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Gomari MM, Abkhiz S, Pour TG, Lotfi E, Rostami N, Monfared FN, Ghobari B, Mosavi M, Alipour B, Dokholyan NV. Peptidomimetics in cancer targeting. Mol Med 2022; 28:146. [PMID: 36476230 PMCID: PMC9730693 DOI: 10.1186/s10020-022-00577-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 11/16/2022] [Indexed: 12/12/2022] Open
Abstract
The low efficiency of treatment strategies is one of the main obstacles to developing cancer inhibitors. Up to now, various classes of therapeutics have been developed to inhibit cancer progression. Peptides due to their small size and easy production compared to proteins are highly regarded in designing cancer vaccines and oncogenic pathway inhibitors. Although peptides seem to be a suitable therapeutic option, their short lifespan, instability, and low binding affinity for their target have not been widely applicable against malignant tumors. Given the peptides' disadvantages, a new class of agents called peptidomimetic has been introduced. With advances in physical chemistry and biochemistry, as well as increased knowledge about biomolecule structures, it is now possible to chemically modify peptides to develop efficient peptidomimetics. In recent years, numerous studies have been performed to the evaluation of the effectiveness of peptidomimetics in inhibiting metastasis, angiogenesis, and cancerous cell growth. Here, we offer a comprehensive review of designed peptidomimetics to diagnose and treat cancer.
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Affiliation(s)
- Mohammad Mahmoudi Gomari
- grid.411746.10000 0004 4911 7066Department of Medical Biotechnology, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Shadi Abkhiz
- grid.411746.10000 0004 4911 7066Department of Medical Biotechnology, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Taha Ghantab Pour
- grid.411746.10000 0004 4911 7066Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Ehsan Lotfi
- grid.411746.10000 0004 4911 7066Department of Medical Biotechnology, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Neda Rostami
- grid.411425.70000 0004 0417 7516Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak, Iran
| | - Fatemeh Nafe Monfared
- grid.411705.60000 0001 0166 0922Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Babak Ghobari
- grid.412831.d0000 0001 1172 3536Department of Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
| | - Mona Mosavi
- grid.411746.10000 0004 4911 7066Department of Medical Biotechnology, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Behruz Alipour
- grid.411705.60000 0001 0166 0922Medical Biotechnology Department, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Nikolay V. Dokholyan
- grid.240473.60000 0004 0543 9901Department of Pharmacology, Penn State College of Medicine, Hershey, PA USA ,grid.240473.60000 0004 0543 9901Department of Biochemistry & Molecular Biology, Penn State College of Medicine, Hershey, PA USA
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Porphyrin-based Nanosonosensitizers Combined with Targeting Peptides for Sonodynamic Therapy of Glioma. CHINESE JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1007/s10118-022-2795-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ludwig BS, Tomassi S, Di Maro S, Di Leva FS, Benge A, Reichart F, Nieberler M, Kühn FE, Kessler H, Marinelli L, Reuning U, Kossatz S. The organometallic ferrocene exhibits amplified anti-tumor activity by targeted delivery via highly selective ligands to αvβ3, αvβ6, or α5β1 integrins. Biomaterials 2021; 271:120754. [PMID: 33756215 DOI: 10.1016/j.biomaterials.2021.120754] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 02/17/2021] [Accepted: 03/08/2021] [Indexed: 12/13/2022]
Abstract
High levels of reactive oxygen species (ROS) in tumors have been shown to exert anti-tumor activity, leading to the concept of ROS induction as therapeutic strategy. The organometallic compound ferrocene (Fc) generates ROS through a reversible one-electron oxidation. Incorporation of Fc into a tumor-targeting, bioactive molecule can enhance its therapeutic activity and enable tumor specific delivery. Therefore, we conjugated Fc to five synthetic, Arg-Gly-Asp (RGD)-based integrin binding ligands to enable targeting of the cell adhesion and signaling receptor integrin subtypes αvβ3, α5β1, or αvβ6, which are overexpressed in various, distinct tumors. We designed and synthesized a library of integrin-ligand-ferrocene (ILF) derivatives and showed that ILF conjugates maintained the high integrin affinity and selectivity of their parent ligands. A thorough biological characterization allowed us to identify the two most promising ligands, an αvβ3 (L2b) and an αvβ6 (L3b) targeting ILF, which displayed selective integrin-dependent cell uptake and pronounced ferrocene-mediated anti-tumor effects in vitro, along with increased ROS production and DNA damage. Hence, ILFs are promising candidates for the selective, tumor-targeted delivery of ferrocene to maximize its anti-cancer efficacy and minimize systemic toxicity, thereby improving the therapeutic window of ferrocene compared to currently used non-selective anti-cancer drugs.
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Affiliation(s)
- Beatrice Stefanie Ludwig
- Department of Nuclear Medicine, University Hospital Klinikum rechts der Isar, Technical University Munich, Munich, Germany; Central Institute for Translational Cancer Research (TranslaTUM), Technical University of Munich, Munich, Germany
| | - Stefano Tomassi
- Department of Pharmacy, University of Naples "Federico II", Naples, Italy
| | - Salvatore Di Maro
- Università degli Studi della Campania "Luigi Vanvitelli", Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, Caserta, Italy
| | | | - Anke Benge
- Department of Obstetrics and Gynecology, Clinical Research Unit, University Hospital Klinikum rechts der Isar, Technical University Munich, Munich, Germany
| | - Florian Reichart
- Institute for Advanced Study, Department of Chemistry, Technical University Munich, Garching, Germany
| | - Markus Nieberler
- Department of Oral and Maxillofacial Surgery, University Hospital Klinikum rechts der Isar, Technical University Munich, Munich, Germany
| | - Fritz E Kühn
- Molecular Catalysis, Catalysis Research Center, Technical University Munich, Munich, Germany; Department of Chemistry, Technical University Munich, Munich, Germany
| | - Horst Kessler
- Institute for Advanced Study, Department of Chemistry, Technical University Munich, Garching, Germany
| | - Luciana Marinelli
- Department of Pharmacy, University of Naples "Federico II", Naples, Italy
| | - Ute Reuning
- Department of Obstetrics and Gynecology, Clinical Research Unit, University Hospital Klinikum rechts der Isar, Technical University Munich, Munich, Germany
| | - Susanne Kossatz
- Department of Nuclear Medicine, University Hospital Klinikum rechts der Isar, Technical University Munich, Munich, Germany; Central Institute for Translational Cancer Research (TranslaTUM), Technical University of Munich, Munich, Germany; Department of Chemistry, Technical University Munich, Munich, Germany.
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Synthesis and Bioevaluation of Iodine-131 Directly Labeled Cyclic RGD-PEGylated Gold Nanorods for Tumor-Targeted Imaging. CONTRAST MEDIA & MOLECULAR IMAGING 2017; 2017:6081724. [PMID: 29434531 PMCID: PMC5757100 DOI: 10.1155/2017/6081724] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 12/04/2017] [Indexed: 01/09/2023]
Abstract
Introduction Radiolabeled gold nanoparticles play an important role in biomedical application. The aim of this study was to prepare iodine-131 (131I)-labeled gold nanorods (GNRs) conjugated with cyclic RGD and evaluate its biological characteristics for targeted imaging of integrin αvβ3-expressing tumors. Methods HS-PEG(5000)-COOH molecules were applied to replace CTAB covering the surface of bare GNRs for better biocompatibility, and c(RGDfK) peptides were conjugated onto the carboxyl terminal of GNR-PEG-COOH via EDC/NHS coupling reactions. The nanoconjugate was characterized, and 131I was directly tagged on the surface of GNRs via AuI bonds for SPECT/CT imaging. We preliminarily studied the characteristics of the probe and its feasibility for tumor-targeting SPECT/CT imaging. Results The [131I]GNR-PEG-cRGD probe was prepared in a simple and rapid manner and was stable in both PBS and fetal bovine serum. It targeted selectively and could be taken up by tumor cells mainly via integrin αvβ3-receptor-mediated endocytosis. In vivo imaging, biodistribution, and autoradiography results showed evident tumor uptake in integrin αvβ3-expressing tumors. Conclusions These promising results showed that this smart nanoprobe can be used for angiogenesis-targeted SPECT/CT imaging. Furthermore, the nanoprobe possesses a remarkable capacity for highly efficient photothermal conversion in the near-infrared region, suggesting its potential as a multifunctional theranostic agent.
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Liao Y, Yang L, Huang R, Wu J, Xie J, Bundhoo K, Liu Y, Hu G, Liu C, Bin J. Ultrasound molecular imaging of arterial thrombi with novel microbubbles modified by cyclic RGD in vitro and in vivo. Thromb Haemost 2017; 107:172-83. [DOI: 10.1160/th10-11-0701] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Accepted: 09/28/2011] [Indexed: 12/17/2022]
Abstract
SummaryDespite immense potential, ultrasound molecular imaging (UMI) of arterial thrombi remains very challenging because the high-shear arterial flow limits binding of site-targeted microbubbles to the thrombi. The linear Arg-Gly-Asp (RGD) peptides have been successfully applied to evaluate venous, atrial, and arteriolar thrombi, but have thus far failed in the detection of arterial thrombi. Cyclic RGD (Arg-Gly-Asp-D-Phe-Cys) is a cyclic conformation of linear RGD peptides, which has much higher binding-affinity and selectivity for binding to the glycoprotein (GP) IIb/IIIa receptor than its linear counterpart and thus is likely to be an optimal targeted molecular probe for ultrasound molecular imaging of arterial thrombi. In this study, we sought to assess the feasibility of a novel microbubble conjugated with cyclic RGD (Mb-cyclic RGD) in UMI of arterial thrombi in vitro and in vivo. As expected, Mb-cyclic RGD had greater GP IIb/IIIa-targeted binding capability in all shear stress conditions. In addition, the shear stress at half-maximal detachment of Mb-cyclic RGD was 5.7-fold higher than that of microbubbles with nonspecific peptide (Mb-CON) (p<0.05). Mb-cyclic RGD enhanced the echogenicity of the platelet-rich thrombus in vitro whereas Mb-CON did not produce enhancement. In the in vivo setting, optimal signal enhancement of the abdominal aortic thrombus was displayed with Mb-cyclic RGD in all cases. Mean video intensity of the abdominal aortic thrombi with Mb-cyclic RGD was 3.2-fold higher than that with Mb-CON (p<0.05). The novel Mb-cyclic RGD facilitated excellent visualisation of arterial thrombi using UMI and showed great promise for clinical applications.
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CHEN LIN, LI BAOLIN, XIAO XIAO, MENG QINGGANG, LI WEI, YU QIAN, BI JIAQI, CHENG YONG, QU ZHIWEI. Preparation and evaluation of an Arg-Gly-Asp-modified chitosan/hydroxyapatite scaffold for application in bone tissue engineering. Mol Med Rep 2015; 12:7263-70. [PMID: 26459053 PMCID: PMC4626170 DOI: 10.3892/mmr.2015.4371] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 08/07/2015] [Indexed: 11/26/2022] Open
Abstract
Bone tissue engineering has become a promising method for the repair of bone defects, and the production of a scaffold with high cell affinity and osseointegrative properties is crucial for successful bone substitute. Chitosan (CS)/hydroxyapatite (HA) composite was prepared by in situ compositing combined with lyophilization, and further modified by arginine‑glycine‑aspartic acid (RGD) via physical adsorption. In order to evaluate the cell adhesion rate, viability, morphology, and alkaline phosphatase (ALP) activity, the RGD‑CS/HA scaffold was seeded with bone marrow stromal cells (BMSCs). The osseointegrative properties of the RGD‑CS/HA scaffold were evaluated by in vivo heterotopic ossification and in vivo bone defect repair. After 4 h culture with the RGD‑CS/HA scaffold, the adhesion rate of the BMSCs was 80.7%. After 3 days, BMSCs were fusiform in shape and evenly distributed on the RGD‑CS/HA scaffold. Formation of extracellular matrix and numerous cell‑cell interactions were observed after 48 h of culture, with an ALP content of 0.006 ± 0.0008 U/l/ng. Furthermore, the osseointegrative ability and biomechanical properties of the RGD‑CS/HA scaffold were comparable to that of normal bone tissue. The biocompatibility, cytocompatibility, histocompatibility and osseointegrative properties of the RGD‑CS/HA scaffold support its use in bone tissue engineering applications.
