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1、基于VEGFR靶点的小分子肿瘤靶向抑制肽的"mTc标记及鉴定冯世斌1,李前伟I郑磊I邹凌云S查林1,任浩I黄定德【(400038重庆,第三军医大学:西南医院核医学科';基础部微生物学教硏室2)[摘要]目的探讨基于血管内皮生长因子受体(vascularendothelialgrowthfactorreceptor,VEGFR)靶点的小分子肿瘤靶向抑制肽理想的放射性核索"“Tc标记方法。方法多肽QKRKRKKSRKKH、RKRKRKKSRYIVLS分别经双功能螯合剂S-acetyl-MAG3^G(d・A)GG、HYN
2、IC修饰后进行放射性核素"mTc标记,HPLC及纸层析法鉴定其标记率及放化纯度,3H-TdR参入实验鉴定其抑制细胞增葡的能力,体外受体竞争结合实验鉴定其受体结合活性。结果以HYNIC为双功能螯合剂,这2条多肽的""Tc标记率分别为(94.13±1.77)%、(93.79+3.53)%,明显高于S-acetyI-MAG5>G(d-A)GG修饰多肽的标记率。经HYNIC修饰后的多肽对肿瘤细胞A549增殖的抑制率约为(32.86土3.36)%、(61.50±4.50)%,与修饰前无明显变化(P>0.05);多肽标记后仍
3、保持了良好的VEGFR结合活性,室温下放置24h后,放化纯度仍高达90%左右。结论以HYNIC为双功能螯合剂,以TPPTS为协同配体及还原剂,多肽QKRKRKKSRKKH、RKRKRKKSRYIVLS的"niTc标记率高,且仍具有良好的抑制肿瘤细胞增殖的能力和VEGFR结合活性。[关键词]血管内皮生长因子;双功能螯合剂;核素标记,肿瘤显像[中图法分类号][文献标志码]ARadionuclidelabelingofsmallmolecularinhibitorypeptidestargetingVEGFrecept
4、orFengShibin1,LiQianwei1,ZhengLei1,ZouLingyun2,ZhaLin1,RenHao1,HuangDingdeDepartmentofNuclearMedicine,SouthwestHospital,2DepartmentofMicrobiology,CollegeofBasicMedicalSciences,ThirdMilitaryMedicalUniversity,Chongqing,400038,China)[Abstract]ObjectiveToinvestig
5、ateradionuclidelabelingmethodsofsmallmolecularinhibitorypeptidetargetingvascularendothelialgrowthfactorreceptor(VEGFreceptor)oftumorwith"mTc・MethodsAfterbeingmodifiedbyS-acetyl-MAG3,G(d-A)GGandHYNICrespectively,QKRKRKKSRKKHandRKRKRKKSRYIVLSwerelabeledwith"nvT
6、c.LabelingefficiencyandradiochemicalpuritywasidentifiedbypaperchromatographyandHPLC・Theinhibitoryaflectofpeptidetotumorcellwastestifiedby^H-TdRincorporation.ReceptorcompetitionbindingassaywasusedtotestifytheaffinityofpeptideligandbasedonA549cells.ResultsThela
7、belingefficiencyoftwopeptidemodifiedbythreebifunctionalchelatingagentswasabout78%,40%and94%respectively.TheinhibitoryefficiencyofHYNIC・QKRKRKKSRKKHandHYNIC-RKRKRKKSRYIVLStoA549cellswasabout33%and61%,anddidnothavestatisticallysignificantdifferencewithQKRKRKKSR
8、KKHandRKRKRKKSRYIVLS.Meanwhilethe"mTc-HYNIC-QKRKRKKSRKKHandHYNIC-RKRKRKKSRYIVLSretainedagoodstabilityandbindingactivityofVEGFreceptorinA549cells.ConclusionHYNIC-QKRKRKKSRKKHandHYNIC-RKRKR