GFP. These results provide the basis for the further study on the role of caveolin-1 gene in other scopes.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 03/2008; 39(2):294-7.
  • Xin Nie · Yan Jin · Jie Long · Ling Wu · Wei Jing · Yun-Feng Lin · Wei-Dong Tian ·
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    ABSTRACT: To compare the growth and development of tissue engineered tooth germ implanted into different tissues, and explore a suitable growing environment for the tissue engineered teeth in vivo. SD rat/porcine tooth germ cells from postnatal 4 days were used as seeding cells, which combined various scaffolding biomaterials to construct the compound with tissue engineered teeth. The allografts were implanted into renal subcapsule, the mesenteries and subcutaneous tissues. Then, the implants were retrieved at special time points for histological analysis. Further developments were not observed in the graft implanted into mesenteries and subcutaneous tissues. Partial grafts were fallen off and lost from the subcutaneous tissues after implanted, and there were obvious lymphocyte infiltrations in the mesenteries. Moreover, the enamel and pulp-dentin complex were observed within the graft implanted in the subrenal capsule, which indicated there to be good condition. The subrenal capsule can provide a promising implantation environment for the further growth of allogeneic tissue engineered tooth germ, and the subrenal capsule implantation can be used as a new alternative method for tissue-engineering tooth in vivo.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 03/2008; 39(2):279-82.
  • Hong-Bing Jiang · Wei-Dong Tian · Lei Liu · Wei Tang · Xiao-Hui Zheng · Xi-Zhe Chen ·
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    ABSTRACT: To investigate the feasibility of tooth regeneration by seeding cranial neural crest stem cell (CNCSC) in vivo. Cranial neural tubes, dissected from mouse E9 d, were explanted onto fibronectin-coated dishes. CNCSC emigrated from the explanted neural tubes, and were cultured in a free-serum medium containing modified DMEM/F12. CNCSC, induced by FGF8, BMP2, TGFbeta1 and dentin matrix non-collagen protein (DMNCP), were cultured with collagen/chitosan, and implanted into the subcutaneous part of immunodeficiency mouse. The expression of collagen I/dentin sialophosphoprotein (DSPP) was analyzed by immunocytochemistry. With the scaffolds destroying, columnar cells possessing polarized nuclei and matrix produced by cells were showed in some regions. Immunohistochemical staining demonstrated that collagen type I and DSPP were expressed throughout the cytoplasm and matrix produced by cells. By tissue engineering approach, our experiments further verify the odontoblast-like cell phenotype differentiation of CNCSC in vivo.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 03/2008; 39(2):276-8, 282.
  • Jian Zhang · Wei-dong Tian · Xin Nie · Lei Liu · Wei Tang · Yun-feng Lin ·
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    ABSTRACT: The purpose of this study was to investigate the distribution and relationship of fibronectin (FN), bone morphogenetic protein (BMP) 2, 4 during development of mouse tooth germ. Rat embryonic first molars were collected from E14 (bud stage) and E18 (bell stage). The expressions of FN and BMP-2, 4 were analyzed with immunohistochemistry. RESLUTS: FN was located in the epithelium and dental mesenchyme on bud stage, but on bell stage, the FN was found at the region of differentiating odontoblasts and in the inner enamel epithelium, and also BMP-2, 4 were abundant mainly at the brisk region of differentiating odontoblasts. The results demonstrate that BMP-2, 4 and FN play the important roles during bud stage and bell stage, and there may be synergy between BMP-2, 4 and FN in regulating differentiation and maturity of odontoblasts.
    Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition 10/2007; 38(5):826-8.
  • Hang Wang · Meng-Shi Chen · Yu-Bo Fan · Wei Tang · Wei-Dong Tian ·
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    ABSTRACT: This study used a biomechanical model to examine fundamental questions about rigid plate fixation treatment for maxillary Le Fort I fractures. Specifically, we sought to elucidate the principal strain patterns generated in miniplates and bite force transducers secondary to all masticatory forces, as well as the amount of permanent deformations incurred due to these loading forces. Forty polyurethane synthetic maxillary and mandibular replicas were used to simulate the mandible and maxilla. Ten replicas were controls (group A). The other 30 were divided into 3 groups (10 each), according to the fixation techniques of 3, 2, and 1 miniplates each side (groups B-D), that were osteotomized in the Le Fort I fracture line on the maxilla. Different forces of masseter medial pterygoid, temporalis, and lateral pterygoid muscles were loaded onto the replicas to simulate different functional conditions (anterior incisor, premolar, and molar clenching). Rosette strain gauges were attached at predefined points on the plates and the bite force transducer to compare the stability and bite force of the different fixation methods for maxillary