BACKGROUND:Currently, bioactive glass and polylactic acid have been used in clinical dentistry and plastic surgery; however, their therapeutic outcomes are not satisfactory, because the material properties have some limitations. OBJECTIVE:To explore the cytocompatibility of oxygen plasma-treated polylactic acid and bioactive glass guided bone regeneration membrane. METHODS:Bioactive glass and polylactic acid were used as the basic materials to prepare polylactic acid membrane, polylactic acid and bioactive glass composite membrane and oxygen plasme-treated polylactic acid and bioactive glass composite membrane, al of which were used to culture MG63 cels. Cel adhesion rate, cel proliferation rate and alkaline phosphatase activity of MG63 cels on these three kinds of membranes were observed. RESULTS AND CONCLUSION: With the growth of time, in these three groups of membranes, the cel adhesion rate and cel proliferation rate were al significantly increased. Alkaline phosphatase activity showed a decreasing trend after the first increase, and reached its peak at the 7thday of culture. The cel adhesion rate and cel proliferation rate in oxygen plasma-treated polylactic acid and bioactive glass group were significantly higher than those in the other two groups, while the cel adhesion and proliferation rates in polylactic acid and polylactic acid and bioactive glass groups were similar. At the 3rd day of culture, the alkaline phosphatase activity in the polylactic acid and bioactive glass group and oxygen plasma-treated polylactic acid and bioactive glass group was significantly higher than that in the polylactic acid group. At the 7th and 14th days, there was no significant difference in the alkaline phosphatase activity among these three groups. These results show that oxygen plasma-treated polylactic acid and bioactive glass composite membrane has good biocompatibility, which can better promote cel adhesion, proliferation and matrix secretion from osteogenic cels.

Objective To investigate the effects of Sangju Qingjie Decoction on the ventilator-induced lung injury in rats.Methods Thirty-six healthy male SD rats of both sexes,weighing 300-350 g,were randomly divided into 3 groups(n =12 each):control group(group C); mechanical ventilation group(group V)and Sangju Qingjie Decoction group(group SJ).The animals were anesthetized with intraperitoneal 3％ urethane 1.4 g/kg and tracheostomized.The femoral artery and vein were cannulated for blood sampling and drug administration.The animals were mechanically ventilated for 2.5 h(VT =40 ml/kg,RR 40 bpm,I:E =1:1,FiO2 21％).Ingroup SJ,Sangju Qingjie Decoction 300 g was injected into the stomach through a gastric tube once a day for 10 consecutive days,and mechanical ventilation was performed 2 h after the last injection.While in groups V and C,the equal volume of normal saline was given instead of Sangju Qingjie Decoction.Arterial blood samples were collected before ventilation,at the end of ventilation,and at 30 min after ventilation(T0-2)for blood gas analysis.Respiratory index(RI)and oxygenation index(OI)were calculated.The animals were then sacrificed and the lungs were removed for microscopic examination and determination of the content of TNF-α,IL-6 and IL-10 and W/D lung weight ratio.Results Compared with group C,RI at T1,2,the content of TNF-o,IL-6 and IL-10 and W/D ratio were significantly increased,and OI was significantly decreased at T1.2 in groups V and SJ(P ＜ 0.05).Compared with group V,RI at T1,2,the content of TNF-α and IL-6 and W/D ratio were significantly decreased,and OI at T1,2 and the content of IL-10 were significantly increased in group SJ(P ＜ 0.05).The pathological damage was attenuated in group SJ compared with group V.Conclusion Sangju Qingjie Decoction can attenuate the ventilator-induced lung injury through inhibition of inflammatory response in rats.

Objective To study the effects of exercise on blood pressure (BP) and aorta gaseous molecules of spontaneously hypertensive rats (SHR),so as to explore the role of gaseous molecules in exercise-induced changes of hypertension.Methods Sixteen male SHR were randomly divided into the SHR control (SC) group and SHR training (ST) group.Eight healthy male Wistar rats were used as normal control (WC) group.All the rats were fed normal foodstuff.The ST group was subject to 90-minute moderate swimming exercise once daily,6 times a week,for a total of 8 weeks,while the SC and WC groups were give no special intervention.The blood pressure and the contents of aorta NO,CO and H2S were examined before and at the end of the 4th,5th and 8th weeks of the exercise.Results After 8-week,a within-group comparison showed that the systolic BP (SBP) and diastolic BP (DBP) was significantly elevated in SC group as compared with the baseline BP[(198.07 ± 7.27) vs (159.91 ±6.48) mmHgin SBP,(132.75 ±11.93) vs (103.75 ±3.69) mmHg in BBP](P＜0.05),while that the BP remained without significant changes in the ST group [(164.85 ± 3.73) mmHg for SBP and (103.20 ± 7.63)mmHg for DBP] after 8-week of exercise.A between-group comparison showed that BP values measured at the end of 4th,5th and 8th weeks post-exercise in the ST group were significantly lower than those in the SC group (P ＜ 0.05).It was also shown that,at the end of 8th week post-intervention,the levels of aorta NOS,NO,HO,CO,CSE and H2 S of SC group was significantly lower than those of the WC group (P ＜ 0.05),and the levels of NOS,HO,CSE in the ST group were significantly lower than those in the WC group (P ＜ 0.05).Conclusion Moderate exercise can help relieve hypertension in SHR,and the gaseous molecules might synergistically mediate the effect of exercise in lowering the BP.

