[Relationship between crown form of upper central incisors and papilla filling in Chinese Han-nationality youth].

OBJECTIVE: To explore a crown form classification method for upper central incisor which is more objective and scientific than traditional classification method based on the standardized photography technique. To analyze the relationship between crown form of upper central incisors and papilla filling in periodontally healthy Chinese Han-nationality youth. METHODS: In the study, 180 periodontally healthy Chinese youth ( 75 males, and 105 females ) aged 20-30 (24.3±4.5) years were included. With the standardized upper central incisor photography technique, pictures of 360 upper central incisors were obtained. Each tooth was classified as triangular, ovoid or square by 13 experienced specialist majors in prothodontics independently and the final classification result was decided by most evaluators in order to ensure objectivity. The standardized digital photo was also used to evaluate the gingival papilla filling situation. The papilla filling result was recorded as present or absent according to naked eye observation. The papilla filling rates of different crown forms were analyzed. Statistical analyses were performed with SPSS 19.0. RESULTS: The proportions of triangle, ovoid and square forms of upper central incisor in Chinese Han-nationality youth were 31.4% (113/360), 37.2% (134/360) and 31.4% (113/360 ), respectively, and no statistical difference was found between the males and females. Average κ value between each two evaluators was 0.381. Average κ value was raised up to 0.563 when compared with the final classification result. In the study, 24 upper central incisors without contact were excluded, and the papilla filling rates of triangle, ovoid and square crown were 56.4% (62/110), 69.6% (87/125), 76.2% (77/101) separately. The papilla filling rate of square form was higher (P=0.007). CONCLUSION: The proportion of clinical crown form of upper central incisor in Chinese Han-nationality youth is obtained. Compared with triangle form, square form is found to favor a gingival papilla that fills the interproximal embrasure space. The consistency of the present classification method for upper central incisor is not satisfying, which indicates that a new classification method, more scientific and objective than the present one, is to be found.

Obatoclax induces Beclin 1- and ATG5-dependent apoptosis and autophagy in adenoid cystic carcinoma cells.

OBJECTIVES: Adenoid cystic carcinoma (ACC) is one of the most common salivary gland cancers. The prognosis of adenoid cystic carcinoma is poor for its high frequency of distant metastases and insensitivity to chemotherapy or molecular therapies. This study investigated the effect of Obatoclax on adenoid cystic carcinoma cells and its cytotoxic mechanism. METHODS: Western blot, transmission electron microscopy, and pEGFP-LC3 plasmids transfection were carried out to detect autophagy in ACC cells treated with Obatoclax. 3-MA and RNA interference against Beclin 1 and ATG5 were used to inhibit autophagy. Then we used Western blot and Hochest 33342 staining for apoptosis assessment. Finally, cell viability was assessed by MTT assay. RESULTS: We found that Obatoclax induced cytoprotective autophagy which depended on ATG5 and partly on Beclin 1 in adenoid cystic carcinoma cells. Furthermore, pharmacologically inhibiting Obatoclax-induced autophagy promoted apoptosis. Downregulation of Beclin 1 or ATG5 attenuated the cytotoxicity of Obatoclax by suppressing both autophagy and apoptosis. Finally, when apoptosis was pharmacologically inhibited, autophagic cell death was initiated in adenoid cystic carcinoma cells treated with Obatoclax. CONCLUSION: In summary, Beclin 1 and ATG5 play important roles in regulating both Obatoclax-induced autophagy and apoptosis in adenoid cystic carcinoma.

Myeloid-derived suppressor cells contribute to oral cancer progression in 4NQO-treated mice.

OBJECTIVE: Abnormal myelopoiesis especially the expansion of myeloid-derived suppressor cells (MDSCs) is increasingly recognized as an important reason for the escape of tumor from immune surveillance. This study aims to investigate the role of this specific population of cells in oral cancer progression. MATERIALS AND METHODS: 4-Nitroquinoline 1-oxide (4NQO) was used to induce oral cancer in C57BL/6 mice. The tongue mucosa was examined by hematoxylin and eosin staining. The distribution of MDSCs in the spleen and peripheral blood and T cell subsets in the spleen was analyzed by flow cytometry. The expression of MDSCs in the tongue tissues was investigated by immunohistochemical staining, and the expression of arginase-1 (ARG-1) and NOS-2 in the tongue tissues was detected by real-time PCR. RESULTS: We found that during tumor progression, significantly increased frequency of MDSCs was observed in the spleens and peripheral blood of 4NQO-treated mice, and the frequency of MDSCs in the spleens was positively correlated with systemic CD3(+) CD8(+) T cells. Moreover, 4NQO-treated mice showed significantly higher MDSCs infiltration and ARG-1 mRNA level in the tumor site. CONCLUSIONS: Myeloid-derived suppressor cells contribute to oral tumor progression and represent a potential target for immunotherapy of oral cancer.

Inhibition of microRNA-218 promotes oral squamous cell carcinoma growth by targeting GLUT1 to affect glucose metabolism.

