Objective To measure the mandibular thickness relative to the osteotomy line of mandibular angle plasty so that to provide the anatomical basis for operation.Methods 37 youth women patients mandible were scanned by spiral CT,then the three-dimensional reconstruction was done,the thickness of the mandible around osteotomy line were measured on the planes corresponding to the posterior margin of mandibukar ramus,the middle part of the mandibular ramus,the posterior line of the third molar,the line between the second and third molar,the line between the second and first molar and the line between the first molar and the second premolar.The data were analyzed by Spss 11.5.Results The thichest bone around the osteotomy line was under the second and third molar,then the bone thickness became thinner forward and backward.The thinnest bony was on the middle part of the mandibular ramus.Conclusion The result of this study is of significant for guiding operation and reducing the complications.

Objective To investigate the expression of syntaxin 8(STX8)in glioma and its clinical signif-icance. Methods Specimens of glioma were collected from 57 patients at Beijing Renhe Hospital from May 2013 to December 2015. 57 pieces of glioma tissue were used as a study group ,12 of which were Ⅰ+ Ⅱ(low grade) and the rest 45 were Ⅲ+Ⅳ;normal brain tissues from 15 individuals were used as a control group. Real-time PCR,immunohistochemistry,and Western blot were used to detect expression of STX8. Results As compared with the normal brain tissue ,the mRNA expression of STX8 was significantly increased in glioma tissue ,with a relative expression volume of 1.6855 ± 0.07124 in low grade and 2.8207 ± 0.0692 in high grade tissues,there was significant differences between the two groups;and the difference was also significant as compared with the control group(P < 0.05). The results of immunohistochemistry showed that the expression of STX8 was higher in glioma tissue than in normal tissue. Western Blot showed that the expression of STX8 protein was significantly higher in glioma than in normal tissue(P<0.05);the relative expression volume of STX8 was 2.271 ± 0.1621 in low grade tissue and 4.937 ± 0.1851 in high grade tissue,with a significant difference between the two groups;the difference was also significant as compared with the control group(P<0.05). The correlation analysis showed that higher STX8 expression in glioma was not significantly related to gender,age and pathological types,but there was a significant difference between pathological stages. Conclusion STX8 has abnormal high expression in glioma,which may be closely related with the occurrence and development of glioma.

Objective: To compare the methods of metabolic balance (MB) and fecal monitoring (FM) for evaluating the dietary zinc (Zn) absorption in Tibetan men. Methods: In 14 d field trial on 16 adult Tibetan men, capsules of carmine were given to mark the feces from D4 to D12, and samples of diet, water, feces and urine were collected during the period. In addition, 4.0 mg zinc tracer (enriched with 67Zn) and 1.0 mg recovery indicator ytterbium (Yb) were orally administrated to the subjects in the evening meal of the D5. The ratio of 67Zn/68Zn in fecal samples was determined by inductively coupled plasma mass spectrometry, and then the zinc absorption was calculated based on the principle of isotope dilution. Results: The dietary zinc absorption in Tibetan men was (23.8?3.9) % evaluated by MB and (21.4?4.3) % by FM with significant difference (by paired-samples t test) and linear correlation (Pearson). The unabsorbed zinc tracer and Yb had the similar behavior through the digestive tract, mostly excreted within5 d following the intake. Conclusion: In the 14d metabolic period, the dietary zinc absorption from MB was a little higher than that from FM. Using FM, the metabolic period can be shortened to 4-5 days according to excretion of Yb. Both methods suggested that the dietary zinc absorption in the adult Tibetan men was good.

