2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、y738157論文題目[理塑一丫738176洳專:J學(xué)位論文⑧浙江大學(xué)碩士論文AbstractColdandapoptosisaretightlycorrelatedandtheresearchoncold—inducedapoptosishasbecomeoneofthemostimportantfieldsinthetransplantationmedicineareaThesignaltransductioninvolvedint

2、hecoldinducedapoptosisisanfractuous,eithermediatedormodulatedbyreactiveoxygenspecies(ROS),Ca2,F(xiàn)e“andcold—relevantgenesinvivoHoweverlittleisknownaboutthesituationintheyeastAsyeasthasbeenextensivelycharacterizedbothbiochem

3、icallyandgeneticallywithitsgenetictractability,ithasbeenusedextensivelyasmodelsforgeneticanalysisofvariouscomplexpathwaysandprocesses,includingcelldivision,transcriptionandreceptormediatedsignaltransductionWetransformeda

4、ntiapoptoticgenesBcl2,CED9andPpBI1intotheyeasttoevaluatetheirfunctionofresistancetocoldstressTheresultsareasfonows:(1)Coldinducedapoptosisinyeastcells,moreover,yeastcellsdisplayrepresentivefeaturessuchaschromatincondensa

5、tion,DNAfragmentationandchromatinmargination(2)TheexpressionofBcl一2,CED一9andPpBI1significantlyinhibitscoldinducedapoptosisintheyeast(3)ROSandCa2actasintracellularsecondmessagertoinducecellapoptosisThepotentialmolecularme

6、chanismofcoldinducedcellapoptosisandhowBcl2,CED一9andPpBmfightsagainstcoldstessintheyeastisassociatedwiththeincreaseinintracellularROSandCa2inducedbycoldTheexpressionofPpBI1inhibitstheincreaseinintracellularC一,thusaUeviat

7、escellinjuriesinducedbyCa“(4)ColdinducedanincreaseinintracellularROS,howeveritCallnotbeinhibiteddirectlybytheexpressionofPpBl1InordertofurtherinvestigatetheroleofROSintheprocessofcold—inducedapoptosisandthemechanismofant

8、iapoptoticmembersmediatingROS,weusedwildstrainCY4andgshlmutantstrainCY8toinvestigatetheroleofPpBmmediatingROSResultsshowedthatexpressionofPpBmcouldrestorethegrowthofCY8andsignificantlyinhibitcoldinducedcellapoptosiswhena

9、ddingexogenousGSH,howeverexpressionofPpBI1couldnotrestorethegrowthofCY8andinhibitcold—inducedcellapoptosiswithoutexogenousGSHThesedatasuggestthepathwayofPpBI1againstROSstressisassociatedwithGSHdirectlyorindirectlyKeyword

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