Objective To investigate the expression of brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) after cerebral infarction and treatment with curcumin combined with electroacupuncture.Methods Middle cerebral artery occlusion was successfully introduced to simulate cerebral infarction in 60 healthy,male Wistar rats.They were then randomly divided into a control group,an electroacupuncture group,a curcumin group and a curcumin combined with electroacupuncture group (the observation group),each of 15.After the modeling,the four groups were given the planned interventions for 2 weeks,with the control group receiving no intervention.All of the rats were sacrificed after neurobehavioral scoring and immunological staining of brain tissue from the infarction area was used to detect the expression of BDNF and NGF.Results The average Bederson score in the observation group was significantly lower than those of the other groups.Cells expressing BDNF and NGF were significantly more numerous in the observation group than in the other three groups.Conclusion Curcumin combined with electroacupuncture can significantly improve the expression of BDNF and NGF in the infarcted area,and this may play a neuroprotective role.

AIM: To investigate effect of atrial natriuretic peptide (ANP) on acute lung injury (ALI) induced by lipopolysaccharide (LPS) in rat. METHODS: Mean arterial blood pressure (MAP) was recorded with model 6280 physiology intelligentialize grapher, nitric oxide (NO) and endothelin (ET) concentrations in plasma were measured after lipopolysaccharide (LPS) or following LPS ,ANP was injected into vein in rats. After experiment,lung water as well as pulmonary histopathological changes was measured and observed, respectively. RESULTS: Administration of LPS elicited a persistence decrease in MAP (8.1 kPa?2.6 kPa,at 4 h,P0.05); The histopathological of lung displayed markedly improved. CONCLUSION: ANP attenuates ALI induced by LPS in the rat. The effect of ANP may be via decreasing secretion of ET,NO and regulation arterial blood pressure. [

Objective To estimate any influence of strong pulsed magnetic fields on the expression of growth-related genes in human bladder cancer BIU-87 cells. Methods Human BIU-87 cells were cultured in vitro and randomly divided into a magnetic field group and a control group. Each group was further divided into 24 h, 48 h and 72 h sub-groups. The magnetic field group cells were exposed to an 8 T magnetic field pulsed at 15 Hz for 2 h every day. The control group cells also placed on the same environment, but not exposed to any strong, pulsed magnetic field. The expression of B cell lymphoma/leukemia gene-2 (Bcl-2) mRNA, Bax mRNA and caspase-3 mRNA was measured with RT-PCR, and flow cytometry was used to evaluate the expression of the Bcl-2, Bax and caspase-3 genes of the tumor cells in vitro. Results The expression of Bax mRNA and protein was significantly higher in the cells exposed to the magnetic field than in the control groups. The expression of Bcl-2 mRNA and protein was significantly less. The expression of caspase-3 mRNA and protein in the two groups showed no significant differences.Conclusions A strong, pulsed magnetic field can inhibit the growth of bladder tumor BIU-87 cells and promote their apoptosis. The mechanism is probably related with the magnetic field promoting Bax mRNA and protein expression and inhibiting Bcl-2 mRNA and protein expression.

Objective To investigate the effects of heparanase and E-cadherin on the invasion and metastasis of gastric cancer. Methods Fifty specimens of gastric cancer which had been resected at Cancer Hospital of Liaoning Province from February 2005 to May 2007 were collected. The expression of heparanase mRNA and E-cadherin mRNA in these gastric cancer specimens was detected by RT-PCR, and the expression of E-cadherin in these gastric cancer specimens was detected by immunohistochemistry. Data were analyzed by t-test and variance analysis, and the enumeration data analyzed by chi-square test. Results There were significant differences in the expression of heparanase and E-cadherin between gastric cancer cells with high and low differentiation, presence and absence of metastasis, and TNM stages Ⅰ and Ⅱ versus Ⅲ and Ⅳ (t = 1.999, 4.258, 1.735 ; 1.286, 6.794, 3.091; χ~2 =6.273, 9.397, 5.640, P <0.05). The co-expression of heparanase (+) and E-cadherin (-) was correlated with tumor undifferentiation, lymph node metastasis and advanced TNM staging (χ~2 =11.306, 10.208, 8.420, P <0.05). Conclusions Heparanasc shows high expression while E-cadherin shows low expression in gastric cancer tissue. There is a synergistic effect between the abnormal expression of heparanase and E-cadherin, and the gastric cancer cells with coexpression of heparanase and E-cadherin have more malignant potential.

