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Feng X.,Peking University | Zhu L.,ChangSha Stomatological Hospital | Xu L.,Peking University | Meng H.,Peking University | And 6 more authors.
Archives of Oral Biology | Year: 2015

Objective: To date, no information on the distribution of periodontal microorganisms among family members of Chinese patients with aggressive peridontitis (AgP) is available. The aim of the present study was to investigate the probability of transmission of eight periodontal microorganisms between patients with aggressive periodontitis and their family members. Design: Saliva and pooled subgingival plaque samples were collected from 103 participants from 41 nuclear families (including 41 AgP probands, 19 mothers, 22 fathers, 21 siblings). Eight periodontal microorganisms, including Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola, Campylobacter rectus, Prevotella intermedia, Prevotella nigrescens and Fusobacterium nucleatum were detected in these samples by the polymerase chain reaction (PCR). In addition, the distribution of fimA genotypes was assessed in P. gingivalis-positive individuals by PCR. Results: P. gingivalis, T. forsythia, T. denticola, C. rectus and F. nucleatum were the most frequently detected species both in AgP probands and in their relatives. Kappa statistical analysis revealed that the detection of A. actinomycetemcomitans (Kappa = 0.503) and F. nucleatum (Kappa = 0.565) in probands was highly consistent with that in their relatives. Most probands shared the identical fimA genotype of P. gingivalis with their relatives. Conclusions: Our results suggested that the intrafamilial transmission of periodontal microorganisms may occur between Chinese patients with aggressive periodontitis and their relatives. © 2014 Elsevier Ltd. All rights reserved.

Zhou Z.-S.,Changsha Stomatological Hospital | Li M.,Changsha Stomatological Hospital | Li M.,Central South University | Gao F.,Central South University | And 6 more authors.
Oncology Reports | Year: 2013

Betel nut chewing is the most common cause of oral submucous fibrosis (OSF). Arecoline is the main component of the betel nut, and is associated with the occurrence and development of OSF through cytotoxicity, genotoxicity and DNA damage. Similar types of stimuli elicit differential responses in different cells. In the present study, we investigated the effects of arecoline on the HaCaT epithelial and Hel fibroblast cell lines. The data showed that arecoline affected HaCaT cell morphology. MTT assay revealed that arecoline suppressed HaCaT cell proliferation. Furthermore, we found that arecoline induced the cell cycle arrest of HaCaT cells. In comparison with the untreated control cells, following treatment with ≥75 μg/ml arecoline an increased percentage of HaCaT cells remained at the G0/G1 phase of the cell cycle, accompanied by a reduced percentage of cells in the S phase. However, arecoline treatment did not significantly alter Hel cell cycle distribution. In the HaCaT epithelial cells, arecoline downregulated expression of the G1/S phase regulatory proteins cyclin D1, CDK4, CDK2, E2F1 as determined by reverse transcription-PCR analysis and western blotting. In summary, arecoline inhibits HaCaT epithelial cell proliferation and survival, in a dose-dependent manner, and cell cycle arrest in the G1/S phase, while this is not obvious in the Hel fibroblast cells. Potentially, our findings may aid in the prevention of arecoline-associated human OSF.

PubMed | Changsha Stomatological Hospital, Central South University and Yiyang Central Hospital
Type: Journal Article | Journal: Molecular medicine reports | Year: 2016

Abnormal expression of microRNAs (miRNAs) is involved in the development of and antiapoptotic effects in various types of human cancer. However, miRNAmediated regulation of oral verrucous carcinoma (OVC) remains to be elucidated. The present study aimed to investigate the expression of miR181b in OVC and oral squamous cell carcinoma (OSCC). The expression levels of miR181b were determined using reverse transcriptionquantitative polymerase chain reaction. The expression levels of Bcell lymphoma 2 (Bcl2) and leucine rich repeats and immunoglobulin like domains1 (LRIG1), were evaluated using immunohistochemical staining. The correlation between Bcl2 and LRIG1 expression was determined using a Pearson correlation analysis. The expression levels of miR181b and Bcl2 in OVC were significantly higher compared with normal mucosal tissue (NM); however, lower compared with the OSCC. The key target of miR181b was LRIG1 and it was significantly lower in OVC tissues compared with NM tissue; however this was higher when compared with OSCC tissue. The expression levels of Bcl2 were correlated with expression levels of LRIG1 in OVC tissues. Therefore, LRIG1 may be associated with antiapoptotic function in OVC tissues.

