Simultaneous silence of bcl-2 and XIAP increases radiosensitivity of UMSCC12 head and neck cancer cells / 中华放射医学与防护杂志

Objective To investigate the radiosensitization effect of the simultaneous silence of bcl-2 and XIAP on human head and neck cancer cell line in vitro.Methods Four groups of UMSCC12 cells were transfected with siRNA-bcl-2,siRNA-XIAP,siRNA-bcl-2 plus siRNA XIAP,and siRNA control,respectively.The silence efficiency was tested by Western blot assay. Apoptosis was evaluated with the activities of caspase-3 and caspase-9,and radiosensitization effect was evaluated with clonogenic assay.Results Bcl-2 and XIAP protein expressions were effectively eliminated in the cells simultaneously transfected with siRNA-bcl-2 and siRNA-XIAP.Transfection of cells with bcl-2 siRNA increased radiationinduced apoptosis ( t =5.32,6.27 ; P ＜ 0.05 ),but transfection with XIAP siRNA did not impact cell apoptosis.Since the simultaneous transfection of the above two siRNAs,the activities of caspase-3 and caspase-9 were increased by 1.36 and 1.34 times ( t =11.47,6.22 ; P ＜ 0.05 ) in nonirradiated cells and increased by 1.72 and 1.98 times ( t =12.02,20.14; P ＜ 0.05 ) in irradiated cells,respectively.The colonic assay showed that the SERs were 1.06,1.15 and 1.41 for the cells transfected with XIAP siRNA,bcl-2 siRNA and both siRNAs,respectively.Conclusions Compared to single silence of XIAP or bcl-2,simultaneous silence of XIAP and bcl-2 offers a potential approach to improving the radiosensitivity of the head and neck cancer cells,and apoptosis might contribute to the enhancement of radiosensitization.

Observation of Antibacterial Activity of Galla Chinensis Ethanol Extractant Against Staphylococcus Epidermidis and Its Morphology Change / 中国中医药信息杂志

Objective To evaluate the antibacterial activity in vitro of Galla Chinensis ethanol extractant(GCEE)against S.epidermidis,and the change of cell morphology of S.epidermidis.Methods Deterimination of antibacterial activity of GCEE against 124 strains S.epidermidis was performed by using agar dilution method,and the changes of cell merphalogy of S.epidermidis was examined by microscope.Results The MIC90 of GCEE against 43 strains of MRSE(methicillin-resistant staphylococcus epidermidis)and 81 strains of MSSE(methicillin-sensitive staphylococcus epidermidis)were 0.288 and 0.144 mg/mL respectively.Under microscope,the cells of S.epidermidis were expansion by degrees,with the edge of cell of S.epidermidis irregular.The substances in cells of S.epidermidis were disappear final.Conclusion Galla Chinensis ethanol extractant had strong antibacterial activity against 124 strains of S.epidermidis,and the cell morphology of S.epidermidis changed.