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Affiliation(s)
- LIN CHEN
- Department of Pathogenic Microorganisms, The Second Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
| | - BAOLIN LI
- Department of Orthopedic Surgery, The First Hospital of Harbin City, Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - XIAO XIAO
- Department of Orthopedic Surgery, The First Hospital of Harbin City, Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - QINGGANG MENG
- Department of Orthopedic Surgery, The First Hospital of Harbin City, Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - WEI LI
- Department of Orthopedic Surgery, The First Hospital of Harbin City, Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - QIAN YU
- Department of Orthopedics, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
| | - JIAQI BI
- Department of Orthopedic Surgery, The First Hospital of Harbin City, Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - YONG CHENG
- Department of Orthopedic Surgery, The First Hospital of Harbin City, Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - ZHIWEI QU
- Department of Orthopedic Surgery, The First Hospital of Harbin City, Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
- Correspondence to: Professor Zhiwei Qu, Department of Orthopaedic Surgery, The First Hospital of Harbin City, Harbin Medical University, 149 Mai Mai Street, Daoli, Harbin, Heilongjiang 150001, P.R. China, E-mail:
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D’Alessandria C, Pohle K, Rechenmacher F, Neubauer S, Notni J, Wester HJ, Schwaiger M, Kessler H, Beer AJ. In vivo biokinetic and metabolic characterization of the 68Ga-labelled α5β1-selective peptidomimetic FR366. Eur J Nucl Med Mol Imaging 2015; 43:953-963. [DOI: 10.1007/s00259-015-3218-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 10/06/2015] [Indexed: 01/04/2023]
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Phillips E, Penate-Medina O, Zanzonico PB, Carvajal RD, Mohan P, Ye Y, Humm J, Gönen M, Kalaigian H, Schöder H, Strauss HW, Larson SM, Wiesner U, Bradbury MS. Clinical translation of an ultrasmall inorganic optical-PET imaging nanoparticle probe. Sci Transl Med 2014; 6:260ra149. [PMID: 25355699 DOI: 10.1126/scitranslmed.3009524] [Citation(s) in RCA: 468] [Impact Index Per Article: 46.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A first-in-human clinical trial of ultrasmall inorganic hybrid nanoparticles, "C dots" (Cornell dots), in patients with metastatic melanoma is described for the imaging of cancer. These renally excreted silica particles were labeled with (124)I for positron emission tomography (PET) imaging and modified with cRGDY peptides for molecular targeting. (124)I-cRGDY-PEG-C dot particles are inherently fluorescent, containing the dye, Cy5, so they may be used as hybrid PET-optical imaging agents for lesion detection, cancer staging, and treatment management in humans. However, the clinical translation of nanoparticle probes, including quantum dots, has not kept pace with the accelerated growth in minimally invasive surgical tools that rely on optical imaging agents. The safety, pharmacokinetics, clearance properties, and radiation dosimetry of (124)I-cRGDY-PEG-C dots were assessed by serial PET and computerized tomography after intravenous administration in patients. Metabolic profiles and laboratory tests of blood and urine specimens, obtained before and after particle injection, were monitored over a 2-week interval. Findings are consistent with a well-tolerated inorganic particle tracer exhibiting in vivo stability and distinct, reproducible pharmacokinetic signatures defined by renal excretion. No toxic or adverse events attributable to the particles were observed. Coupled with preferential uptake and localization of the probe at sites of disease, these first-in-human results suggest safe use of these particles in human cancer diagnostics.
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Affiliation(s)
- Evan Phillips
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Oula Penate-Medina
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Pat B Zanzonico
- Department of Medical Physics, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Richard D Carvajal
- Department of Medicine, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Pauliah Mohan
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Yunpeng Ye
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - John Humm
- Department of Medical Physics, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Mithat Gönen
- Department of Epidemiology and Biostatistics, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Hovanes Kalaigian
- Department of Medical Physics, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Heiko Schöder
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - H William Strauss
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Steven M Larson
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
| | - Ulrich Wiesner
- Department of Materials Science and Engineering, Cornell University, 330 Bard Hall, Ithaca, NY 14853, USA
| | - Michelle S Bradbury
- Department of Radiology, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA.
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Yang Y, Ji S, Liu S. Impact of multiple negative charges on blood clearance and biodistribution characteristics of 99mTc-labeled dimeric cyclic RGD peptides. Bioconjug Chem 2014; 25:1720-9. [PMID: 25144854 PMCID: PMC4166031 DOI: 10.1021/bc500309r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
![]()
This
study sought to evaluate the impact of multiple negative charges
on blood clearance kinetics and biodistribution properties of 99mTc-labeled RGD peptide dimers. Bioconjugates HYNIC-P6G-RGD2 and HYNIC-P6D-RGD2 were prepared by reacting P6G-RGD2 and P6D-RGD2, respectively, with excess HYNIC-OSu
in the presence of diisopropylethylamine. Their IC50 values
were determined to be 31 ± 5 and 41 ± 6 nM, respectively,
against 125I-echistatin bound to U87MG glioma cells in
a whole-cell displacement assay. Complexes [99mTc(HYNIC-P6G-RGD2)(tricine)(TPPTS)] (99mTc-P6G-RGD2)
and [99mTc(HYNIC-P6D-RGD2)(tricine)(TPPTS)]
(99mTc-P6D-RGD2) were prepared in high radiochemical
purity (RCP > 95%) and specific activity (37–110 GBq/μmol).
They were evaluated in athymic nude mice bearing U87MG glioma xenografts
for their biodistribution. The most significant difference between 99mTc-P6D-RGD2 and 99mTc-P6G-RGD2 was their blood radioactivity levels and tumor uptake. The
initial blood radioactivity level for 99mTc-P6D-RGD2 (4.71 ± 1.00%ID/g) was ∼5× higher than that
of 99mTc-P6G-RGD2 (0.88 ± 0.05%ID/g), but
this difference disappeared at 60 min p.i. 99mTc-P6D-RGD2 had much lower tumor uptake (2.20–3.11%ID/g) than 99mTc-P6G-RGD2 (7.82–9.27%ID/g) over a 2
h period. Since HYNIC-P6D-RGD2 and HYNIC-P6G-RGD2 shared a similar integrin αvβ3 binding affinity (41 ± 6 nM versus 31 ± 5 nM), the difference
in their blood activity and tumor uptake is most likely related to
the nine negative charges and high protein binding of 99mTc-P6D-RGD2. Despite its low uptake in U87MG tumors, the
tumor uptake of 99mTc-P6D-RGD2 was integrin
αvβ3-specific. SPECT/CT studies
were performed using 99mTc-P6G-RGD2 in athymic
nude mice bearing U87MG glioma and MDA-MB-231 breast cancer xenografts.
The SPECT/CT data demonstrated the tumor-targeting capability of 99mTc-P6G-RGD2, and its tumor uptake depends on
the integrin αvβ3 expression levels
on tumor cells and neovasculature. It was concluded that the multiple
negative charges have a significant impact on the blood clearance
kinetics and tumor uptake of 99mTc-labeled dimeric cyclic
RGD peptides.
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Affiliation(s)
- Yong Yang
- School of Health Sciences, Purdue University , 550 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
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Kim YS, Li F, Kong R, Bai Y, Li KCP, Fan Y, O'Neill BE, Li Z. Multivalency of non-peptide integrin αVβ3 antagonist slows tumor growth. Mol Pharm 2013; 10:3603-11. [PMID: 23961901 DOI: 10.1021/mp400096z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Multivalency is a powerful strategy for achieving high-affinity molecular binding of compounds to increase their therapeutic potency or imaging potential. In our study, multivalent non-peptide integrin αvβ3 antagonists (IA) were designed for antitumor therapy. Docking and molecular dynamics were employed to explore the binding modes of IA monomer, dimer, and trimer. In silico, one IA unit binds tightly in the active site with similar pose to native ligand RGD and other parts of dimer and trimer contribute extra binding affinities by interacting with residues in vicinity of the original site. In vitro studies demonstrated that increasing valency results in increasing antiproliferative and antiorganizational effects against endothelial cells (HUVECs), and a much weaker effect on melanoma B16F10 cells. The antitumor efficacies of the IA multivalent compounds were evaluated in subcutaneous B16F10 melanoma tumor-bearing mice. At 30 mg/kg dose, the mean masses of tumors harvested 18 days after inoculation were significantly reduced (p<10(-7)) by 36±9%, 49±8%, and 71±7% for the IA monomer, dimer, and trimer groups, relative to control. The importance of multivalency was demonstrated to be highly significant beyond the additive effect of the extra pharmacological sites (p=0.00011). These results suggest that the major target of these anti-αvβ3 compounds is the neovasculature rather than the cancer cells, and the success of a multivalent strategy depends on the details of the components and linker. This is the first integrin αvβ3 multivalent ligand showing clear enhancement in antitumor effectiveness.
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Affiliation(s)
- Yoo-Shin Kim
- Department of Translational Imaging,§Department of Systems Medicine & Bioengineering, The Methodist Hospital Research Institute, Weill Medical College of Cornell University , 6670 Bertner Avenue, Houston, Texas 77030, United States
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Jang BS, Park SH, Shin IS, Maeng JS, Paik CH. Biodistribution of 99mTc Labeled Integrin Antagonist. Toxicol Res 2013; 29:21-5. [PMID: 24278625 PMCID: PMC3834440 DOI: 10.5487/tr.2013.29.1.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Revised: 02/01/2013] [Accepted: 02/05/2013] [Indexed: 11/20/2022] Open
Abstract
The selective targeting of an integrin αvβ3 receptor using radioligands may enable the assessment of angiogenesis and integrin αvβ3 receptor status in tumors. The aim of this research was to label a peptidomimetic integrin αvβ3 antagonist (PIA) with 99mTc(CO)3 and to test its receptor targeting properties in nude mice bearing receptor-positive tumors. PIA was reacted with tris-succinimidyl aminotriacetate (TSAT) (20 mM) as a PIA per TSAT. The product, PIA-aminodiacetic acid (ADA), was radiolabeled with [99mTc(CO)3(H2O)3]+1, and purified sequentially on a Sep-Pak C-18 cartridge followed by a Sep-Pak QMA anion exchange cartridge. Using gradient C-18 reverse-phase HPLC, the radiochemical purity of 99mTc(CO)3-ADA-PIA (retention time, 10.5 min) was confirmed to be > 95%. Biodistribution analysis was performed in nude mice (n = 5 per time point) bearing receptor-positive M21 human melanoma xenografts. The mice were administered 99mTc(CO)3-ADA-PIA intravenously. The animals were euthanized at 0.33, 1, and 2 hr after injection for the biodistribution study. A separate group of mice were also co-injected with 200 μg of PIA and euthanized at 1 hr to quantify tumor uptake. 99mTc(CO)3-ADA-PIA was stable in phosphate buffer for 21 hr, but at 3 and 6 hr, 7.9 and 11.5% of the radioactivity was lost as histidine, respectively. In tumor bearing mice, 99mTc(CO)3-ADA-PIA accumulated rapidly in a receptor-positive tumor with a peak uptake at 20 min, and rapid clearance from blood occurring primarily through the hepatobiliary system. At 20 min, the tumor-toblood ratio was 1.8. At 1 hr, the tumor uptake was 0.47% injected dose (ID)/g, but decreased to 0.12% ID/g when co-injected with an excess amount of PIA, indicating that accumulation was receptor mediated. These results demonstrate successful 99mTc labeling of a peptidomimetic integrin antagonist that accumulated in a tumor via receptor-specific binding. However, tumor uptake was very low because of low blood concentrations that likely resulted from rapid uptake of the agent into the hepatobiliary system. This study suggests that for 99mTc(CO)3-ADA-PIA to be useful as a tumor detection agent, it will be necessary to improve receptor binding affinity and increase the hydrophilicity of the product to minimize rapid hepatobiliary uptake.
