AIM:To study the effect of chronic corticosterone ( CORT) injection on the depression-like behav-iors and the brain glycogen level in mice.METHODS:Male C57BL/6N mice (n=40) were randomly divided into nor-mal control group and model group.The mice in model group were subcutaneously consecutively injected with CORT for 4 weeks.The mouse model of chronic stress depression was constructed.The forced swim test and open field experiment were conducted to prove chronic stress model.The serum level of CORT in the mice was measured by radioimmunoassay.The protein levels of hippocampal synaptophysin ( SYP) and brain-derived neurotrophic factor ( BDNF) were detected by West-ern blot.Hippocampus glycogen, glycogen synthase and glycogen phosphorylase were determined by indirect fluorescence measurement.RESULTS:Compared with normal control group, the immobility time of the forced swim test in model group was significantly lengthened (P<0.01), and the ability of spontaneous activity was reduced (P<0.01), indicating that chronic CORT injection induced depression-like behaviors in mice.The CORT level increased significantly (P<0.01) in model group.CORT injection decreased the protein expression of hippocampal SYP and BDNF (P<0.01), reduced hipp-ocampal glycogen level (P<0.05) and glycogen synthase activity (P<0.05), and increased glycogen phosphorylase ac-tivity (P<0.05).CONCLUSION:Chronic CORT injection causes hippocampal neuron damage and induces the depres-sion-like behaviors of mice, which may be associated with decreasing hippocampal glycogen level by CORT.

Objective To study the effects of long-term injection of corticosterone (CORT) on the hippocampal astrocytes and synaptic plasticity in mice.Methods Male C57BL/6N mice (n=40) were randomly divided into control group and model group.Mice in the model group were treated with subcutaneous injection of CORT for 4 weeks to generate chronic stress depression model.Chronic stress model was proved to be established by tail suspension test and sucrose preference test and serum level of CORT was determined by radioimmunoassay.Protein expression levels of hippocampal synaptophysin (SYP) and postsynaptic density-95 (PSD-95) were detected by Western blot.Somal volume and protrusion length of glial fibrillary acidic protein-positive astrocytes were assayed by immunocytochemistry and quantitative stereological techniques.Results Immobility time in model group ((137.95±6.22) s) was significantly extended in comparison with that in the control group ((114.05 ± 4.12) s) (P＜ 0.01).Sucrose preference in the model group (62.42 ± 6.75)％ was lower than that in the control group (86.52±5.08)％ (P＜0.01).CORT levels in model group ((11.48±0.62) ng/ml) was significantly increased compared with that in the control group ((1.11±0.05) ng/ml) (P＜0.01).Hippocampal SYP (0.54±0.04) and PSD-95 (0.57±0.07) expression levels in model group were lower than those in the control group (0.99±0.14),(1.03±0.10) (P＜0.01).Somal volume in the model group ((132.04±9.23) μm3) and protrusion length ((1.39± 0.05) × 107 μm) was lower than that in the control group ((168.49±9.01)μm3),(1.77±0.10) × 107 μm) (P＜0.05,P＜0.01).SYP and PSD-95 expression level was found to be positively correlated with the reduction of the protrusion length(r=0.660,P＜0.01;r=0.614,P＜0.01)in astrocytes.Conclusion The results suggest that depression-like behavior-in-duced by long-term CORT treatment is possibly caused by the alternation of the synaptic plasticity associated with the reduction of the reducing the protrusion length.

Objective:To investigate the relationship of the changes of peripheral bloos T cell subsets and NK cell with non-Hodgkin's lymphoma(NHL).And to investigate the change of the cell immune function of NHL and chronic lymphadenitis.Methods:Peripheral blood T cell subsets,NK cell with NHL,chronic lymphadenitis patients and 50 normal controls were detected quantitatively with FCM.Results:Compared with the normal controls,the number of CD3~+,CD4~+T cell,CD4~+/CD8~+ ratio markedly reduced,while those of CD8~+T cells increased.These were no significant changes in NK cell.Compared with the group of chrnic lymphadenitis,the number of CD8~+T cell,NK cell markedly increased,while these were no significant changes in CD3~+,CD4~+T cell and reduction of CD4~+/CD8~+ ratio.Conclusion:NHL patients cell function was suppressed.The detection of T cell subsets and NK cells are clinically valuble on the diagnosis,treatment and prognosis of NHL.