Xie H.,Changsha Stomatological Hospital
Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology | Year: 2012

To examine the expression of cytochrome P450 related genes in oral submucous fibrosis tissue and to investigate the possible role of the genes in pathogenesis of oral submucous fibrosis (OSF). Buccul mucosa tissues were obtained from OSF patients in early, medium and advanced stages, with each stage including 10 patients. Normal buccul mucosa tissues were collected from 10 patients undergoing oral and maxillofacial surgery as control. Oral submucous fibrosis-related genes were analysed by cDNA chips, and the results were submitted to the gene network database. Differentially expressed genes related to the pathway of CYP metabolism were indentifyed by the database analysis. Reverse transcription-polymerase chain reaction (RT-PCR) was used to verify the results from cDNA chips by increasing sample volume. There were eight genes [CYP2B6, CYP2C18, CYP2F1, CYP3A5, microsomal glutathione S-transferase 2 (MGST2), alcohol dehydrogenase (ADH), UDP glucuronosyl transferase 2B15 (UGT2B15), ADH1C] which were related to the pathway of CYP metabolism. These genes were low expressed in all stages of OSF (P < 0.001).There were no differences in genes expression among the three stages of OSF (P > 0.05). There were down-regulated genes related to the pathway of CYP metabolism in oral submucous fibrosis tissue. The ability of the pathway of CYP to metabolize and clear betel nut ingredients was reduced in OSF patients, which may play a role in the pathogenesis of OSF.

Qu B.,Central South University | Qu B.,Changsha Stomatological Hospital | Liu O.,Central South University | Fang X.,Central South University | And 10 more authors.
Cell and Tissue Research | Year: 2014

Dental tissue-derived mesenchymal stem cells (MSCs) are a reliable cell source for dental tissue regeneration. However, the molecular mechanisms underlying the directed differentiation of MSCs remain unclear; thus, their use is limited. The histone demethylase, lysine (K)-specific demethylase 4B (KDM4B), plays critical roles in the osteogenic commitment of MSCs by up-regulating distal-less homeobox 2 (DLX2) expression. The DLX2 gene is highly expressed in dental tissue-derived MSCs but the roles of DLX2 in osteogenesis are unclear. Here, we investigate DLX2 function in stem cells from apical papilla (SCAPs). We found that, in vitro, DLX2 expression was up-regulated in SCAPs by adding BMP4 and by inducing osteogenesis. The knock-down of DLX2 in SCAPs decreased alkaline phosphatase (ALP) activity and mineralization. DLX2 depletion affected the mRNA expression of ALP, bone sialoprotein (BSP) and osteocalcin (OCN) and inhibited SCAP osteogenic differentiation in vitro. Over-expression of DLX2 enhanced ALP activity, mineralization and the expression of ALP, BSP and OCN in vitro. In addition, transplant experiments in nude mice confirmed that SCAP osteogenesis was triggered when DLX2 was activated. Furthermore, DLX2 expression led to the expression of the key transcription factor, osterix (OSX) but not to the expression of runt-related transcription factor 2 (RUNX2). Taken together, these results indicate that DLX2 is stimulated by BMP signaling and enhances SCAP osteogenic differentiation by up-regulating OSX. Thus, the activation of DLX2 signaling might improve tissue regeneration mediated by MSCs of dental origin. These results provide insight into the mechanism underlying the directed differentiation of MSCs of dental origin. © 2014 Springer-Verlag.

Xie Y.,Central South University | Zhou J.,Changsha Stomatological Hospital | Wei Q.,Central South University | Yu Z.M.,Central South University | And 3 more authors.
Journal of the Mechanical Behavior of Biomedical Materials | Year: 2016

Abutment screw loosening is the most common complication of implanting teeth. Aimed at improving the long-term stability of them, well-adherent and homogeneous micro-crystalline diamond (MCD) and nano-crystalline diamond (NCD) were deposited on DIO® (Dong Seo, Korea) abutment screws using a hot filament chemical vapor deposition (HFCVD) system. Compared with bare DIO® screws, diamond coated ones showed higher post reverse toque values than the bare ones (p<0.05) after cyclic loading one million times under 100 N, and no obvious flaking happened after loading test. Diamond coated disks showed lower friction coefficients of 0.15 and 0.18 in artificial saliva when countered with ZrO2 than that of bare Ti6Al4V disks of 0.40. Though higher cell apoptosis rate was observed on film coated disks, but no significant difference between MCD group and NCD group. And the cytotoxicity of diamond films was acceptable for the fact that the cell viability of them was still higher than 70% after cultured for 72 h. It can be inferred that coating diamond films might be a promising modification method for Ti6Al4 V abutment screws. © 2016 Elsevier Ltd.