Objective To evaluate inhibitory effect of Chlamydia trachomatis plasmid-encoded protein pORF5 on HeLa cell apoptosis induced by tumor necrosis factor-alpha(TNF-α). Methods The recombinant lentiviral expression vector containing pORF5 gene and helper plasmids were co-transfected into 293T cells to prepare the recombinant lentivirus. Then, the lentivirus particles were collected and concentrated, and used to infect HeLa cells. Flow cytometric screening identified stable pORF5-expressing HeLa (pORF5-HeLa) cells. Meanwhile, the empty plasmid was transfected into HeLa cells to prepare control HeLa cells. The two cell lines were both divided into two subgroups to be treated with 20μg/L TNF-αand fresh culture medium respectively for 6 hours. Then, Hoechst 33258 staining was performed to observe morphological changes of apoptotic cells, flow cytometry to detect cell apoptosis, real-time PCR to measure the mRNA expression of Caspase3, Bax and Bcl-2, and Western blot analysis to determine the protein expression of Bax and Bcl-2. Results After 6-hour treatment with TNF-α, Hoechst 33258 staining showed variable degrees of karyopyknosis and karyorrhexis, and highly-refractive blue apoptotic bodies in the pORF5-HeLa cells and control HeLa cells. The pORF5-HeLa cells and control HeLa cells both showed significantly higher apoptosis rate in the treated subgroup than in the untreated subgroup (pORF5-HeLa cells:35.5%± 4.5%vs. 9.5%± 1.5%, t=13.53, P<0.01;control HeLa cells:63.6%± 5.8%vs. 7.9%± 0.9%, t=32.36, P<0.01). Compared with treated control HeLa cells, treated pORF5-HeLa cells showed significant decreases in mRNA expression of Bax(72.8%)and Caspase 3(84.5%)(t = 35.29, 42.25, respectively, both P < 0.01), as well as in Bax protein expression(t = 17.58,P < 0.01), but significant increases in Bcl-2 mRNA and protein(6.8 times)expression(t = 87.12, 18.93, respectively, both P <0.01). Conclusion pORF5 plasmid protein can inhibit TNF-α-induced HeLa cell apoptosis likely by increasing the expression of anti-apoptotic protein bcl-2 and decreasing the expression of pro-apoptotic proteins Caspase-3 and Bax.

Objective To explore the diagnostic significance of CT and MRI in dermatofibrosarcoma protuberans.Methods Analyze the CT and MRI images of 16 cases which were confirmed as dermatofibrosarcoma protuberans by pathology.The medical imaging features of dermatofibrosarcoma protuberans were summarized.In the total 16 cases(including 6 male cases,10 female cases),15 cases had suffered from dermatofibrosarcoma protuberans for more than 1 year, 11 cases for more than 5 years, and 9 cases had history of recurrence.Results On MRI, the mass was slightly hypointense on T 1 WI, inhomogeneously hyperintense on T 2 WI with inhomogenous enhancement.The diameters of mass were less than 5 cm in 3 cases,and were more than 5cm in 13 cases.Fifteen cases had clear demarcation between the masses and their adjacent muscles , 7 cases had “suspension sign” in shapes, 10 cases had “sub-nodules outward” features at the edge of the tumors , 12 cases had “multinodular” features inside the tumor , and 8 tumors grew into the surrounding fat layer like roots.Conclusion Dermatofibrosarcoma protuberans can be diagnosed accurately based on the features displayed on CT and MRI.

Objective To study the correlations among lumbosacral anatomical structure variations and herniation of intervertebral disc.Methods Through analyzing lumbar CT images of 684 patients with lumbocrural pain between 15 to 24 years old, the anatomical variations of spondylolysis, scoliosis deformity, lumbosacral transitional vertebra, subfissure, lumbosacral angle and others (including vertebral muscles beside, spines, transverse process on both sides) were observed, and the correlations among these anatomical variations and herniation of intervertebral disc were analyzed.Results The correlations among these above mentioned anatomical variations and herniation of intervertebral disc were 93.6%,92.3%,87.5%,81.3%,72.1%,53.3% respectively.In 91.4% of patients, the lumbosacral anatomical structure variations suffered herniation of intervertebral disc at the same time.But only 36.2% of patients suffered herniation of intervertebral disc without lumbosacral anatomical structure variations.Conclusion Lumbosacral anatomical structure variation is the main reason of herniation of intervertebral disc on teenagers.CT examination,which can reflect the correlation between them.

