OBJECTIVE To identify the specific targets of a novel derivative of Danshensu ADTM as the protein disulfide isomerase(PDI)family proteins including ERp57.To further investigate the underlying mechanism of ADTM to modu...OBJECTIVE To identify the specific targets of a novel derivative of Danshensu ADTM as the protein disulfide isomerase(PDI)family proteins including ERp57.To further investigate the underlying mechanism of ADTM to modulate ERp57 to regulate platelet function with direct interaction withαⅡbβ3 integrin.METHODS To isolate the protein targets that bound to ADTM,a biotin-conjugated ADTM analogue(BAA)was designed and synthesized.BAA(300μmol·L-1)was incubated with rat blood platelet lysates and the BAA-protein complexes were pulled down with NeutrAvidin-agarose followed by protein profiling using LC-MS/MS.To determine platelet aggregation in vitro,rabbit platelets were incubated with the indicated concentrations of compounds and aggregation was induced by ADP(10μmol·L-1)or AA(200μmol·L-1)and measured using a platelet aggregometer.To determine platelet aggregation-induced by ADP in rat in vivo,ADTM(5-20mg·kg-1)in comparison with DSS(10mg·kg-1)and clopidogrel(18mg·kg-1)were administered daily by i.v.injection for 5d,respectively.To determine the action of ADTM on the ERp57/αⅡbβ3 interaction,it was examined by immunoprecipitation with anti-αⅡbβ3antibody,followed by detection of ERp57 immunoreactivity using immunoblotting.RESULTS BAA could bind to various proteins involved in platelet function.In particular,platelet aggregation-associated proteins were identified with>95% protein identification probability including ERp72,ERp57ERp5 and PDI,which are members of the protein disulfide isomerase(PDI)family related to platelet function and redox homeostasis.ADTM exhibited potent inhibition on the redox activity of ERp57 in a concentration-dependent manner(IC50=100 300μmol·L-1).In in vitro studies,ADTM exhibited concentration-dependent inhibition on ADP-induced and AA-induced platelet aggregation with comparable effects to aspirin and clopidogrel.In vivo study showed that ADP-induced platelet aggregation was significantly compromised(>40%reduction)in rats treated with ADTM(20mg·kg-1).Similarly,ADTM also exhibited significant anti-thrombotic effect in vivo as shown in the ferric chloride(FeCl3)-induced venous thrombosis.Immunoprecipitation with anti-αⅡbβ3antibody,followed by detection of ERp57 immunoreactivity using immunoblotting showed that ADTM disrupted the interaction of ERp57 with αⅡ bβ3.CONCLUSION These results demonstrated that ADTM exhibited broad-spectrum anti-platelet activities and ERp57 is a potential therapeutic target for anti-platelet therapy.展开更多
The protein disulfide isomerases（PDIs）family has a central function in the folding of proteins synthetized through the secretory pathway.ERp57,also known as Grp58 or PDIA3,is one of the main studied members of this ...The protein disulfide isomerases（PDIs）family has a central function in the folding of proteins synthetized through the secretory pathway.ERp57,also known as Grp58 or PDIA3,is one of the main studied members of this family.展开更多
目的观察创伤后应激障碍(PTSD)大鼠前额皮质(mPFC)神经元未折叠蛋白反应(unfolded protein response,UPR)标志物葡萄糖调节蛋白78(GRP78)和内质网调节蛋白57(ERP57)的表达变化,探讨内质网分子伴侣在PTSD发病机制中的作用。方法采用国际...目的观察创伤后应激障碍(PTSD)大鼠前额皮质(mPFC)神经元未折叠蛋白反应(unfolded protein response,UPR)标志物葡萄糖调节蛋白78(GRP78)和内质网调节蛋白57(ERP57)的表达变化,探讨内质网分子伴侣在PTSD发病机制中的作用。方法采用国际认定的PTSD动物模型-SPS大鼠模型,取80只成年雄性健康Wistar大鼠,随机分为正常组和SPS模型组(SPS1d,SPS4d,SPS7d),采用逆转录-聚合酶链式反应、免疫组织化学法和免疫印记检测PTSD-SPS大鼠m PFC神经元中GRP78和ERP57的表达变化。结果 SPS刺激后大鼠m PFC神经元细胞内GRP78和ERP57蛋白表达于1d开始逐渐升高,7d时表达最多;GRP78和ERP57的m RNA水平的变化与其蛋白表达变化相一致。结论 GRP78和ERP57在PTSD大鼠mPFC过表达可能参与SPS刺激诱导的UPR反应。展开更多
