AIM To investigate the analgesic effect of 1,6 Di (4 phenethyl 1 methyl 1 piperazinyl) hexane dibromide (97 9 G4) and its mechanisms. METHODS The writhing model of mice induced by acetic acid, hot plate test (sc, icv), tail flick test and the model of electrical stimulation induced contraction of guinea pig ileum were used. RESULTS The inhibition of writhing reaction induced by acetic acid was found (ID 50 =8 8 mg?kg -1 ) and the rising of mice pain threshold in hot plate test and in tail flick test was obvious ( P

Objective To analyze human operational reliability,and to provide suggestions for design of controllers in spacecraft cabin.Method Twenty-two male subjects participated in 924 person-times of experiments.The experiments were divided into 6 groups to study the effect of space suit glove,time interval and task on human operational reliability in spacecraft cabin.Result 1)Task had obvious effects on operational reliability and time(P

AIM　To synthesize piperazine derivatives and screen anti-tumor compounds with higher activity and lower toxicity. METHODS　Selecting 1,4-bis(3-bromopropionyl)piperazine as leading compound, a series of 1,4-bis［3-(amino-dithiocarboxy)propionyl］ piperazine derivatives (4a-j) were synthesized through the use of aminodithiocarboxylate. All the synthetic compounds (4a-j) were tested for their anti-tumor activity against eight kinds of tumor cells. RESULTS　Compounds (4a-j) are new compounds, among them, compounds 4c, 4d and 4e showed anti-tumor activity against HL-60. The inhibition of compounds 4c, 4d and 4e against HL-60 are 44%, 90% and 70% respectively, at the concentration of 10 μmol.L-1. However, the inhibition of the other kinds of anti-tumor cells are not distinctive. CONCLUSION　These results suggest that this may be one of the effective routes to improve the anti-tumor activity and reduce the toxicity of 1,4-bis(3-bromopropionyl)piperazine.

OBJECTIVE: To evaluate the effect of ?3 Adrenoceptor (?3-AR) antagonist SR59230A(SR) on cardiac function and expression of ?3-AR in rats with heart failure. METHODS: A total of 85 male Wistar rats were enrolled: 8 were as-signed to control group, and 77 were established into heart failure model and then 20 rats that modelled successly assigned ran-domly to placebo group or SR group, with placebo group intraperitoneally injected with normal saline and SR group with SR. The echocardiogram, hemodynamics, and expression of ?3-AR in rats after 7-week treatment were followed. RESULTS: In SR group compared with placebo group, shortening fraction, ejection fraction, left ventricular end systolic pressure, dp/dtmax and dp/dtmin were significantly higher (P

Objective:To evaluate the clinical effects of ball attachment and Locator attachment for implant-supported overdenture.Methods:67 cases with edentulous jaw were treated with 150 Straumann and Bego implants and implant-supported overdentures using ball attachments Locator attachments,respectively.All cases were followed up regularly,biological and mechanical complications were observed,the patient satisfaction after restoration was compared between groups.Statistical analysis was performed using SPSS 17.0 software.Results:Follow-up was completed in 58 cases,25 with ball attachment,26 with Locator attachment and 7 with ball changed by Locator.Biological complications comparison showed that the incidence of gingival hyperplasia in the ball group was higher than that in the Locator group(P ＜ 0.05).There was no statistical difference of mechanical complications between the 2 groups (P ＞ 0.05),but the incidence of all kinds of mechanical complications in the Locator group was less than those in the ball group,the average repair frequency of the ball and Locator group was 1.9 times and 0.9 times respectively.Patients'satisfaction on chewing and retention was higher in the Locator attachment group than that in the ball attachment group(P ＜ 0.05).No statistical difference was found in patients' satisfaction between genders (P＞0.05),and no correlation of satisfaction was found with patients' age and follow-up time.Conclusion:The clinical effects of implant-supported overdenture using the Locator attachment is superior to that using the ball attachment.

