Objective To investigate the role of HO-1 in inhibition of oxygen-glucose deprivation (OGD)-induced apoptosis in rat hippocampal neurons by sevoflurane preconditioning.Methods Hippoeanlpal neurons of newborn Wistar rats (<48 h) were cultured in vitro.Tne neurons were randomly divided into 6 groups with 108 wells in each group:control group(group C),2% sevoflurane preconditioning group (group S1),OGD group,S1 +OGD group,4% sevoflurane preconditioning+OGD group (group S2+OGD),and 4% sevoflurane preconditioning+ZnPPⅨ+OGD group(group Z).Group C received no treatment.The neurons were cultured for 24 h after 2% sevoflurane preconditioning in group S1.For OGD experiments,the neurons were placed in deoxygenated glucose-free medium and sealed under 95% N2-5% CO2 in an anaerobic chamber equilibrated to 37℃ and 100%humidity for 45 min.then OGD was terminated by replacement of the stored medium and returning the cultures to a standard incubator maintained at 37℃ in 5% C02 and the neurons were cultured for 24 h as described by Ray et al. The OGD model was established after 2% and 4% sevoflurane preconditioning in group S1 + OGD and S2 + OGD respectively. In group Z, when the neurons were preconditioned with 4% sevoflurane, ZnPPⅨ was added to the culture medium at the same time, and the other procedures were the same as those in group S2 + OGD. The neuron viability, apoptesis rate, and expression of HO-I protein and mRNA were detected at 24 h of culture. Results Compared with group C, neuron viability was significantly decreased,apoptosis rate was significantly increased, and expression of HO-1 protein and mRNA was up-regulated in group OGD, S1 + OGD, S2 + OGD and Z, expression of HO-1 protein and mRNA was up-regulated in group S1 ( P < 0.01 ), but no significant change was found in neuron viability and apoptosis rate in group S1 ( P > 0.05). Compared with group OGD, neuron viability was significantly increased, apoptosis rate was significantly decreased, and expression of HO-1 protein and mRNA was up-regulated in group S1 + OGD and S2 + OGD ( P < 0.01), but no significant change was found in the indexes mentioned above in group Z ( P > 0.05 ). Neuron viability was significantly higher, apoptosis rate lower and expression of HO-1 protein and mRNA higher in group S2 + OGD than in group S1 + OGD ( P < 0.01). Neuron viability was significantly lower, apoptosis rate higher and expression of HO-1 protein and mRNA lower in group Z than in group S2+OGD(P<0.01).Conclusion HO-1 is involved in the inhibition of OGD-indueed apoptosis in rat hippocampal neurons by sevoflurane preconditioning.

Field operations,work and war on plateau is an important part of future war. It is necessary to study the early treatment and evacuation of scull injury. Research and survey were made in 7 field hospitals and hundreds of records were summaried before treatment criterion in early phase was put forward for patients on plateau as well as the evacuation in different level and stage,which aims to actively save patients' lives within limited time and reduce the death rate and prevent deformity. References are provided for war,training,and construction in battlefield.

Objective To study the radiosensitivity enhancement effects of recombinant adenovirus mediated retinoblastoma 94 gene on the growth of esophageal carcinoma cells EC109.Methods EC109cells was transfected with recombinant Rb94 gene adenovirus and irradiated by 137Cs γ-rays.The cohorts were divided into groups as blank control,Ad-LacZ,Ad-Rb94,radiation and Ad-Rb94 combined with radiation.Cell inhibition ratio,cell cycle and expression of retinoblastoma protein of EC109 cells were analyzed.Results The growth of EC109 cells transfected with Ad-Rb94,radiation and Ad-Rb94 combined with radiation group was all inhibited.The group of Ad-Rb94 combined with radiation resulted in greater inhibition of cells growth compared with Ad-Rb94 group and radiation group ( F =23.31,P ＜0.05 ).Cells of G2 phases of EC109 cancinoma cells for Ad-Rb94 combined with radiation group were the highest,which was 50％.The combination of Ad-Rb94 and radiation group resulted in the greatest expression of retinoblastoma protein,which reached 71％,significantly higher than Ad-Rb94 infection and radiation groups ( x2 =8.31,6.73,P ＜ 0.05 ).Conclusions Retinoblastoma 94 gene combined with ionizing radiation can enhance the radiation sensitivity of EC109 cells.

