Cheek ; pathology ; Choristoma ; Humans ; Salivary Ducts

BACKGROUND: Sampling the autogenous bone always needs to develop the second operational area or harvest surrounding the implant, which will increase the risk of trauma and infection. Therefore autogenous bone powder may be taken into consideration to reclaim and use for the treatment of local bone defect.OBJECTIVE: To construct experimental models of repairing bone defect by autogenous bone powder and implant material, and observe the biocompatibility between materials and host.DESIGN: Single sample observation.SETTING: College of Stomatology, Dalian Medical University.MATERIALS: The experiment was performed at the Animal Experimental Center of Dalian Medical University from August 2005 to April 2006. Five healthy hybrid dogs were used in this study. Titanium nail and Bio-Oss bone implant materials were designed and produced by Xi'an Zhonghang Titanium Biological Materials Co., Ltd.METHODS: The first, second and third premolars of dogs were uprooted and received implantation 3 months later. Four implant sockets were prepared at left and right sides respectively of each dog, totally 40 sockets. One titanium nail was implanted into each socket, totally 40 nails. Autogenous bone powder collected when drilling hole, Bio-Oss implant materials and their mixture at 1:1 were implanted in artificial bone defect at bucca side, respectively, while non-implanted bone was served as blank control.MAIN OUTCOME MEASURES: ①At week 9, recovery of bone mass was recorded. Height of alveolar bone, density of bone trabecula and osseointegration were observed by X-ray film.②Histological change was determined by methylene blue-basic fuchsin method.RESULTS: No titanium nail fell off, so five dogs were all involved in the result analysis.①General condition and bone defect: At week 9 of implantation, wound was well healed, and the titanium nail was stable with total reserved rate of 100%. Compared with blank control, the bone defect mass was less in bones implanted with autogenous bone powder (P＜0.01), and the least in bones implanted with mixed powder, which had optimal recovery.②Recovery of bone mass: X-ray film demonstrated that, 40 titanium nails were closely connected with bone, and the healing was well.③Biocompatibility between materials and host: All titanium nails were closely surrounded by erythroic compact bone, no blue soft tissues were seen between implant materials and bone, and direct bone interface appeared under low power lens.CONCLUSION: It is effective to repair bone defect by autogenous bone powder and implant material in dog models,good hiocompatibility is observed between materials and host.

The strategy of silico cloning based on the express sequence tags sequence (ESTs)and genome database is a new technique developed in recent years,and the core of the technique is to use bioinformatics technique to assemble and extend ESTs to get part of cDNA and even all sequence.It has the virtue of low investment,high speed,low and well-targeted technical requirements,etc.The relationship between human disease and genes has been widely confirmed,therefore,silico cloning technology will become the important means of disease research.This paper aims at elaborating the progress of silico cloning in medicine.

This study is to investigate the effect of (2-methyl-n-butyl) shikonin (MBS) on inducing apoptosis of human gastric cancer cell line SGC-7901 and the role of ERK1/2 signal pathway in the apoptosis. MTT assay was used to detect SGC-7901 cell proliferation. DNA condensation was measured by DAPI stain. Cell apoptosis was analyzed by flow cytometry. Mitochondrial membrane potential (MMP) was analyzed by JC-1 staining. The protein expressions of Bcl-2, Bax, Survivin, cleaved caspase-9, cleaved caspase-3, cleaved PARP, p-ERK1/2, ERK1/2, p-JNK, JNK, p-p38 and p38 were detected by Western blotting. The results showed that MBS reduced the cell viability of SGC-7901 cells in a dose- and time-dependent manner. The IC50 at 24 h and 48 h for SGC-7901 cells was 10.113 and 4.196 micromolL(-1), respectively. After being treated with MBS, the typical nuclear condensation was observed in SGC-7901 cells by DAPI stain. Apoptosis in SGC-7901 cells was induced by MBS in a dose dependent manner. The protein expression of Bcl-2 was down-regulated, while the protein expressions of cleaved caspase-9, cleaved caspase-3, cleaved PARP, p-ERK1/2 and p-JNK were up-regulated after MBS treatment. U0126, a specific MAP kinase (MEK1/2) inhibitor, blocked the ERK1/2 activation by MBS. MMP was decreased by MBS treatment. It can be concluded that MBS could inhibit SGC-7901 cell proliferation and induce apoptosis. Mitochondrial apoptosis pathway, ERK1/2 signal pathway and JNK signal pathway might be involved in this process.