Objective:To investigate the changes in the expression of COX-2 in acute spinal cord injury of rats. Methods:Sixty adult SD rats were randomly divided into two groups: Trauma group (n=48) subjected to laminectomy and bounce of spinal cord; control group (n=12) only received laminectomy. The activity of COX-2 was detected using immunohistochemistry and Western blot analysis in cytoplasm of spinal cord. Results:The expression of COX-2 increased at 2-hour after injury and reached the top level at 24-hour. The expression of COX-2 dropped at 48-hour after injury and returned to basal level at 72-hour. Conclusion: The expression of COX-2 could be regarded as an index of inflammation on acute trauma spinal injury. Inhibition of COX-2 might be an new therapeutic method for spinal cord injury.

Objective To explore the relation of the expressions of MDM2 and VEGF in osteosarcoma with the pathological parameters and prognosis of the tumor.Methods The expressions of MDM2 and VEGF were detected with immunohistochemical(SP) method in specimens from 56 cases of osteosarcoma.The correlation between the expressions of MDM2,VEGF and pathological grade,metastasis and prognosis was analyzed statistically.while 8 cases of fibrous dysplasia of bone were used as negative control group.Results The positive rates of MDM2 and VEGF in osteosarcoma were 64.3%(36/56) and 67.9%(38/56),respectively .MDM2 and VEGF didn't express in negative control group.The expression of MDM2 and VEGF were not significantly correlated to the pathological grades of the osteosarcoma,but which were significantly correlated with tumor metastasis and prognosis(P

ObjectiveTo investigate the effects of controlled subcutaneous analgesia(PCSA) with sufentanil in patients underwent abdominal surgery and the occurrence of adverse reactions. Methods90 patients underwent abdominal surgery were randomly divided intothree groups with 30 cases each. Group Ⅰ :sufentanil 0. 04μg · kg-1 ·h-1 for postoperative analgesia; Group Ⅱ : sufentanil 0. 06μg · kg-1 · h-1 for postoperative analgesia; Group Ⅲ :sufentanil 0.08μg/kg · h for postoperative analgesia;PCSA started at the end of operation with catheter buried in deltoid muscle. Visual analgesia scale(VAS) ,Rasmay scale and side effects were recorded at 4,8,16,24 and 48h after operation. ResultsVAS scores decreased significantly in group Ⅱ and group Ⅲ compared with that in group Ⅰ ( all P ＜ 0.05) ;There were no differences of Ramsay scores between groups ( all P ＞ 0. 05) ;There were three cases of respiratory depression in group Ⅲ. ConclusionPCSA with sufentanil (0.06μg/kg) had exact analgesic effects for postoperative abdominal surgery patients with less adverse reactions.

Two Kinds of monoclonal antibodies (McAbs), Ft9 and Ft9t44, have been produced using the vaccine strain of Franciisela.tularensis as an antigen.The McAbs. Ft9 and Ft4,4, were isotyped to be IgG2b and IgM respectively Ft9 was found to be directed against outer membrane protein of F. tularensis, while Ft44 directed against lipopolysaccharide. The McAbs have been identified in detecting F. tularensis cells in an enzyme-linked immunosorbent assay. Ft9 was able to react with the bacterium in agglutination test and fluorescent antibody stain with no cross-reaction with other bacteria was found.

