Ethyl acetate extract of Pleione bulbocodioides(Franch.)Rolfe induces apoptosis of human leukemia K562 and HL-60 cells through intrinsic mi-tochondrial apoptosis pathway / 中国病理生理杂志

AIM:To investigate the effects of ethyl acetate(EtOAc)extract of Pleione bulbocodioides (Franch.)Rolfe on proliferation and apoptosis of human leukemia K 562 and HL-60 cells and the possible apoptosis path-way.METHODS:Human leukemia cell lines were treated with EtOAc extract of Pleione bulbocodioides at different con-centrations.XTT method was used to evaluate the viability of K 562 cells and HL-60 cells.The cell growth inhibition was calculated by Trypan blue exclusion test.The percentage of apoptotic cells was determined by flow cytometry,and 4,,6-dia-midino-2-phenylindole(DAPI)was used to observe morphological changes of the cells.The cell cycle was observed by pro-pidium iodide(PI)staining.The protein expression of Bcl-2, Bax, cleaved poly(ADP-ribose)polymerase(PARP), cleaved caspase-3,cytochrome C and apoptosis-inducing factor(AIF)wase determined by Western blot.RESULTS:The cell viability and proliferation were inhibited by EtOAc extract of Pleione bulbocodioides with IC50of(42.14 ±2.54)mg/L for HL-60 cells and(51.28 ±3.12)mg/L for K562 cells at 24 h.The results of Annexin V-FITC/PI and DAPI staining showed that EtOAc extract of Pleione bulbocodioides induced cell apoptosis in a dose-dependent manner.The apoptotic rate was increased compared with control group(P<0.05).The G2phase increased with typical cell apoptosis-induced mor-phological changes.The levels of pro-apoptotic proteins Bax,cleaved PARP and cleaved caspase-3 were increased, while Bcl-2 was down-regulated(P<0.05).Cytochrome C and AIF in cytosol,characteristic proteins of intrinsic mitochondrial apoptosis pathway,also increased with the concentration of EtOAc extract of Pleione bulbocodioides increasing(P<0.05). CONCLUSION:EtOAc extract of Pleione bulbocodioides significantly inhibits cell proliferation and induces cell apoptosis in human leukemia cell lines HL-60 and K562 through intrinsic mitochondrial apoptosis pathway.

Construction of plant expression vectors with PMI gene as selection marker and their utilization in transformation of Salvia miltiorrhiza f. alba / 中国中药杂志

<p><b>OBJECTIVE</b>To construct plant expression pCAMBIA1301-PMI by substituting PMI for hygromycin resistance gene in pCAMBIA1301 and obtain transgenic Salvia miltiorrhiza f. alba using PMI-mannose selection system.</p><p><b>METHOD</b>The 6-phosphomannose isomerase gene (PMI) of Escherichia coli was amplified by PCR. Sequence analysis showed that it shared 100% amino acids identities with the sequences of PMI genes isolates reported in the NCBI. Based on pCAMBIA1305, the plant expression pCAMBIA1305-PMI was constructed successfully by substituting PMI for hygromycin resistance gene in pCAMBIA1305. pCAMBIA1305-PMI was transformed into Agrobacterium tumefaciens LBA4404, and then the leaves of S. miltiorrhiza f. alba were inoculated in LBA4404 with pCAMBIA1305-PMI.</p><p><b>RESULT</b>Plant expression pCAMBIA1301-PMI was successfully constructed and the leaves of S. miltiorrhiza f. alba inoculated in LBA4404 with pCAMBIA1305-PMI were selected on medium supplemented with a combination of 20 g x L(-1) mannose and 10 g x L(-1) sucrose as a carbon source. The transformation efficiency rate was 23.7%.</p><p><b>CONCLUSION</b>Genetic transformation was confirmed by PCR, indicating that a new method for obtaining transgenic S. miltiorrhiza f. alba plants was developed using PMI-mannose selection system.</p>

Study on effective constituents extracted from fibrous roots of Salvia miltiorrhiza with degrading multi-enzymes from taishan Ganoderma lucidum / 中国中药杂志

<p><b>OBJECTIVE</b>To study the application of degrading multi-enzymes from Ganoderma lucidum in extracting effective constituents from fibrous roots of Salvia miltiorrhiza.</p><p><b>METHOD</b>Effective constituents were extracted from fibrous roots by degrading multi-enzymes of wood fiber. The enzymatic parameters were optimized by the orthogonal design.</p><p><b>RESULT</b>The extraction efficiencies of total tanshinones and total salvianolic acids in the extracts of fibrous roots of S. miltiorrhiza was obtained using optimum enzymolysis process reached 11.923%, 12.465%, respectively, which were 62.794%, 56.086% more than that by conventional non-enzymatic hydrolysis.</p><p><b>CONCLUSION</b>Degrading multi-enzymes of wood fiber can be used to fully extract effective constituents from fibrous roots of S. miltiorrhiza, which provides a new approach for recycling wastes of traditional Chinese medicines.</p>

Clone, Expression and Characterization of the Thermostable ?-Galactosidase from Soil Metagenomic DNA of Taishan Mountain / 微生物学通报

A possible ?-Galactosidase gene(pwtsA) was discovered from soil metagenomic DNA of Taishan Mountain.PwtsA gene was inserted into the expression vector pET30a and transferred into E.coli BL21(DE3).Recombinant protein PWTSA was expressed as a soluble form at high level through IPTG induction,with a molecular mass of 57 kD analyzed by SDS-PAGE.PWTSA can produce o-nitrophenol from o-nitrophenol-?-D-galactopyranoside(ONPG),and its specific activity was determined as 13.6 U/mg.The enzymatic studies demonstrated that the recombinant protein PWTSA was a thermostable ?-Galactosidase,its optimum temperature and pH were 85?C～95?C and 6.5 respectively.In standard assays,the Km for ONPG was 0.83 mmol/L.