Objective:To investigate the effects of oxaliplatin (OXA) and teniposide (VM-26) on proliferation and apoptosis of gastric cancer cell line BGC-823.Methods:MTT assay was used to examine the inhibition rate of cell growth when cells were treated at various concentrations of OXA and VM-26 alone or in combination. The apoptosis was examined by flow cytometry (FCM). The protein expression of cell apoptosis associated proteins caspase-9 and livin were examined by immunocytochemistry. Results:OXA or VM-26 effectively inhibited the growth of BGC-823 gastric cancer cells in a concentration-dependent manner at certain range of concentrations. The inhibitory rate of combined treatment with OXA and VM-26 was significantly higher than that of OXA or VM-26 alone (P<0.05). The value of combination index (CI) was 0.46. The rate of apoptosis cells induced by 1.25 μg/mL OXA was 6.13%, 13.86% and 21.48% at 12, 24 and 48 h. The apoptosis rate induced by 0.625 μg/mL VM-26 was 4.60%, 10.72% and 17.07% for 12, 24 and 48 h. In combined treatment group the apoptosis rate was 11.73%, 24.14% and 44.75% at 12, 24 and 48 h, respectively. The difference was significant between combined treatment group and single drug treatment group (P<0.05). Immunnocytochemical analysis showed that the expression of caspase-9 protein was up-regulated after being exposed to OXA (1.250 μg/mL) or OXA plus VM-26 (0.750 μg/mL), while the expression rate of livin protein was down-regulated. There were significant differences among different treatment groups as well as between treatment groups and control group (P<0.05).Conclusion:OXA combined with VM-26 has synergistic effects in inhibiting the growth and inducing apoptosis of gastric cancer BGC-823 cells.

BACKGROUND: It has been shown that patients managed with hemodialysis experience decrease of quality of life. But there are a few reports about the relationship between the self-management behavior such as dietary behavior, taking medicine, management behavior of physical sign etc and health-related quality of life (HRQOL) in hemodialysis patients.OBJECTIVE: To study the relationship between self-management behavior and HRQOL in Chinese hemodialysis patients,especially potential association of self-management behavior variables with indicators of HRQOL in order to improve their quality of life (QOL).DESIGN: Sampling investigation based on hemodialysis patients.SETTING: Nursing department and dialysis center in a university hospital. PARTICIPANTS: This research was completed in the Nursing Department of First Hospital Affiliated to China Medical University. Totally 120hemodialysis patients,63 males and 57 females,aged 19 -79 years old with the mean age of(52 ± 12),were selected from the First and Second Hospital Affiliated to China Medical University,the First Affiliated Hospital of Dalian Medical University,the Central and the Second Hospital of Shenyang Medical College,from July to September 2003. Inclusion criteria: Patients above 18years old,dialysis history more than 3 months with twice or three times every week,understanding the questionnaires and being volunteers. Exclusion criteria: Patients with acute disease and mental disorder.METHODS: Self-administered questionnaire was used to measure self-management behavior and short-form 36 health survey(SF-36) was used to measure HRQOL of patients with hemodialysis. Correlation and multivariate regression analysis were used to test the relationship between self-management behavior and HRQOL.MAIN OUTCOME MEASURES: Self-management behavior and HRQOL.RESULTS: Totally 107 questionnaires were available. Multivariate regression analysis indicated that management of physical,psychosocial activity was the significant factor of.physical component summary(regression coefficient = 2.709,R2 =0. 150,P<0.01),and management of physical sign,psychosocial behavior was the significant factor of mental component summary(regressioncoefficient=1.126,R2=0.041,P<0.05).CONCLUSION: Improving hemodialysis patients' management of physical,psychosocial activity and management of physical sign could help hemodialysis patients to raise their HRQOL.

Silk fiber,as a kind of natural polymer,has been used as surgical sutures in clinic for years.Silk fiber is composed of a filament core protein,termed fibroin and a glue-like coating called sericin proteins.Due to its unique mechanical properties,good biocompatibility and slow degradability,silk fiber has been put in variety of applications as a new kind of biomedical scaffolds in recent years.With the development of the processing technique,silk fiber can be processed through the new versatile processing method to form various forms of scaffolds and its surface could be modified for different purposes.Further more,it could be tailored through genetic recombination to form the silk fibroin-like polymers which has a promising potential in medical applications.

