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ID:36902550
大小:697.60 KB
页数:19页
时间:2019-05-10
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1、PathwayProfilingSystemContentsIntroduction12Associatedvectors3experiment4SignaltransductionresearchThePathwayProfilingSystemsprovideameanstoassesssignaltransductionpathwayactivationinvivoThesesystemsconsistofsetsofvectorsthateachcontainadistinctcis-actingenhancereleme
2、ntupstreamofareportergene1.IntroductionBroad-spectrumprofiling:SEAP(分泌型碱性磷酸酶)SystemorLuciferase(荧光素酶)SystemsSEAP2Luciferase5Luciferase3tLuciferase2PathwayprofilingsystemMoredetailsLuciferase42.SignaltransductionresearchLuciferase4Luciferase2Luciferase3SEAP2investigat
3、enuclearhormonereceptorsstudiesofPKC&calciumsignalingpathwaysstudiesofcellproliferation&differentiationstudiesofcheckpointsinthecellcyclefunctionLuciferase5studiesofcellinflammation&proliferation2.1报告基因secretedalkalinephosphatasereporter(SEAP,分泌型碱性磷酸酶报告基因):是人胎盘碱性磷酸酶突交
4、体,具有耐热性,能分泌到细胞外,而且在L-高精氨酸(L-homoarginine)存在下活性亦不变(内源性的碱性磷酸酶会在其存在下失活)。--由于该酶能分泌到细胞外,在检测时,可以在不破坏细胞的情况下,任意时间都可以取细胞培养上清液进行重复的,动态的检测,且被检测细胞还可以用做其它的用途。是一个很有前途的报告基因。以间硝基苯磷酸盐(PNPP)为底物时可用标准的比色法测定酶活性,操作简单,反应时间短,价格廉价,但灵敏度低。以黄素腺嘌呤二核苷酸磷酸为底物进行比色测定,其灵敏度增高。SEAP可催化D-荧光素-O-磷酸盐水解生成D-荧光素
5、,后者又可作为荧光素酶的底物,此即两步生物发光法检测酶活性的原理。此方法灵敏度高,接近于荧光素酶报告基因的检测,还可用一步化学发光法检测酶活性。Luciferasereportor(荧光素酶报告基因):荧光素酶(luciferase)催化底物荧光素的转化,发射出光子。目前较灵敏的检测系统为双荧光素酶检测系统萤火虫荧光素酶(Fireflyluciferase)和海肾荧光素酶(Ranillaluciferase)催化的发光反应。2.23.AssociatedvectorscontrolGeneralizedmapofthepathwa
6、yprofilingvectorsThecis-actingenhancerelementvectorconstructsinthepathwayprofilingsystemspTAL-SEAP/Lucvectorscanbeusedtodeterminethebackgroundsignalsassociatedwiththeculturemedium.Aditionally,thesevectorscanbeusedforstudyingputativeenhancerelements,whichcanbeclonedi
7、ntotheMCS.MapofpTAL-SEAP/LucpSEAP2-ControlconstiutivelyexpressesSEAPinmostcelltypes,whichmakesitiealforestabilshingtransfectionefficiencyandoptimizingyourSEAPassaydetectionmethod4.experimentprocedureAftertransfection:itisimportanttoremoveserumfromthemeiumtoensureprope
8、rinductionofthreporterSeruminducesvarioussignalingpathwayscausinghighbackground.Aboutstimulus:performatimecoursestudybycolle
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