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Affiliation(s)
- Beom-Su Jang
- RI-Biomics Research & Development Team, Korea Atomic Energy Research Institute, Jeonbuk, Korea
- Nuclear Medicine Department and Radiology Department, Warren G. Magnuson Clinical Center, NIH, Bethesda, MD 20892, USA
| | - Seung-Hee Park
- Nuclear Medicine Department and Radiology Department, Warren G. Magnuson Clinical Center, NIH, Bethesda, MD 20892, USA
| | - In Soo Shin
- Division of Biologics Research, Korea Food and Drug Administration, Osong, Chungbuk, Korea
| | - Jin-Soo Maeng
- Bio-nanotechnology Research Center, Korea Food Research Institute, Sungnam, Korea
| | - Chang H. Paik
- Nuclear Medicine Department and Radiology Department, Warren G. Magnuson Clinical Center, NIH, Bethesda, MD 20892, USA
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Varshney R, Hazari PP, Fernandez P, Schulz J, Allard M, Mishra AK. (68)Ga-labeled bombesin analogs for receptor-mediated imaging. Recent Results Cancer Res 2013; 194:221-256. [PMID: 22918762 DOI: 10.1007/978-3-642-27994-2_12] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Targeted receptor-mediated imaging techniques have become crucial tools in present targeted diagnosis and radiotherapy as they provide accurate and specific diagnosis of disease information. Peptide-based pharmaceuticals are gaining popularity, and there has been vast interest in developing (68)Ga-labeled bombesin (Bn) analogs. The gastrin-releasing peptide (GRP) family and its Bn analog have been implicated in the biology of several human cancers. The three bombesin receptors GRP, NMB, and BRS-3 receptor are most frequently ectopically expressed by common, important malignancies. The low expression of Bn/GRP receptors in normal tissue and relatively high expression in a variety of human tumors can be of biological importance and form a molecular basis for Bn/GRP receptor-mediated imaging. To develop a Bn-like peptide with favorable tumor targeting and pharmacokinetic characteristics for possible clinical use, several modifications in the Bn-like peptides, such as the use of a variety of chelating agents, i.e., acyclic and macrocyclic agents with different spacer groups and with different metal ions (gallium), have been performed in recent years without significant disturbance of the vital binding scaffold. The favorable physical properties of (68)Ga, i.e., short half-life, and the fast localization of small peptides make this an ideal combination to study receptor-mediated imaging in patients.
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Shen Y, Schottelius M, Zelenka K, De Simone M, Pohle K, Kessler H, Wester HJ, Schmutz P, Alberto R. Orthogonally protected artificial amino acid as tripod ligand for automated peptide synthesis and labeling with [(99m)Tc(OH(2))(3)(CO)(3)](+). Bioconjug Chem 2012; 24:26-35. [PMID: 23237229 DOI: 10.1021/bc3003327] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
1,2-Diamino-propionic acid (Dap) is a very strong chelator for the [(99m)Tc(CO)(3)](+) core, yielding small and hydrophilic complexes. We prepared the lysine based Dap derivative l-Lys(Dap) in which the ε-NH(2) group was replaced by the tripod through conjugation to its α-carbon. The synthetic strategy produced an orthogonally protected bifunctional chelator (BFC). The -NH(2) group of the α-amino acid portion is Fmoc- and the -NH(2) of Dap are Boc-protected. Fmoc-l-Lys(Dap(Boc)) was either conjugated to the N- and C-terminus of bombesin BBN(7-14) or integrated into the sequence using solid-phase peptide synthesis (SPPS). We also replaced the native lysine in a cyclic RGD peptide with l-Lys(Dap). For all peptides, quantitative labeling with the [(99m)Tc(CO)(3)](+) core at a 10 μM concentration in PBS buffer (pH = 7.4) was achieved. For comparison, the rhenium homologues were prepared from [Re(OH(2))(3)(CO)(3)](+) and Lys(Dap)-BBN(7-14) or cyclo-(RGDyK(Dap)), respectively. Determination of integrin receptor binding showed low to medium nanomolar affinities for various receptor subtypes. The IC(50) of cyclo-(RGDyK(Dap[Re(CO)(3)])) for α(v)β(3) is 7.1 nM as compared to 3.1 nM for nonligated RGD derivative. Biodistribution studies in M21 melanoma bearing nude mice showed reasonable α(v)β(3)-integrin specific tumor uptake. Altogether, orthogonally protected l-Lys(Dap) represents a highly versatile building block for integration in any peptide sequence. Lys(Dap)-precursors allow high-yield (99m)Tc-labeling with [(99m)Tc(OH(2))(3)(CO)(3)](+), forming small and hydrophilic complexes, which in turn leads to peptide radiopharmaceuticals with excellent in vivo characteristics.
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Affiliation(s)
- Yunjun Shen
- Institute of Inorganic Chemistry, University of Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland
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Zheleznyak A, Wadas TJ, Sherman CD, Wilson JM, Kostenuik PJ, Weilbaecher KN, Anderson CJ. Integrin α(v)β₃ as a PET imaging biomarker for osteoclast number in mouse models of negative and positive osteoclast regulation. Mol Imaging Biol 2012; 14:500-8. [PMID: 21853370 DOI: 10.1007/s11307-011-0512-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE The goal of this study was to determine the specificity of ⁶⁴Cu-CB-TE2A-c(RGDyK) (⁶⁴Cu-RGD) for osteoclast-related diseases, such as Paget's disease or rheumatoid arthritis. PROCEDURES C57BL/6 mice were treated systemically with osteoprotegerin (OPG) for 15 days or RANKL for 11 days to suppress and stimulate osteoclastogenesis, respectively. The mice were then imaged by positron emission tomography/computed tomography using ⁶⁴Cu-RGD, followed by determination of serum TRAP5b and bone histology. Standard uptake values were determined to quantify ⁶⁴Cu-RGD in bones and other tissues. RESULTS Mice treated with OPG showed decreased bone uptake of ⁶⁴Cu-RGD at 1, 2, and 24 h post-injection of the tracer (p < 0.01 for all time points) compared to vehicle controls, which correlated with a post-treatment decrease in serum TRAP5b. In contrast, mice treated with RANKL showed significantly increased bone uptake at 2 h post-injection of (⁶⁴Cu-RGD (p < 0.05) compared to the vehicle control group, corresponding to increased serum TRAP5b and OC numbers as determined by bone histology. CONCLUSIONS These data demonstrate that ⁶⁴Cu-RGD localizes to areas in bone with increased osteoclast numbers and support the use of ⁶⁴Cu-RGD as an imaging biomarker for osteoclast number that could be used to monitor osteoclast-related pathologies and their treatments.
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Affiliation(s)
- Alexander Zheleznyak
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO, USA
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Banerjee SR, Pullambhatla M, Shallal H, Lisok A, Mease RC, Pomper MG. A modular strategy to prepare multivalent inhibitors of prostate-specific membrane antigen (PSMA). Oncotarget 2012; 2:1244-53. [PMID: 22207391 PMCID: PMC3282081 DOI: 10.18632/oncotarget.415] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We have developed a modular scaffold for preparing high-affinity, homo-multivalent inhibitors of the prostate-specific membrane antigen (PSMA) for imaging and therapy of prostate cancer (PCa). Our system contains a lysine-based (µ-, e-) dialkyne residue for incorporating a PSMA binding Lys-Glu urea motif exploiting click chemistry and a second lysine residue for subsequent modification with an imaging or therapeutic moiety. The utility of the multivalent scaffold was examined by synthesizing bivalent compounds 2 and 3 and comparing them with the monovalent analog 1. Determination of inhibition constants (Ki) revealed that bivalent 2 (0.2 nM) and 3 (0.08 nM) are significantly more potent (~ 5 fold and ~ 11 fold, respectively) inhibitors of PSMA than monovalent 1 (0.9 nM). A single photon emission computed tomography (SPECT)-CT imaging study of [111In]3 demonstrated high and specific uptake in PSMA+ PC-3 PIP tumor until at least 48 h post-injection, with rapid clearance from non-target tissues, including kidney. A biodistribution study revealed that [111In]3 demonstrated 34.0 ± 7.5 percent injected dose per gram of tissue in PSMA+ tumor at 24 h post-injection and was capable of generating target-to-non-target ratios of ~ 379 in PSMA+ PC-3 PIP tumors vs. isogenic PSMA-negative PC3-flu tumors in vivo. The click chemistry approach affords a convenient strategy toward multivalent PSMA inhibitors of enhanced affinity and superior pharmacokinetics for imaging.
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Affiliation(s)
- Sangeeta Ray Banerjee
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins Medical School, Baltimore, MD, USA
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Shetty D, Jeong JM, Shim H. Stroma targeting nuclear imaging and radiopharmaceuticals. INTERNATIONAL JOURNAL OF MOLECULAR IMAGING 2012; 2012:817682. [PMID: 22685650 PMCID: PMC3364577 DOI: 10.1155/2012/817682] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Accepted: 02/29/2012] [Indexed: 01/27/2023]
Abstract
Malignant transformation of tumor accompanies profound changes in the normal neighboring tissue, called tumor stroma. The tumor stroma provides an environment favoring local tumor growth, invasion, and metastatic spreading. Nuclear imaging (PET/SPECT) measures biochemical and physiologic functions in the human body. In oncology, PET/SPECT is particularly useful for differentiating tumors from postsurgical changes or radiation necrosis, distinguishing benign from malignant lesions, identifying the optimal site for biopsy, staging cancers, and monitoring the response to therapy. Indeed, PET/SPECT is a powerful, proven diagnostic imaging modality that displays information unobtainable through other anatomical imaging, such as CT or MRI. When combined with coregistered CT data, [(18)F]fluorodeoxyglucose ([(18)F]FDG)-PET is particularly useful. However, [(18)F]FDG is not a target-specific PET tracer. This paper will review the tumor microenvironment targeting oncologic imaging such as angiogenesis, invasion, hypoxia, growth, and homing, and also therapeutic radiopharmaceuticals to provide a roadmap for additional applications of tumor imaging and therapy.
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Affiliation(s)
- Dinesh Shetty
- Department of Radiology and Imaging Sciences, Emory University, 1701 Uppergate Drive, C5008, Atlanta, GA 30322, USA
- Winship Cancer Institute, Emory University, Atlanta, GA 30322, USA
| | - Jae-Min Jeong
- Department of Nuclear Medicine, Seoul National University Hospital, Seoul 110744, Republic of Korea
| | - Hyunsuk Shim
- Department of Radiology and Imaging Sciences, Emory University, 1701 Uppergate Drive, C5008, Atlanta, GA 30322, USA
- Winship Cancer Institute, Emory University, Atlanta, GA 30322, USA
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Jacobson O, Zhu L, Niu G, Weiss ID, Szajek LP, Ma Y, Sun X, Yan Y, Kiesewetter DO, Liu S, Chen X. MicroPET imaging of integrin αvβ3 expressing tumors using 89Zr-RGD peptides. Mol Imaging Biol 2012; 13:1224-33. [PMID: 21161690 DOI: 10.1007/s11307-010-0458-y] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
PURPOSE The dimeric transmembrane integrin, α(v)β(3), is a well-investigated target by different imaging modalities through suitably labeled arginine-glycine-aspartic acid (RGD) containing peptides. In this study, we labeled four cyclic RGD peptides with or without PEG functional groups: c(RGDfK) (denoted as FK), PEG(3)-c(RGDfK) (denoted as FK-PEG(3)), E[c(RGDfK)](2) (denoted as [FK](2)), and PEG(4)-E[PEG(4)-c(RGDfK)](2) (denoted as [FK](2)-3PEG(4)), with (89)Zr (t(1/2) = 78.4 h), using the chelator desferrioxamine-p-SCN (Df) for imaging tumor integrin α(v)β(3). METHODS The Df conjugated RGD peptides were subjected to integrin α(v)β(3) binding assay in vitro using MDA-MB-435 breast cancer cells. The (89)Zr-labeled RGD peptides were then subjected to small animal positron emission tomography (PET) and direct tissue sampling biodistribution studies in an orthotopic MDA-MB-435 breast cancer xenograft model. RESULTS All four tracers, (89)Zr-Df-FK, (89)Zr-Df-FK-PEG(3), (89)Zr-Df-[FK](2), and (89)Zr-Df-[FK](2)-3PEG(4), were labeled in high radiochemical yield (89 ± 4%) and high specific activity (4.07-6 MBq/μg). Competitive binding assay with (125)I-echistatin showed that conjugation of the RGD peptides to the Df chelator did not have significant impact on their integrin α(v)β(3) binding affinity and the dimeric peptides were shown to be more potent than the monomers. In agreement with binding results, tumor uptake of (89)Zr-Df-[FK](2) and (89)Zr-Df-[FK](2)-3PEG(4) was significantly higher (4.32 ± 1.73%ID/g and 4.72 ± 0.66%ID/g, respectively, at 2 h post-injection) than the monomers (89)Zr-Df-FK and (89)Zr-Df-FK-PEG(3) (1.97 ± 0.38%ID/g and 1.57 ± 0.49%ID/g, respectively, at 2 h post-injection). Out of the four labeled peptides, (89)Zr-Df-[FK](2)-3PEG(4) gave the highest tumor-to-background ratio (18.21 ± 2.52 at 2 h post-injection and 19.69 ± 3.99 at 4 h post-injection), with the lowest uptake in metabolic organs. Analysis of late time points biodistribution data revealed that the uptake in the tumor was decreased, along with increase in the bone, which implies decomplexation of (89)Zr-Df. CONCLUSION Efficient radiolabeling of peptides with an appropriate chelator such as Df-RGD with (89)Zr was observed. The (89)Zr radiolabeled peptides provided high-quality and high-resolution microPET images in xenograft models. (89)Zr-Df-[FK](2)-3PEG(4) demonstrated the highest tumor-to-background ratio of the compounds tested. Preparation of (89)Zr peptides to take advantage of the longer half-life is unwarranted due to the relatively rapid clearance from the tumor region of peptide tracers prepared for this study and the increased uptake in the bone of transchelated (89)Zr with time (2.0 ± 0.36%ID/g, 24 h post-injection).
