Objective: To study the effects of mechanical strain on the proliferation of human osteoblasts. Methods: Cloned MG 63 human osteoblasts were cultured and seeded at 10 5/well in 6 well Bioflex cell cuture plates. Subsequently, the cells were exposed to mechanical strain stimulation (at 6%, 12% and 24% elongation rate respectively) for 24 hours using Flexercell 3000 Cell Stretching Unit. MTT colorimetric method was used to assess the proliferation of the cells. Results: The proliferation of MG 63 cells was significantly increased 24 h after mechanical strain treatment( P

objective: To observe the changes in the bilateral condyles after unilateral mandibular lengthening with distraction osteogenesis. Methods: Unilateral mandibular osteodistraction (DO) was performed in 8 goats. 4 animals were sacrificed at 8 and 16 weeks after completion of distraction respectively. The TMJ specimens were harvested and processed for histologic, histomorphometric and scanning electron microscopic (SEM) examinations. Results: Reversible adaptive remodeling in the condyles was observed following mandibular distraction at a rate of 1 mm/d. No degenerative changes in the TMJs were found after mandibular lengthening. Conclusion: Gradual distraction at a rate of 1 mm/day may not lead to degenerative change in condylar cartilage.

Objective To study the effect of continuous drainage of subglottic secretion on ventilator associated pneumonia (VAP).Method One hundred and thirty two patients undergoing continuous drainage of subglottic secretion were divided into the control group(n=70)and the experiment group(n=62):the former group underwent sputum suction in case of bucking,wheezy phlegm or decreased oxygen saturation and the latter continuous drainage of subglottic secretion.The incidence of VAP was compared between the two groups.Result The incidences of VAP in the experiment and control groups were 17.7%and 32.9%,respectively, with significant difference between the groups(χ2=3.928,P﹤0.05).Conclusion The continuous drainage of subglottic secretion can effectively reduce the incidence of VAP.

BACKGROUND:In vitro and in vivo studies of cel response to a variety of mechanical loadings have demonstrated the stimulation of bone formation by loads. However, the effects of different mechanical strains on the same cel s have never been adequately studied by far.
OBJECTIVE:To investigate the effects of different mechanical strains on rat bone marrow mesenchymal stem cel s.
METHODS:Rat bone marrow mesenchymal stem cel s were isolated and cultured in vitro. Bone marrow mesenchymal stem cel s were subjected to different stimulations including dynamic stretch, static stretch and hybrid stretch through the use of custom-made mechanical stretch device. Cel ular proliferation, alkaline phosphatase activity and mRNA expression of Runx2 of bone marrow mesenchymal stem cel s were detected and the secretion of osteocalcin was evaluated under three different stretch modes respectively.
RESULTS AND CONCLUSION:Compared to the control group, cel proliferation increased by 18.67%, however, alkaline phosphatase activity, Runx2 expression and osteocalcin secretion were not changed obviously in the static stretchgroup. Compared to the control group, alkaline phosphatase activity, Runx2 expression and osteocalcin secretion increased by 60.33%, 49.67%and 48%respectively;however, cel proliferation was inhibited, in the dynamic stretch group. Compared to the control group, cel proliferation was slightly, but not significantly, increased in the hybrid stretch group, and the alkaline phosphatase activity, Runx2 expression and osteocalcin secretion increased although the increases were not as apparent as those in the dynamic stretch group. These findings suggest that static mechanical strain can significantly promote cel proliferation, the dynamic mechanical strain more greatly promotes osteogenic differentiation of bone marrow mesenchymal stem cel s, and the hybrid mechanical strain promotes the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cel s.

Estrogen participates in many life activities through combination with estrogen receptor alpha (ERalpha) or estrogen receptor beta (ERbeta) in the body. In order to establish an in vitro estrogen-like compound screening model, the coding region of human ERalpha and ERbeta was separately constructed into pET32-ERalpha and pET43-ERbeta prokaryotic expression vector and water-soluble recombinant ERalpha and ERbeta proteins were expressed in Escherichia coli strain BL21. Western blotting revealed that both recombinant proteins have estrogen receptor binding sites. The proteins were purified using S-Tag affinity Purification Kit and digested with enterokinase to get the ERalpha and ERbeta proteins. About 0.90 mg of ERalpha and 0.65 mg of ERbeta were obtained at the concentration of 0.181 and 0.131 mg x mL(-1), respectively.

