AIM: To explore if metabotropic glutamate receptors (mGluRs) i nduces neuroprotection against 6-hydroxydopamine (6-OHDA) neurotoxicity in PC1 2 cells. METHODS: The alteration of the glutamate in extracellul ar fluid of PC12 cells was detected by high performance liquid chromatography (H PLC) with a fluorescent detector. The cytotoxic activity of PC12 cells was assay ed by means of MTT colorimetric method. RESULTS: 6-OHDA dose-d ependently increased glutamate release and decreased cell activity of PC12 cells , and the mGluRs ligands had no significant effect on that. CONCLUSION: The mGluR3 ligands has no protective effect on neurotoxicity of PC12 cel ls induced by 6-OHDA.

AIM To study the relationship between the activity of glutamate transporters and Parkinson's disease (PD), examine whether a novel ATP sensitive potassium (K ATP) channel opener Iptakalim (Ipt) hydrochloride enhances glutamate uptake activity, and to investigate its mechanisms. METHODS Rats were stereotaxically injected with 6 hydroxydopamine (6 OHDA) in SNpc. The synaptosomes from normal and PD rats were isolated, and [ 3H] glutamate uptake in synaptosomes was measured by using liquid scintillation counting. RESULTS [ 3H] glutamate uptake by synaptosomes from striatum and cerebral cortex of PD rats decreased and the redution was recovered by administration with Ipt (10, 50, 100 ?mol?L -1 ). The protective effect of Ipt was blocked by co adiministration with glibenclamide (20 ?mol?L -1 ), an inhibitor of sulphonylurea receptors. CONCLUSION Our results demonstrate for the first time the protective role of K ATP channel in glutamate uptake of synaptosomes and conceptually support the view that Ipt may have potential and feasibility in therapy for PD.

ObjectiveThis study was to evaluate the effects of different pneumoperitoneum used in laparoscopy on in vitro tumor cells growth. Methods 3H-TdR incorporation was used to compare the DNA synthesis (CPM value) of tumor cells after exposure to simulated laparoscopic environments, composed of carbon dioxide, helium and room air, respectively. Results At 24 hours after pneumoperitoneum, compared with group of helium, air and control, CPM increased in group of carbon dioxide (F=47.576 5,P0.05). At 48,72 and 96 hours, pneumoperitoneum, compared with helium group, air group and control group, CPM increased significantly in carbon dioxide group (F=116.183,1082.92 and 5116.75, P0.05). Conclusion Carbon dioxide promotes tumor cells growth, while helium restrains the growth of tumor cells. [

Object To observe the effects of coumarin (CM) and Verapamil (Ver) on contractivity and its relationship with Ca 2+ in isolated ileal smooth muscle of the rabbits. Methods The effects of CM and Ver were observed in three doses by routine experimental methods in isolated rabbit ileal. Results CM and Ver inhibited the contraction of isolated ileal smooth muscle induced by acetylcholine and CaCl 2. The responses were a concentration-dependent and non-competitive manner. CM and Ver were effective against the initial and sustained peak induced by acetylcholine. Conclusion CM has a calcium-antagonistic effect which is similar to that of Ver.

AIM:To investigate the ability of a metal complex ammonium tetrathiomolybdate (ATTM) to re-lease H2 S and its cytoprotective effect on an oxidative injury model .METHODS:Released H2 S was absorbed in a reaction flask from ATTM dissolved in the cell medium .Staining with dichlorodihydrofluorescein diacetate or rhodamine 123 fol-lowed by photofluorography was conducted for the observation of reactive oxygen species ( ROS) and mitochondrial mem-brane potential (ΔΨm) levels, respectively.Cell viability and release of lactate dehydrogenase (LDH) from the cells were measured with commercial kits.RESULTS:Similar to another H2S donor GYY4137, ATTM had an ability to release H2S in the cell medium in a dose-dependent manner .Treatment of human skin HaCaT cells with ATTM at concentrations of 25~400 μmol/L didn’ t significantly alter cell viability .Exposure of the cells to ultraviolet rays or a ROS donor H 2 O2 in-creased the intracellular ROS levels .Treatment with 400 μmol/L H2 O2 significantly reduced the viability of HaCaT cells (P<0.01).However, before the treatment with H2O2, pretreatment with ATTM at 100 and 200 μmol/L markedly pre-vented the H2O2-induced cell injury (P<0.01).In addition, the treatment with H2O2 triggeredΔΨm loss (P<0.01) and LDH release from the cells (P<0.01).Prior to suffering from H2O2 injury, the preconditioning with 200 μmol/L ATTM significantly improved ΔΨm levels ( P<0.05 ) and attenuated LDH release from the cells ( P<0.01 ) .CONCLUSION:ATTM is capable of releasing H 2 S and protecting human skin cells against oxidative injury .