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Affiliation(s)
- Orit Jacobson
- Laboratory of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda, MD 20892, USA
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Synthesis and comparative assessment of a labeled RGD peptide bearing two different ⁹⁹mTc-tricarbonyl chelators for potential use as targeted radiopharmaceutical. Bioorg Med Chem 2012; 20:2549-57. [PMID: 22445386 DOI: 10.1016/j.bmc.2012.02.051] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Revised: 02/20/2012] [Accepted: 02/22/2012] [Indexed: 01/26/2023]
Abstract
During the past decade radiolabeled RGD-peptides have been extensively studied to develop site-directed targeting vectors for integrins. Integrins are heterodimeric cell-surface adhesion receptors, which are upregulated in cancer cells and neovasculature during tumor angiogenesis and recognize the RGD aminoacid sequence. In the present study, we report the synthesis and development of two derivatives of the Nε-Lys derivatized cyclic Arg-Gly-Asp-D-Phe-Lys peptide, namely of cRGDfKHis and cRGDfK-CPA (CPA: 3-L-Cysteine Propionic Acid), radiolabeled via the [(99m)Tc(H(2)O)(3)(CO)(3)](+) metal aquaion at a high yield even at low concentrations of 10-5M (>87%) for cRGDfK-10-5M (>93%) for cRGDfK-CPA. Radiolabeled peptides were characterized with regard to their stability in saline, in His/Cys solutions, as well as in plasma, serum and tissue homogenates and were found to be practically stable. Internalization and efflux assays using αvβ3-receptor-positive MDA-MB 435 breast cancer cells showed a good percentage of quick internalization (29.1 ± 9.8% for (99m)Tc-HiscRGDfK and 37.0 ± 0.7% for (99m)Tc-CPA-cRGDfK at 15 min) and no retention of radioactivity for both derivatives. Their in vivo behavior was assessed in normal mice and pathological SCID mice bearing MDA-MB 435 ανβ3 positive breast tumors. Both presented fast blood clearance and elimination via both the urinary and hepatobiliary systems, with (99m)Tc-His-cRGDfK remaining for a longer time than (99m)Tc-CPA-cRGDfK in all organs examined. Tumor uptake 30 min pi was higher for (99m)Tc-CPAcRGDfK (4.2 ± 1.5% ID/g) than for (99m)Tc-His-cRGDfK (2.8 ± 1.5% ID/g). Dynamic scintigraphic studies showed that the tumor could be visualized better between 15 and 45 min pi for both radiolabeled compounds but low delineation occurred due to high abdominal background. It was finally noticed that the accumulated activity on the tumor site was depended on the size of the experimental tumor; the smaller the size, the higher was the radioactivity concentration.
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20
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Benezra M, Penate-Medina O, Zanzonico PB, Schaer D, Ow H, Burns A, DeStanchina E, Longo V, Herz E, Iyer S, Wolchok J, Larson SM, Wiesner U, Bradbury MS. Multimodal silica nanoparticles are effective cancer-targeted probes in a model of human melanoma. J Clin Invest 2011; 121:2768-80. [PMID: 21670497 DOI: 10.1172/jci45600] [Citation(s) in RCA: 429] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Accepted: 05/04/2011] [Indexed: 11/17/2022] Open
Abstract
Nanoparticle-based materials, such as drug delivery vehicles and diagnostic probes, currently under evaluation in oncology clinical trials are largely not tumor selective. To be clinically successful, the next generation of nanoparticle agents should be tumor selective, nontoxic, and exhibit favorable targeting and clearance profiles. Developing probes meeting these criteria is challenging, requiring comprehensive in vivo evaluations. Here, we describe our full characterization of an approximately 7-nm diameter multimodal silica nanoparticle, exhibiting what we believe to be a unique combination of structural, optical, and biological properties. This ultrasmall cancer-selective silica particle was recently approved for a first-in-human clinical trial. Optimized for efficient renal clearance, it concurrently achieved specific tumor targeting. Dye-encapsulating particles, surface functionalized with cyclic arginine-glycine-aspartic acid peptide ligands and radioiodine, exhibited high-affinity/avidity binding, favorable tumor-to-blood residence time ratios, and enhanced tumor-selective accumulation in αvβ3 integrin-expressing melanoma xenografts in mice. Further, the sensitive, real-time detection and imaging of lymphatic drainage patterns, particle clearance rates, nodal metastases, and differential tumor burden in a large-animal model of melanoma highlighted the distinct potential advantage of this multimodal platform for staging metastatic disease in the clinical setting.
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Affiliation(s)
- Miriam Benezra
- Department of Radiology, Sloan-Kettering Institute for Cancer Research,New York, New York 10065, USA
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Aufort M, Gonera M, Lelait MA, Czarny B, Le Clainche L, Thaï R, Landra A, Ruinart de Brimont M, Dugave C. Synthesis, in vitro screening and in vivo evaluation of cyclic RGD analogs cyclized through oxorhenium and oxotechnetium coordination. Eur J Med Chem 2011; 46:1779-88. [PMID: 21392860 DOI: 10.1016/j.ejmech.2011.02.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 02/10/2011] [Accepted: 02/11/2011] [Indexed: 12/13/2022]
Abstract
A library of RGD tripeptide analogs cyclized through oxorhenium coordination by an NS2/S chelation motif was synthesized. Screening towards integrins αVβ3, αIIbβ3 and αVβ5 led to the identification of 6 oxorhenium complexes that bind to integrin αVβ3 in the submicromolar range. In vivo evaluation of five of the corresponding oxotechnetium complexes using nude mice bearing a U87MG human tumor xenograft showed a significant and specific accumulation of radioactivity inside the tumor. The best results in vivo were obtained with complexes Tc-16 and Tc-50 that displayed a higher tumor accumulation and a lower distribution in other tissues relative to a reference cyclopentapeptide tracer.
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Affiliation(s)
- Marie Aufort
- CEA/Saclay, iBiTec-S/SIMOPRO, Bâtiment 152, 91191 Gif-sur-Yvette, France
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22
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Huang B, Desai A, Tang S, Thomas TP, Baker JR. The synthesis of a c(RGDyK) targeted SN38 prodrug with an indolequinone structure for bioreductive drug release. Org Lett 2010; 12:1384-7. [PMID: 20192275 DOI: 10.1021/ol1002626] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Preparation of a novel c(RGDyK) targeted SN38 prodrug incorporating an indolequinone structure for bioreductively triggered drug release is described. This design yields a prodrug that targets surface molecules on tumor cells (alpha(v)beta(3) integrins) and releases drug under bioreductive conditions. There are three moieties in the prodrug design, namely a therapeutic drug SN38, an indolequinone structure serving as a drug releasing trigger, and an alpha(v)beta(3) integrin targeting peptide c(RGDyK). Preliminary studies showed that SN38 is released in the presence of a bioreductive enzyme (DT-diaphorase).
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Affiliation(s)
- Baohua Huang
- Michigan Nanotechnology Institute for Medicine and Biological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
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Liu S. Radiolabeled cyclic RGD peptides as integrin alpha(v)beta(3)-targeted radiotracers: maximizing binding affinity via bivalency. Bioconjug Chem 2010; 20:2199-213. [PMID: 19719118 DOI: 10.1021/bc900167c] [Citation(s) in RCA: 279] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Integrin alpha(v)beta(3) plays a significant role in tumor angiogenesis and is a receptor for the extracellular matrix proteins with the exposed arginine-glycine-aspartic (RGD) tripeptide sequence. These include vitronectin, fibronectin, fibrinogen, lamin, collagen, Von Willibrand's factor, osteoponin, and adenovirus particles. Integrin alpha(v)beta(3) is expressed at low levels on epithelial cells and mature endothelial cells, but it is overexpressed on the activated endothelial cells of tumor neovasculature and some tumor cells. The restricted expression of integrin alpha(v)beta(3) during tumor growth, invasion, and metastasis presents an interesting molecular target for both early detection and treatment of rapidly growing solid tumors. Over the past decade, many radiolabeled linear and cyclic RGD peptide antagonists have been evaluated as integrin alpha(v)beta(3)-targeted radiotracers. Significant progress has been made on their use for imaging integrin alpha(v)beta(3)-positive tumors by SPECT or PET. Among the radiotracers evaluated in preclinical tumor-bearing models, [18F]Galacto-RGD (2-[18F]fluoropropanamide c(RGDfK(SAA); SAA = 7-amino-L-glyero-L-galacto-2,6-anhydro-7-deoxyheptanamide) and [18F]-AH111585 are currently under clinical investigation for visualization of integrin alpha(v)beta(3) expression in cancer patients. However, their low tumor uptake, high cost, and lack of preparative modules for routine radiosynthesis will limit their continued clinical application. Thus, there is a continuing need for more efficient integrin alpha(v)beta(3)-targeted radiotracers that are readily prepared from a kit formulation without further postlabeling purification. This article will focus on different approaches to maximize the targeting capability of cyclic RGD peptides and to improve the radiotracer excretion kinetics from noncancerous organs. Improvement of tumor uptake and tumor-to-background ratios is important for early detection of integrin alpha(v)beta(3)-positive tumors and/or noninvasive monitoring of therapeutic efficacy of antiangiogenic therapy.
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Affiliation(s)
- Shuang Liu
- School of Health Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, Indiana 47907, USA.
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Shi J, Kim YS, Chakraborty S, Jia B, Wang F, Liu S. 2-Mercaptoacetylglycylglycyl (MAG2) as a bifunctional chelator for 99mTc-labeling of cyclic RGD dimers: effect of technetium chelate on tumor uptake and pharmacokinetics. Bioconjug Chem 2009; 20:1559-68. [PMID: 19603780 PMCID: PMC2888811 DOI: 10.1021/bc9001739] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This report describes the synthesis of MAG(2)-PEG(4)-E[c(RGDfK)](2) (MAG(2)-P-RGD(2): MAG(2) = S-benzoylmercaptoacetylglycylglycyl; PEG(4) = 15-amino-4,7,10,13-tetraoxapentadecanoic acid) and MAG(2)-PEG(4)-E[PEG(4)-c(RGDfK)](2) (MAG(2)-3P-RGD(2)), and the evaluation of (99m)TcO(MAG(2)-P-RGD(2)) and (99m)TcO(MAG(2)-3P-RGD(2)) as new radiotracers for tumor imaging in the athymic nude mice bearing U87MG human glioma xenografts. We found that MAG(2) is such an efficient bifunctional chelating agent that (99m)TcO(MAG(2)-P-RGD(2)) and (99m)TcO(MAG(2)-3P-RGD(2)) coul d be prepared in high yield (>90%) with high specific activity (∼5 Ci/μmol) using a kit formulation. (99m)TcO(MAG(2)-P-RGD(2)) and (99m)TcO(MAG(2)-3P-RGD(2)) have very high solution stability in the kit matrix. Biodistribution data in athymic nude mice bearing U87MG human glioma xenografts indicated that replacing the highly charged [(99m)Tc(HYNIC = 6-hydrazinonicotinyl and TPPTS = trisodium triphenylphosphine-3,3',3''-trisulfonate) with smaller (99m)TcO(MAG(2)) resulted in a significant increase in the radiotracer uptake in the tumor and normal organs most likely due to the higher lipophilicity of (99m)TcO(MAG(2)-3P-RGD(2)) (log P = -3.15 ± 0.10) than that for [(99m)Tc(HYNIC-3P-RGD(2))(tricine)(TPPTS)] ((99m)Tc-3P-RGD(2): log P = -3.96 ± 0.05). Even though (99m)TcO(MAG(2)-3P-RGD(2)) has better tumor uptake (15.36 ± 2.17 %ID/g at 60 min postinjection (p.i.)) than (99m)Tc-3P-RGD(2) (9.15 ± 2.13 %ID/g at 60 min p.i.), its tumor-to-background (T/B) ratios (tumor/blood = 13.52 ± 4.57; tumor/liver = 4.25 ± 0.88; tumor/lung = 3.17 ± 0.60; and tumor/muscle = 8.34 ± 2.34) are not as good as those of (99m)Tc-3P-RGD(2) (tumor/blood = 36.0 ± 11.5; tumor/liver = 5.14 ± 1.46; tumor/lung = 4.36 ± 0.54; and tumor/muscle = 13.70 ± 2.21) at 60 min p.i. On the basis of these results, we believe that (99m)Tc-3P-RGD(2) remains a better radiotracer because of its higher T/B ratios.