Danshen (Salvia miltiorrhiza Bunge) hairy roots were obtained by infecting Danshen leaves with Agrobacterium rhizogenes 9402. Besides rosmarinic acid (RA) and salvianolic acid B (SAB), the hairy root could also produce salvianolic acid K (SAK), salvianolic acid L, ethyl salvianolic acid B (ESAB), methyl salvianolic acid B (MSAB), and a compound with a molecular weight of 538 (compound 538) identified by using LC-MS. Effects of methyl jasmonate (MeJA) and yeast elicitor (YE) on the accumulation of these compounds had been investigated. MeJA increased the accumulation of SAB, RA, SAK, and compound 538 from 4.21%, 2.48%, 0.29%, and 0.01% of dry weight to 7.11%, 3.38%, 0.68%, and 0.04%, respectively. YE stimulated the biosynthesis of RA from 2.83% to 5.71%, but depressed the synthesis of SAB, SAK and compound 538. It was indicated in all the results that these Danshen hairy roots could be used as alternative resources to produce salvianolic acids. Analysis of the content variation of these compounds after elicitation suggested that SAK and compound 538 might be the intermediates in the biosynthesis from RA to SAB in Danshen hairy roots.

Objective To evaluate the effect of intrathecal resveratrol on activation of Ca2+/ calmodulin-dependent protein kinase Ⅱ (CaMK Ⅱ) in spinal dorsal horn neurons of rats with bone cancer pain.Methods Thirty-two adult female Sprague-Dawley rats,weighing 180-220 g,were equally randomized into 4 groups using a random number table:sham operation group (group S),bone cancer pain group (B group),and bone cancer pain + solvent control group (BD group).Walker 256 mammary gland cancer cell suspension (4× 105 cells/ml) 5 μl was injected into the medullary cavity of the right tibia in B,BR and BD groups.Normal saline 5 μl was given in group S.On 12,13 and 14 days after injection of mammary gland cancer cells,resveratrol 200 μg/10 μl was injected intrathecally once a day in group BR,and 1％ dimethyl sulfoxide 10 μl was intrathecally injected once a day in group BD.Before injection of mammary gland cancer cells (T0) and on 3,5,7,10,12 and 14 days after injection of mammary gland cancer cells (T1-6),mechanical paw withdrawal threshold (MWT) and thermal paw withdrawal latency (TWL) were measured.The rats were then sacrificed and L4,5 segments of the spinal cord were removed for confirmation of the location of phosphorylated CaMK Ⅱ (p-CaMK Ⅱ) in spinal dorsal horn neurons (by immunofluorescence) and for detection of p-CaMK lⅡ expression (using Western blot).Results Compared with group S,MWT and TWL were significantly decreased at T2-6,and p-CaMK Ⅱ expression was upregulated at T6,and p-CaMK Ⅱ was mainly co-expressed with neurons in B,BR and BD groups.Compared with group B,MWT and TWL were significantly increased at T5,6,and p-CaMK Ⅱ expression was down-regulated at T6 in group BR.There was no significant difference in MWT,TWL,and p-CaMK Ⅱ expression at each time point between group B and group BD.Conclusion Resveratrol can alleviate hyperalgesia in rats with bone cancer pain and inhibited activation of CaMK Ⅱ in spinal dorsal horn neurons may be involved in the mechanism.

Objective In many types of epithelial tumors,down-regulation or mutation of the epithelial cell-adherent molecule E-cadherin is associated with an increased invasiveness that can be prevented by the forced expression of the cell-adherent molecule.This suggests that E-cadherin is a latestage tumor suppressor that prevents invasion and metastasis.This study was to investigate cell invasion and migration status of human ovary serous cystadeno carcinoma HO-8910 cell line when the E-cadherin expression was down-regulated with RNA interference(RNAi) technology. Methods E-cadherin siRNA was transfected into HO-8910 cells to inhibit the expression of E-cadherin.The effect of RNAi was detected by immunofluoresence assay and Western blotting.The invasive ability of the cancer cells was determined by Transwell assay. Results After RNAi,the expressions of E-cadherin were significantly decreased from 63.7% to 11.9%(P

OBJECTIVE To investigate the bacteriologic feature and the spectrum of drug resistance in lung cancer patients who got nosocomial nonfermenters bacteria infection,and to conclude the experience and how to prevent and control the nosocomial infection.METHODS A rectrospective analysis of the composition of the pathogens,the feature of drug resistance and the prognosis of 109 lung cancer inpatients with nosocomial infection was made.RESULTS Nosocomial nonfermenters bacteria infections were most happened in hospital lung cancer patients.Main strains included Pseudomonas aeruginosa 55(49.5%),Acinetobacter baumannii 23(20.7%),and Stenotrophomonas maltophilia 8(7.2%).The sensitive rate of P.aeruginosa to imipenem was 100%,but to Cotrimoxazole,the resistant rate was 100%.The sensitive rate was relatively high to ticarcillin,piperacillin and their compounds.The antimicrobial resistance rate of A.baumannii was higher than P.aeruginosa.Stenotrophomonas were resistant to most antibiotics,and the resistance rate to imipenem was 100.0%.CONCLUSIONS The resistance rate of nosocomial nonfermenters bacteria infection is high.The treatment is difficult and the prognosis is bad.The mortality of multiple infection is high.