OBJECTIVE: Glucose transporter 1 (GLUT1) is a key player in glucose metabolism that has important roles in oral squamous cell carcinoma (OSCC), while microRNA-218 can target GLUT1 to achieve its biological roles. Therefore, we hypothesize that microRNA-218 may target GLUT1 to participate in OSCC. PATIENTS AND METHODS: Tumor tissues and adjacent healthy tissues were collected from OSCC patients, and blood samples were collected from both OSCC patients and healthy controls. Expression of microRNA-218 and GLUT1 in those tissues was detected by qRT-PCR. All patients were followed up for 5 years. Diagnostic and prognostic values of serum microRNA-218 for OSCC were investigated by ROC curve analysis and survival curve analysis, respectively. MicroRNA-218 knockdown OSCC cell lines were established. The effects on cell proliferation, glucose uptake as well as GLUT1 expression were detected by CCK-8 assay, glucose uptake assay and Western blot. RESULTS: MicroRNA-218 expression level was decreased while GLUT1 expression level was increased in tumor tissues compared with adjacent healthy tissues. Serum level of microRNA-218 was lower, while serum level of GLUT1 was higher in cancer patients than that in healthy control. Serum microRNA-218 and GLUT1 can be used to accurately predict OSCC and its prognosis. MicroRNA-218 knockdown promoted tumor cell proliferation, increased glucose uptake and promoted GLUT1 expression. CONCLUSIONS: Inhibition of microRNA-218 can promote oral cancer cell growth by targeting GLUT1 to affect glucose metabolism.

Progress of beam diagnosis system for EAST neutral beam injector.

Neutral beam injection has been recognized as one of the most effective means for plasma heating. According to the research plan of the EAST physics experiment, two sets of neutral beam injector (NBI) were built and operational in 2014. The paper presents the development of beam diagnosis system for EAST NBI and the latest experiment results obtained on the test-stand and EAST-NBI-1 and 2. The results show that the optimal divergence angle is (0.62°, 1.57°) and the full energy particle is up to 77%. They indicate that EAST NBI work properly and all targets reach or almost reach the design targets. All these lay a solid foundation for the achievement of high quality plasma heating for EAST.

Note: A new regulation method of stable operation of high power cathode ion source.

The hot cathode ion source will tend to be unstable when operated with high power and long pulse. In order to achieve stable operation, a new regulation method based on the arc power (discharge power) feedback control was designed and tested on the hot cathode ion source test bed with arc discharge and beam extraction. The results show that the new regulation method can achieve stable arc discharge and beam extraction. It verifies the success of feedback control of arc source with arc power.

Recent Outbreak of Fusarium Wilt of Basil in Florida.

Symptoms of wilt, leaf chlorosis, leaf drop, and shoot and plant death were observed in commercial fields of basil (Ocimmum basilicum L.). Disease incidence ranged from 10 to 80% among individual fields. Initial isolations from infected stem tissue were made on water agar amended with streptomycin sulfate. Single-spore isolates transferred onto corn leaf agar were identified as Fusarium oxysporum Schlechtend.:Fr. f. sp. basilicum Dzidzariya. Pathogenicity tests were performed on 10-cm-tall basil plants, cv. Siam Queen, for three Florida isolates and one Massachusetts isolate. An inoculum concentration of 1 × 106 conidia per ml was applied to soil around the roots. Symptoms of wilt, external stem discoloration, and death of basil occurred after 14 days, and F. oxysporum f. sp. basilicum was reisolated from plants inoculated with all four isolates. Controls were disease-free. Identification of the isolates as F. oxysporum f. sp. basilicum was done with a set of DNA primers developed by Pan and Wick (2) for a 0.7-kb DNA fragment unique to this pathogen. This report confirms the existence of F. oxysporum f. sp. basilicum in Florida (1), and identifies this disease as a potential threat to commercial basil production. References: (1) S. A. Alfieri et al. Diseases and Disorders of Plants in Florida. Bull. No. 14. Fla. Dept. Agric. Consumer Serv., 1993. (2) Z. Pan and R. L. Wick. Phytopathology 85:1559, 1995.

[Peripheral blood T-cell subsets in patients with ovarian malignancies].

Blood samples from 79 subjects (27 cases of ovarian malignancy, 2 ovarian borderline epithelial tumor, 38 benign gynecologic disease and 12 healthy women) were measured for peripheral blood T-cell subsets using monoclonal antibodies and SPA-Ig rosette technique. It was found that in patients with ovarian malignancy, the percentage of OKT4+ cells was significantly reduced whereas the percentage of OKT8+ cells was markedly increased as compared with those in the healthy women and patients with benign gynecologic disease; OKT4/OKT8 ratio declined obviously; which were more pronounced in patients with advanced or recurrent tumor.

Path integral approach to the pricing of timer options with the Duru-Kleinert time transformation.

In this paper, a time substitution as used by Duru and Kleinert in their treatment of the hydrogen atom with path integrals is performed to price timer options under stochastic volatility models. We present general pricing formulas for both the perpetual timer call options and the finite time-horizon timer call options. These general results allow us to find closed-form pricing formulas for both the perpetual and the finite time-horizon timer options under the 3/2 stochastic volatility model as well as under the Heston stochastic volatility model. For the treatment of timer options under the 3/2 model we will rely on the path integral for the Morse potential, with the Heston model we will rely on the Kratzer potential.