简介:摘要目的研究胃癌细胞株SCG7901的VEGF/NRP-1自分泌信号途径及用单克隆抗体12G5阻断此途径对SCG7901细胞基因表达的影响。方法RT-PCR技术检测SCG7901细胞的VEGF165mRNA、NRP-1mRNA、CXCR4mRNA的表达。结果RT-PCR显示SCG7901细胞有VEGF165mRNA、NRP-1mRNA,CXCR4mRNA的表达,实验组的CXCR4mRNA表达明显低于对照组(P<0.01)。结论SCG7901细胞株中存在VEGF/NRP-1/CXCR4自分泌途径,12G5能在一定程度阻抑CXCR4mRNA的表达。
简介:Euphausiapacificisanimportantsourceofnaturalastaxanthin.StudieswerecarriedouttoassesstheextractabilityofastaxanthinfromE.pacificusingsubcritical1,1,1,2-tetrafluoroethane(R134a).Toexaminetheeffectsofmultipleprocessvariablesontheextractionyield,astaxanthinwasextractedundervariousconditionsofpressure(30-150bar),temperature(303-343K),time(10-50min),flowrate(2-10gmin-1),moisturecontent(5.5%-63.61%),andparticlesize(0.25-0.109mm).Theresultsshowedthattheextractionyieldincreasedwithtemperature,pressure,timeandflowrate,butdecreasedwithmoisturecontentandparticlesize.Amaximumyieldof87.74%wasobtainedunderconditionsof100bar,333K,and30minwithaflowrateof6gmin-1andamoisturecontentof5.5%.Thesubstantialastaxanthinyieldobtainedunderlow-pressureconditionsdemonstratesthatsubcriticalR134aisagoodalternativetoCO2forextractionofastaxanthinfromE.pacific.