Application of SKy bone expander system in percutaneous kyphoplasty for treatment of osteoporotic vertebra compression fracture / 第二军医大学学报

Objective: To evaluate the clinical efficacy of SKy bone expander system in percutaneous kyphoplasty for treatment of osteoporotic verterbral compression fracture. Methods: Twenty-two patients (aged 62-90 years, 32 vertebrae) underwent percutaneous kyphoplasty using SKy bone expander system. The bone cement was injected into the collapsed vertebrae. The vasual analogue scale (VAS) and complications were recorded during follow up. Results: The operations were successful in all patients via unilateral or bilateral approach. The operation time ranged from 30 to 120 min. The mean volume of cement injected into each vertebra body was (4.8±1.1) ml, ranged from 3.1 to 6.8 ml. Extravertebral leakage of bone cement was observed in two vertebrae with no symptoms. All patients had their pain relieved; the VAS was 7.6±0.8 before operation,3.5± 0.5 one day after operation, 2.8±0.6 one week after operation, and 2.4±0.6 one month after operation, with significant difference found between preoperation and postoperation (P<0.05). The symptoms of the patients were improved during a follow up of 12-26 months without recurrence. Conclusion: Application of SKy bone expander system in percutomeous kyphoplasty can relieve pain and restore the vertebrae height; it may be an effective treatment for aged patients with osteoporotic verterbral compression fracture.

Preliminary Results for the Treatment of a Pain-Causing Osteoporotic Vertebral Compression Fracture with a Sky Bone Expander

OBJECTIVE: Vertebral compression fractures (VCFs) are common complications of osteoporosis. The expansion of VCFs with a Sky Bone Expander is a new procedure which improves kyphotic deformities and decreases pain associated with VCFs. The purpose of this study was to investigate the preliminary results for the treatment of painful osteoporotic VCFs with a Sky Bone Expander. MATERIALS AND METHODS: Twenty-six patients with pain-causing VCFs were treated with a Sky Bone Expander. This operation involved the percutaneous insertion of the Sky Bone Expander into a fractured vertebral body transpedicularly. Following the expansion, the Sky Bone Expander was contracted and removed, resulting in a cavity to be filled with bone cement. All fractures were analyzed for improvement in sagittal alignment. Clinical complications, pain relief and ambulation status were evaluated 1 day, 1 week, 1 month, and 3 months after the operation. RESULTS: Twenty-four hours after the operation, all the patients treated experienced some degree of pain relief. In addition, no postoperative neurologic complications were noted. The average operative time was 42.4 +/- 15.5 min per vertebra. Moreover, an average cement volume of 3.5 mL (range, 2.5 +/- 5.0 mL) was injected per vertebra. The average anterior height was 18.4 +/- 5.1 mm preoperatively and 20.5 +/- 5.3 mm postoperatively (p < 0.01). Furthermore, the average midline height was 15.5 +/- 5.2 mm preoperatively and 18.9 +/- 4.0 mm postoperatively (p < 0.01). The Cobb angle improved from 18.5 +/- 8.2 degrees preoperatively to 9.2 +/- 4.0 degrees postoperatively (p < 0.01). The Visual Anabog Scale scores decreased from 7.7 +/- 1.8 points preoperatively to 3.1 +/- 2.0, 2.9 +/- 1.7, 2.6 +/- 1.5 and 2.9 +/- 11.3 after 1 day, 1 week, 1 month and 3 months after the operation, respectively. Cement extrusion was observed in four patients without any neurologic symptoms. CONCLUSION: As a result of this study, we can postulate that the expansion of compressed vetrebra with a Sky Bone Expander is a safe and minimally invasive procedure resulting in the restoration of vertebral body height and the relief of pain associated with VCFs.

Construction Fermentation of Engineered Strain and Properties of Recombinant ?-glutamyltranspeptidase / 中国生物工程杂志

The ?glutamyltranspeptidase encoding gene(ggt) from Bacillus subtilis SYU 20016 was amplified by PCR. The ggt gene was inserted in pBV220 to yield the recombinant expression vector pBV220ggt. Overexpression of ggt in E.coli JM109 was achieved with pBV220ggt. SDSPAGE analysis showed an overexpressed recombinant product at about 65kDa,consistent with the molecular weight predicted from gene sequence. The ferment conditions of r-glutamyltranspeptidase were also discussed. The optimum temperature and pH for the enzyme were determined as 30℃ and 7.2 respectively.The cultures were incubated at 42℃ for 4h with broth volume 20ml/250ml flask and the yield of 6U/ml was obtained, enzyme activity of B. subtilis NX2 was only 3.2 U/ml.