OBJECTIVE: To investigate the effect of balloon kyphoplasty combined with bone cement on the treatment osteoporotic vertebral fracture.METHODS: A total of 58 aged patients with single osteoporotic vertebral compression fracture (58 vertebral bodies) were treated with balloon kyphoplasty. The fracture always occurred at T_8-L_4 segment of vertebral body in particular at T_(10)-L_2 segment of thoracic waist. By local anesthesia, lateral or bilateral pedicle of vertebral arch was punctured to injection bone cement under C-arm fluoroscopy.RESULTS: Bone cement leakage occurred in 8 cases, including leakage along posterior longitudinal ligament into adjacent posterior margin of vertebral body (n=1), external edge of vertebral body (n=6), and subcutaneous tissue (n=1); however, all the patients did not have clinical symptoms. C-arm fluoroscopy showed that height of vertebral body was increased, and rachiokyphosis was improved after treatment. Pain was obviously improved, and the easement rate of pain was 100%. There was significant difference in visual simulation score, angle degree of rachiokyphosis, and living activity scale before and 6 months after treatment (P < 0.05), but there was no significant difference between 6 months after treatment and following up stopping (P>0.05).CONCLUSION: Balloon kyphoplasty can significantly ease pain caused by osteoporotic spinal fractures and tumor metastatic spinal fractures and can partially restore vertebral body height and kyphosis deformity, there is conducive to improving spinal function and improving the quality of life.

Objective To investigate the protective effect and therapeutic window of DGMI on ischemic stroke in rats,and to explore the related mechanism.Method The rats were subjected to middle cerebral artery occlusion (MCAO) for 90 min followed by 72 h of reperfusion.DGMI (i.p.,1.25,2.5,5.0,and 10.0 mg/kg,Bid) was administered at 1 h after the onset of ischemia.Neurological score was evaluated after 24 and 72 h of reperfusion rcspectively.In fact volume,cerebral water content,oxidative stress markers,and IL-1β were evaluated after 72 h of reperfusion.The rats were treated with DGMI 5.0 mg/kg 0.5 h before reperfusion or 1 h,2 h,3 h,and 6 h after reperfusion to determined therapeutic window.Result Treatment with DGMI (2.5,5.0 mg/kg) significantly ameliorated neurological deficit,infarct volume and cerebral water content after cerebral ischemia reperfusion.DGMI also reduced the content of malonaldehyde (MDA),IL-1β,down-regulated the activities of creatine kinase (CK),lacticdehydrogenase (LDH),and up-regulated the activities of superoxide dISmutase (SOD).Treatment with DGMI 5.0 mg/kg exhibited protective effects when administered at all time points except for 6 h after reperfusion.Conclusion DGMI plays a certain protective role in ischemic stroke of rats,and the effect may be related to the improvement on the antioxidant capacity of brain tissue and the inhibition of overproduction of inflammatory cytokine.Moreover,the therapeutic window of DGMI isless than 6 h after reperfusion.

Objective To investigate the change of genomic DNA of liver and spleen tissue for different age of the elderly,and provide the experimental data for aging-related research. Methods 35 livers and 33 spleens of autopsied samples preserved in refrigerator at-80 ℃ were divided into 3 groups according to age:age 65y to 79y,age 80y to 89y,age≥90y. The content of DNA in liver and spleen was determined by ultraviolet absorbent method. Results Compaired with age 80y to 89y (0. 310 ± 0. 286)mg/mL,the content of DNA in liver was significant higher at age 65y to 79y (1.464 ±0.488)mg/mL and age ≥90y(1.147 ±0.333)mg/mL(P<0.05);Compared with age 80y to 89y(0. 938 ± 0. 589)mg/mL,the content of DNA in spleen was significant higher at age 65y to 79y(1. 723 ± 0. 726)mg/mL and age≥90y(1. 688 ± 0. 963)mg/mL(P<0. 05). The content of DNA was significant lower in liver (0. 856 ± 0. 658)mg/mL than that in spleen (1. 414 ± 0. 852)mg/mL. Conclusion The content of DNA in human liver and spleen tissue may be decrease along with aging. The content of DNA in the group at age≥90y may be increase. There were some differences between different viscera tissue in content of DNA.