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1、多巴胺受體在可卡因誘導(dǎo)的轉(zhuǎn)錄因子CREB活化中的作用作者:劉怒云1;張琳2;王小寧1;張璐2 (1南方醫(yī)科大學(xué)生物技術(shù)學(xué)院分子免疫研究所,廣東??廣州??510515;2南方醫(yī)科大學(xué)廣東省功能蛋白質(zhì)組學(xué)重點(diǎn)實(shí)驗(yàn)室,重大疾病的轉(zhuǎn)錄組與蛋白質(zhì)組學(xué)教育部重點(diǎn)實(shí)驗(yàn)室,廣東??廣州510515)摘要:目的研究多巴胺受體在可卡因誘導(dǎo)的轉(zhuǎn)錄因子CREB磷酸化活化中的調(diào)控作用。方法采用D1和D3多巴胺受體抑制劑,應(yīng)用Westernblotting檢測(cè)D1與D3多巴胺受體在可卡因誘導(dǎo)的cAMP反應(yīng)元件結(jié)合蛋白(CREB)磷酸化活
2、化中的作用及D1和D3多巴胺受體抑制劑本身對(duì)CREB磷酸化活化的影響,進(jìn)一步應(yīng)用Westernblotting檢測(cè)細(xì)胞外信號(hào)調(diào)節(jié)激酶(ERK)在CREB磷酸化活化中的作用。結(jié)果D1多巴胺受體抑制劑阻止可卡因誘導(dǎo)的CREB磷酸化活化,而D3多巴胺受體抑制劑促進(jìn)可卡因誘導(dǎo)的CREB磷酸化活化,D1和D3多巴胺受體抑制劑本身不能誘導(dǎo)CREB磷酸化活化。MEK的特異性抑制劑SL327可以抑制可卡因誘導(dǎo)的CREB磷酸化活化。結(jié)論D1和D3多巴胺受體對(duì)CREB的磷酸化活化起反式調(diào)控作用,并且這種反式調(diào)控作用依賴(lài)于ERK信號(hào)通
3、路。關(guān)鍵詞:可卡因;多巴胺受體;cAMP反應(yīng)元件結(jié)合蛋白;細(xì)胞外信號(hào)調(diào)節(jié)激酶;基因表達(dá)中圖分類(lèi)號(hào):Q189??文獻(xiàn)標(biāo)識(shí)碼:A??文章編號(hào):1673-4254(2006)06-0715-04Dopaminereceptorsoppositelyregulatecocaine-inducedtranscriptionfactorCREBactivationLIUNu-yun1;ZHANGLin2;WANGXiao-ning1;ZHANGLu21InstituteofMolecularImmunology,Southe
4、rnMedicalUniversity,Guangzhou510515,China;22DepartmentofPathophysiology,KeyLaboratoryofFunctionalProteomicsofGuangdongProvince,KeyLaboratoryforTranscriptomicsandProteomicsofMinistryofEducation,SouthernMedicalUniversity,Guangzhou510515,ChinaAbstract:ObjectiveT
5、ostudytheroleofdopaminereceptorsintheregulationoftheactivityoftranscriptionfactorcAMPresponseelement-bindingprotein(CREB)aftercocainetreatment.MethodsByusingdopaminereceptorantagonistsSCH23390andnafadotride,theactivationofCREBbyD1andD3dopaminereceptorsafterco
6、cainetreatmentandroleofextracellularsignal-regulatedkinase(ERK)incocaine-inducedCREBactivationwereexaminedbyWesternblotting,whichwasalsoemployedfordeterminationoftheeffectofSCH23390andnafadotrideonCREBactivation.ResultsD1receptorantagonistcouldinhibitcocaine-
7、inducedCREBactivation,whileD3receptorantagonistenhancedcocaine-inducedCREBactivation.DopaminereceptorantagonistsSCH23390andnafadotridedidnotinduceCREBactivation.SL327,aMEKinhibitor,inhibitedcocaine-inducedCREBactivation.ConclusionD1andD3dopaminereceptorscanop
8、positelyregulateCREBactivationaftercocainetreatmentandthisregulationdependsonERKsignalingpathway.Keywords:cocaine;dopaminereceptor;cAMPresponseelement-bindingprotein;extracellularsignal-r