Objective To investigate the application of magnetic resonance imaging (MRI) fluid-attenuated inversion recovery vascular hyperintensities (FVH) for the diagnosis of transient ischemic attack (TIA). Methods Consecutive 218 inpatients for TIA from May 2011 to July 2013 were reviewed with gender, age, cardiovascular risk factors, TIA or a history of stroke, TIA duration, and calculate the ABCD2 scores. All patients accepted MRI and MRA within 24 hours of symptom onset. FVH positive patients would follow up MRI and MRA within 7 days. All the patients were followed up in 90 days. Results FVH was identified in 45 patients (21%), 15 cases of them was found diffusion weighted imaging (DWI) hyperintensities on the same sides. The prevalence of atrial fibrillation (AF, P<0.001), DWI positive (P= 0.010) and arterial occlusive lesions (AOL, P=0.003) were more in the FVH positive patients than in the negative ones, while the duration of symptoms was shorter (P=0.010). Multivariate Logistic regression analysis showed that AF (OR=7.17, 95% CI: 2.71-18.4), AOL (OR=4.93, 95% CI: 3.53-12.6) and hemiplegic (OR=2.84, 95% CI: 1.21-7.42) independently associated with FVH. 7 days after the onset, FVH was not found in 15 patients (65%, transient FVH), in whom the prevalence of AF was more (P=0.020), and AOL was less (P<0.001). A total of 197 patients (90%) were successfully followed up. In the FVH-positive patients, 5 cases developed into recurrent TIA and 6 into ischemic stroke (IS), focused on the the same sides of FVH; while the FVH-negative patients, 2 cases developed into recurrent TIA and 5 into IS. COX proportional hazard analysis showed that FVH (HR=3.64, 95% CI: 1.08-12.6) and AOL (HR=3.82, 95% CI: 1.07-15.8) independently associated with the recurrence of TIA or IS. Conclusion FVH can be helpful for the diagnosis of TIA and predictions for recurrent TIA or IS after a TIA.

Objective To investigate the effect of different medical standards for the urinary system on the enlistment of pilots between PLAAF and USAF , and offer support to amendment .Methods Data on pilots′final enlistment between 2012 and 2015 were analyzed , and results of physical examinations of the urinary system were compared according to differ -ent medical standards .Results One hundred and twenty teenagers enrolled in this examination were disqualifiied due to defects of the urinary system while 97 applicants were qualified after comprehensive assessment of the urinary system .The main problems with the urinary system that affected results of pilots′enlistment were nephroptosia , renal cyst , microscopic hematuria , renal calcified foci and calculus .Conclusion Medical standards for the urinary system are different between PLAAF and USAF, especially those for nephroptosia , renal cyst and microscopic hematuria .The medical standards directo-ry about the urinary system approved by USAF can serve as a reference during our revision of current medical enlistment standards.

Objective To investigate and analyze the reasons of fa0ilure in external quality assessment(EQA) for routine chemistry and provide the basis for the corrective and preventive actions.Methods Based on the network system of NCCL EQA the reasons of failure in 2013 national routine chemistry external quality assessment program were investigated,among which the reasons were classified and analyzed with seven sources of problems which were clerical errors,methodological problems,equipment problems,technical problems,EQA materials problems,EQA Evaluation problems and unable to explain after investigation.Results The return rate of this root cause investigation for each analyte ranged from 33.3％ to 80.0％.The major reason for unacceptable analyte included clerical errors (6.5％) (decimal point position error:70.1％;unit error:20.8％;instrument or method coding error:8.1％),methodological problems (45.1％)(calibration:54.2％;reagent:38.0％;EQA material:7.8％),equipment problems (28.5％) (no regular maintenance:98.0％;pipeline error:2.0％),technical problems (8.2％) (do not follow SOP:80.4％;EQA material redissolve error:10.6％;placing order error:9.0％) and unable to explain (11.7％) (system error:68.2％;random error:31.8％).There were no EQA materials problems or EQA Evaluation problems in this survey.Analysis systems' grouping statistics were implemented for seven analytes including sodium,chlorine,phosphorus,direct bilirubin,total iron binding capacity,copper,and zinc.Unsatisfied EQA proportions of mating system were lower than nonmatching ones for the majority of analytes.Conclutions Further work on EQA should be undertaken by clinical laboratories.Laboratories should use reagents with high quality as well as improve the operation technology and sense of responsibility.Only in this way,can the accuracy and reliability of testing results be guaranteed.