PET Imaging of Extracellular pH in Tumors with (64)Cu- and (18)F-Labeled pHLIP Peptides: A Structure-Activity Optimization Study.

PET Imaging of Extracellular pH in Tumors with (64)Cu- and (18)F-Labeled pHLIP Peptides: A Structure-Activity Optimization Study.
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DOI:
10.1021/acs.bioconjchem.6b00306
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发表时间:
2016-09-21
影响因子:
4.7
通讯作者:
Lewis, Jason S.
Lewis, Jason S.
中科院分区:
化学2区
文献类型:
--
作者:
Demoin, Dustin Wayne;Wyatt, Linden C.;Edwards, Kimberly J.;Abdel-Atti, Dalya;Sarparanta, Mirkka;Pourat, Jacob;Longo, Valerie A.;Carlin, Sean D.;Engelman, Donald M.;Andreev, Oleg A.;Reshetnyak, Yana K.;Viola-Villegas, Nerissa;Lewis, Jason S.

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pH(低)插入肽(pHLIP肽)由于pH依赖性细胞膜插入而靶向体内酸性细胞外环境。两种变体(Var 3和Var 7)和野生型(WT)pHLIP肽已显示出用于乳腺癌体内成像的前景。使用两种正电子发射放射性核素(64 Cu和18 F)标记NOTA和NO 2A衍生的Var 3、Var 7和WT肽,用于4 T1原位荷瘤BALB/c小鼠的体内生物分布研究。所有构建体均以良好的产率用64 Cu或[18F]-AlF放射性标记。12种构建体在4 T1原位同种异体移植雌性BALB/c小鼠中的体内生物分布表明,用18F(4 T1摄取;在4 h p.i.或64 Cu(4 T1摄取; 8.2 ± 0.9%ID/g,在4 h p.i.和19.2 ± 1.8%ID/g(24 h p.i.),最有希望用于临床翻译。研究其他肿瘤模型(黑色素瘤、前列腺和脑肿瘤模型)的其他研究表明这些示踪剂的肿瘤靶向的普遍性。根据这项研究,未来的临床翻译将集中在18F或64 Cu标记的NO 2A-cysVar 3上。
pH (low) insertion peptides (pHLIP peptides) target acidic extracellular environments in vivo due to pH-dependent cellular membrane insertion. Two variants (Var3 and Var7) and wild-type (WT) pHLIP peptides have shown promise for in vivo imaging of breast cancer. Two positron emitting radionuclides (64Cu and 18F) were used to label the NOTA- and NO2A-derivatized Var3, Var7, and WT peptides for in vivo biodistribution studies in 4T1 orthotopic tumor-bearing BALB/c mice. All of the constructs were radiolabeled with 64Cu or [18F]-AlF in good yield. The in vivo biodistribution of the 12 constructs in 4T1 orthotopic allografted female BALB/c mice indicated that NO2A-cysVar3, radiolabeled with either 18F (4T1 uptake; 8.9 ± 1.7%ID/g at 4 h p.i.) or 64Cu (4T1 uptake; 8.2 ± 0.9%ID/g at 4 h p.i. and 19.2 ± 1.8% ID/g at 24 h p.i.), shows the most promise for clinical translation. Additional studies to investigate other tumor models (melanoma, prostate, and brain tumor models) indicated the universality of tumor targeting of these tracers. From this study, future clinical translation will focus on 18F- or 64Cu-labeled NO2A-cysVar3.
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