Objective:To investigate the mechanisms of Mitoxantrone(MTN) induced apoptosis in human acute myloid leukemia HL 60 cells.Methods:Exposured log phase growth HL 60 cells to different Mitoxantrone concentrations for different time respectively and then test the inhibitive effect by modified tertrozalium salt(MTT) assay.Morphologic evidence for apoptosis of MTN induced on HL 60 cells was determined by transmission electron microscope.The detection of MTN induced internucleosamal DNA fragmentation by agurose gele lectrophoresis.The effects on HL 60 cells proteins(Bcl 2,Bax) implicated in apoptosis were determined by Flow cytoetric.Results:(1)The antiproliferative effects were observed following exposure micromilligram level of MTN.It shows a very substantial differences in the dose and duration dependency of the observed antiproliferative and cytotoxic effects.(2)The HL 60 cells treated by MTN are observed apoptosis characteristic morphological changes such as complete cell membrane,nuclear fragmention apoptosic bodies and found about 200 bp trapezoidal belt with DNA electrophoresis.(3)The protein test results of Bcl 2 and Bax indicate that when the time of MTN treating HL 60 cells is the same,Bcl 2 protein and the ratio of Bcl 2 protein and Bax protein(Bcl 2/Bax) descend along with the ascending concentration of MTN.Bax protein has no connection with the concentration of MTN.When the concentration of MTN treating HL 60 cells are the same.The ratio of Bcl 2/Bax descends as the time of MTN treating HL 60 cells is prolonged.Conclusion:MTN has the function of inducing apoptosis on HL 60 cells with descent of Bcl 2 and Bcl 2/Bax.The regulation pathway of Bcl 2 may be a mechanism of MTN induced apoptosis on HL 60 cells.

Objective:To investigate the effect of IGN4 gene trasfection on SGC-7901 cells,and the possible mechanism for its anti-tumor effect .Methods:Ad-ING4 was obtained by gene recombination and packaging technique in vitro.The expression of ING4 mRNA and protein were analyzed by RT-PCR and western-blot respectively.The effect of Ad-ING4 on growth of SGC-7901 cells was detected by MTT.Apoptotic cells were detected by Laser Scan Co-focal Microscope (LSCM).The expression of p21 in SGC-7901 cells was analyzed by western-blot.Results:After infection with Ad-ING4,the expression of ING4 mRNA and protein were showed in SGC-7901 cells detected.The proliferation of SGC-7901 cells was inhibited significantly(P

Objective:To explore the role of static posturography in the assessment of fatigue due to flight tasks.Methods:Thirtymale college students were asked to perform simulated flight tasks consecutively forfour hours.Meanwhile their statie posturography and tasks performance would be repeatedly measured during the task-load at end of every hour.Based on the changed significantly parameters,the static balance index would be built by principle component analysis.Then its correlation with task-load level would be further analyzed by curve estimation.Results:Static postural control declined significantly under effect of simulated flight tasks.With task load sustaining,static balance index increased significantly and correlated linearly with duration of task load (R2=0.949).Besides,there was quadratic relationship between the change of multi-tasks performance and duration of task load (R2=0.968).And correlation of multi-tasks performance with static standing balance level also had been proved to be quadratic (R2=0.976).Conclusions:Static posturography correlated linearly with flight task-load level,which could reflect fatigue level caused by task load.

