砄bjective: To study the rule of the degradation of HA artificial bone(HAB). Methods: The samples of HAB were immersed in PBS or distilled water (DW),the changes of the shape, weight, compressive strength of the samples and pH value of the immersion solutions were measred at the intervals of 2 or 4 weeks until 28 weeks. Results: At 4 weeks, HAB began to be degraded, 8 weeks later, the speed of the degradation slowed down. From 4 to 12 weeks, the compressive strength decreased rapidly. The pH value of the immersion solutions decreased from 2 to 12 weeks,but increased from 12 to 28 weeks when it was close to the neutral value. Conclusion: HA artificial bone can be degraded in PBS solution, and the degradation can cause noticeable changes of the compressive strength of the material and pH value of the immersion solution.

Objective: The purpose of this study is to investigatc the effects of the HAB/DBP composite in the restoration of restoring bone defects. Methods: The HAB/DBP composiite, HAB or DMB samples were grafted into the defects of rabbit's radii respectively and the samples were examined 2 weeks, 4 weeks, 8 weeks and 12 weeks after operation with general, radiological and histological observations respectively.Results: In the group of HAB/DBP composssite implanted area , mesenchymal cells and new bone stromas were observed assembling 2 weeks after the operation. New bone formation and bone trabeculation were found 4 weeks after transplantation. A lot of bone trabeculation and composite degrad ation were observed 8 weeks after operation. The defects were completely restored 12 weeks after the surgery.Conclusion: The HAB/DBP composite has the properties of osteoconduction and osteoinduction, and its osteogenic ability is similar to that of DMB.

0.05),respectively. Conclusion: The results indicate that the multidrug resistance of MEC-1/5Fu may be related to the higher expression of P-gp170 protein.

Objective:To study the effects of 17 beta-estradiol (E2) on the proliferation and metastasis potential of salivary gland mucoepidermoid carcinoma M_3SP_4 cells. Methods:The effects of E2 on the potential of proliferation and metastasis of M_3SP_4 cells were investigated by cell counting, MTT assay, clonegenetic assay, in vivo tumour growth and metastasis assay in nude mice.The expression of VEGF,c-erbB-2,Ki-67 and P16 in M_3SP_4 cells was examined by immunohistochemistry assay. Results:E2 increased the proliferation of M_3SP_4 cells at 10~-10-10~-5 mol/L. E2 at 10~-7 mol/L showed the strongest effects.After treatment with E2 at 10~-7 mol/L,the population doubling time of M_3SP_4 cells decreased by 10.8%,clonegenecity increased by 225%, VEGF,c-erbB-2 and Ki-67 expression increased,P16 decreased.In the in vivo assay,the tumour growth increased by 65% and metastasis increased by 609% in nude mice treated with E2 at 0.005 2 mg/d. Conclusion:E2 may stimulate the proliferation and metastasis potential of M_3SP_4 cells.

0.05), on the 4th day 7.56?6.87 and 10.00?7.07 (P0.05). After therapy all the data of electrocardiogram, blood routine examination and blood biochemical test of the cases were without clinical significance. Conclusion:50 g/L amlexanox is effective and safe in the treatment of RAU.

Objective:To investigate the effects of 17-? estradiol (E2) on the proliferation and metastasis of adenoid cystic carcinoma SAcc83 cells.Methods:The effects of E2 on the proliferation of SAcc83 cells were studied by MTT assay and flow cytometry.The invasion potential of the cells was investigated with chicken embryo heart invasion assay.The in vivo growth and metastasis of SAcc83 cell induced tumor were studied in ovary-resected female nude mice. Results:E2 at 10 -7 ,10 -8 and 10 -9 mol/L promoted the proliferation of SAcc83 cells. E2 at 10 -7 mol/L showed the strongest growth stimulation effects and increased the cell proliferation by 34.4%.With exposure time of 1,2 and 3 d it increased the proliferation index by 33.3%,40.9% and 17.8% respectively;with the exposure time of 12,18 and 24 h,it increased S phase cells in cell cycle by 12.3%,3.3% and 9.7% respectively. Neoplasm developed in all nude mice after subcutaneous transplantation of 106 cells.In the mice treated with 0.2 ml of E2 at 9.55 ?10 -5 mol/L every day for 15 days neoplasm volume doubling time was 61.5 h,that in control mice 76.5 h.In lung metastasis trial, 42 days after tail injection of the cells the metastasis foci in E2 treated mice inreased by 41.2%.Conclusion:E2 may increase the proliferation and metastasis of adenoid cystic carcinoma cells.