BACKGROUND: Glial cell-derived neurotrophic factor (GDNF) and transforming growth factor-beta 1 (TGF-β1)co-subordinate to TGF-β family. Both of them play very important roles in the development and differentiation of central and peripheral nervous system, and regulation of cell cycle in mammals.OBJECTIVE: To observe the differentiation of spinal cord-derived neural stem cells(NSCs) induced by GDNF combined with TGF-β1, and make a comparison of differentiation results with GDNF or TGF-β1 culture fluid.DESIGN: Controlled observation.SETTING: Central Laboratory, Shenzhen Hospital Affiliated to Southern Medical University.MATERIALS: Ten SD rats of clean grade, which were at conception for 16 days, were provided by the Experimental Animal Center, Tongji Medical College, Huazhong University of Science and Technplogy. Main reagents and materials:DMEM/F12,B27(GIBCO); basic fibroblast growth factor (bFGF), GDNF; TGF-β1(PeproTech);fetal bovine serum (FBS,Hyclone); nestin multiple antibody (Boster, Wuhan); glial fibrillary acidic protein (GFAP) multiple antibody; neurofilament protein (NF-200) monoclonal antibody (Sigma).METHODS: This experiment was carried out in the Central Laboratory, Shenzhen Hospital Affiliated to Southern Medcial University between October 2005 and September 2006. Under the aseptic condition, rat fetus was isolated for isolation and culture of spinal cord-derived neural stem cells. In this study, five groups were divided: basal medium group, control group, bFGF group, TGF-β1 group, GDNF+ TGF-β1 group. In the basal medium group, DMEM/F12 containing penicillin,streptomycin, amphotericin (AMPH) B and 0.02 volume fraction of B27 annex solution. At 1 week after primary culture, rat spinal cord-derived NSC clones proliferated in vitro stably were harvested. In the control group, 0.1 volume fraction of FBS was added into basal medium. In the later three groups, induced medium was exchanged, i.e. 20 μg/L bFGF, 2 μg/L TGF-β1, and 10 μg/L GDNF+2 μg/L TGF-β1 were added into the basal medium, respectively. ①The differentiation of spinal cord-derived NSCs induced by different factors were observed under the optical microscope. ②The expressions of neurons and astrocytes were detected by immunocytochemical staining labeling. ③ The differentiated cells were counted by sorting technique by means of fluorescence excitation flow cytometer, and the percentage of NSCs differentiating into neurons and astrocytes were detected under the different induction environments.MAIN OUTCOME MEASURES: ① Morphological feature of cell differentiation in each group. ② Immunohistochemical detection of NSCs in each group. ③ The percentage of NSCs differentiating into neurons and astrocytes in each group.RESULTS: ① Cell morphology during differentiation: At the early stage of differentiation, lots of cells creeped to all the directions, and one week later, most of the migrated cells adhered to the wall entirely. Neuron-like cells, astrocyte-like cells and oligodendrocyte-like cells could be identified in the low-density cell region. ②Immunohistochemical detection results: A lot of GFAP- positive astrocytes were found in the control group and TGF-β1 group; Many differentiated neurons and NF-200 staining positive were found in the bFGF group and GDNF+ TGF-β1 group. ③Percentage of stained neuron and astrocyte: at one week of induction, the percentage of stained neurons was higher in the GDNF+ TGF-β1 group than in the control group, bFGF group and TGF-β1 group (x2=24.15,19.56,25.32,P ＜ 0.05-0.01), and the percentage of stained astrocytes was lower in the GDNF+ TGF-β1 group than in the control group, bFGF group and TGF-β1 group (x2=24.45,23.79,P ＜ 0.01 ).CONCLUSION: The combined in vitro induction of GDNF and TGF-β1 contributes to the neuronal differentiation of spinal cord-derived NSCs, indicating that both of them have synergistic effect.

Objective To observe the clinical effect of conservative therapy on prolapse of lumbar intervertebral disc(PLID).Methods 365 PID patients included 78 acute cases and 287 subacute cases.The treating principle for acute cases was eliminating edema and aseptic inflammation,and that for subacute cases was releasing adhesion and removing inflammatory stimulation to nerve root.Results Of 78 acute patients,60 cases(76.9%) healed,18 cases(23.1%) improved;of 287 subacute patients,186 cases(64.8%) healed,101 cases(35.2%) improved,the effective rate of 365 patients was 99.7%.Conclusion Conservative therapy is effect on PLID at acute and subacute periods.

OBJECTIVETo investigate the effect of chronic treatment of enbrel (EB), a TNF-alpha antagonist, in a well defined congestive heart failure (CHF) rat model and test the hypothesis that chronic treatment of EB in CHF rats may limit the progression of Left ventricular (LV) dysfunction and structure remodeling and decrease cardiac IL-1beta levels.

METHODSWe measured cardiac conformation, contractile performance and cytokines level in 8 age-matched normal adult rats (control group) and 8 rats with isoproterenol (ISO)-induced Heart failure (ISO group) and 8 rats with ISO-induced lesion but received EB treatment (EB group).