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Affiliation(s)
- Jiyun Shi
- School of Health Sciences, Purdue University, IN 47907, USA
- Medical Isotopes Research Center, Peking University, Beijing 100083, China
| | | | | | - Bing Jia
- Medical Isotopes Research Center, Peking University, Beijing 100083, China
| | - Fan Wang
- Medical Isotopes Research Center, Peking University, Beijing 100083, China
| | - Shuang Liu
- School of Health Sciences, Purdue University, IN 47907, USA
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Wei L, Ye Y, Wadas TJ, Lewis JS, Welch MJ, Achilefu S, Anderson CJ. (64)Cu-labeled CB-TE2A and diamsar-conjugated RGD peptide analogs for targeting angiogenesis: comparison of their biological activity. Nucl Med Biol 2009; 36:277-85. [PMID: 19324273 DOI: 10.1016/j.nucmedbio.2008.12.008] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Revised: 11/20/2008] [Accepted: 12/11/2008] [Indexed: 11/18/2022]
Abstract
OBJECTIVES The alpha(v)beta(3) integrin is a cell adhesion molecule known to be involved in stages of angiogenesis and metastasis. In this study, the chelators CB-TE2A and diamsar were conjugated to cyclic RGDyK and RGDfD and the biological properties of (64)Cu-labeled peptides were compared. METHODS CB-TE2A-c(RGDyK) and diamsar-c(RGDfD) were labeled with (64)Cu in 0.1 M NH(4)OAc (pH=8) at 95 degrees C and 25 degrees C, respectively. PET and biodistribution studies were carried out on M21 (alpha(v)beta(3)-positive) and M21L (alpha(v)-negative) melanoma-bearing mice. Binding affinity of the Cu-chelator-RGD peptides to alpha(v)beta(3) integrins was determined by a competitive binding affinity assay. RESULTS Biological studies showed higher concentration of (64)Cu-CB-TE2A-c(RGDyK) in M21 tumor compared to M21L tumor at 1 and 4 h pi. Tumor concentration of (64)Cu-CB-TE2A-c(RGDyK) was higher than that of (64)Cu-diamsar-c(RGDfD). The difference is not due to differing binding affinities, since similar values were obtained for the agents. Compared to (64)Cu-diamsar-c(RGDfD), there is more rapid liver and blood clearance of (64)Cu-CB-TE2A-c(RGDyK), resulting in a lower liver and blood concentration at 24 h pi. Both (64)Cu-labeled RGD peptides show similar binding affinities to alpha(v)beta(3). The differences in their biodistribution properties are likely related to different linkers, charges and lipophilicities. The M21 tumor is clearly visualized with (64)Cu-CB-TE2A-c(RGDyK) by microPET imaging. Administration of c(RGDyK) as a block significantly reduced the tumor concentration; however, the radioactivity background was also decreased by the blocking dose. CONCLUSIONS Both (64)Cu-CB-TE2A-c(RGDyK) and (64)Cu-diamsar-c(RGDfD) are potential candidates for imaging tumor angiogenesis. For diamsar-c(RGDfD), a linker may be needed between the Cu-chelator moiety and the RGD peptide to achieve optimal in vivo tumor concentration and clearance from nontarget organs.
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Affiliation(s)
- Lihui Wei
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA
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Schottelius M, Laufer B, Kessler H, Wester HJ. Ligands for mapping alphavbeta3-integrin expression in vivo. Acc Chem Res 2009; 42:969-80. [PMID: 19489579 DOI: 10.1021/ar800243b] [Citation(s) in RCA: 242] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The alpha(v)beta(3)- and alpha(5)beta(1)-integrins play a key role in angiogenesis, the formation of new vessels in tissues that lack them. By serving as receptors for a variety of extracellular matrix proteins containing an arginine-glycine-aspartic acid (RGD) sequence, these integrins mediate migration of endothelial cells into the basement membrane and regulate their growth, survival, and differentiation. Besides being involved in angiogenesis, the alpha(v)beta(3)-integrin is also presented on tumor cells of various origin, where it is involved in the processes that govern metastasis. Because the alpha(v)beta(3)-integrin is an attractive target for cancer treatment, high-affinity ligands containing the RGD sequence, for example, cyclic pentapeptides, have been developed. They inhibit angiogenesis, induce endothelial apoptosis, decrease tumor growth, and reduce invasiveness and spread of metastasis. This development finally resulted in cyclo(RGDf(NMe)V) (cilengitide), which is a drug for the treatment of glioblastoma (currently in phase III clinical trials). With the growing focus on individualized medicine, clinicians would like to be able to assess the severity of the disease and monitor therapy for each patient. Such measurements would be based on a noninvasive visualization and quantification the alpha(v)beta(3)-integrin expression levels before, during, and after antiangiogenic therapy. A wide spectrum of in vivo imaging probes for the nuclear imaging modalities positron emission tomography (PET) and single-photon emission computed tomography (SPECT), for optical imaging, and for magnetic resonance imaging (MRI) have been developed with these goals in mind. In this Account, we describe the synthesis and preclinical and clinical assessments of dedicated targeting probes. These molecules ideally accumulate selectively and in high concentrations in alpha(v)beta(3)-integrin-expressing tissues, have low uptake and retention in nontarget tissues, and are highly stable against in vivo degradation. [(123)I]cyclo(RGDyV) was the first radiolabeled "imaging analogue" of cilengitide that we evaluated preclinically in detail. Subsequent studies focused on cyclo(RGDfK) and cyclo(RGDyK), which allowed conjugation with various signaling moieties, such as prosthetic groups, bifunctional chelators (DTPA, DOTA, NOTA, TETA, and TE2A for labeling with (111)In or (177)Lu for SPECT and (86)Y, (68)Ga, or (64)Cu for PET), or fluorescent dyes (Cy5.5, cypate). Furthermore, pharmacokinetic modifiers such as carbohydrates, charged amino acids, or PEG analogues were coupled to the peptide core without significantly affecting the binding affinity. Finally, dimers, tetramers, octamers, and polymers and decorated quantum dots with several dozens of peptide units were constructed and investigated. Some of these multimers demonstrated significantly improved affinity (avidity) and targeting efficiency in vivo. Besides peptidic alpha(v)beta(3)-integrin ligands, researchers have investigated radiolabeled antibodies such as Abegrin and used molecular modeling to design small peptidomimetics with improved activity, in vivo stability, and subtype selectivity (e.g., (111)In-TA138). Furthermore, there is an increasing interest in nanoparticles such as nanotubes, quantum dots, or paramagnetic particles coated with cyclic RGD analogues as targeting agents. [(18)F]Galacto-RGD, a glycosylated cyclo(RGDfK) analogue, was the first such substance applied in patients and has been successfully assessed in more than 100 patients so far. Because of modification with carbohydrates, rapid renal excretion, and inherently low background activity in most regions of the body, imaging of alpha(v)beta(3) expression with high tumor/background ratios and high specificity is possible. Other (18)F-labeled RGD analogues recently developed by Siemens and GE Healthcare have entered clinical trials.
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Affiliation(s)
- Margret Schottelius
- Nuklearmedizinische Klinik und Poliklinik, Klinikum rechts der Isar, Technische Universität München, 81675 München, Germany
| | - Burkhardt Laufer
- Center for Integrated Protein Science at the Technische Universität München, Department Chemie, 85747 Garching, Germany
| | - Horst Kessler
- Center for Integrated Protein Science at the Technische Universität München, Department Chemie, 85747 Garching, Germany
| | - Hans-Jürgen Wester
- Nuklearmedizinische Klinik und Poliklinik, Klinikum rechts der Isar, Technische Universität München, 81675 München, Germany
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Schottelius M, Wester HJ. Molecular imaging targeting peptide receptors. Methods 2009; 48:161-77. [DOI: 10.1016/j.ymeth.2009.03.012] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Accepted: 03/11/2009] [Indexed: 02/08/2023] Open
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99mTcO(MAG2-3G3-dimer): a new integrin αvβ3-targeted SPECT radiotracer with high tumor uptake and favorable pharmacokinetics. Eur J Nucl Med Mol Imaging 2009; 36:1874-84. [DOI: 10.1007/s00259-009-1166-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Accepted: 05/01/2009] [Indexed: 11/27/2022]
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Shi J, Kim YS, Zhai S, Liu Z, Chen X, Liu S. Improving tumor uptake and pharmacokinetics of (64)Cu-labeled cyclic RGD peptide dimers with Gly(3) and PEG(4) linkers. Bioconjug Chem 2009; 20:750-9. [PMID: 19320477 PMCID: PMC2676896 DOI: 10.1021/bc800455p] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Radiolabeled cyclic RGD (Arg-Gly-Asp) peptides represent a new class of radiotracers with potential for early tumor detection and noninvasive monitoring of tumor metastasis and therapeutic response in cancer patients. This article describes the synthesis of two cyclic RGD peptide dimer conjugates, DOTA-PEG(4)-E[PEG(4)-c(RGDfK)](2) (DOTA-3PEG(4)-dimer: DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid; PEG(4) = 15-amino-4,7,10,13-tetraoxapentadecanoic acid) and DOTA-G(3)-E[G(3)-c(RGDfK)](2) (DOTA-3G(3)-dimer: G(3) = Gly-Gly-Gly). Integrin alpha(v)beta(3) binding affinities of cyclic RGD peptides were determined by competitive displacement of (125)I-echistatin bound to U87MG human glioma cells and follow the order of DOTA-E{E[c(RGDfK)](2)}(2) (DOTA-tetramer: IC(50) = 10 +/- 2 nM) > DOTA-3G(3)-dimer (IC(50) = 62 +/- 6 nM) approximately DOTA-3PEG(4)-dimer (IC(50) = 74 +/- 3 nM) > DOTA-E[c(RGDfK)](2) (DOTA-dimer: IC(50) = 102 +/- 5 nM). The addition of PEG(4) and G(3) linkers between two cyclic RGD motifs in DOTA-3G(3)-dimer and DOTA-3PEG(4)-dimer makes it possible for them to achieve the simultaneous integrin alpha(v)beta(3) binding in a bivalent fashion. Both (64)Cu(DOTA-3PEG(4)-dimer) and (64)Cu(DOTA-3G(3)-dimer) were prepared in high yield with specific activity being >50 Ci/mmol. Biodistribution and imaging studies were performed in athymic nude mice bearing U87MG human glioma xenografts. The results from those studies show that PEG(4) and G(3) linkers are particularly useful for improving tumor uptake and clearance kinetics of (64)Cu radiotracers from the nontumor organs, such as kidneys, liver, and lungs. There is a linear relationship between the tumor size and %ID tumor uptake, suggesting that (64)Cu(DOTA-3PEG(4)-dimer) and (64)Cu(DOTA-3PEG(4)-dimer) might be useful for noninvasive monitoring of tumor growth or shrinkage during antiangiogenic therapy. MicroPET imaging data clearly demonstrate the utility of (64)Cu(DOTA-3G(3)-dimer) as a new PET radiotracer for imaging integrin alpha(v)beta(3)-positive tumors.