Adult ; Cosmetics ; adverse effects ; chemistry ; Female ; Humans ; Hypothyroidism ; chemically induced ; Mercuric Chloride ; adverse effects ; analysis ; Mercury ; adverse effects ; analysis

OBJECTIVETo investigate the protective effects of adiponectin on myocardial ischemia-reperfusion injury and the potential mechanisms in rats.

METHODSThirty-two male rats aged 8 weeks were randomly assigned to sham operation (sham), myocardial ischemia-reperfusion (MIR), diltiazem treatment (diltiazem) or adiponectin administration (APN) groups (n = 8 each). MIR rats underwent left anterior descending artery (LAD) occlusion for 30 min followed by 60 min reperfusion. Diltiazem (7 microg/g) and APN (120 ng/g) were given by caudal intravenous injection at the end of 30 min ischemia and the beginning of reperfusion for rats in diltiazem or APN groups. Animals were sacrificed after 60 min reperfusion for determining the myocardial nitric oxide (NO), Caspase 3, activity of AMP-activated protein kinase(AMPK) and concentration of peroxisome proliferators-activated receptor gamma (PPARgamma). Apoptotic cells were stained by Caspase 3 Activity Assay Kit and mitochondria in myocardial cells were observed by transmission electron microscope (TEM).

RESULTSThe myocardial Caspase 3 level was significantly increased [(168.50 +/- 30.08) micromol/L vs. (53.25 +/- 11.41) micromol/L, P < 0.01], AMPK activity, PPARgamma and NO concentrations were significantly reduced in MIR group compared with those in sham group (all P < 0.05) [(0.74 +/- 0.59) IU/ml vs. (25.63 +/- 4.61) IU/ml, P < 0.01; 0.1894 vs. 0.7949, P < 0.01; (6.359 +/- 1.355) micromol/L vs. (10.396 +/- 1.901) micromol/L, P < 0.01], these effects could be significantly reversed by APN. In comparison with MIR group, the levels of Caspase 3 in cardiac muscles were significantly lowered in Adiponectin group [(88.75 +/- 6.92) micromol/L vs. (168.50 +/- 30.08) micromol/L, P < 0.01], whereas the level of AMPK and PPARgamma, NO concentration in the cardiac muscle was remarkably increased [(27.22 +/- 4.76) IU/ml vs. (0.74 +/- 0.59) IU/ml, P < 0.01; 0.8613 vs. 0.1894, P < 0.01; (15.755 +/- 1.045) micromol/L vs. (6.359 +/- 1.355) micromol/L, P < 0.01]. APN also preserved the function and structure of mitochondria in rats post ischemia/reperfusion injury. The protective pharmacologic actions of APN were superior to that of diltiazem.

CONCLUSIONAdiponectin could protect myocardial tissues from myocardial ischemia-reperfusion injury in rats, possibly by upregulating myocardial AMPK and PPARgamma expressions and preventing myocardial cells from apoptosis.

AMP-Activated Protein Kinases ; metabolism ; Adiponectin ; pharmacology ; Animals ; Apoptosis ; drug effects ; Caspase 3 ; metabolism ; Diltiazem ; pharmacology ; Male ; Myocardial Reperfusion Injury ; metabolism ; prevention & control ; Myocardium ; metabolism ; Nitric Oxide ; metabolism ; PPAR gamma ; metabolism ; Rats ; Rats, Sprague-Dawley

BACKGROUNDWe investigated the impact of eliminating the impingement between extensor mechanism and tibial insert on patellar tracking and patellar ligament tension in high knee flexion.

METHODSSix cadaveric specimens were tested on an Oxford-type testing rig. The Genesis II knee system was implanted into each specimen knee with the traditional tibial insert and high-flex insert successively. Compared to traditional insert, the high-flex insert was characterized with a chambered anterior post and a chambered anterior lip which eliminates patella-post and patellar ligament-anterior lip impingements. The patella was tracked with an NDI Optotrak Certus system. The patellar ligament tension was measured using a NKB S-type tension transducer.