BACKGROUND:Femoral head necrosis induced by glucocorticoid is typical under mechanics load.OBJECTIVE:To create the rat models of the femoral head necrosis by long-term glucocorticoid treatment,and to Observe the changes of femoral head necrosis induced by glucocorticoid under mechanics load.METHODS:Wistar rats with 4-month old were randomly divided into the experimental and control groups.After the buttocks injection of dexamethasone 20mg/kg weakly for 8 weeks,rats in the experimental group were made to run on the running machine at a speed of 1 km/h to forme the hyper-weight model;at the same time those in the control group were with the normal physiological weight.Rats in both groups were sacrificed at weeks 2,4,6 and 8.The left legs were taken for the biomechanics test on the EnduraTEC ELF3200,the biggest vertical deformation and stiftness were calculated,the number of empty osteocyte lacunas was calculated,and the cumulative absorbance value was compared between two groups.RESULTS AND CONCLUSION:The femoral head presented with necrosis at 8 weeks in the experimental group.and the width of bone trabecula,and the stiffness of which were smaller than that of the control group.but the biggest vertical deformation was greater the concurrent control group(P＜0.05).The Bcl-2 cumulative absorbance value of 2 groups had significant differences at 4 weeks(P＜0.05),which was increased with time prolonged in the experimental group(P＜0.05).The results demonstrated that:in glucocorticoid-induced osteonecrosis of the femoral head,mechanics Ioad induces the obviously osteocyte necrosis.more cartilage repair,and trabeculae rupture,which is considered as the direct reason of the necrosis of the femoral head The typical femoral head necrosis is presented.

Objective To investigate the effects about Tetramethyl -pyrazine (TMP)to Bad, Caspases-1 protein relating with JNK signal transduction pathways on cultured rat hippocampal neurons after anoxia-reoxygenation. Methods Rat hippocampal neurons were cultured in vitro and observed respectively on 7 ~ 9 days. Neurons were exposed to TMP in three different concentration (60,200,800 μg/mL) and JNK inhibitors (10 μmol/L). Control/normal groups were set in each experiment, except for the normal group. After 1 hour of treatment, the rat hippocampal neurons were placed in an incubator with 90%N2 + 10% CO2 for 2 hours to induce anoxia. Then, the rat hippocampal neurons were placed in an incubator with 5% CO2+95%air to establish reoxygenation. Bad, Caspases-1 protein were examined by Western Blot. Results After neurons with 60,200, 800 μg/mL TMP and 10 μmol/L JNK inhibitors on damage induced by anoxia-reoxygenation , the Bad , Caspases-1 protein are lower than the control group. But the 200 μg/mL group is better than 60 800 μg/mL groups. Conclusions Through the JNK signal transduction pathways, the Caspases-1, Bad protein expressions are lower than the control group. So TMP has obvious inhibitory action to rat hippocampal neuronal damage induced by anoxia-reoxygenation.

BACKGROUND:In recent years, interventional therapy because of its high success rate, good curative effect, little trauma has been widely recognized, but vascular intimal injury due to interventional therapy stil has no effective treatment, resulting in long-term postoperative severe restenosis. Stem cel transplantation has brought a new drawn for the repair of impaired endothelial function, reendothelialization and aided restoration of the blood supply to ischemic tissues. OBJECTIVE: To summarize the recent progress in umbilical cord blood stem cels transplantation and endovascular treatment for treatment of diabetic lower limb ischemic disease. METHODS: A computer-based search of PubMed and CNKI was performed for relevant articles published from January 2000 to March 2015 using the keywords of “umbilical cord blood stem cel transplantation, percutaneous transluminal angioplasty, diabetic lower limb ischemia, restenosis” in English and Chinese. Totaly 216 relevant literatures were initialy obtained, and 44 articles were ultimately included. RESULTS AND CONCLUSION:By comparing the therapeutic efficacy and long-term prognosis of umbilical cord blood stem cel transplantation and endovascular treatment, it is concluded that umbilical cord blood stem cel transplantation combined with endovascular treatment is better than either of them alone, which can promote the establishment of colateral circulation, improve the impaired endothelial function and reduce the occurrence of restenosis after interventional therapy.