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Affiliation(s)
- Jiyun Shi
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Young-Seung Kim
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Shizhen Zhai
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Zhaofei Liu
- Molecular Imaging Program at Stanford (MIPS), Department of Radiology & Bio-X, Stanford University, Stanford, CA 94305-5484, USA
| | - Xiaoyuan Chen
- Molecular Imaging Program at Stanford (MIPS), Department of Radiology & Bio-X, Stanford University, Stanford, CA 94305-5484, USA
| | - Shuang Liu
- School of Health Sciences, Purdue University, West Lafayette, IN 47907, USA
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Wang L, Shi J, Kim YS, Zhai S, Jia B, Zhao H, Liu Z, Wang F, Chen X, Liu S. Improving tumor-targeting capability and pharmacokinetics of (99m)Tc-labeled cyclic RGD dimers with PEG(4) linkers. Mol Pharm 2009; 6:231-45. [PMID: 19067525 PMCID: PMC2634825 DOI: 10.1021/mp800150r] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This report describes the synthesis of two cyclic RGD (Arg-Gly-Asp) conjugates, HYNIC-2PEG(4)-dimer (HYNIC = 6-hydrazinonicotinyl; 2PEG(4)-dimer = E[PEG(4)-c(RGDfK)](2); and PEG(4) = 15-amino-4,7,10,13-tetraoxapentadecanoic acid) and HYNIC-3PEG(4)-dimer (3PEG(4)-dimer = PEG(4)-E[PEG(4)-c(RGDfK)](2)), and evaluation of their (99m)Tc complexes [(99m)Tc(HYNIC-2PEG(4)-dimer)(tricine)(TPPTS)] ((99m)Tc-2PEG(4)-dimer: TPPTS = trisodium triphenylphosphine-3,3',3''-trisulfonate) and [(99m)Tc(HYNIC-3PEG(4)-dimer)(tricine)(TPPTS)] ((99m)Tc-3PEG(4)-dimer) as novel radiotracers for imaging integrin alpha(v)beta(3) expression in athymic nude mice bearing U87MG glioma and MDA-MB-435 breast cancer xenografts. The integrin alpha(v)beta(3) binding affinities of RGD peptides were determined by competitive displacement of (125)I-c(RGDyK) on U87MG glioma cells. It was found that the two PEG(4) linkers between RGD motifs in HYNIC-2PEG(4)-dimer (IC(50) = 2.8 +/- 0.5 nM) and HYNIC-3PEG(4)-dimer (IC(50) = 2.4 +/- 0.7 nM) are responsible for their higher integrin alpha(v)beta(3) binding affinity than that of HYNIC-PEG(4)-dimer (PEG(4)-dimer = PEG(4)-E[c(RGDfK)](2); IC(50) = 7.5 +/- 2.3 nM). Addition of extra PEG(4) linker in HYNIC-3PEG(4)-dimer has little impact on integrin alpha(v)beta(3) binding affinity. (99m)Tc-2PEG(4)-dimer and (99m)Tc-3PEG(4)-dimer were prepared in high yield with >95% radiochemical purity and the specific activity of >10 Ci/mumol. Biodistribution studies clearly demonstrated that PEG(4) linkers are particularly useful for improving the tumor uptake and clearance kinetics of (99m)Tc-2PEG(4)-dimer and (99m)Tc-3PEG(4)-dimer from noncancerous organs. It was also found that there was a linear relationship between the tumor size and radiotracer tumor uptake expressed as %ID (percentage of the injected dose) in U87MG glioma and MDA-MB-435 breast tumor models. The blocking experiment showed that the tumor uptake of (99m)Tc-2PEG(4)-dimer is integrin alpha(v)beta(3)-mediated. In the metabolism study, (99m)Tc-2PEG(4)-dimer had high metabolic stability during its excretion from renal and hepatobiliary routes. (99m)Tc-3PEG(4)-dimer also remained intact during thee excretion from the renal route, but, had approximately 30% metabolism during the excretion from the hepatobiliary route. Planar imaging studies in U87MG glioma and MDA-MB-435 breast tumor models showed that the tumors of approximately 5 mm in diameter could be readily visualized with excellent contrast. Thus, (99m)Tc-3PEG(4)-dimer is a very promising radiotracer for the early detection of integrin alpha(v)beta(3)-positive tumors, and may have the potential for noninvasive monitoring of tumor growth or treatment efficacy.
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Affiliation(s)
- Lijun Wang
- School of Health Sciences, Purdue University, IN 47907, USA
| | - Jiyun Shi
- School of Health Sciences, Purdue University, IN 47907, USA
| | | | - Shizhen Zhai
- School of Health Sciences, Purdue University, IN 47907, USA
| | - Bing Jia
- Medical Isotopes Research Center, Peking University, Beijing 100083, China
| | - Huiyun Zhao
- Medical Isotopes Research Center, Peking University, Beijing 100083, China
| | - Zhaofei Liu
- Molecular Imaging Program at Stanford, Department of Radiology & Bio-X, Stanford University, Stanford, California, USA
| | - Fan Wang
- Medical Isotopes Research Center, Peking University, Beijing 100083, China
| | - Xiaoyuan Chen
- Molecular Imaging Program at Stanford, Department of Radiology & Bio-X, Stanford University, Stanford, California, USA
| | - Shuang Liu
- School of Health Sciences, Purdue University, IN 47907, USA
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Shi J, Wang L, Kim YS, Zhai S, Liu Z, Chen X, Liu S. Improving tumor uptake and excretion kinetics of 99mTc-labeled cyclic arginine-glycine-aspartic (RGD) dimers with triglycine linkers. J Med Chem 2008; 51:7980-90. [PMID: 19049428 PMCID: PMC2626178 DOI: 10.1021/jm801134k] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This report describes the synthesis of two new cyclic RGD (Arg-Gly-Asp) dimers, 3 (E[G(3)-c(RGDfK)](2)) and 4 (G(3)-E[G(3)-c(RGDfK)](2)), and their corresponding conjugates 5 (HYNIC-E[G(3)-c(RGDfK)](2): HYNIC = 6-(2-(2-sulfonatobenzaldehyde)hydrazono)nicotinyl) and 6 (HYNIC-G(3)-E[G(3)-c(RGDfK)](2)). Integrin alpha(v)beta(3) binding affinities of 5 and 6 were determined by displacement of (125)I-echistatin bound to U87MG glioma cells. (99)(m)Tc complexes 7 ([(99m)Tc(5)(tricine)(TPPTS)]: TPPTS = trisodium triphenylphosphine-3,3',3''-trisulfonate) and 8 ([(99m)Tc(6)(tricine)(TPPTS)]) were prepared in high yield and high specific activity. Biodistribution and imaging studies were performed in athymic nude mice bearing U87MG glioma and MDA-MB-435 breast cancer xenografts. It was found that G(3) linkers are particularly useful for increasing integrin alpha(v)beta(3) binding affinity of cyclic RGD dimers and improving the tumor uptake and clearance kinetic of their (99)(m)Tc radiotracers. Complex 8 is a very promising radiotracer for the early detection of integrin alpha(v)beta(3)-positive tumors and may have the potential for noninvasive monitoring of tumor growth or shrinkage during antiangiogenic treatment.
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Affiliation(s)
- Jiyun Shi
- School of Health Sciences, Purdue University, IN 47907, USA
| | - Lijun Wang
- School of Health Sciences, Purdue University, IN 47907, USA
| | | | - Shizhen Zhai
- School of Health Sciences, Purdue University, IN 47907, USA
| | - Zhaofei Liu
- Molecular Imaging Program at Stanford, Department of Radiology & Bio-X, Stanford University, Stanford, California, USA
| | - Xiaoyuan Chen
- Molecular Imaging Program at Stanford, Department of Radiology & Bio-X, Stanford University, Stanford, California, USA
| | - Shuang Liu
- School of Health Sciences, Purdue University, IN 47907, USA
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Waldeck J, Häger F, Höltke C, Lanckohr C, von Wallbrunn A, Torsello G, Heindel W, Theilmeier G, Schäfers M, Bremer C. Fluorescence Reflectance Imaging of Macrophage-Rich Atherosclerotic Plaques Using an αvβ3 Integrin–Targeted Fluorochrome. J Nucl Med 2008; 49:1845-51. [DOI: 10.2967/jnumed.108.052514] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Wang J, Kim YS, Liu S. 99mTc-labeling of HYNIC-conjugated cyclic RGDfK dimer and tetramer using EDDA as coligand. Bioconjug Chem 2008; 19:634-42. [PMID: 18281926 DOI: 10.1021/bc7004208] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, EDDA (ethylenediamine- N, N'-diacetic acid) was used as the coligand for 99mTc-labeling of cyclic RGDfK conjugates: HYNIC-dimer (HYNIC = 6-hydrazinonicotinamide; dimer = E[c(RGDfK)]2) and HYNIC-tetramer (tetramer = E{E[c(RGDfK)]2}2). First, HYNIC-dimer was allowed to react with 99mTcO4 (-) in the presence of excess tricine and stannous chloride to form the intermediate complex [99mTc(HYNIC-dimer)(tricine)2], which was then allowed to react with EDDA to afford [99mTc(HYNIC-dimer)(EDDA)] with high yield (>90%) and high specific activity ( approximately 8.0 Ci/micromol). Under the same radiolabeling conditions, the yield for [99mTc(HYNIC-tetramer)(EDDA)] was always <65%. The results from a mixed-ligand experiment show that there is only one EDDA bonding to the 99mTc-HYNIC core in [99mTc(HYNIC-dimer)(EDDA)]. The athymic nude mice bearing subcutaneous U87MG human glioma xenografts were used to evaluate the impact of EDDA coligand on the biodistribution characteristics and excretion kinetics of the 99mTc-labeled HYNIC-dimer and HYNIC-tetramer. Surprisingly, [99mTc(HYNIC-dimer)(EDDA)] and [99mTc(HYNIC-tetramer)(EDDA)] had almost identical tumor uptake over the 2 h period. The use of EDDA as coligand to replace tricine/TPPTS (TPPTS = trisodium triphenylphosphine-3,3',3''-trisulfonate) did not significantly change the uptake of the 99mTc-labeled HYNIC-dimer in noncancerous organs, such as the liver, kidneys, and lungs; but it did result in a significantly lower kidney uptake for the 99mTc-labeled HYNIC-tetramer due to faster renal excretion. It was also found that the radiotracer tumor uptake decreases in a linear fashion as the tumor size increases. The smaller the tumors are, the higher the tumor uptake is regardless of the identity of radiotracer.
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Affiliation(s)
- Jianjun Wang
- School of Health Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, USA
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Abstract
Great efforts are being made to develop antiangiogenesis drugs for treatment of cancer as well as other diseases. Some of the compounds are already in clinical trials. Imaging techniques allowing noninvasive monitoring of corresponding molecular processes can provide helpful information for planning and controlling corresponding therapeutic approaches but will also be of interest for basic science. Current nuclear medicine techniques focus on the development of tracer targeting the vascular endothelial growth factor (VEGF) system, matrix metalloproteinases (MMP), the ED-B domain of a fibronectin isoform, and the integrin alphavbeta3. In this chapter, the recent tracer developments as well as the preclinical and the clinical evaluations are summarized and the potential of the different approaches to characterize angiogenesis are discussed.
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Affiliation(s)
- Roland Haubner
- Universitätsklinik für Nuklearmedizin, Medizinische Universität Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria.