BACKGROUND: Bone marrow mesenchymal stem cell transplantation is superior to neural stem cell transplantation to repair spinal cord injury; however, the therapeutic effect is unstable and possibly related to microenvironment.OBJECTIVE: To study the differentiation of cultured in vitro bone marrow mesenchymal stem cells (BMSCs) into neurocytes by establishing a microenvironment and to observe differential expression of protein.DESIGN, TIME, AND SETTING: Observational contrast study was performed at the Laboratory of Neurobiology, Basic Medical College, Harbin Medical University from July 2005 to May 2007.MATERIALS: Adult Wistar rats and newborn fetal rats were used in this study.METHODS: Spinal cord was obtained from fetal rats to culture neurocytes. While, BMSCs were separated from bone marrow of adult rats, and they were then cultured in vitro, proliferated, and labeled with red fluorescin PKH26. BMSCs and neurocytes were individually cultured in the BMSCs group and the neurocyte group, respectively. In addition, BMSCs and neurocytes were co-cultured in vitro in double-layer culture dish in the co-culture group and the layered combination group, respectively.MAIN OUTCOME MEASURES: The obtained cells after 7-day culture were immunofluorescently detected by neuron-specific enolase (NSE) and glial fibrillary acidic protein (GFAP). Surface enhanced laser desorption/ionization time of flight mass spectrometry (SELDI-TOF-MS) technique was used to analyze associated protein that was apparently changed during the differentiation from BMSCs into neurocytes.RESULTS: Seven days after co-culture, BMSCs were morphologically shared like neurocytes. Immunofluorescence indicated that NSE- and GFAP-positive ratios of BMSCs in the co-culture group were significantly higher than the layered combination group (P < 0.05); while, the ratios in the layered combination group were significantly higher than BMSCs alone group (P < 0.05). Five protein expressions were changed during the differentiation from BMSCs into neurocytes, for example, TIP39_RAT and CALC_RAT expressions increased in the layered combination group, which were 5.344 and 2.805 times as the primary expressions; INSL6_RAT, PNOC_RAT, and PCSKI_RAT expressions decreased, which were 0.380, 0.499, and 0.437 times as the primary expressions.CONCLUSION: By a microenvironment, both BMSCs and neurocytes in the co-culture and layered combination groups can differentiate into neuroblasts; while, contact differentiation ratio is higher than non-contract one. The differentiation is closely related to five proteins, including TIP39_RAT, CALC_RAT, INSL6_RAT, PNOC_RAT, and PCSK1_RAT.

OBJECTIVE: Treating Class II subdivision malocclusion with asymmetry has been a challenge for orthodontists because of the complicated characteristics of asymmetry. This study aimed to explore the characteristics of dental and skeletal asymmetry in Class II subdivision malocclusion, and to assess the relationship between the condyle-glenoid fossa and first molar. METHODS: Cone-beam computed tomographic images of 32 patients with Class II subdivision malocclusion were three-dimensionally reconstructed using the Mimics software. Forty-five anatomic landmarks on the reconstructed structures were selected and 27 linear and angular measurements were performed. Paired-samples t-tests were used to compare the average differences between the Class I and Class II sides; Pearson correlation coefficient (r) was used for analyzing the linear association. RESULTS: The faciolingual crown angulation of the mandibular first molar (p < 0.05), sagittal position of the maxillary and mandibular first molars (p < 0.01), condylar head height (p < 0.01), condylar process height (p < 0.05), and angle of the posterior wall of the articular tubercle and coronal position of the glenoid fossa (p < 0.01) were significantly different between the two sides. The morphology and position of the condyle-glenoid fossa significantly correlated with the three-dimensional changes in the first molar. CONCLUSIONS: Asymmetry in the sagittal position of the maxillary and mandibular first molars between the two sides and significant lingual inclination of the mandibular first molar on the Class II side were the dental characteristics of Class II subdivision malocclusion. Condylar morphology and glenoid fossa position asymmetries were the major components of skeletal asymmetry and were well correlated with the three-dimensional position of the first molar.
Anatomic Landmarks ; Cone-Beam Computed Tomography ; Crowns ; Head ; Humans ; Malocclusion* ; Molar ; Orthodontists ; Temporomandibular Joint*

Objective To investigate the spatial distribution and growing trend of 438 human infection with the H7N9 avian influenza virus in mainland China,and to provide evidence for developing scientific prevention and control strategies.Methods 438 human infection with the avian influenza A (H7N9) cases from February 2013 to May 2014 in mainland China were studied and data collected to establish a database for the development of geographic information system.Trend surface analysis and spatial autocorrelation analysis were used to study the spatial distribution.Descriptive epidemiological method was utilized to analyze the demographic characteristic.Results From June 2013 to May 2014,cases had an overall national increase,but significantly decreasing in Shanghai.A trend surface was established for human infection with avian influenza A (H7N9) in the mainland of China,showing that the incidence was increasing obviously from north to south and the line slope declined from west to east.Distribution pattern of the cases varied within different time series and regional levels.The overall Moran' s I coefficient of the provincial level from February to May in 2013 and the coefficient of the city level from June 2013 to May 2014 were 0.144 718 and 0.117 468,respectively,with the differences statistically significant (P＜0.05).According to the analysis of the local autocorrelation and hot spot,northern Zhejiang and southern Guangdong showed high spatial clusters of human infection with avian influenza A(H7N9) (Z＞2.58).Conclusion From February 2013 to May 2014,the spatial correlation at the provincial level decreased.However,the spatial correlation and the numbers of hot spots at the city level were both increasing.Effective measures should be taken accordingly,following the distributive characteristics.

