BACKGROUND:Studies have shown that the changes of extracellular matrix in degenerative intervertebral disc tissues mainly present as the decrease of col agen type Ⅱ and proteoglycan contents and the increase of col agen type Ⅰ content. OBJECTIVE:To explore the effect of adeno-associated virus-mediated bone morphogenetic protein 2 gene on nucleus pulposus Ⅰ and Ⅱ col agen levels in rabbit degenerative intervertebral disc tissues. METHODS:L 2-3 , L 3-4 , L 4-5 and L 5-6 lumbar discs of 12 New Zealand white rabbits were punctured to establish interverbral disc degeneration model. Subsequently, 12 rabbits were randomly divided into three groups, four rabbits in each group. The intervertebral discs in the adeno-associated virus-mediated bone morphogenetic protein 2 group were injected with the adeno-associated virus-mediated bone morphogenetic protein 2 gene, the intervertebral discs in the adeno-associated virus group were injected with adeno-associated virus only, while the discs in the normal saline group were injected with normal saline. Al rabbits were sacrificed after injected for 8 weeks, and the L 2-3 , L 3-4 , L 4-5 and L 5-6 lumbar discs of each rabbit were col ected, paraffin-embedded and sliced. The histological changes of nucleus pulposus were observed with hematoxylin-eosin staining, and the immunohistochemistry was used to detect the col agen type Ⅰ and Ⅱ expressions in nucleus pulposus. Semi-quantitative analysis was performed. RESULTS AND CONCLUSION:Hematoxylin-eosin staining showed that the nucleus pulposus in the intervertebral disc tissues was less in the adeno-associated virus-mediated bone morphogenetic protein 2 group, the nucleus pulposus was in single or clustered distribution with clear nucleus structure and without fibrous tissue fil ing. The tissue structures of nucleus pulposus were the same in the adeno-associated virus group and normal saline group, the cellnumber in nucleus pulposus was smal , the nucleus pulposus was shrunken and shriveled, and the cells were fil ed with fibrous tissue and arranged disorderly. Immunohistochemistry staining showed the expression of col age type Ⅰ in the intervertebral disc nucleus pulposus of adeno-associated virus-mediated bone morphogenetic protein 2 group was higher than that of the adeno-associated virus group and normal saline group (P<0.05);the expression of col age typeⅠ in the intervertebral disc nucleus pulposus of adeno-associated virus-mediated bone morphogenetic protein 2 group was lower than that of the adeno-associated virus group and normal saline group (P<0.05). The results indicate that adeno-associated virus-mediated bone morphogenetic protein 2 can inhibit the expression of col agen type Ⅰ in the intervertebral disc nucleus pulposus, promote the expression of col agen type Ⅱ. Maintaining the content of col agen in intervertebral disc can keep the histological structure and morphology of intervertebral disc, stabilize the environment for nucleus pulposus cellgrowth, and delay the intervertebral disc degeneration.

Objective To explore the effects of air pollution on children's nonspecific immune function,and find the sensitive indexes reflecting the earlier damages of human health induced by air pollution.Methods The data on air pollution were provided by Benxi and Shenyang environment protective bureaus. 300 children in grade 1 and grade 6,half for girls and half for boys were selected from area with slight air pollution and area with heavy air pollution in Shenyang and Benxi respectively by cluster sampling method.The contents of SIgA and the activities of bacteriolytic enzyme in saliva of children were measured by radioimmunoassay and agar spread assay respectively.Results The difference of the contents of saliva SIgA was observed in children in grade 1 between area with heavy air pollution(70.60 ?g/ml)and area with slight air pollution(97.77 ?g/ml),P

Objective To develop the methods for determination of nitromethane,nitroethane,1-nitropropane,2-nitropropane in the air of workplace. Methods Nitromethane,nitroethane,1-nitropropane,2-nitropropane in the air of workplace were collected by active carbon tube,desorbed in ethyl acetate solution and detected by capillary gas chromatography (GC-FID). Results The linear concentration range of nitromethane,nitroethane,1-nitropropane,2-nitropropane was 43.2-345.3,177.6-1 421.0,68.5-547.7,24.1-192.4 ?g/ml respectively and the relative standard deviation was 1%-5%. Sampling efficiency was 100%,desorption efficiency was 91%-93%. The sample could be resaved at 4-10 ℃ for 5-7 days. Conclusion The method is applicable to determination of nitromethane,nitroethane,1-nitropropane,2-nitropropane in the air of workplace.

AIM To investigate the possible role of the mitochondrial transmembrane potential (??m) and caspase 3 in arsenic trioxide(As 2O 3)-induced apoptosis of cancer cells. METHOD Namalwa, SGC7901 and Bcap37 cell lines were used as in vitro models. Apoptosis was confirmed by sub-G 1 cells content as well as phosphatidylserine(PS) externalization. The ??m was detected on flow cytometry through double staining of Rhodamine 123(Rh123) and popidium iodide(PI). In addition, the effect of DEVD-CHO, a selective inhibitor of Caspase 3, on As 2O 3-induced apoptosis was studied. RESULT The As 2O 3-induced apoptosis closely associated with the externalization of the ??m and the activation of Caspase 3. As 2O 3 induced cells necrosis when Caspase 3 was inhibited. CONCLUSION As 2O 3 may selectively activates Caspase 3 after it induces externalization of ??m, which causes cancer cells apoptosis.

OBJECTIVE:To observe the therapeutic effect of Acertil on stroke sequel.METHODS:The liver function,kidney function,ion,blood sugar and blood pressure of enrolled patients were examined at given time periods.RESULTS:Dis?ability degree0～1∶Acertil group14cases(49.99%),control group8cases(30.67%);Disability degree3～4∶Acertil group1case(3.5%),control group5cases(19.22%).CONCLUSION:Acertil can abate the disability degree of stroke sequel patients.

