BACKGROUND:The tumor tissue engineering can build an integrated culture model to ful y simulate the in vivo microenvironment of tumor growth, which can be used to study tumor developmental dynamics and related treatment strategies.
OBJECTIVE:To review the three-dimensional culture of tumor cells using tumor engineering technology.
METHODS:PubMed database was retrieved for articles related to tumor engineering, three-dimensional culture of tumor cells, biological scaffold materials and tumor microenvironment published from January 1992 to March 2013.
RESULTS AND CONCLUSION:Three-dimensional culture, because of its reproducible tissue and cellgrowth in vivo, has become an important platform for study of tumor resistance, invasiveness and tumor microenvironment. The three-dimensional culture has showed a trend to gradual y replace the flat culture technique in many fields, and provides a research platform which is very close to in vivo environment. In recent years, with the development of tumor engineering, a variety of new polymer materials have been used in the three-dimensional culture of tumor cells. Three-dimensional culture technology is becoming a hotspot in the field of tumor biology, in which, using a variety of methods and materials, the cells show a growth in the spatial manner to form a biological support or matrix similar to in vivo growth environment. Biomaterials have become the soil on which seed cells can grow wel , and plays an alternative to the extracellular matrix or the matrix of tissues and organs in the tumor engineering. Therefore, the three-dimensional cellculture has been widely used in cancer research, which has become a powerful tool to tumor drug resistance, angiogenesis, cel-cellinteraction, signal transduction, stem cells and other research.

Objective To investigate the retinal toxicity and verify the safe dose of intravitreal injection of nonsteroid anti inflamatory drug, diclofenac sodium. Methods Twenty eight healthy adult white rabbits were divided at random into 7 groups and received in every right eye the intravitreal injection of a single dose of diclofenac sodium solution ranging from 0.4～1.0 mg/0.1ml respectively,the left eyes were regarded as control ones. Before injection and on the 1st, 3rd, 7th, 14th, 21st, and 28th day after injection the electroretinography on both eyes was examined. On the 28th day after injection the retinas of two rabbits of every group were examined by using light microscopy. On the 10th and 30th day after injection the retinal tissues around the optic nerve disk of two eyes from every group at random were tested by using transmission electron microscopy. Results The ratio of amplitude of b wave of electroretinography in 0.4 mg and 0 5 mg groups had no significant difference from groups before injection,the retinal tissues showed no structural changes in light and electron microscopy examination. The ratio of amplitude of b wave of photoptic electroretinography in 0.6 mg groups in the early stage after injection was markedly reduced ( P

Ocular albinism type 1 (OA1),the most form of the ocular albinism,is an X-linked disorder mainly characterized by a severe reduction of visual acuity,hypopigmentation of the retina,photophobia,strabismus and nystagmus. The OA1 gene is located on chromosome Xp22.32 and the coding sequence is divided into nine exons. The OA1 gene codes for a 404 amino acid protein thought to be a melanosomal transmembrane glycoprotein. The OA1 protein is similar to the G protein-coupled receptors,but it's exact function is not clear. There are many mutations and deletions of the OA1 gene have been found.

[Objective]To evaluate the effects of Austin surgery for mild and moderate juvenile hallux valgus. [Method]From November 2005 to Januuary 2007,16 juvenile hallux valgus patients(28 feet)with average of 17.8 years(range,17 to 19 years)were treated with Austin surgery.The X-ray films of all patients were obtained before operation,and twelve months,fifteen months after operation.The hallus valgus angle,intermetatarsal angle,proximal articular set angle,and distal articular set angle were measured and analyzed on radiographs.The surgical outcome was evaluated combined with the Gu Xiang-jie's score.All pamameters were statistically analyzed. [Result]All the patients were completely followed up.Hallax valgus angle reduced from 26.3?1.19 to 11.7?0.40,intermetatarsal angle reduced from 14.1?0.82 to 7.2?0.85,proximal articular set angle from 12.7?0.28 to 6.4?0.54(all P