RESULTSLV end diastolic diameter and LV end systolic diameter in EB group were significantly less and LV fractional shortening was significantly larger than ISO group (9.2 +/- 0.3 mm vs 9.5 +/- 0.2 mm, 5.8 +/- 0.5 mm vs 6.5 +/- 0.3 mm, 0.37 +/- 0.03 vs 0.31 +/- 0.02, P < 0.05, P < 0.01, P < 0.01 respectively , but there was no significant difference of LV posterior wall thickness at end diastole between the two groups; LV end systolic pressure (P(ES)) dp/dt(max) in EB group were significantly greater than ISO group (104.8 +/- 4.6 mm Hg vs 98.4 +/- 4.9 mm Hg, 8395 +/- 940 mm Hg/s vs 6898 +/- 612 mm Hg, P < 0.05 P < 0.01 respectively), and LV end diastolic pressure (P(ED)) dp/dt(min), time constant of LV relaxation were significantly lower than ISO group (3.8 +/- 0.6 mm Hg vs 7.1 +/- 0.8 mm Hg, -5963 +/- 475 mm Hg/s vs-5030 +/- 316 mm Hg/s,15.4 +/- 0.8 ms vs 21.3 +/- 1.4 ms, P < 0.01, respectively . Although cardiac contractile performance in the EB group was greatly improved, there still was a big gap when compared with the control group. The ratio of LV weight to body weight in the EB group was significantly higher than control group 2.82 +/- 0.07 mg/g vs 2.28 +/- 0.08 mg/g, P < 0.01 but there was no significant difference when compared with the ISO group. There was no significant difference between the serum level of TNF-alpha in EB group and ISO group the it could not be detected in control group. TNF-alpha levels in LV of EB group was significantly higher than control group, 757.6 +/- 46.8 pg/g vs 367.5 +/- 22.7 pg/g, P < 0.01 but there was no significant difference when compared with ISO group. The IL-1beta level in LV of EB group was significantly lower than ISO group 356.2 +/- 28.5 pg/g vs 518.4 +/- 32.5 pg/g, P < 0.05 and it could not be detected in control group. The serum level of IL-1beta could not be detected in any rats.

CONCLUSIONEB administered as soon as possible when ISO induced myocardial necrosis occurs can greatly improve cardiac contraction, and the improvement may be partly due to a decrease in the IL-1beta level in LV, besides the direct blocking effect of EB on TNF-alpha. EB can alleviate cardiac remodeling by its effect on LVEDD.

Animals ; Body Weight ; drug effects ; Echocardiography ; Etanercept ; Heart Failure ; diagnostic imaging ; drug therapy ; physiopathology ; Immunoglobulin G ; therapeutic use ; Interleukin-1 ; analysis ; Isoproterenol ; pharmacology ; Male ; Rats ; Rats, Wistar ; Receptors, Tumor Necrosis Factor ; therapeutic use ; Tumor Necrosis Factor-alpha ; analysis ; antagonists & inhibitors ; Ventricular Dysfunction, Left ; prevention & control

Objective To study the changes of hippocampal caspase-3 and PSD-95 expression levels in the mice exposed to ketamine 30 mg/(kg·d)for three months. Methods Forty C57BL/6 mice were randomly divided into two groups,and the chronic ketamine addiction model was established by giving mice a three month course of daily intraperitoneal injections of ketamine. Immunohistochemical study and Western blot-ting were applied to observe the expression of caspase-3 and PSD-95 protein. Results There were more expression of caspase-3 and less of PSD-95 in ketamine group as detected by immuohistochemistry. Western blotting results showed caspase-3 active fragment level significantly increased com-pared to saline group,but PSD-95 protein level was decreased. Conclusion The increased level of caspase-3 protein and reduced expression of PSD-95 are observed after long-term ketamine administration. These findings may provide an evidence for the neurotoxicity in mouse hippocampus of chronic ketamine addition as a recreational drug.

Objective:Autoimmune mechanisms, including cellular and humoral immune, are likely to participate in the pathogenesis of at least a subgroup of idiopathic dilated cardiomyopathy(IDC), in which cellular immune-mediated one plays a more important role. Cytotoxic T lymphocyte associated antigen-4(CTLA-4) is the major negative regulatory factor of cellular immunity. This study was conducted to investigate the association of CTLA-4 gene promoter -318C/T polymorphism, exon 1 A/G polymorphism and 3′ untranslated region microsatellite polymorphism with susceptibility to IDC in Han Chinese.Methods:Polymerase chain reaction-restriction fragment length polymorphisms(PCR-RFLP) techniques were used to analyze the polymorphisms of CTLA-4 promoter -318, exon 1 A/G and 3′ untranslated region in the unrelated Han ethnic population in Heilongjiang Province(including 72 IDC patients and 100 normal controls). Serum sCTLA-4 was tested by ELISA. The relationship of CTLA-4 genotype and alleles frequencies with sCTLA-4 was evaluated by linear regression analysis.Results:Compared with controls, the frequencies of GG genotype(0.604 2 and 0.739 6, P=0.012) and the G allele(0.360 0 and 0.560 0, P=0.008) were significantly increased in patients with IDC. Increased serum sCTLA-4 was found in the IDC group compared with the controls[(1.87?1.06)?g/L vs (0.54?0.19)?g/L, P