Sun W.,Changsha Stomatological Hospital | Hou B.,Changsha Stomatological Hospital
Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology | Year: 2010

OBJECTIVE: To compare torsional fracture of three different types of nickel-titanium rotary instruments ProTaper, Hero642 and Mtwo by making a stimulate models in vitro.METHODS: Through the establishment of model in vitro, compared the different time with 3 kinds of nickel titanium file in cutting-edge bound occurs, and to observe the section of fractured instruments by scanning electron microscope.RESULTS: The resistence to torque was different from three types of nickel titanium instruments. The time to fracture of Mtwo was significantly longer than ProTaper's and Hero642's, but ProTaper's and Hero642's had no significant difference. Three kinds cross-sectional design were different, a lot of toughness nests were seen in broken surface. Most of them were ductile fracture. Time to fracture was influenced by the quality disfigurement.CONCLUSION: The resistance to torque of Mtwo was better than ProTaper and Hero642. The lifespan was influenced by the design of cross-section. The quality disfigurement of the files reduced the resistance to flexual fatigue.

PubMed | Changsha Stomatological Hospital and Central South University
Type: Journal Article | Journal: Oncology reports | Year: 2017

Resveratrol, one of the major polyphenols found in red wine, is suggested to have a role as a chemo-prevention or chemotherapy agent in various human cancer models. Herein, we report that resveratrol has a profound antitumor effect on human hepatocellular carcinoma (HCC) cells by down-regulation of the HGF-c-Met signaling pathway. Resveratrol inhibited anchorage-dependent and -independent growth of HCC cells in a dose-dependent manner. Short-term resveratrol exposure substantially decreased HGF-induced c-Met signaling pathway activation, and long-term exposure to resveratrol markedly inhibited c-Met expression on the cell membrane. Additionally, resveratrol suppressed HGF-induced cell invasion, and knockdown of c-Met decreased the sensitivity of HCC cells to resveratrol treatment. Finally, the antitumor activity of resveratrol was validated in xenograft model and resveratrol prominently restrained tumor growth invivo. In summary, our results suggested that c-Met offers a candidate molecular target for hepatocellular carcinoma management.

PubMed | Changsha Stomatological Hospital
Type: Journal Article | Journal: Journal of endodontics | Year: 2012

Enterococcus faecalis is frequently recovered from root-filled teeth with refractory apical periodontitis. The ability of E. faecalis to form a matrix-encased biofilm contributes to its pathogenicity; however, the role of extracellular dextran and DNA in biofilm formation and its effect on the susceptibility of the biofilm to chlorhexidine remains poorly understood.E. faecalis biofilms were incubated on dentin blocks. The effect of a dextran-degrading enzyme (dextranase) and DNase I on the adhesion of E. faecalis to dentin was measured using the colony-forming unit (CFU) counting method. CFU assays and confocal laser scanning microscopy were used to investigate the influence of dextranase and DNase I on the antimicrobial activity of 2% chlorhexidine.The CFU count assays indicated that the formation of biofilms by E. faecalis was reduced in cells treated with dextranase or DNase I compared with that in untreated cells (P < .05). In addition, we found that treating E. faecalis biofilms with dextranase or DNase I effectively sensitized the biofilms to 2% chlorhexidine (P < .05).Both dextranase and DNase I decrease the adhesion of E. faecalis to dentin and sensitized E. faecalis biofilms to 2% chlorhexidine.

PubMed | Changsha Stomatological Hospital
Type: Journal Article | Journal: Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology | Year: 2012

To evaluate the effects of different surface treatment on the fracture resistance of teeth restored with fiber posts and core system.24 fiber posts were divided into three groups according to different surface treatment techniques, including sandblasting, etching with hydrogen peroxide, and no treatment performed (the control group). All fiber posts were luted with a composite resin luting agent in the canal roots. The teeth were restored with composite resin cores and metal crowns. After cementation, the teeth were subjected to simulated aging conditions consisting of mechanical loading cycles and thermal cycles. All teeth were loaded in a mechanical testing machine, and the fracture load and fracture mode of each teeth were recorded.The fracture resistances of sandblasting and hydrogen peroxide groups were higher than the control group (P<0.05), while the fracture resistances of two test groups had no significant differences (P>0.05). Fracture modes of all fiber post groups were nearer to the coronal third of the root.Sandblasting and etching with hydrogen peroxide can improve the fracture resistance of teeth.

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