BACKGROUND:There are many methods that can repair Pilon fracture, but the effects are not ideal. With the development of science and technology, fundamental change of fracture fixation principle and innovation of technology and idea has brought new opportunities for Pilon fracture repair. Biological immobilization technology can further reduce the further damage to blood supply of bone outer membrane on the fracture end, do not disturb biomechanical environment of fracture healing, and is the new trend of present research and development. OBJECTIVE:To investigate the effect of locking compression plate fixation for repair of Pilon fracture using biological fixation technique. METHODS:Clinical data of 76 patients with Pilon fracture treated using locking compression plate fixation in the Nanhai District Economic Development Zone Guanyao Branch of the People’s Hospital from June 2008 to December 2013 were retrospectively analyzed. There were 49 males and 27 females, at the age of 39.5 years on average (range from 19 to 60 years). According to Ruedi-Algower classification, there were 54 cases of type II and 22 cases of type III. In accordance with biological fixation technique, locking compression plate fixation was applied to treat Pilon fracture. Folowing treatment, they were regularly folowed up. Reduction quality was assessed by Burwel-Charnley radiological criteria. X-ray films were reviewed to observe fracture healing. During final folow-up, ankle function was evaluated according to Baird-Jackson score. RESULTS AND CONCLUSION:A total of 76 patients were folowed up for 6 to 24 months. Reduction quality assessed by Burwel-Charnley radiological criteria was as folows: anatomic reduction of 68 cases, reduction of 8 cases, 71 cases of one-stage wound healing, and 5 cases of wound healing after dressing change, with the rate of one-stage healing of 93%. Fractures of al patients were healed. The healing time was 4 to 8.5 months, averagely 6.25 months. During final folow-up, ankle function assessed by Baird-Jackson score was as folows: there were 69 excelent cases, 5 good cases and 2 average cases. These results indicate that locking compression plate fixation for Pilon fracture obtained good stability, could effectively avoid the damage of fracture end blood supply, shorten the healing time; it was simple to operate, had smal injury to soft tissue, and was an effective fixation method to repair Pilon fracture.

Research on novel pullulanase has major significance on the domestic industrialization of pullulanase and the breakdown of foreign monopoly. A thermophilic bacteria LM 18-11 producing thermostable pullulanase was isolated from Lunma hot springs of Yunnan province. It was identified as Anoxybacillus sp. by 16S rDNA phylogenetic analysis. Full-length pullulanase gene was cloned from Anoxybacillus sp. LM18-11. The optimum temperature of the pullulanase was between 55 and 60 degrees C with a half-life as long as 48 h at 60 degrees C; and its optimum pH was between 5.6 and 6.4. V(max) and K(m) of the pullulanase was measured as 750 U/mg and 1.47 mg/mL, which is the highest specific activity reported so far. The pullulanase crystals structure showed a typical alpha-amylase family structure. The N-terminal has a special substrate binding domain. Activity and substrate binding were decreased when the domain was deleted, the V(max) and K(m) were 324 U/mg and 1.95 mg/mL, respectively. The pullulanase was highly heterologous expressed in Bacillus subtilis by P43 promoter. The extracellular enzyme activity was 42 U/mL, which increased more than 40 times compared to the initial strain. This pullulanase has good application prospects.
Anoxybacillus ; classification ; enzymology ; China ; Glycoside Hydrolases ; metabolism ; Hydrogen-Ion Concentration ; Phylogeny ; RNA, Ribosomal, 16S ; genetics ; Temperature

Adult ; Carcinoma, Papillary ; pathology ; surgery ; Female ; Follow-Up Studies ; Humans ; Middle Aged ; Thyroid Gland ; pathology ; surgery ; Thyroid Neoplasms ; pathology ; surgery ; Thyroidectomy ; methods ; Video-Assisted Surgery ; methods ; Young Adult

BACKGROUND:Different methods to remove immunogenicity have different effects on the spatial microstructure of antigen-extracted heterologous bone.
OBJECTIVE:To compare the microstructure of the antigen-extracted heterologous bone via different methods to provide experimental data for tissue engineering industrialization.
METHODS:Fresh cancellous bones extracted from adult sheep vertebrae were prepared into cylinders. Their long axis direction was the same with orientation of the trabeculae. After vibration washing and different-frequency ultrasound rinsing, the cylinder samples were randomly divided into three groups:in physical calcined group, the samples were defatted, decellularized and deproteinized sequential y using methanol/chloroform and hydrogen peroxide, then bathed in sodium pyrophosphate and directly calcined at 1 000 ℃ for 3 hours;in chemical group, the samples were defatted, decellularized and deproteinized sequential y using methanol/chloroform and hydrogen peroxide;in control group, the samples were dried natural y at room temperature. Microstructure of the samples in each group was analyzed and compared through determination of porosity, scanning electron microscopy observation, X-ray diffraction analysis, X-ray atomic spectroscopy elemental analysis microscopic spatial structure.
RESULTS AND CONCLUSION:The physical calcined and chemical groups maintained natural network pore system to different extents. The size of the large pore was 50-600μm and that of the smal one was about 2μm. The porosity was 55%to 70%. Hydroxyapatite was the main component of the physical calcined group which was determined by X-ray diffraction, and a smal amount of theβ-Tricalcium phosphate was also determined. In the chemical group, the main component was only hydroxyapatite. The three-dimensional spatial structures of the deproteinized cancellous bones were not damaged greatly, and they had a natural pore network system. Antigen component of xenogeneic cancellous bone can be more thoroughly removed by physical calcination step. The scaffold material made by antigen-extracted heterologous bone may satisfy the demands for bone tissue-engineering scaffolds.