Objective　To investigate the effect of amniotic membrane on the proliferation of YAC-1 in vitro. Methods　The YAC-1 cells were cultured with amniotic membrane and their proliferation were observed by MTT automated colorimetry on the lst day， the 3rd day and the 7th day respectively.Results　Amniotic membrane could significantly enhance the proliferation of YAC-1 on the lst day, the 3rd day and the 7th day respectively after having been seeded (P＜0.01).Conclusion　Amniotic membrane can enhance the proliferation of tumor cells (YAC-1), which should be paid attention to during amniotic membrane transplantation for treating ocular surface lesion caused by epibulbar tumors. ［Rec Adv Ophthalmol 2000;20(5)∶317-318］

Objective To discuss the effect of applying evidence-based medicine (EBM) in orthopedic clinical teaching for eight-year program medical students in military medical university. Methods Totally 50 eight-year medical students in Shanghai Changzheng Hospital were equally divided into two groups:experimental group(EBM teaching group) and control group. The teacher of experimental group selected appropriate cases and set up the questions according to the difficulties encountered in clinical situation. Students retrieved the relevant medical literature and found out the most useful information for EBM system analysis. The results combined with the current cases were discussed. The teachers summarized clinical experiences and data according to the relevant depart-ment. Traditional direct infusion teaching mode was used in control group. Clinical work experiences were used to guide the students . After-department examination was conducted for both group after finishing the internship and questionnaire investigation was made among students in experiment group. Statistical analysis was carried out on the examination results with SPSS 17.0 software. Mea-surement data were expressed as x±s and comparison on mean differences between two groups was analyzed by t test. Results Average scores of subjective topic and military related topic in the theory exam were higher in experimental group than in traditional teaching group, with statistically significant differences(P<0.001). Excellent rate was 80%(20/25) in case discussion in experimental group and 60%(15/25) in control group. Experimental investigation questionnaire showed that: students got enhanced in learning initiative and broadened knowledge. 96%(24/25) students strengthened the learn-ing efficiency of military related chapters. 88%(22/25) students accepted this method and expected to continue. Conclusions Using the method of evidence-based medicine in eight-year program medical students in military medical university can cultivate the spirit of the stu-dents' self-study actively and rigorous earnest attitude. Students can grasp learning methods and sci-entific thinking. It also can strengthen students' awareness of military medicine and research.

Animals ; Disease Models, Animal ; Ischemic Preconditioning ; methods ; Lipid A ; administration & dosage ; analogs & derivatives ; MAP Kinase Signaling System ; Male ; Rats ; Rats, Wistar ; Reperfusion Injury ; metabolism

Object A systematic study on the chemical constituents of Citrus changshan huyou Y B Chang was carried out in order to reveal the active components for their further development Methods By repeated silica gel chromatographic separation and spectral analysis the structures were determined Results Six compounds of the flavonoids were obtained and identified They were hesperidin (hysperetin 7 O rutonoside) (Ⅰ); naringenin (Ⅱ); nobiletin (3′, 4′, 5, 6, 7, 8 hexamethoxyflavone) (Ⅲ); tangertin (4′, 5, 6, 7, 8 pentamethoxyflavone) (Ⅳ); 5 hydroxy 3′, 4′, 6, 7, 8 pentamethoxyflavone (Ⅴ); 5 hydroxy 3′, 4′, 6, 7, 8 haxamethoxyflavone (Ⅵ) Conclusion The above six compounds were obtained from this plant for the first time

Objective To observe clinical curative effect of the external application of Wentong Paste plus local block therapy for the treatment of stenosing tendovaginitis at radial styloid. Methods A total of 108 cases of patients with stenosing tendovaginitis at the radial styloid were randomly divided into local block therapy group, combination group and Wentong Paste group, 36 cases in each group. The local block therapy group was given injection of blocking liquid into the tendon sheath, combination group was given external application of Wentong Paste(mainly composed of Radix Angelicae Sinensis, Fructus Psoraleae, Radix Angelicae Pubescentis, and Rhizoma et Radix Notopterygii) plus local block therapy, and Wentong Paste group was only given external application of Wentong Paste. Before treatment and after treatment for one and 2 week(s), visual analogue scale (VAS) scores of pain and range of motion (ROM) of wrist joint were observed for the evaluation of clinical effectiveness and safety. The patients were followed up for 3 months for the assay of recurrence rate. Results (1) After treatment for one week, the total effective rate of local block therapy group, combination group and Wentong Paste group was 77.8%, 100.0%, 72.2%respectively, and the total effective rate after treatment for 2weeks was 86.1%, 100.0%, 86.1% respectively. The combination group had better clinical efficacy than local block therapy group and Wentong Paste group (P < 0.05). (2) After treatment for one and 2 week (s), VAS scores of the 3 groups were obviously increased while ROM was much increased (P < 0.05 compared with those before treatment). The combination group had the lowest VAS scores and highest ROM(P < 0.05).(3) No adverse reaction was found in the 3 groups during the treatment. (4) The 3 month follow-up results showed that the recurrence rate of the three groups was 30.61%, 10.20%, 20.41% respectively, and the combination group had the lower rate than local block therapy group and Wentong Paste group(P<0.05). Conclusion The external application of Wentong Paste plus local block therapy is effective for the treatment of stenosing tendovaginitis at radial styloid by relieving pain, increasing the ROM, and reducing the recurrence rate. The one-week efficacy of Wentong Paste alone was inferior to that of local block therapy alone, but their two-week efficacy showed no obvious difference. Moreover, Wentong Paste has an obvious advantage in reducing the recurrence rate.