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Schreck MV, Burgard C, Schmidtke A, Hierlmeier I, Stemler T, Maus S, Rosar F, Jung M, Speicher A, Ezziddin S, Holland JP, Bartholomä MD. Radiometal Complexes as Pharmacokinetic Modifiers: A Potent 68Ga-Labeled Gastrin-Releasing Peptide Receptor Antagonist Based on the Macrocyclic Metal Chelator NODIA-Me. Mol Pharm 2023; 20:6463-6473. [PMID: 37978936 DOI: 10.1021/acs.molpharmaceut.3c00852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
The gastrin-releasing peptide receptor (GRPr) is overexpressed in various cancer types including prostate and breast carcinomas, making it an attractive target for molecular imaging and therapy. In this work, we designed a novel GRPr antagonistic probe comprising metal chelator NODIA-Me. This 1,4,7-triazacyclononane-based chelator forms positively charged metal complexes due to its neutral methylimidazole arms. Because a positive charge at the N-terminus of GRPr conjugates is responsible for high receptor affinity as exemplified by the current gold standard DOTA-RM2, we investigated if a positively charged radiometal complex can be used as a pharmacokinetic modifier to also produce high-affinity GRPr conjugates. In this respect, the bioconjugate NODIA-Me-Ahx-JMV594 was prepared by a combination of solid-phase peptide synthesis and solution-based reactions in a 94% yield. Radiolabeling provided the 68Ga-labeled conjugate in radiochemical yields of >95% and radiochemical purities of >98% with mean molar activities of Am ∼17 MBq nmol-1. The competitive GRPr affinity of the metal-free and 69/71Ga-labeled conjugate was determined to be IC50 = 0.41 ± 0.06 and 1.45 ± 0.06 nM, respectively. The metal-free GRPr antagonist DOTA-RM2 and its corresponding 69/71Ga complex had IC50 values of 1.42 ± 0.07 and 0.98 ± 0.19 nM, respectively. Small-animal PET imaging of mice bearing GRPr(+) PC-3 tumors revealed high radioactivity accumulation in the tumors and in the pancreas as an organ with high levels of GRPr expression. These findings were corroborated by the corresponding ex vivo biodistribution data, in which the tumors and the pancreas exhibited the highest radioactivity accumulation. By coinjection of an excess of NODIA-Me-Ahx-JMV594, uptake in the tumors and GRPr(+) organs was significantly reduced, confirming specific receptor-mediated uptake. The estrogen receptor-positive tumor of a female breast cancer patient was clearly visualized by PET imaging using 68Ga-labeled NODIA-Me-Ahx-JMV594. To summarize, the positive charge at the N-terminus of the conjugate induced by the Ga(NODIA-Me) complex resulted in high GRPr affinity comparable to that of the potent antagonist DOTA-RM2. The conjugate NODIA-Me-Ahx-JMV594 is a promising probe for imaging of GRPr tumors that warrants further evaluation in larger patient cohorts as well as in combination with other radiometals.
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Affiliation(s)
- Moritz-Valentin Schreck
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Caroline Burgard
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Alexander Schmidtke
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Ina Hierlmeier
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Tobias Stemler
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Stephan Maus
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Florian Rosar
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Martin Jung
- Department of Medical Biochemistry and Molecular Biology, Saarland University, D-66421 Homburg, Germany
| | - Andreas Speicher
- Department of Organic Chemistry, Saarland University, D-66123 Saarbrücken, Germany
| | - Samer Ezziddin
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
| | - Jason P Holland
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Mark D Bartholomä
- Department of Nuclear Medicine, Saarland University-Medical Center, Kirrbergerstrasse, D-66421 Homburg, Germany
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Braun D, Judmann B, Cheng X, Wängler B, Schirrmacher R, Fricker G, Wängler C. Synthesis, Radiolabeling, and In Vitro and In Vivo Characterization of Heterobivalent Peptidic Agents for Bispecific EGFR and Integrin α vβ 3 Targeting. ACS Omega 2023; 8:2793-2807. [PMID: 36687076 PMCID: PMC9850772 DOI: 10.1021/acsomega.2c07484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