Objective To detect the changes of peripheral blood T lymphocyte subsets in patients with hand,foot and mouth disease (HFMD) and investigate its clinical significance.Methods Three hundred and eighty-six patients with HFMD and 78 healthy children were detected the peripheral blood T lymphocyte subsets levels using the flow cytometry (FCM).The patients were divided into 325 common patients and 61 critically ill patients according to the severity of disease.Among the 386 patients,264 were in infection stage and 122 were in recovery stage.Compared the differences of peripheral blood T lymphocyte subsets levels in patients and healthy controls,common patients and critically ill patients,infection patients and recovery patients respectively.Results The patients' numbers of CD3 +,CD4 +,CD8 + cells and CD4 +/CD8 + ratio were (47.4 ± 10.6) ％,(24.0 ±8.0) ％,(23.2 ± 7.4) ％ and 1.0 ± 0.5 respectively.These parameters were significantly different with those in the control group ((68.4±7.5)％,(38.2 ±6.9)％,(18.8 ±4.6)％ and 2.0 ±0.4 respectively;t =3.16,4.62,2.23 and 2.51 respectively,P ＜ 0.05).The common patients' numbers of CD3 +,CD4 +,CD8 + cells and CD4+/CD8 + ratio were (53.0 ±9.8)％,(26.5 ±7.9)％,(20.4±7.5)％and 1.3 ±0.6,which had significant differences compared with those of the critically ill patients ((42.3 ± 10.9) ％,(18.7 ± 4.7) ％,(24.2 ± 7.4) ％ and (0.7 ± 0.4) respectively; t =2.25,2.47,1.91 and 2.32 respectively,P ＜ 0.05).The infection patients' CD3 +,CD4 +,cell numbers and CD4 +/CD8 + ratio were (45.3 ± 10.5) ％,(21.6 ± 8.4) ％and 0.9 ± 0.5.These parameters were significantly different with those of the recovery patients ((54.7 ±9.9)％,(27.5 ± 9.1)％ and 1.4 ± 0.6 respectively; t =2.41,1.87 and 2.92 respectively,P ＜ 0.05).Conclusion The cellular immunity of patients with HFMD was impaired.The T lymphocyte function was suppressed,and the level of suppression was positively correlated to severity of the illness.

Objective To evaluate the accuracy of pyrosequencing for the mutation detection of katG gene in isoniazid resistance in Mycobacterium tuberculosis using Meta-analysis.Methods Searching PubMed,Web of Science,Elsevier,and China National Knowledge Infrastructure (CNKI),Weipu and WANFANG DATA to obtain the relevant English and Chinese-language articles,respectively.A written protocol and explicit study selection criteria was followed.Quality of included trials was assessed by QUADAS (quality assessment of diagnostic accuracy studies).Subsequently,the characteristics of the included articles were appraised and extracted.Heterogeneity of the included articles was tested by using STATA 10.0,which was used to select proper effect model.The fixed effects model was adopted using Meta-Disc software.Finally,sensitivity analysis was performed.Results Totally 114 research papers were collected and 9 articles were selected.The accordance between pyrosequencing and conventional sequencing result was 100％.Eight studies were involved including 945 specimens when katG gene was detected.The overall sensitivity and specificity were 0.77 (0.73,0.80) and 1.00 (0.99,1.00),respectively.The area under the SROC was 0.9882.As inhA gene was detected,the overall sensitivity and specificity were 0.19 (0.15,0.24) and 1.00 (0.98,1.00).The test was stable.Conclusions Our meta-analysis reveals that pyrosequencing is a highly specific tool for detection mutation of katG gene of isoniazid resistance.This result suggests that it is useful for screening of isoniazid resistance in diagnostic test.(Chin J Lab Med,2013,36:329-332)