Objective:To establish a culture method of human salivary gland epithelial cells and to study their growth characteristics in vitro.Methods:Tissue explant technic was employed to culture human salivary gland epithelial cells in serum free medium (SFM),1∶1 DMEM/F12 and 1∶1 DMEM/F12 containing 25 ml/L fetal boven serum (FBS) respectively.The morphology of the cultured cells was observed by phase contract microscope.The cell growth was studied by cell counting.The cells were identified by HE staining,PAS staining and SP staining.Results:Growth of human salivary gland epithelial cells was observed in primary culture in the three kinds of medium in all 10 cases. The cultured cells were epidermoid, positive for cytokeratin, negative for Vimentin and positive for PAS staining. The cells in SFM could be subcultured for five passages,while only for one passage in the other two kinds of medium.Conclusion:SFM is superior to serum free 1∶1 DMEM/F12 or 1∶1 DMEM/F12 containing 25 ml/L FBS for the culture of human salivary gland epithelial cells.

砄bjective: To establish PTEN gene transfected mucoepidermoid carcinoma cell line. Methods: Wild type PTEN gene was transducted into a highly metastatic mucoepidermoid carcinoma cell line by using lipofectamine. The positively transfected cell clones were selected with puromycin. The expression of PTEN protein in the cells was determined by western blot and immunohistochemical methods. Results: An anti puromycin cell clone was obtained and expanded in culture. Western blot and immunohistochemical staining revealed that the PTEN protien was expressed in the transfected cells. The cells were named M 3SP 2 PTEN. Conclusion: M 3SP 2 PTEN is a cell line expressing exogenous PTEN protein.

砄bjective: To establish an immortalized chondrocyte cell line derived from rabbit mandibular condyle without loss of chondrocyte phenotype. Methods: SV 40 large T antigen gene was conducted into primarily cultured mandibualr condylar chondrocytes (MCCs) of 1-2 week old New Zealand rabbits using an recombinant retroviral vector's transfecting method. After cultured in selective medium containing 400 ?g/ml G418 for 3 weeks, colonies were isolated and expanded for further study. Slot blot analysis was used to detect the transcript of type I and type II collagen of the transgenic cells. Results: One of the positive clones had been maintained for 100 passages for nearly one and half year, without any sign of senescence, and termed immortalized mandibular condylar chondrocyte (IMCC). Transcripts of pro ?1 ( I ) and ?1 ( II ) collagen was observed in IMCCs and MCCs by RNA blot. Conclusion: IMCC is an immortalized chondrocyte cell line derived from rabbit mandibular condyle and might be a good model for studying the biological character of MCC.

?Objective:To study the effects of Docetaxel on the proliferation and metastatic potential of mucoepidermoid carcinoma M 3SP 4 cells in vitro and in vivo . Methods:Inhibitory effects of Docetaxel on the proliferation and metastatic potential of mucoepidermoid carcinoma M 3SP 4 cells were investigated with cell counting,cloning assay flow cytometry, tail vein injection and submandibular gland injection of the cells into nude mice. Results:Docetaxel inhibited M 3SP 4 cells growth in a dose and time dependent way. The IC 30 and IC 50 (with 72 h exposure) of Docetaxel were 0.34 nmol/L and 0.63 nmol/L, respectively; the doubling time(h) of the cells treated with the drug at IC 30 for 7 days and of the control were 32.7 h, 43 h, respectively; the clonogenesity(%) of the control and of the cells treated with Docetaxel ( 0.05 nmol/Lor 0.1 nmol/L)were (29.2?1.4)% and (20.2?0.8)% and (2.8?0.4)%, respectively; the number of metastatic foci on lung surface in the nude mice treated with the drug at 30 mg/kg?week and in the controls were 0 and 11?3.4; the weight(g) of submandibular gland in the two groups were 0.31?0.05 and 1.20?0.23 respectively. Conclusion:Docetaxel may inhibit the proliferation and metastatic potential of mucoepidermoid carcinoma M 3SP 4 cells.