Objective To study any change in the expression of γ-glutamylcysteine synthetase (γ-GCS) in the skeletal muscles of mice with emphysema.MethodsTwenty Kunming male mice were divided into a normal control group and an emphysema group (n =10 in each ).An emphysema model was established by passive cigarette smoking in 8 of the emphysema group mice.TUNEL staining was used to detect apoptotic skeletal muscle cells.Im munohistochemical assays were used to determine the protein level of γ-GCS synthetase.ResultsThe average optical density of apoptotic cells was significantly higher in the skeletal muscles of the mice with emphysema compared with the normal controls,and their average γ-GCS synthetase levels were also significantly higher.Conclusions Apoptotic cells increase in skeletal muscle during emphysema,which may be caused by an oxidation/antioxidant imbalance mediated by γ-GCS synthetase.

Objective To develop a model of inflammatory bowel disease in rats induced by 2,4,6-trinitrobenzenesulfonic acid(TNBS).Methods Fifty Wistar rats were randomly divided into three groups:model,mock model and normal group.2% TNBS,50% ethanol and physiological saline were administered per-rectum to each of the three groups,respectively.Feces,psychosis and appetite were observed,body weight and food eaten were recorded daily.Rats were killed after 3,6 and 14 d,and the colons were isolated and histological findings were examined.Results On the first day,rats in the model group had loose and bloody stools,and the symptoms lasted for about 8 days.Body weight and food eaten were markedly decreased for 7-10 days.Obvious pathological changes in the colon were observed on third day and heavier on sixth day,characterized by mucosal necrosis and transmutable inflammation.In the mock model group,the rats had loose stools on first day,and recovered on second day.Light pathological changes were found on third day.In the normal group,no pathological changes were found in colon.Conclusion Rats treated with TNBS showed obvious characters of inflammatory bowel disease,which could be used as a model in study on etiopathogenesis and evaluation effects of medicines.

Objective To investigate the effectiveness of cis-diamminedichloroplatinum (DDP) combined with hyperthennia in killing liver tumor cells and its influence on erythrocytes in vitro. Methods Cultured liver tumor cells (2 ml) were mixed with erythrocyte suspension (10 ml) and then the mixture was separated into 6 centrifuge tubes with 2 ml in each one. The centrifuge tubes were randomly divided into A-F groups and the experiment was repeated for 30 times. Normal saline 2 ml was added in A and D groups. DDP 2 ml (200 μg/ml) was added in B and E groups. DDP 2 ml (400 μg/ml) was added in C and F groups. The cells were then incubated in warm bath of 37 ℃ for 30 min in A, B and C groups and in warm bath of 42 ℃ for 30 min in the other three groups.After hyperthermic treatment, tumor cells were isolated from erythrocytes using density gradient centrifugation, the inhibition rate of tumor cells was determined by MTT method and the clone formation of tumor cells was checked.The erythrocyte osmotic fragility and content of 2,3-diphosphoglyceric acid in erythrocytes were measured. Results The inhibition rate of tumor cells was gradually increased, while the rate of tumor cell clone formation decreased with the increase in the temperature and DDP concentrations ( P < 0.01) . The rate of tumor cell clone formation was more than 98% and no clone formation was tested in group F. There was no significant difference in the content of 2,3-diphosphoglyceric acid in erythrocytes between before and after hyperthermic treatment in group F ( P >0.05 ) . The rate of hemolysis of erythrocytes was less than 1 % in the 0.68 % sodium chloride solution in group F.Conclusion DDP 200 μg/ml combined with hyperthermic treatment with temperature of 42 ℃ for 30 min can make the liver tumor cells lose the capability of proliferation, however, it exerts slight effect on erythrocyte membrane and no influence on the oxygen-carrying capacity of erythrocytes.

