Function of GATA transcription factors in hydroxyurea－induced HEL cells-中国期刊网

摘要 HELcells,ahumanerythroleukemiacellline,mainlyexpressthefetal(γ)globingeneandtraceamountoftheembryonic(ε)globingene,butnotadult(β)globingene.Hereweshowthathydroxyurea(HU)caninduceHELcellstoexpressadult(β)globingeneandleadthesecellstoterminaldifferentiation.ResultsshowedinGelmobilityshiftassaysthatGATAfactorscouldspecificallybindtotheregulatoryelementsofhumanβ-globingene,includingtheproximalregulatoryelement(theβ-promoter)andthedistalregulatoryelements(theDNaseIhypersensitivesitesintheLCR,HS2-HS4coresequences).However,theDNAbindingpatternsofGATAfactorswerequitedifferentbetweenHU-inducedanduninducedHELcells.Western-blotanalysisofnuclearextractsfromboththeuninducedandHU-inducedHELcellsrevealedthatthelevelofGATA-2transcriptionfactordecreased,whereasthelevelofGATA-1transcriptionfactorincreasedfollowingthetimeofhydroxyureainduction.Furthermore,usingRT-PCRanalysistheexpressionofhumanβ-globingeneinHU-inducedHELcellscouldbeblockedagainwhenHELcellswereincubatedinthepresenceofantisenseoligonucleotidesforhGATA-1,suggestingthattheupregulationofhGATA-1transcriptionfactormightbecriticalfortheexpressionofhumanβ-globingeneinHU-inducedHELcells.

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Function of GATA transcription factors in hydroxyurea－induced HEL cells

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Function of GATA transcription factors in hydroxyurea－induced HEL cells

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