Objective To evaluate the effects of long?term glucocorticoid administration on cisatra?curium?induced neuromuscular blockade in the patients undergoing laparoscopic operation. Methods Six?ty?four patients of both sexes, aged 40-64 yr, with body mass index of 18-22 kg∕m2 , of American Society of Anesthesiologists physical status Ⅱ or Ⅲ, scheduled for elective laparoscopic operation under general anesthesia, were assigned into 4 groups ( n=16 each) according to whether or not glucocorticoid was used for a long?term period: control ( non?hormone and non?laparoscopic operation ) group ( group C ) , hor?mone + laparoscopic operation group ( group HL ) , non?hormone + laparoscopic operation group ( group NHL) and hormone +non?laparoscopic operation group ( group HNL) . Midazolam 0.03 mg∕kg was injected intravenously, 8% sevoflurane was inhaled by mask, and the concentration of sevoflurane was decreased by 2% every 30 s until the concentration of 4% was reached. After loss of eyelash reflex, remifentanil 2μg∕kg was injected intravenously over 1 min, and 30 s later sevoflurane inhalation was stopped. The patients were tracheally intubated and mechanically ventilated. Anesthesia was maintained with propofol and remifentanil given by target?controlled infusion. Neuromuscular blockade was monitored with accelerograph TOF?watch
SX. At 20 min of pneumoperitoneum in NHL and HL groups or 20 min after intubation in C and HNL groups, cisatracurium 0. 15 mg∕kg was injected intravenously. The onset time, maximal degree of N?M block, clinical duration and recovery index of cisatracurium were recorded. Results Compared with group C, the onset time was significantly prolonged, the maximal degree of N?M block was decreased, the clini?cal duration was shortened, and the recovery index was decreased in HL and HNL groups ( P<0.05) , and the clinical duration was significantly prolonged, the recovery index was increased ( P<0.05) , and no sig?nificant change was found in the onset time in group NHL ( P>0.05) . Compared with group HNL, the clin?ical duration was significantly prolonged, the recovery index was increased (P<0.05), and no significant change was found in the onset time in group HL ( P>0.05) , and the onset time was significantly shortened, the clinical duration was prolonged, and the recovery index was increased in group NHL ( P<0.05) . Com?pared with group NHL, the onset time was significantly prolonged, the maximal degree of N?M block was decreased, the clinical duration was shortened, and the recovery index was decreased in group HL ( P<0.05) . Conclusion Long?term glucocorticoid administration can weaken cisatracurium?induced neuromus?cular blockade in the patients undergoing laparoscopic operation.

Objective To investigate the effects of long-term glucocorticoid administration on neuromuscular block of cisatracurium in elderly patients undergoing general anesthesia. Methods Forty ASA Ⅱ or Ⅲ patients,aged≥65 yr,with BMI of 18-24 kg/m2 ,scheduled for elec-tive operation were studied.According to the history of using or not long-term glucocorticoid,patients were assigned into two groups (n = 20 each):control group(group C),glucocorticoid group(group J).Midazolam 0.03 mg/kg was injected,mask inhalation of 8% sevoflurane and flow rate of oxygen 8L,every 30 s decline 2%,until the 4%.After the disappearance of eyelash reflex,cisatracurium 0.1 5 mg/kg was injected intravenously.After 1 min intravenous injection of remifentanil 2 g/kg and 30 s after stop of sevoflurane inhalation anesthesia, endotracheal intubation for mechanical ventilation,target controlled infusion of propofol and remifentanil anesthesia,using TOF-Watch SX acceleromyography monitoring of muscle relaxation,and onset time,clinical duration and recovery in-dex(for T1 to return from 25% to 75% of the control twitch)were recorded.Results Compared with group C,the onset time was significantly prolonged,clinical duration and recovery index were short-ened in group J (P <0.05 ).Conclusion Long-term glucocorticoid admininstration could reduce the neuromuscular blocking effect of cisatracurium in elderly patients.

Objective To evaluate the effect of domestic wire-reinforced epidural catheter on the occurrence of adverse events during epidural block.Methods Three hundred ASA Ⅰ or Ⅱ patients of both sexes,aged 18-64 yr,weighing 41-78 kg,scheduled for elective operations under combined spinal-epidural anesthesia,were randomly divided into 3 groups (n =100 each):polyvinyl chloride epidural catheter group (group A),imported wire-reinforced epidural catheter group (group B) and domestic wire-reinforced epidural catheter group (group C).Combined spinal-epidural anesthesia was performed routinely.The corresponding epidural catheter was inserted in each group.The catheterization without difficulty,paresthesia during catheterization,the number of patients in whom blood or cerebrospinal fluid was withdrawn from the epidural catheter,intravascular catheter insertion,injection obstruction,easiness during removal of the catheter,bleeding after removal,postoperative paresthesia and epidural hematoma within 1 week after operation were recorded.Results Compared with A group,the incidences of paresthesia during catheterization,the number of patients in whom blood or cerebrospinal fluid was withdrawn from the epidural catheter,injection obstruction and postoperative paresthesia were significantly decreased (P ＜ 0.05),and no significant change was found in the other parameters in B and C groups (P ＞ 0.05).There was no significant difference in all the parameters between B group and C group (P ＞ 0.05).Conclusion Domestic wire-reinforced epidural catheter can decrease the occurrence of catheterization-induced damage to the nerve and blood vessels and the efficacy is comparable with that of imported wire-reinforced epidural catheter.