Objective To investigate the high risk factors and emergency treatments to the patients with intraoperative acute encephalocele caused by delayed intracranial hematomas at non operating region. Methods The clinical data of 40 patients with intraoperative acute encephalocele caused by delayed intracranial hematomas at non operating region from January 2000 to December 2013 were analyzed retrospectively. Summarized the high risk factors and emergency treatments in this case. Results The 22 cases with contrecoup injury. 14 cases with extensive contusion of brain,16 cases with skull fracture and 10 cases with small intracranial hematoma (Volume <15mL).The delayed intracranial hematomas to the acute encephalocele include,32 cases at the offside. And 24 cases with epidural hematoma. 32 cases had to undergo reoperation, survived 16 cases. The total death rate was 60%. Conclusion The high risk factors are ex-tensive contusion of brain, offside skull fracture and the delayed intracranial hematomas at non operating region. Under-standing Its high risk factors in clinical, with much more foreseeability, and sufficient preoperative preparation, right in-traoperative treatment, a scientific system comprehensive treatment postoperation can save the patients' life in maximum.

Objective:To develop a single-tube one-step multiplex nested real-time reverse transcription polymerase chain reaction (RT-PCR) assay for the simultaneous detection of 2019-nCoV, influenza A virus, influenza B virus and internal-control with human-derived gene.Methods:This study included 30 positive specimens for 2019-nCoV nucleic acid detection and 336 screening specimens collected from the arrivals at Guangzhou Baiyun Airport between February 2020 and February 2022. Sixty-four positive specimens of other respiratory pathogens were also collected from the arrivals at Guangzhou Baiyun Airport during the three-year period before the occurrence of COVID19 outbreak in 2020, and 7 positive viral strains of respiratory pathogens were provided by collaborative laboratories. In order to establish a set of multiplex nested real-time RT-PCR assay, a group of primers and probe combinations for a multiplex nested real-time RT-PCR was designed and screened according to a selection of nucleotide conserved regions of the ORF and N genes of 2019-nCoV and the M gene of influenza A and B viruses, while nested amplification primers and probe for the internal-control with human-derived gene were introduced. Then the prepared pseudovirus-positive quality control and sample discs were applied to evaluate the sensitivity and specificity. Clinical specimens were performed to validate the applicability of the method.Results:The results show that the established one-step multiplex nested real-time RT-PCR assay can specifically detect 2019-nCoV and influenza A and B viruses, with the limit-of-detection of about 125 copies/ml for 2019-nCoV and about 250 copies/ml for influenza A and B viruses. Totally 101 positive samples of various respiratory pathogens were detected, showing that the detection sensitivities of 2019-nCoV and influenza A and B viruses were 96.67%, 92.86% and 96.15%, respectively, with the specificity of 100%. No false-positive detection was found in the applied detection of more than 300 clinical samples.Conclusions:A one-step multiplex nested real-time RT-PCR assay for 2019-nCoV, influenza A and B viruses and human-derived gene internal-control was developed. The assay has good sensitivity and specificity and can be used for rapid screening of 2019-nCoV and influenza A and B viruses in high-volume samples.

Objective To investigate the CT features of early infection stage of thoracic and pulmonary paragonimiasis. Methods Medical records of 56 patients with thoracic and pulmonary paragonimiasis from January 2010 to June 2017 were collected, and the patients were diagnosed and treated at Yongjia County People's Hospital, and the results of laboratory examination and CT imaging features were analyzed retrospectively. Results The absolute value of eosinophils in peripheral blood of 56 patients was (5.61 ± 3.18) × 109/L, and the percentage of eosinophils was (35.90 ± 19.16)％, all of which increased to varying degrees. Forty-two patients had different degrees of pleural effusion and 52 cases with lung lesions. Lung lesions demonstrated one or several kinds of foci at the same time, randomly distributed in the lung field, mostly located in the sub-pleural lung tissue. There were 12 cases with pulmonary ground glass shadow, 4 cases with peribronchitis, 31 cases with pulmonary invasive lesions and 28 cases with pulmonary nodular/strip shadow. The size of most nodules were 0.5 - 1.0 cm, accompanied with halo sign. Conclusions The CT features of early infection stage of thoracic and pulmonary paragonimiasis are diverse. The size of 0.5 - 1.0 cm lung nodules with halo sign has certain characteristics in the diagnosis of paragonimiasis. Peribronchitis, infiltrative lesions, pleural effusion and increased peripheral blood eosinophil percentage can suggest diagnosis.