基金The project supported by National Natural Science Foundation of China(81403139)Research Committee of the University of Macao(MYRG2015-00161-ICMS-QRCM)
文摘OBJECTIVE To identify the specific targets of a novel derivative of Danshensu ADTM as the protein disulfide isomerase(PDI)family proteins including ERp57.To further investigate the underlying mechanism of ADTM to modulate ERp57 to regulate platelet function with direct interaction withαⅡbβ3 integrin.METHODS To isolate the protein targets that bound to ADTM,a biotin-conjugated ADTM analogue(BAA)was designed and synthesized.BAA(300μmol·L-1)was incubated with rat blood platelet lysates and the BAA-protein complexes were pulled down with NeutrAvidin-agarose followed by protein profiling using LC-MS/MS.To determine platelet aggregation in vitro,rabbit platelets were incubated with the indicated concentrations of compounds and aggregation was induced by ADP(10μmol·L-1)or AA(200μmol·L-1)and measured using a platelet aggregometer.To determine platelet aggregation-induced by ADP in rat in vivo,ADTM(5-20mg·kg-1)in comparison with DSS(10mg·kg-1)and clopidogrel(18mg·kg-1)were administered daily by i.v.injection for 5d,respectively.To determine the action of ADTM on the ERp57/αⅡbβ3 interaction,it was examined by immunoprecipitation with anti-αⅡbβ3antibody,followed by detection of ERp57 immunoreactivity using immunoblotting.RESULTS BAA could bind to various proteins involved in platelet function.In particular,platelet aggregation-associated proteins were identified with>95% protein identification probability including ERp72,ERp57ERp5 and PDI,which are members of the protein disulfide isomerase(PDI)family related to platelet function and redox homeostasis.ADTM exhibited potent inhibition on the redox activity of ERp57 in a concentration-dependent manner(IC50=100 300μmol·L-1).In in vitro studies,ADTM exhibited concentration-dependent inhibition on ADP-induced and AA-induced platelet aggregation with comparable effects to aspirin and clopidogrel.In vivo study showed that ADP-induced platelet aggregation was significantly compromised(>40%reduction)in rats treated with ADTM(20mg·kg-1).Similarly,ADTM also exhibited significant anti-thrombotic effect in vivo as shown in the ferric chloride(FeCl3)-induced venous thrombosis.Immunoprecipitation with anti-αⅡbβ3antibody,followed by detection of ERp57 immunoreactivity using immunoblotting showed that ADTM disrupted the interaction of ERp57 with αⅡ bβ3.CONCLUSION These results demonstrated that ADTM exhibited broad-spectrum anti-platelet activities and ERp57 is a potential therapeutic target for anti-platelet therapy.
基金FONDECYT 1161284(SM),Millennium Institute No.P09-015-F,Fondo de Financiamiento de Centros de Investigación enáreas Prioritarias(FONDAP)15150012(CHSM)+3 种基金the Frick Foundation No.20014-15,ALS Therapy Alliance 2014-F-059,Muscular Dystrophy Association 382453,Comisión Nacional de Investigación Científica y Tecnológica(CONICYT)CONICYTUSA2013-0003the Michael J.Fox Foundation for Parkinson’s Research No.9277,Fundación Copec–Universidad Católica No.2013.R.40,Ecos-Conicyt C13S02,FONDECYT 1140549,Office of Naval Research–Global(ONR-G)N62909-16-1-2003Amyotrophic Lateral Sclerosis Research Program Therapeutic Idea Award AL150111(C.H.)LB is supported by a CONICYT fellowship
文摘The protein disulfide isomerases（PDIs）family has a central function in the folding of proteins synthetized through the secretory pathway.ERp57,also known as Grp58 or PDIA3,is one of the main studied members of this family.