Objective To investigate the effects of intrathecal (IT) ketamine on the synapsis remodeling in the spinal dorsal horn during devolopment of morphine tolerance in a rat model of neuropathic pain (NP). Methods Male SD rats weighing 200-250 g were used in this study. IT catheter was placed in the subarachnoid space according to Yaksh. Forty-eight SD rats in which IT catheter was successfully placed were randomly divided into 6groups (n=8 each): group sham operation (group S); group NP; group normal saline 20 μl IT(group NS);group morphine 20 μg IT (group M); group ketamine 50 μg IT (group K) and group morphine 20 μ g + ketamine 50 μg IT (group MK). NP was induced by compression of right L4,5 dorsal root ganglions with steel wire inserted through L4,5 intervertebral foramen in NP,M,K and MK groups. Normal saline or morphine and/or ketamine were injected IT once a day for consecutive 14 days. Paw withdrawal threshold (PWT) to mechanical stimulation and paw withdrawal latency (PWL) to a thermal nociceptive stimulus were measured on 0, 1, 3, 5, 7, 9, 11, 14 days during the consecutive 14 days of administration. The animals were sacrificed after the final IT administration. The lumbar segment of the spinal cord was removed for determination of the number of synapsis in the spinal dorsal horn by immuno-histochemistry in 4 animals in each group and observation of synaptic structure remodeling using electron microscope in another 4 animals in each group. Results Compared with group S, PWT was significantly decreased and PWL was shortened in the other 5 groups, and the number of synapsis was significantly increased and the synaptic structure was thickened in NP, NS, M and K groups (P ＜ 0.05). Compared with group NP,PWT was significantly increased and PWL was prolonged in M, K and MK groups, and the number of synapsis was significantly decreased and the thickness of synaptic structure was significantly reduced in group MK ( P ＜ 0.05).Compared with group M, PWT was significantly increased, PWL was prolonged, the number of synapsis was significantly decreased and the thickness of synaptic structure was significantly reduced in group MK ( P ＜ 0.05). Conclusion IT ketamine can inhibit the synaptic remodeling in the spinal dorsal horn during development of morphine tolerance in a rat model of NP.

BACKGROUND:Intervertebral disc degeneration is the pathological basis of degenerative spinal diseases. Studies on the influentialfactors of intervertebral disc degeneration contribute to the prevention and treatment of degenerative spinal disease.
OBJECTIVE:To observe the growth and proliferation of nucleus pulposus cels isolated by trypsin plus type II colagenase digestion in complete medium with different glucose concentrations, exploring the optimal glucose concentration for growth of nucleus pulposus cels.
METHODS:Nucleus pulposus cels isolated and cultured by trypsin plus type II colagenase digestion method were observed under an inverted microscope, and thecelnumber was counted. Morphology of nucleus pulposus cels was observed afterhematoxylin-eosinstaining and toluidine blue staining. Colagen type II immunoreactivity was detected by immunohistochemical staining combined with immunofluorescent staining.Nucleus pulposuscels were incubated in complete medium containing various glucose concentrations (0, 6.25, 12.5, 17.5, and 25 mmol/L) for 24 hours, and then cel proliferation and apoptosis were determined.
RESULTS AND CONCLUSION:The stained nucleus pulposus cels showed polygonal and short spindle, with one or two nuclei. Celularpseudopod appeared gradualy and then became slim with increased passage numbers. The isolated and cultured nucleus pulposus cels positively expressed colagen type II and aggrecanProliferative activity of nucleus pulposus cels cultured in medium with 17.5 mmol/L glucose was significantly higher than that in medium with 0 and 25 mmol/L glucose (P< 0.05 orP< 0.01). There wasno significant differencein cel apoptosis between these groups except for 0 mmol/L glucose (P<0.05). These results confirm that a large number of nucleus pulposus celscan beharvested by trypsin plustype II colagenase digestion and the optimal glucose concentration is 17.5 mmol/L.