RESULTSThere was a decrease of resultant patellar translation relative to the femur with statistically significant (P<0.05) at 90 degrees to 150 degrees of knee flexion and a decrease of patellar ligament tension with statistical significance (P<0.05) at 100 degrees, 120 degrees, 130 degrees, and 140 degrees of flexion using high-flex insert compared to traditional insert.

CONCLUSIONSEliminating the impingement between extensor mechanism and implant in high knee flexion altered patellar tracking and reduced patellar ligament tension, which would facilitate high knee flexion.

Biomechanical Phenomena ; Humans ; In Vitro Techniques ; Knee Joint ; physiology ; Ligaments, Articular ; physiology ; Patellar Ligament ; physiology ; Range of Motion, Articular ; physiology

OBJECTIVETo clone and express a homologue of human macrophage migration inhibitory factor (MIF) from P. falciparum 3D7--PfMIF.

METHODSThe nucleotide sequence of PfMIF was found through blast P. falciparum genomic sequence databases with the amino acid sequence of human MIF (HuMIF). RT-PCR, DNA sequencing, and bioinformatics analysis were used for the cloning of Pfmif gene. The recombinant protein was expressed in E. coli and purified through the affinity column.

RESULTSThe full length of Pfmif gene was cloned and sequenced. It was composed of 351 nucleotides and encoded 116 amino acids with the typical characteristic of MIF family. The recombinant protein was successfully expressed and purified.

CONCLUSIONSThe Pfmif gene and recombinant protein were successfully isolated and PfMIF was preliminarily identified as a novel member of MIF family.

Amino Acid Sequence ; Animals ; Base Sequence ; Cloning, Molecular ; Escherichia coli ; genetics ; Humans ; Macrophage Migration-Inhibitory Factors ; biosynthesis ; genetics ; isolation & purification ; Molecular Sequence Data ; Plasmodium falciparum ; genetics ; metabolism ; Protozoan Proteins ; biosynthesis ; genetics ; isolation & purification ; Recombinant Proteins ; biosynthesis ; genetics ; Sequence Homology, Amino Acid

Objective To detect the expression of matrix metallproteinases(MMPs) in aortic valve of children who suffered from rheumatic heart disease(RHD) and to explore the pathological role of MMPs in children′s rheumatic aortic valve disease.Methods RHD group composed of 18 aortic valves from children suffered from RHD.Controls were 8 children who were died accidentally without cardiovascular system diseases.Hematoxylin and eosin stain observing the histological characteristic of the 2 groups.Immunohistochemistry was used to detect expression of MMP2 and MMP9 on aortic valves in 2 groups.Results Hematoxylin and eosin stain showed:in RHD the valves′ structure were destroyed along with fibrous tissue proliferation,mucinous degeneration,collagen and fiber hyalinization,blood vessel and blood capillary proliferation,lymphocyte,plasmocyte,monocyte infiltration.Immunohistochemistry showed that MMP2 and MMP9 expression were significantly higher than those in the aortic of RHD(68.85?13.08,64.35?9.59) compared with control group(107.31?23.39,116.28?6.99)(t=3.92,10.18 all P

OBJECTIVETo compare the effect of high frequency oscillatory ventilation (HFOV) and conventional mandatory ventilation (CMV) on the myocardial function of rabbits with inhalation injury.

METHODSSteam inhalation injury model was reproduced in 16 New Zealand albino rabbits. They were randomly divided into CMV group (n = 8) and HFOV group (n = 8) by drawing lots, and they received ventilation in metered volume and HFOV treatment respectively. Heart blood was drawn from rabbits before they were sacrificed 4 hours after treatment to determine the plasma activity of lactate dehydrogenase 1 (LDH1) and creatine phosphorylated kinase (CPK-MB). Myocardial tissue from left ventricle was harvested and homogenized to determine the concentration of TNF-α and IL-8, the activity of caspase-1, and the activity of myosin-light-chain kinase (MLCK) and the ATPase of myosin light chain (MLC-ATPase) by enzyme-linked immunosorbent assay, spectrophotometry, and the nuclide liquid scintillation technique respectively. Part of the myocardial tissue sample was examined pathologically. Data were processed with analysis of variance.