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Haubner R. Noninvasive Determination of Angiogenesis. Cancer Imaging 2008. [DOI: 10.1016/b978-012374212-4.50092-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Jang BS, Lim E, Hee Park S, Shin IS, Danthi SN, Hwang IS, Le N, Yu S, Xie J, Li KCP, Carrasquillo JA, Paik CH. Radiolabeled high affinity peptidomimetic antagonist selectively targets alpha(v)beta(3) receptor-positive tumor in mice. Nucl Med Biol 2007; 34:363-70. [PMID: 17499725 DOI: 10.1016/j.nucmedbio.2007.02.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2006] [Revised: 02/08/2007] [Accepted: 02/11/2007] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The aim of this research was to synthesize radiolabeled peptidomimetic integrin alpha(v)beta(3) antagonists that selectively target integrin alpha(v)beta(3) receptor and clear rapidly from the whole body. METHODS Integrin alpha(v)beta(3) antagonists, 4-[2-(3,4,5,6-tetrahydropyrimidine-2-ylamino)ethyloxy]benzoyl-2-(S)-aminoethylsulfonyl-amino-beta-alanine (IA) and 4-[2-(3,4,5,6-tetrahydro-pyrimidin-2-ylamino)-ethyloxy]benzoyl-2-(S)-[N-(3-amino-neopenta-1-carbamyl)]-aminoethylsulfonylamino-beta-alanine hydrochloride (IAC), a hydrophobic carbamate derivative of IA, were conjugated with 2-p-isothiocyanatobenzyl-DOTA at the amino terminus and labeled with (111)In. The (111)In labeled IA and IAC were subjected to in vitro receptor binding, biodistribution and imaging studies using nude mice bearing the receptor-positive M21 human melanoma xenografts. RESULTS The (111)In-labeled IA (40%) and -IAC (72%) specifically bound in vitro to alpha(v)beta(3) (0.8 microM) at a molar excess. This receptor binding was completely blocked by a molar excess of cold IA to alpha(v)beta(3). The higher receptor-binding affinity of the (111)In-labeled IAC was reflected in higher tumor uptake and retention: 5.6+/-1.4 and 4.5+/-0.7 %ID/g vs. 3.8+/-0.9 and 2.0+/-0.3 %ID/g for the (111)In-labeled IA at 0.33 and 2 h. The tumor uptakes were inhibited by the co-injection of 200 microg of IA, indicating that the uptake was receptor mediated. These antagonists were excreted primarily via the renal system. The (111)In activity retained in the whole body was quite comparable between the (111)In-labeled IA (24% ID) and the (111)In-labeled IAC (33% ID) at 2 h. The higher peak tumor uptake and longer retention resulted in higher tumor-to-background ratios for the (111)In-labeled IAC at 2 h with 9.7, 2.3, 0.8, 1.9, 7.1, 2.2, 0.9, 3.7 and 9.9 for blood, liver, kidney, lung, heart, stomach, intestine, bone and muscle, respectively. The imaging studies with the (111)In-labeled IAC also clearly visualized the receptor-positive tumor at 4 h. CONCLUSIONS The (111)In-labeled IAC showed an improve tumor targeting kinetics with rapid accumulation and prolonged retention in the alpha(v)beta(3) receptor-positive tumor. This together with the rapid whole-body clearance pharmacokinetics warrants further studies on this IAC analog for molecular imaging of tumor-induced angiogenic vessels and various malignant human tumors expressing the receptor.
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Affiliation(s)
- Beom-Su Jang
- Department of Nuclear Medicine, Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, MD 20892, USA
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Jin ZH, Josserand V, Foillard S, Boturyn D, Dumy P, Favrot MC, Coll JL. In vivo optical imaging of integrin alphaV-beta3 in mice using multivalent or monovalent cRGD targeting vectors. Mol Cancer 2007; 6:41. [PMID: 17565663 PMCID: PMC1906830 DOI: 10.1186/1476-4598-6-41] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2007] [Accepted: 06/12/2007] [Indexed: 11/20/2022] Open
Abstract
Background The cRGD peptide is a promising probe for early non-invasive detection of tumors. This study aimed to demonstrate how RAFT-c(-RGDfK-)4, a molecule allowing a tetrameric presentation of cRGD, improved cRGD-targeting potential using in vivo models of αVβ3-positive or negative tumors. Results We chose the human embryonic kidney cells HEK293(β3) (high levels of αVβ3) or HEK293(β1) (αVβ3-negative but expressing αV and β1) engrafted subcutaneously (s.c.) in mice. Non-invasive in vivo optical imaging demonstrated that as compared to its monomeric cRGD analogue, Cy5-RAFT-c(-RGDfK-)4 injected intravenously had higher uptake, prolonged retention and markedly enhanced contrast in HEK293(β3) than in the HEK293(β1) tumors. Blocking studies further demonstrated the targeting specificity and competitive binding ability of the tetramer. Conclusion In conclusion, we demonstrated that Cy5-RAFT-c(-RGDfK-)4 was indeed binding to the αVβ3 receptor and with an improved activity as compared to its monomeric analog, confirming the interest of using multivalent ligands. Intravenous injection of Cy5-RAFT-c(-RGDfK-)4 in this novel pair of HEK293(β3) and HEK293(β1) tumors, provided tumor/skin ratio above 15. Such an important contrast plus the opportunity to use the HEK293(β1) negative control cell line are major assets for the community of researchers working on the design and amelioration of RGD-targeted vectors or on RGD-antagonists.
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MESH Headings
- Animals
- Binding Sites
- Binding, Competitive
- Biomarkers, Tumor/metabolism
- Disease Models, Animal
- Dose-Response Relationship, Drug
- Female
- Humans
- Injections, Intravenous
- Integrin alphaVbeta3/metabolism
- Kidney Neoplasms/diagnosis
- Kidney Neoplasms/metabolism
- Kidney Neoplasms/pathology
- Mice
- Mice, Nude
- Microscopy, Confocal
- Peptides, Cyclic/administration & dosage
- Peptides, Cyclic/pharmacokinetics
- Positron-Emission Tomography
- Tissue Distribution
- Tomography, Emission-Computed, Single-Photon
- Tumor Cells, Cultured
- Xenograft Model Antitumor Assays
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Affiliation(s)
- Zhao-Hui Jin
- INSERM, U823, Cibles Diagnostiques ou Thérapeutiques et Vectorisation des Drogues dans le Cancer du Poumon, Institut Albert Bonniot, 38706 La Tronche Cedex, France
- Université Joseph Fourier, 38041 Grenoble Cedex 9, France
| | - Véronique Josserand
- INSERM, U823, Cibles Diagnostiques ou Thérapeutiques et Vectorisation des Drogues dans le Cancer du Poumon, Institut Albert Bonniot, 38706 La Tronche Cedex, France
- Université Joseph Fourier, 38041 Grenoble Cedex 9, France
| | - Stéphanie Foillard
- Université Joseph Fourier, 38041 Grenoble Cedex 9, France
- CNRS, UMR5616, Ingénierie Moléculaire et Chimie des Composés Bio-organiques, LEDSS, 38041 Grenoble Cedex 9, France
| | - Didier Boturyn
- Université Joseph Fourier, 38041 Grenoble Cedex 9, France
- CNRS, UMR5616, Ingénierie Moléculaire et Chimie des Composés Bio-organiques, LEDSS, 38041 Grenoble Cedex 9, France
| | - Pascal Dumy
- Université Joseph Fourier, 38041 Grenoble Cedex 9, France
- CNRS, UMR5616, Ingénierie Moléculaire et Chimie des Composés Bio-organiques, LEDSS, 38041 Grenoble Cedex 9, France
| | - Marie-Christine Favrot
- INSERM, U823, Cibles Diagnostiques ou Thérapeutiques et Vectorisation des Drogues dans le Cancer du Poumon, Institut Albert Bonniot, 38706 La Tronche Cedex, France
- Université Joseph Fourier, 38041 Grenoble Cedex 9, France
| | - Jean-Luc Coll
- INSERM, U823, Cibles Diagnostiques ou Thérapeutiques et Vectorisation des Drogues dans le Cancer du Poumon, Institut Albert Bonniot, 38706 La Tronche Cedex, France
- Université Joseph Fourier, 38041 Grenoble Cedex 9, France
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Haubner R. Alphavbeta3-integrin imaging: a new approach to characterise angiogenesis? Eur J Nucl Med Mol Imaging 2007; 33 Suppl 1:54-63. [PMID: 16791598 DOI: 10.1007/s00259-006-0136-0] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OVERVIEW The field of angiogenesis research is one of the most rapidly growing biomedical disciplines. Great efforts are being made to develop anti-angiogenesis drugs for treatment of cancer as well as non-oncological diseases. Thus, imaging techniques allowing non-invasive monitoring of corresponding molecular processes will be of great interest. One target structure involved in the angiogenic process is the integrin alphavbeta3, which mediates the migration of activated endothelial cells during vessel formation. MATERIALS AND METHODS A variety of radiolabelled RGD peptides have been introduced for monitoring of alphavbeta3 expression using nuclear medicine tracer techniques. OBJECTIVES This review discusses tracer development and highlights some strategies for tracer optimisation. It summarises the preclinical and clinical data and discusses the potential of this class of tracer to characterise angiogenesis.
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Affiliation(s)
- Roland Haubner
- Universitätsklinik für Nuklearmedizin, Medizinische Universität Innsbruck, Anichstrasse 35, 6020, Innsbruck, Austria.
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Li C, Wang W, Wu Q, Ke S, Houston J, Sevick-Muraca E, Dong L, Chow D, Charnsangavej C, Gelovani JG. Dual optical and nuclear imaging in human melanoma xenografts using a single targeted imaging probe. Nucl Med Biol 2006; 33:349-58. [PMID: 16631083 DOI: 10.1016/j.nucmedbio.2006.01.001] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2005] [Revised: 01/02/2006] [Accepted: 01/03/2006] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Dual-labeled imaging agents that allow both nuclear and optical imaging after a single injection would be advantageous in certain applications. In this study, we synthesized and characterized a dual-labeled RGD (Arg-Gly-Asp) peptide and compared nuclear and optical images obtained with this agent. METHODS 111In-DTPA-Lys(IRDye800)-c(KRGDf) composed of both the 111In chelator diethylenetriaminepentaacetic acid (DTPA) and the near-infrared (NIR) fluorescent dye IRDye800 (excitation/emission, 765/792 nm) was synthesized. The probe was characterized with regard to in vitro biological activity and in vivo pharmacokinetics and the ability to target integrin alphavbeta3. Tumors of mice injected with the dual-labeled probe were imaged both by gamma scintigraphy and NIR fluorescence optical camera. RESULTS DTPA-Lys(IRDye800)-c(KRGDf), DTPA-Lys-c(KRGDf) and c(KRGDf) inhibited the adhesion of melanoma M21 cells to vitronectin-coated surface with the similar biological activity. Both 111In-DTPA-Lys(IRDye800)-c(KRGDf) and 111In-DTPA-Lys-c(KRGDf) had significantly higher uptakes in alphavbeta3-positive M21 melanoma than in alphavbeta3-negative M21-L melanoma at 4-48 h after their injection. Side-by-side comparison of images obtained using 111In-DTPA-Lys(IRDye800)-c(KRGDf) revealed that in living mice, both optical imaging and gamma scintigraphy enabled noninvasive detection of the bound probe to alphavbeta3-positive tumors, with optical images providing improved resolution and sensitive detection of the superficial lesions and gamma images providing sensitive detection of deeper structures. CONCLUSION The dual-labeled imaging probe 111In-DTPA-Lys(IRDye800)-c(KRGDf) was found to specifically bind to alphavbeta3 in melanoma tumor cells. Employing both nuclear and optical imaging with a single imaging probe may facilitate translation of NIR fluorescence optical imaging into clinical applications.
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Affiliation(s)
- Chun Li
- Department of Experimental Diagnostic Imaging, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA.
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von Wallbrunn A, Höltke C, Zühlsdorf M, Heindel W, Schäfers M, Bremer C. In vivo imaging of integrin ανβ3 expression using fluorescence-mediated tomography. Eur J Nucl Med Mol Imaging 2006; 34:745-754. [PMID: 17131149 DOI: 10.1007/s00259-006-0269-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2006] [Accepted: 08/15/2006] [Indexed: 10/23/2022]
Abstract
PURPOSE Optical imaging would be desirable for cancer diagnostics since it can potentially resolve relevant oncological target structures in vivo. We therefore synthesised an alpha v beta(3) targeted fluorochrome and imaged tumour xenografts with different alpha v beta(3) expression levels using both planar and tomographic optical imaging methods. METHODS An alpha v beta(3)-targeted RGD peptide was labelled with a cyanine dye (Cy 5.5). Binding of the optical tracer was tested on M21 melanoma (n=5), HT-1080 fibrosarcoma (n=6) and MCF-7 adenocarcinoma (n=5) cells and their tumour xenografts. All optical imaging studies were performed using two-dimensional planar fluorescence reflectance imaging (FRI) technology and three-dimensional fluorescence-mediated tomography (FMT). RESULTS In vitro, the peptide-dye conjugate showed a clear binding affinity to alpha v beta(3)-positive M21 and HT-1080 cells while alpha v beta(3)-negative MCF-7 cells and pre-dosing with the free RGD peptide revealed little to no fluorescence. In vivo, tumour xenografts were clearly visualised by FRI and FMT up to 24 h post injection. FMT allowed quantification of the fluorochrome distribution in deeper tissue sections showing an average fluorochrome concentration of 417.61 +/- 105.82 nM Cy 5.5 (M21), 353.68 +/- 54.02 nM Cy 5.5 (HT-1080) and 262.83 +/- 155.36 nM Cy 5.5 (MCF-7) in the target tissue 60 min after tracer administration. Competition with the free RGD peptide resulted in a reduction in the fluorochrome concentration in M21 tumour tissue (294.35 +/- 84.27 nM). CONCLUSION RGD-Cy 5.5 combined with novel tomographic optical imaging methods allows non-invasive imaging of tumour-associated alpha v beta(3) expression and may thus be a promising strategy for sensitive evaluation of tumour target expression.