Objective To explore the clinical curative effects of hip replacement in the treatment of femoral neck fracture and femoral head necrosis in elderly patients and the existing problems.Methods A total of seventy-five aged patients with femoral neck fracture or femoral head necrosis who were treated by hip replacement were selected as study objects.They were divided into fracture group and femoral head necrosis group according to disease type,all the patients were treated with hip replacement.The surgical time,intraoperative blood transfusion volume,length of hospital stay,in-bed time,perioperative complications and postoperative complications were observed and recorded.The Harris score was used to evaluate hip function of preoperation and postoperation.Results All patients were followed up for 6 ～ 24 months,no incision infection and severe perioperative complications.The volume of intraoperative blood loss,operation time,hospitalization time,in-bed time of the fracture group were (334.9 ± 90.4) mL,(91.7 ± 14.3) min,(19.5 ± 7.5) d,(5.9 ± 1.6) d,respectvely,which of the femoral head necrosis group were (362.9 ± 71.5) mL,(93.5 ± 7.8) min,(20.5 ± 4.2) d,(6.3 ± 1.4) d,respectvely,the differences between the two groups were not statistically significant (all P ＞ 0.05).At the end of the follow-up,the Harris scores of the two groups were higher than before operation,and the score of the fracture group (89.0 ± 7.4) points was significantly higher than (84.0 ± 9.2) points of the femoral head necrosis group (t =19.639,P ＜ 0.05).In the fracture group,1 year after surgery,1 patient appeared delayed fracture healing,2 cases with postoperative pain when walking the affected area.In the femoral head necrosis group,1 case with femoral nerve injury,1 case of death due to its original diseases,1 case of postoperative sore pain when walking,the two groups had no prosthesis loosening or dislocation phenomenon.Conclusion Hip replacement in the treatment of femoral neck fracture and femoral head necrosis in elderly patients can be used as a clinical treatment option with short in-bed time,less intraoperative blood loss,short operation time,less perioperative complication and good treatment effect,and it is worth to be promoted.

Objective To discuss the clinical effect of pulmicort respules inhalation in children with acute infectious laryngitis.Methods We selected acute infectious laryngitis in our hospital from November 2015 to November 2016,106 children were divided into two groups,the control group and the observation group of 53 cases,of which the control group of children with conventional treatment,the observation group to take Pulmicort respules inhalation treatment,the two comparison(P<0.05).The total effective rate of the observation group and the control group were 100％and 90.56％respectively(P<0.05).Results The treatment effect of the observation group and the control group were observed and compared(P<0.05),and the improvement of the observation group after treatment and the time of symptom extinction were significantly better than that of the control group(P<0.05); The clinical symptoms of both groups before and after treatment were improved(P<0.05).Conclusion The treatment of children with acute infectious laryngitis by atomizing inhalation of pulmicort respules can obtain obvious therapeutic effect and reduce the adverse reaction caused by improper use of drugs,(fever,cough,wheezing,etc.)have a good improvement in clinical application worthy of recognition.

Bone Conduction ; Hearing Aids ; Humans

Objective To detect the spatial point pattern distribution rules of neural tube defects.Methods The kernel density estimation and Ripley's K-function were used to analyze the spatial point pattern of the neural tube birth defects in Heshun county in 1998-2001.Results The kernel density estimation result showed that there was two clusters' distribution in central area and southeastern area respectively.In addition,the result by the Ripley's K-function presented that the location of neural tube birth defects had a significant cluster tendency in the spatial distance from 3.17 to 10.41 kilometers in the investigated area.Conclusion These results can provide an important clue for identifying the relations between environment risk factors and birth defects in this area in the future.

Objective To acquire effective clues for identification of environmental risk factors to birth defects. Methods Spatial autocorrelation statistics Moran's I and spatial hotspots detect method Getis's G statistics was used to identify birth defect risk factor. Results The different kinds of birth defects have different spatial distribution. Neural tube birth defects have the properties of spatial autocorrelation and different clustering phenomena in different spatial scales. Two typical spatial patterns were discovered in spatial scales of about 6.84 kilometers and 22.8 kilometers. Conclusion Using spatial autocorrelation probing technique, we find that there may be some common environmental teratogenetic factors which affect birth defects occurring ratio in the study area. By hotspots analysis of the clustering phenomena, the risk factors leading to birth defect were further resolved.