Le Fort I fractures. Statistically significant differences were found for the deformation of the plates among fixation techniques. The order of stability for each technique was: group B greater than group C greater than group D. In regard to bite force, no difference was found between those found with group A and group B (P > .05), whereas the bite forces of groups C and D were less than those of group A (P < .05). The fixation of 3 miniplates on each side provides sufficient stability and restores the bite force to the level of the intact maxilla. "The ideal fixation" with 2 miniplates on each side restores 90% of the bite force, and there were more deformations of the miniplates with the "ideal fixation" compared to those found with group B. Group D fixation produced the worst effects for the treatment of maxillary Le Fort I fractures with a weak bite force and insufficient stability.
    Journal of Oral and Maxillofacial Surgery 07/2007; 65(6):1109-16. DOI:10.1016/j.joms.2006.10.020 · 1.43 Impact Factor
  • Yong-Dai Shen · Wei-Dong Tian · Lei Liu · Yong-Houg He · Wei Tang · Xiaohui Zheng ·
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    ABSTRACT: The Sonic hedgehog signalling peptide has been demonstrated to play important roles in the growth and patterning of the tooth development. This study aims on whether the antagonist beta-transduction repeat containing protein of Sonic hedgehog signal transduction expressed in tooth germs ameloblast and odontoblast or not. The mouse embryo heads of different developmental stages of E10.5, E13.5, E14.5, E16.5, E18.5 and P0, P3, P6 after birth were acquired fixed with 4% paraformaldehyde for 48 hours, embeded with Paraffin and examined using LsAB (labelled streptavidin-biotin) method to observe the beta-TrCP expression pattern in tooth germs, ameloblast and odontoblast. It was demonstrated that beta-TrCP expressed in oral epithelium, tooth bud, mesenchymal cell cytoplasm of ameloblast and odontoblast of different stage of tooth development. beta-TrCP expressed from early stage to later stage of murine tooth development. And these findings provide the evidence of antagonist regulatory pathways for shh in teeth development.
    Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology 05/2007; 25(2):195-7.
  • Zhi-Yong Li · Ling Chen · Lei Liu · Yun-Feng Lin · Sheng-Wei Li · Wei-Dong Tian ·
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    ABSTRACT: This study aimed to investigate the odontogenic potential of bone marrow mesenchymal stem cells (BM-MSCs) for seeding in tooth regeneration. In this study, BM-MSCs were co-cultured with oral epithelial cells derived from rat embryos. Expression of the odontogenic genes Pax9, DMP1, and DSPP was detected by the reverse-transcription polymerase chain reaction (RT-PCR) technique. To further characterize the odontogenic potential of BM-MSCs, the gold standard in vivo transplantation system was used. The results revealed that Pax9, DMP1, and DSPP expression was detected by RT-PCR only after co-culture of BM-MSCs and oral epithelial cells derived from embryos age E11.5. Histological analyses of the BM-MSCs/epithelial cell mass demonstrated the presence of tooth-like structures. The series of experiments both in vitro and in vivo demonstrated that BM-MSCs can differentiate into functional odontoblast-like cells. This implies that BM-MSCs may become a novel source of cells for seeding in tooth regeneration research.
    Journal of Oral and Maxillofacial Surgery 04/2007; 65(3):494-500. DOI:10.1016/j.joms.2006.09.018 · 1.43 Impact Factor
  • Jin-gang Xiao · Lei Liu · Hai Dong · Wei-dong Tian · Xiao-yu Li · Wei Tang · Xiao-hui Zheng ·
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    ABSTRACT: To study the characters of the diagnosis and treatment for midfacial fractures with orbital floor fractures. 136 cases of midfacial fractures with orbital floor fractures were diagnosed and treated. All patients underwent CT scans and accepted surgical intervention. Orbital floor fracture was restituted in 49 cases. Orbital floor defects were reconstructed with autogenous bone, titanium mesh or porous polyethylene implant (Medpor) in 21 cases. 136 cases recovered well, their facial appearance and function were improved significantly. There were no severe complications happened postoperatively in all cases. 2 cases had postoperative wounds infection and 1 case had temporary ablepsia, but healed completely. CT is the best method for diagnosing orbital floor fractures. The objective of treatment is restoration of normal orbital floor and orbital capacity, the reduction of orbital contents prolapsed and reconstruction of orbital floor fractures with repair materials.
    Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology 03/2007; 25(1):67-9.

Publication Stats

236 Citations
18.10 Total Impact Points


  • 2006-2012
    • Sichuan University
      • • Department of Oral and Maxillofacial Surgery
      • • State Key Laboratory of Oral Diseases
      • • Key Laboratory of Oral Biomedical Engineering
      Hua-yang, Sichuan, China
    • West China Hospital of Stomatology
      Hua-yang, Sichuan, China
  • 2005
    • Kunming Medical College
      Yün-nan, Yunnan, China