Effect of long chain non-coding RNA H19 on the migration and invasion of oral cancer cells and its molecular mechanism / 华西口腔医学杂志

OBJECTIVE@#To investigate the effect of the long chain non-coding RNA H19 (lncRNA H19) on the invasion and migration of oral cancer cells and its related molecular mechanism.@*METHODS@#The expression levels of lncRNA H19, miR-107, and cyclin-dependent kinase 6 (CDK6) in the immortalized oral epithelial cell line HIOEC and the oral cancer cell line CAL27 were detected by real-time quantitative polymerase chain reaction. CAL27 cells were transfected with siRNA H19, miR-107 mimics, pcDNA H19, or anti-miR-107, and the effects of H19 and miR-107 on the invasion and migration of cells were examined via Transwell assay. The TargetScan database predicted the targeting of H19, miR-107, and CDK6. Double luciferase reporter gene assay was performed to detect interactions among H19, miR-107, and CDK6. Western blot analysis was conducted to examine the effects of H19 and miR-107 on the protein level of the target gene CDK6.@*RESULTS@#Compared with that in HIOEC cells, the expression of H19 was significantly increased in CAL27 cells (P<0.05). After transfection with siRNA H19, the expression of H19 decreased, and the invasion and migration ability of CAL27 cells were inhibited (P<0.05). H19 could bind specifically to the 3'-UTR of miR-107 to modulate the expression of miR-107. Compared with that in HIOEC cells, the expression of miR-107 significantly decreased in CAL27 cells (P<0.05). The expression of miR-107 increased after transfection with siRNA H19, and anti-mir-107 co-transfection could promote the invasion and migration ability of siRNA H19 in CAL27 cells (P<0.05). Compared with that in HIOEC cells, CDK6 expression significantly increased in CAL27 cells (P<0.05), and the expression level of the gene was coregulated by H19 and miR-107 (P<0.05).@*CONCLUSIONS@#lncRNA H19 plays an important role in the development of oral cancer. It can regulate the invasion and migration of oral cancer cells by targeting the miR-107/CDK6 signaling axis.

Lymphatic targeting study of pingyangmycin-activated carbon nanoparticles treating oral cancer lymph node metastasis / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the drug distribution in tissues of cervical lymph node metastasis mice model after submucosa adjacent cancer injection of pingyangmycin-activated carbon nanoparticles (PYM-CH-NP) and evaluate the lymph targeting effect of PYM-CH-NP.</p><p><b>METHODS</b>Pingyangmycin (PYM) was radiolabeled with 125I by modified the chloramine T method. Cervical lymph node metastasis mice model was established by buccal submucosa inoculation of a high lymph metastasis cell line U14 cancer cell. 360 mice models burdened with cervical lymph metastasis were randomly divided into 3 groups. PYM group was treated with PYM water solution, PYM-CH-NP group was treated with PYM-CH-NP. Negative control group was injected with activated carbon nanoparticles. PYM-CH-NP and pingyangmycin water solution were injected in pericancer submucosa of the mice respectively. The radioactivity of drug in blood, heart, liver, spleen, lung, kidney and cervical lymph node were measured after 0.5, 1, 4, 8, 12, 24, 48, 72, 96, 120, 144, 168 h administration. The radioactivity of each samples per unit weight were calculated. The selectivity index (SI) and targeting index (TI) of drug were calculated.</p><p><b>RESULTS</b>The radioactivity of drug in cervical lymph node of PYM-CH-NP group was much higher than PYM group in each time point (P < 0.001), whereas the blood, heart, liver, spleen, lung and kidney uptake of pingyangmycin was greatly decreased in PYM-CH-NP group after 4 h administration (P < 0.001). The SI value of PYM group at each time point was less than 1. While the minimum SI and TI value of PYM-CH-NP was 1.793 and 1.562, the maximum value reached to 68.126 and 14.623 after 72 h administration.</p><p><b>CONCLUSION</b>PYM-CH-NP can increase drug dosage in metastasized cervical lymph nodes, and decrease drug dosage of other organs. So better therapeutic outcome and little adverse reaction may be achieved for lymph node metastasis.</p>

Effect of Matrine on cell cycle and human telomerase reverse transcriptase of human salivary adenoid cystic carcinoma / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the effect of the traditional Chinese medicine Matrine on cell cycle and human telomerase reverse transcriptase (hTERT) of human ACC-M cell lines.</p><p><b>METHODS</b>Different concentrations of Matrine were used in the medium of ACC-M cells. Change of cell cycle were detected by flow cytometry after ACC-M cell were cultivated with different concentrations Matrine (0.25, 0.50, 0.75, 1.00 mg x mL(-1)). Expression of hTERT was investigated by reverse transcription-polymerase chain reaction (RT-PCR) and indirect immunofluorescene and flow cytometry quantitative analysis.</p><p><b>RESULTS</b>Matrine caused obviously the GdG1 phase block and inhibited proliferation of ACC-M cells. At same time, this effect was positive correlation to Matrine concentration and treat time. Matrine can inhibit the expression of hTERT mRNA and protein.</p><p><b>CONCLUSION</b>Matrine can obviously inhibit cell cycle and down-regulate expression of hTERT. Inhibition of cell cycle is possible correlation with down-regulation expression of hTERT.</p>

The application of three-dimensional reconstruction technique of 64-slices spiral CT in locating of embedded teeth in jaws / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the allocation of embedded teeth in jaws using the three-dimensional reconstruction technique of 64-slices spiral CT.</p><p><b>METHODS</b>27 cases were examined by helical scanning of axial view volume scan CT. The exact localization of the embedded teeth in jaws was acquired by using volume rendering (VR), maximum intensity projection (MIP), multiplanar reformation (MPR) and curve plane reconstruction (CPR).</p><p><b>RESULTS</b>The localization, morphous, size, erupted orientation and relationship between surrounding tissues of the 41 embedded teeth in 27 patients were displayed by effectually using the images of VR, MIP, MPR and CPR. The election of orthodontic treatment or surgical intervention was decided by using 64-slices spiral CT.</p><p><b>CONCLUSION</b>The exact data and objective evidence of the treatment plan could be provided by 64-slices spiral CT which will have important clinical application.</p>

Genetic linkage analysis and mutation detection in Chinese families with basal cell nevus syndrome / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study the molecular genetic etiology of a Chinese pedigree with basal cell nevus syndrome.</p><p><b>METHODS</b>The proband and his affected mother and a unaffected individual in the pedigree were chosen and peripheral blood was collected from them for DNA. Direct sequencing was performed to detect the mutations of PTCH gene. In order to further confirm the results of sequence analysis, all available family members were analyzed with genetic linkage analysis using 3 highly polymorphic microsatellite DNA markers in the region of 9q22.3-q31.</p><p><b>RESULTS</b>No mutations of PTCH gene was detected in the proband's mother, one synonymous mutation was detected in the proband. Linkage analysis showed that the Lod scores of the 3 markers were: D9S283, Z = -2.11 (theta = 0.00); D9S1690, Z = -2.95 (theta = 0.00); D9S1677, Z = -5.94 (theta = 0.00).</p><p><b>CONCLUSIONS</b>In this pedigree, mutation of PTCH gene is not related to the underlying pathogenesis of the syndrome.</p>