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Affiliation(s)
- Angelika von Wallbrunn
- Department of Clinical Radiology, University of Münster, Albert-Schweitzer-Strasse 33, 48129, Münster, Germany
- Interdisciplinary Center for Clinical Research (IZKF Muenster, FG3), University of Münster, Münster, Germany
| | - Carsten Höltke
- Department of Clinical Radiology, University of Münster, Albert-Schweitzer-Strasse 33, 48129, Münster, Germany
- Departments of Nuclear Medicine and Clinical Radiology, University of Münster, Münster, Germany
| | - Michael Zühlsdorf
- Department of Hematology and Oncology, University of Münster, Münster, Germany
| | - Walter Heindel
- Department of Clinical Radiology, University of Münster, Albert-Schweitzer-Strasse 33, 48129, Münster, Germany
| | - Michael Schäfers
- Interdisciplinary Center for Clinical Research (IZKF Muenster, FG3), University of Münster, Münster, Germany
- Department of Nuclear Medicine, University of Münster, Münster, Germany
- Interdisciplinary Center for Clinical Research (IZKF Muenster, ZPG 4b), University of Münster, Münster, Germany
| | - Christoph Bremer
- Department of Clinical Radiology, University of Münster, Albert-Schweitzer-Strasse 33, 48129, Münster, Germany.
- Interdisciplinary Center for Clinical Research (IZKF Muenster, FG3), University of Münster, Münster, Germany.
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Decristoforo C, Faintuch-Linkowski B, Rey A, von Guggenberg E, Rupprich M, Hernandez-Gonzales I, Rodrigo T, Haubner R. [99mTc]HYNIC-RGD for imaging integrin αvβ3 expression. Nucl Med Biol 2006; 33:945-52. [DOI: 10.1016/j.nucmedbio.2006.09.001] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Revised: 08/04/2006] [Accepted: 09/02/2006] [Indexed: 11/26/2022]
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Wang W, McMurray JS, Wu Q, Campbell ML, Li C. Convenient solid-phase synthesis of diethylenetriaminepenta-acetic acid (DTPA)- conjugated cyclic RGD peptide analogues. Cancer Biother Radiopharm 2006; 20:547-56. [PMID: 16248770 DOI: 10.1089/cbr.2005.20.547] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Solid-phase synthesis of radiometal chelator-conjugated peptides can facilitate the creation of radioactive peptide libraries to be utilized in high throughput in vivo screening of targeted nuclear-imaging agents. In this study, a new diethylenetriaminepentaacetic acid (DTPA) derivative, 1-(p-succinamidobenzyl)- DTPA penta-t-butyl ester [DTPA(But)(5)-Bz-NH-SA], and its precursor molecule, 1-(p-aminobenzyl)- DTPA penta-t-butyl ester (DTPA(But)(5)-Bz-NH(2)), were applied to the solid-phase synthesis of DTPA-conjugated cyclic peptides containing the Arg-Gly-Asp (RGD) motif with high efficiency. The resulting conjugates, DTPA-Bz-NH-SA-c(Lys-Arg-Gly-Asp-phe) [DTPA-Bz-NH-SA-c(KRGDf)] and DTPA-Bz-NHc( Glu-Arg-Gly-Asp-phe) [DTPA-Bz-NH-c(KRGDf)], demonstrated similar in vitro biologic activities as their corresponding parent peptides. (111)In-labeled, DTPA-conjugated RGD peptides showed selective binding to integrin alphavbeta3 in human melanoma M21 tumors grown in nude mice. Furthermore, (111)In-DTPABz- NH-c(ERGDf) showed lower retention in the liver and the kidney than (111)In-DTPA-Bz-NH-SAc( KRGDf) did, which contributed to higher target to nontarget ratio for (111)In-DTPA-Bz-NH-c(ERGDf). The method reported here can be extended to the construction of peptide libraries containing DTPA for high throughput in vitro and in vivo screening of molecularly targeted imaging agents.
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Affiliation(s)
- Wei Wang
- Department of Experimental Diagnostic Imaging, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
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Temming K, Schiffelers RM, Molema G, Kok RJ. RGD-based strategies for selective delivery of therapeutics and imaging agents to the tumour vasculature. Drug Resist Updat 2005; 8:381-402. [PMID: 16309948 DOI: 10.1016/j.drup.2005.10.002] [Citation(s) in RCA: 350] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2005] [Revised: 10/27/2005] [Accepted: 10/28/2005] [Indexed: 12/24/2022]
Abstract
During the past decade, RGD-peptides have become a popular tool for the targeting of drugs and imaging agents to alphavbeta3-integrin expressing tumour vasculature. RGD-peptides have been introduced by recombinant means into therapeutic proteins and viruses. Chemical means have been applied to couple RGD-peptides and RGD-mimetics to liposomes, polymers, peptides, small molecule drugs and radiotracers. Some of these products show impressive results in preclinical animal models and a RGD targeted radiotracer has already successfully been tested in humans for the visualization of alphavbeta3-integrin, which demonstrates the feasibility of this approach. This review will summarize the structural requirements for RGD-peptides and RGD-mimetics as ligands for alphavbeta3. We will show how they have been introduced in the various types of constructs by chemical and recombinant techniques. The importance of multivalent RGD-constructs for high affinity binding and internalization will be highlighted. Furthermore the in vitro and in vivo efficacy of RGD-targeted therapeutics and diagnostics reported in recent years will be reviewed.
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Affiliation(s)
- Kai Temming
- Department of Pharmacokinetics and Drug Delivery, Groningen University Institute for Drug Exploration (GUIDE), Antonius Deusinglaan 1, 9713 AV, Groningen, The Netherlands
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Houston JP, Ke S, Wang W, Li C, Sevick-Muraca EM. Quality analysis of in vivo near-infrared fluorescence and conventional gamma images acquired using a dual-labeled tumor-targeting probe. JOURNAL OF BIOMEDICAL OPTICS 2005; 10:054010. [PMID: 16292970 DOI: 10.1117/1.2114748] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The cyclic peptide, cyclopentapeptide cyclo(lys-Arg-Gly-Asp-phe) (c(KRGDf)), which is known to target alpha(v)beta3 integrin, is dual-labeled with a radiotracer, (111)indium, for gamma scintigraphy as well as with a near-infrared dye, IRDye800, for continuous-wave (cw) imaging of alpha(v)beta3 positive human M21 melanoma in xenografts. Twenty-four hours after administration of the dual-labeled peptide at a dose equivalent to 90 microCi of (111)In and 5 nmol of near-infrared (NIR) dye, whole-body gamma scintigraphy and cw imaging was conducted. Image acquisition time was 15 min for the gamma scintigraphy images and 800 ms for the optical images acquired using an NIR sensitive intensified charge-coupled device. The results show that while the target-to-background ratio (TBR) of nuclear and optical imaging were similar for surface regions of interest and consistent with the origin of gamma and NIR radiation from a common targeted peptide, the signal-to-noise ratio (SNR) was significantly higher for optical than nuclear imaging. Furthermore, an analysis of SNR versus contrast showed greater sensitivity of optical over nuclear imaging for the subcutaneous tumor targets. While tomographic reconstructions are necessary to probe TBR, SNR, and contrast for interior tissues, this work demonstrates for the first time the direct comparison of molecular optical and planar nuclear imaging for surface and subsurface cancers.
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Affiliation(s)
- Jessica P Houston
- Texas A&M University, Photon Migration Laboratory, College Station, Texas 77842-3012, USA
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Haubner R, Weber WA, Beer AJ, Vabuliene E, Reim D, Sarbia M, Becker KF, Goebel M, Hein R, Wester HJ, Kessler H, Schwaiger M. Noninvasive visualization of the activated alphavbeta3 integrin in cancer patients by positron emission tomography and [18F]Galacto-RGD. PLoS Med 2005; 2:e70. [PMID: 15783258 PMCID: PMC1069665 DOI: 10.1371/journal.pmed.0020070] [Citation(s) in RCA: 376] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2004] [Accepted: 01/28/2005] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The integrin alphavbeta3 plays an important role in angiogenesis and tumor cell metastasis, and is currently being evaluated as a target for new therapeutic approaches. Several techniques are being studied to enable noninvasive determination of alphavbeta3 expression. We developed [(18)F]Galacto-RGD, a (18)F-labeled glycosylated alphavbeta3 antagonist, allowing monitoring of alphavbeta3 expression with positron emission tomography (PET). METHODS AND FINDINGS Here we show by quantitative analysis of images resulting from a small-animal PET scanner that uptake of [(18)F]Galacto-RGD in the tumor correlates with alphavbeta3 expression subsequently determined by Western blot analyses. Moreover, using the A431 human squamous cell carcinoma model we demonstrate that this approach is sensitive enough to visualize alphavbeta3 expression resulting exclusively from the tumor vasculature. Most important, this study shows, that [(18)F]Galacto-RGD with PET enables noninvasive quantitative assessment of the alphavbeta3 expression pattern on tumor and endothelial cells in patients with malignant tumors. CONCLUSIONS Molecular imaging with [(18)F]Galacto-RGD and PET can provide important information for planning and monitoring anti-angiogenic therapies targeting the alphavbeta3 integrins and can reveal the involvement and role of this integrin in metastatic and angiogenic processes in various diseases.
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Affiliation(s)
- Roland Haubner
- Nuklearmedizinische Klinik und Poliklinik, Technische Universität München, Germany.
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Wang W, Ke S, Wu Q, Charnsangavej C, Gurfinkel M, Gelovani JG, Abbruzzese JL, Sevick-Muraca EM, Li C. Near-Infrared Optical Imaging of Integrin αvβ3in Human Tumor Xenografts. Mol Imaging 2004; 3:343-51. [PMID: 15802051 DOI: 10.1162/15353500200404148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
In vivo optical imaging is potentially useful for evaluating the presence of tumor markers that are targets of molecular medicine. Here we report the synthesis and characterization of integrin alphavbeta3-targeted peptide cyclo(Lys-Arg-Gly-Asp-Phe) [c(KRGDf )] labeled with fluorescence dyes with wavelength spanning from the visible/near infrared (Cy5.5) to the true near infrared (IRDye800) for optical imaging. In vitro, the peptide-dye conjugates bound specifically to tumor cells expressing alphavbeta3. When administered intravenously into mice at a dose of 6 nmol /mouse, the conjugates accumulated in tumors expressing alphavbeta3. The tumor-to-background ratios for human KS1767 Kaposi's sarcoma in mice injected with Cy5.5-c(KRGDf ) and Cy5.5 were 5.5 and 1.5, respectively. Preinjection of c(KRGDf ) blocked the uptake of Cy5.5-c(KRGDf ) in tumors by 89%. In alphavbeta3-positive M21 and alphavbeta3-negative M21-L human melanoma, fluorescence intensity in the tumor of mice injected with IRDye800 - c(KRGDf ) was 2.3 and 1.3 times that in normal tissue, respectively. Dynamic imaging revealed that Cy5.5- c(KRGDf ) was rapidly taken up by KS1767 tumor immediately after bolus injection. The rate of its uptake in the tumor was reduced by preinjection of c(KRGDf ) in an interval time-dependent manner. Our data suggest that near-infrared fluorescence imaging may be applied to the detection of tumors expressing integrin alphavbeta3 and to the assessment of the optimal biological dose and schedule of targeted therapies.
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Affiliation(s)
- Wei Wang
- Department of Experimental Diagnostic Imaging, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
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