RESULTS(1) The activities of LDH1 and CPK-MB in plasma were obviously higher in CMV group than in HFOV group [(643 ± 108), (342 ± 48) U vs. (233 ± 92), (186 ± 36) U, with F value respectively 10.326 and 9.846, P values all below 0.01]. (2) The contents of TNF-α, IL-8 and the activity of caspase-1 in myocardial tissue homogenate were obviously higher in CMV group than in HFOV group [(181 ± 35), (89 ± 19) pg/g, and (0.56 ± 0.27) g/g protein vs. (94 ± 21), (43 ± 11) pg/g, and (0.24 ± 0.12) g/g protein, with F value respectively 8.239, 7.826, 5.716, P values all below 0.01]. (3) The activities of MLC-ATPase and MLCK were lower in CMV group than in HFOV group [(0.24 ± 0.12) µmol×mg(-1)×min(-1), (3.3 ± 1.1) mmol×mg(-1)×min(-1) vs. (0.48 ± 0.16) µmol×mg(-1)×min(-1), (7.7 ± 1.7) mmol×mg(-1)×min(-1), with F value respectively 4.125, 4.766, P values all below 0.01]. (4) No obvious necrosis, degeneration or inflammatory cell infiltration was observed in myocardial tissue of rabbits in 2 groups under light microscope; but the myocardial fiber was slightly swollen, and it was less marked in the HFOV group.

CONCLUSIONSThe influence of HFOV on myocardial myosin phosphorylation system of rabbits with inhalation injury is less than that of CMV.

Animals ; Burns, Inhalation ; metabolism ; physiopathology ; therapy ; High-Frequency Ventilation ; Myocardium ; metabolism ; Myosin-Light-Chain Kinase ; metabolism ; Rabbits ; Respiration, Artificial

OBJECTIVETo investigate the effects of high frequency oscillatory ventilation (HFOV) and its combination with administration of pulmonary surfactant (PS) on inflammatory response of lung tissue in rabbits with inhalation injury.

METHODSSevere steam inhalation injury models were reproduced in 24 New Zealand albino rabbits. They were divided into control group (n = 8), HFOV group (n = 8), and HFOV + PS group (n = 8) according to the random number table, and they received ventilation in metered volume, HFOV, and HFOV + PS treatment respectively. Lung tissue samples of rabbits were collected at 3.5 h after treatment for pathological inspection and pulmonary injury score, assay of the activity of myeloperoxidase (MPO) and cysteinyl aspartate-specific protease 1 (caspase-1), and the determination of the contents of TNF-alpha, IL-18, IL-10, IL-13 and their mRNA expression.

RESULTSPathological change in different degree of rabbit lung tissue in each group were observed, and they were most obvious in the control group, and least in the HFOV + PS group. The lung tissue injury scores of control group, HFOV group, and HFOV + PS group was 3.71 +/- 0.43, 2.87 +/- 0.26, and 2.08 +/- 0.28 respectively. The difference between either two of them were statistically significant (P < 0.01). The MPO content and caspase-1 activity of rabbits in HFOV and HFOV + PS groups were obviously lower than those in control group (P < 0.01), and MPO content and caspase-1 activity of rabbits in HFOV + PS group were obviously lower than those in HFOV group (P < 0.05). In HFOV group and HFOV + PS group, the contents of TNF-alpha, IL-18 and their mRNA expression in lung tissue homogenates were obviously lower than those in control group (P < 0.01); while the contents of IL-10, IL-13 and their mRNA expression were obviously higher than those in control group (P < 0.01). Changes in these contents and expression in HFOV + PS group were more obvious than those in HFOV group (P < 0.05).

CONCLUSIONSHFOV can alleviate inflammatory response in rabbit lung tissue and pulmonary injury induced by inhalation injury, and the effect is more obvious when combined with PS.

Animals ; Burns, Inhalation ; complications ; therapy ; Disease Models, Animal ; High-Frequency Ventilation ; Inflammation ; Lung Injury ; etiology ; therapy ; Pulmonary Surfactants ; therapeutic use ; Rabbits