Heterologous Expression of Zygosacharomyces rouxii ZrGpd 1 in Pichia farinosa / 中国生物工程杂志

To examine the effects of heterologous expression of ZrGPD1 (encoding glycerol 3-phosphate dehydrogenase ) cloned from osmotolerant yeast Zygosacharomyces rouxii on glycerol production in wild Pichia farinosa,the URA3 gene was amplified from P. farinosa as the homology integrative region. A recombinant plasmid (pUR-ZG) was constructed then transformed into P. farinosa by electroporation. The transformant pfa-gu was obtained by the selectable marker Zeocin TM . Primary results showed that the biomass of pfa-gu was higher than the wild type in the flask and after 72h fermentation the concentration of glycerol of pfa-gu was 37g/L enhanced 30% in comparison with the wild type. It is concluded that heterologous expression of ZrGPD1 is useful for increasing glycerol production and the ability of osmoregulation in P. farinosa.

Construction of novel recombinant Escherichia coli capable of producing 1,3-propanediol / 生物工程学报

The 1,3-propanediol oxidoreductase isoenzyme encoding gene (yqhD) from E. coli was amplified by PCR. yqhD was inserted in pEtac to yield the recombinant expression vector pEtac-yqhD. Over-expression of yqhD in E. coli JM109 was achieved with pEtac-yqhD. SDS-PAGE analysis showed an over-expressed recombinant product at about 43 kD, consistent with the molecular weight predicted from gene sequence. Compared with E. coli JM109 (pEtac), the 1,3-propanediol oxidoreductase isoenzyme activity of the recombinant E. coli (pEtac-yqhD) reached 120 u/mg protein under the induction of 1.0 mmol/L IPTG at 37 degrees C for 4 hours; at similar conditions, enzyme activity of E. coli JM109 (pEtac) was only 0.5 u/mg protein. The recombinant E. coli JM109 (pUCtac-dhaB, pEtac-yqhD) was constructed. After induction with 1.0 mmol/L IPTG, the recombinant strain could transform 50 g/L glycerol to 38 g/L 1,3-propanediol under aerobic conditions. This work demonstrated firstly that the 1,3-propanediol oxidoreductase isoenzyme could show high activity under aerobic conditions.

Study on fermentation condition of alkaline protease gene engineering strain and the purification and characterization of recombinant enzyme / 生物工程学报

In a 5L fermentor the production conditions of alkaline protease gene engineering strain BA071 were investigated. The maximum activity of alkaline protease reached 24,480 u/mL in 40 hours of fermentation by combination of enhancing aeration and changing the agitation rate. The fast purification method of recombinant protease was conducted with FPLC (Fast Protein Liquid Chromatography). The crude enzyme, treated with ammonium sulfate fractionation and decolored with DEAE-A-50 and polyethylene glycol concentration, was purified with CM-Sephadex-C-50 and Sephadex-G-75. The purified enzyme appears homologous on SDS-PAGE. The purity of enzyme was increased 76.2 times. SDS-PAGE analysis showed that the molecular weights of expressed recombinant products were about 28 kD. The optimal reaction pH and temperature of recombinant enzyme were at pH11 and 60 degrees C, respectively. The recombinant enzyme exhibited high temperature tolerance and was stable at a wide range of pH. Ca2+, MG2+ can enhance the stability of the recombinant enzyme. While the protease activity of the enzyme was strongly inhibited by Hg2+, Ag+, PMFS [symbol: see text] DFP, and was not affected by SDS and Urea.

Application of SKy bone expander system in percutaneous kyphoplasty for treatment of osteoporotic vertebra compression fracture / 第二军医大学学报

Objective:To evaluate the clinical efficacy of SKy bone expander system in percutaneous kyphoplasty for treat- ment of osteoporotie verterbral compression fracture.Methods:Twenty-two patients(aged 62-90 years,32 vertebrae)under- went percutaneous kyphoplasty using SKy bone expander system.The bone cement was injected into the collapsed vertebrae. The vasual analogue scale(VAS)and complications were recorded during follow up.Results:The operations were successful in all patients via unilateral or bilateral approach.The operation time ranged from 30 to 120 min.The mean volume of cement in- jected into each vertebra body was(4.8?1.1)ml,ranged from 3.1 to 6.8 ml.Extravertebral leakage of bone cement was ob- served in two vertebrae with no symptoms.All patients had their pain relieved;the VAS was 7.6?0.8 before operation,3.5?0.5 one day after operation,2.8?0.6 one week after operation,and 2.4?0.6 one month after operation,with significant difference found between preoperation and postoperation(P