Effects of Genistein on the proliferation and expression of survivin in salivary adenoid cystic carcinoma cell line SACC-83 / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the anti-proliferation effect of tyrosine protein kinase inhibitor, Genistein, on human salivary adenoid cystic carcinoma cell line SACC-83, and its effect on Survivin expression.</p><p><b>METHODS</b>SACC-83 cells were treated with different concentration Genistein for different time, cell survival rate was calculated with MTT assay, apoptosis was detected with flow cytometry, the expression of Survivin was quantitatively analyzed by Western blotting and FluorChem V2.0 software.</p><p><b>RESULTS</b>When treated with Genistein of certain concentration for certain time, SACC-83 cell growth was significantly inhibited. With the increase of concentration and elongation of acting time, the inhibitory effects increase. Treated with 220 micromol/L Genistein for 72 hours, SACC-83 cell growth was significantly inhibited, cell apoptosis was induced (P < 0.01), and the expression of Survivin decreased.</p><p><b>CONCLUSION</b>Genistein inhibits the growth of human salivary adenoid cystic carcinoma cell line SACC-83, and induces cell apoptosis; the decrease of Survivin expression may be one of the mechanisms of Genistein inducing apoptosis.</p>

Effect of static magnetic field on bone morphogenetic protein-2 in periodontal membrane of experimental periodontitis rat / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the effect of static magnetic field on expression of bone morphogenetic protein-2(BMP-2) in the periodontal membrane of experimental periodontitis rat.</p><p><b>METHODS</b>Experimental periodontitis of rat was formed by ligaturing the neck of rat teeth and feeding sugar of high concentration. The magnet which the intensity of magnetic field was 0.12 tesla was put into their cheeks. The rats were sacrificed at 2nd day, 4th day and 7th day, respectively. Immuno-histochemical techniques were used to evaluate the change of BMP-2 expression.</p><p><b>RESULTS</b>BMP-2 was mainly found in the plasma of fibroblast, osteoblast, cementocyte and odontoblast separately. There was not clearly difference between the periodontitis group and the normal group, but BMP-2 in the experimental group treated with static magnetic field was higher than the two groups.</p><p><b>CONCLUSION</b>Static magnetic field plays an important role in repairing and remodeling of periodontitis.</p>

Expression of basic fibroblast growth factor in dental pulp during root development of permanent teeth / 华西口腔医学杂志

<p><b>OBJECTIVE</b>The purpose of this study was to investigate the changes of basic fibroblast growth factor (bFGF) expressed in normal human dental pulp at different root development stages of permanent teeth.</p><p><b>METHODS</b>Based on the teeth root development status, the pulp tissues were classified into three groups: root just starting development, being in development and apical closed. The pulps were immunohistochemically examined by use of bFGF antibody.</p><p><b>RESULTS</b>Staining was strongly positive in immature permanent teeth, especially at the stage of root just starting development. Image analysis indicated that the gray values of positive reaction in three groups were statistically different (P < 0.001). For the first group, the gray value of the outer pulp was higher than that of the pulp core. For the second group, the pulp core has a higher gray value in the coronal pulp, while a lower value in root pulp compared to the outer pulp.</p><p><b>CONCLUSION</b>With the development of root formation, the expression of bFGF in dental pulp shows different characteristics. bFGF may play a role in dental pulp development and maturation.</p>

Expression of telomerase activity and cyclin A in ameloblastoma / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study relation of the expression of hTERT mRNA and cyclin A, p53 protein, proliferation cell nuclear antigen (PCNA) in ameloblastoma (AB) and to investigate clinical biological characteristics of AB.</p><p><b>METHODS</b>The hTERT mRNA was detected by in situ hybridization, cyclin A, p53 protein and PCNA by SP method. Normal oral mucosa and odontogenic keratocyst (OKC) are comparition.</p><p><b>RESULTS</b>The positive ratio of hTERT mRNA was 1/7 cases in normal oral mucosa. The expression of cyclin A, p53 and PCNA in normal oral mucosa were similar, and the positive cells distributed in stratum basale. In OKC, the positive cells distributed in stratum basale and super-strrtum basale. And the positive ratio of hTERT, cyclin A, p53, PCNA in OKC was 14/16 cases, 4/32 cases, 11/25 cases, 5/9 cases, respectively. In AB, the positive ratio of hTERT mRNA, cyclin A, p53 protein and PCNA was 94.4% (51/54), 66.7% (40/60), 85.7% (42/49) and 78.1% (25/32), respectively. A strong correlation was found between hTERT mRNA with cyclin A, p53 protein and PCNA (r(s) = 0.914, 0.848, 0.804, P < 0.05).</p><p><b>CONCLUSIONS</b>The expression of hTETR mRNA, cyclin A, p53 and PCNA is different in different tissues and lesions, and correlates with cell differentiation and clinical biology behaviour. Telomerase activity is related to cumulation of p53 protein, related to cell proliferation and differentiation, regulated by cyclin A, and higher in S phase.</p>