BACKGROUND:It has been proved that miR-34a plays an inhibitory role in the growth of lung cancer stem cels, but the underlying mechanism remains unclear.
OBJECTIVE:To explore the inhibitory effect of miR-34a on lung cancer stem celsand the underlying mechanism.
METHODS:The CD133+lung cancer stem cels were separated from lung cancer A549 cel lines using magnetic activated cel sorting method. And miR-34a-overexpressing CD133+lung cancer stem cels were established by liposome transfection technology. Besides,the targeted relationship between miR-34a and Notch1 was analyzed by the dual-luciferase reporter. Afterwards, Notch1 silencing was performed by gene knockout, and its effect on lung cancer stem cels was determined.
RESULTS AND CONCLUSION:After sorted and detected by immunomagetic selection and flow cytometry assay respectively, a high rate of CD133+lung cancer stem cel was obtained. And qRT-PCR detected that the expression level of miR-34a in CD133+lung cancer stem cels was significantly lower than that in CD133-lung cancer stem cels. Moreover, miR-34a-overexpressing CD133+lung cancer stem cels were successfuly constructedandmiR-34a significantly inhibited proliferation and induced apoptosis of lung cancer stemcels. Dual-luciferase reporter assay indicated that Notch1 mRNA was a target of miR-34a. In addition, Notch1 silencing obviously inhibited proliferation and induced apoptosis of lung cancer stem cels. These findings suggest that miR-34a can inhibite lungcancer stem celsviathe Notch1 signaling pathway.

OBJECTIVETo apply the classic leakage integrate-and-fire models, based on the mechanism of the generation of physiological auditory stimulation, in the information processing coding of cochlear implants to improve the auditory result.

METHODSThe results of algorithm simulation in digital signal processor (DSP) were imported into Matlab for a comparative analysis.

RESULTSCompared with CIS coding, the algorithm of membrane potential integrate-and-fire (MPIF) allowed more natural pulse discharge in a pseudo-random manner to better fit the physiological structures.

CONCLUSIONThe MPIF algorithm can effectively solve the problem of the dynamic structure of the delivered auditory information sequence issued in the auditory center and allowed integration of the stimulating pulses and time coding to ensure the coherence and relevance of the stimulating pulse time.

Acoustic Stimulation ; Algorithms ; Cochlear Implantation ; Cochlear Implants ; Humans ; Membrane Potentials ; Models, Theoretical ; Signal Processing, Computer-Assisted ; Speech Discrimination Tests

OBJECTIVETo study the effect of silicon dioxide nanoparticles on the expression and promoter region CpG islands methylation of (Poly [ADP-ribose] polymerase 1, PARP-1) gene in human HaCaT Cell.

METHODSHaCaT Cells were treated with nm-SiO₂at 0, 2.5, 5 and 10 µg/mL and micro-SiO₂at 10 µg/ml for 24 h and DAC treatment was given at 10 µg/ml group for 48 h. Real-time PCR and western blot assay was used to detect the expression of PARP-1 mRNA and protein. BSP (Bisulfite Pyrosequence, BSP) assay was used to detect the promoter region CpG islands methylation status of PARP-1 gene.

RESULTSAfter exposure to nano-SiO₂particles, compared to CTRL group, the mRNA and protein expression of PARP-1 in micro-SiO₂and 2.5 µg/ml group unchanged, but he mRNA and protein expression of PARP-1 in 5, 10 µg/ml as well as DAC group was down-regulated and there are statistical significance between CTRL group and 5, 10 µg/ml as well as DAC group and the PARP-1 promoter region CpG islands showed methylation.

CONCLUSIONnano-SiO₂can down-regulate PARP-1 expression in HaCaT Cell and this is associated with the change in the methylation of PARP-1 gene promoter region CpG islands induced by nano-SiO₂particles.

Cell Line, Tumor ; CpG Islands ; DNA Methylation ; Humans ; Nanoparticles ; adverse effects ; Poly (ADP-Ribose) Polymerase-1 ; Poly(ADP-ribose) Polymerases ; metabolism ; Promoter Regions, Genetic ; RNA, Messenger ; metabolism ; Silicon Dioxide ; adverse effects