Radiolabeled heterobivalent peptidic ligands (HBPLs) are a highly promising compound class for the sensitive and specific visualization of tumors as they often exhibit superior properties compared to their monospecific counterparts and are able to concomitantly or complementarily address different receptor types. The combination of two receptor-specific agents targeting the epidermal growth factor receptor (EGFR) and the integrin αvβ3 in one HBPL would constitute a synergistic combination of binding motifs as these two receptor types are concurrently overexpressed on several human tumor types and are closely associated with disease progression and metastasis. Here, we designed and synthesized two heterobivalent radioligands consisting of the EGFR-specific peptide GE11 and αvβ3-specific cyclic RGD peptides, bearing a (1,4,7-triazacyclononane-4,7-diyl)diacetic acid-1-glutaric acid chelator for efficient radiolabeling and linkers of different lengths between both peptides. Both HBPLs were radiolabeled with 68Ga3+ in high radiochemical yields, purities of 96-99%, and molar activities of 36-88 GBq/μmol. [68Ga]Ga-1 and [68Ga]Ga-2 were evaluated for their log D(7.4) and stability toward degradation by human serum peptidases, showing a high hydrophilicity for both agents of -3.07 ± 0.01 and -3.44 ± 0.08 as well as a high stability toward peptidase degradation in human serum with half-lives of 272 and 237 min, respectively. Further on, the in vitro receptor binding profiles of both HBPLs to the target EGF and integrin αvβ3 receptors were assessed on EGFR-positive A431 and αvβ3-positive U87MG cells. Finally, we investigated the in vivo pharmacokinetics of HBPL [68Ga]Ga-1 by positron emission tomography/computed tomography imaging in A431 tumor-bearing xenograft mice to assess its potential for the receptor-specific visualization of EGFR- and/or αvβ3-expressing tumors. In these experiments, [68Ga]Ga-1 demonstrated a tumor uptake of 2.79 ± 1.66% ID/g, being higher than in all other organs and tissues apart from kidneys and blood at 2 h p.i. Receptor blocking studies revealed the observed tumor uptake to be solely mediated by integrin αvβ3, whereas no contribution of the GE11 peptide sequence to tumor uptake via the EGFR could be determined. Thus, the approach to develop radiolabeled EGFR- and integrin αvβ3-bispecific HBPLs is in general feasible although another peptide lead structure than GE11 should be used as the basis for the EGFR-specific part of the agents.
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Affiliation(s)
- Diana Braun
- Biomedical
Chemistry, Clinic of Radiology and Nuclear Medicine, Medical Faculty
Mannheim, Heidelberg University, 68167 Mannheim, Germany
- Molecular
Imaging and Radiochemistry, Clinic of Radiology and Nuclear Medicine,
Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Benedikt Judmann
- Biomedical
Chemistry, Clinic of Radiology and Nuclear Medicine, Medical Faculty
Mannheim, Heidelberg University, 68167 Mannheim, Germany
- Molecular
Imaging and Radiochemistry, Clinic of Radiology and Nuclear Medicine,
Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Xia Cheng
- Molecular
Imaging and Radiochemistry, Clinic of Radiology and Nuclear Medicine,
Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Björn Wängler
- Molecular
Imaging and Radiochemistry, Clinic of Radiology and Nuclear Medicine,
Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
| | - Ralf Schirrmacher
- Department
of Oncology, Division of Oncological Imaging, University of Alberta, Edmonton, Alberta T6G 1Z2, Canada
| | - Gert Fricker
- Institute
of Pharmacy and Molecular Biotechnology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Carmen Wängler
- Biomedical
Chemistry, Clinic of Radiology and Nuclear Medicine, Medical Faculty
Mannheim, Heidelberg University, 68167 Mannheim, Germany
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Xu H, Wang H, Xu Z, Bian S, Xu Z, Zhang H. The multifaceted roles of peptides in “always-on” near-infrared fluorescent probes for tumor imaging. Bioorg Chem 2022; 129:106182. [DOI: 10.1016/j.bioorg.2022.106182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 09/23/2022] [Accepted: 09/25/2022] [Indexed: 11/20/2022]
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Michalski K, Kemna L, Asberger J, Grosu AL, Meyer PT, Ruf J, Sprave T. Gastrin-Releasing Peptide Receptor Antagonist [ 68Ga]RM2 PET/CT for Staging of Pre-Treated, Metastasized Breast Cancer. Cancers (Basel) 2021; 13:6106. [PMID: 34885214 DOI: 10.3390/cancers13236106] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 11/25/2021] [Accepted: 12/01/2021] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Positron emission tomography (PET)/computed tomography (CT) using the gastrin-releasing peptide receptor antagonist [68Ga]RM2 has shown to be a promising imaging method for primary breast cancer (BC) with positive estrogen receptor (ER) status. This study assessed tumor visualization by [68Ga]RM2 PET/CT in patients with pre-treated ER-positive BC and suspected metastases. METHODS This retrospective pilot study included eight female patients with initial ER-positive, pre-treated BC who underwent [68Ga]RM2 PET/CT. Most of these patients (seven out of eight; 88%) were still being treated with or had received endocrine therapy. [68Ga]RM2 PET/CTs were visually analyzed by two nuclear medicine specialists in consensus. Tumor manifestations were rated qualitatively (i.e., RM2-positive or RM2-negative) and quantitatively using the maximum standardized uptake value (SUVmax). SUVmax values were compared between the two subgroups (RM2-positive vs. RM2-negative). RESULTS Strong RM2 binding was found in all metastatic lesions of six patients (75%), whereas tracer uptake in all metastases of two patients (25%) was rated negative. Mean SUVmax of RM2-positive metastases with the highest SUVmax per patient (in lymph node and bone metastases; 15.8 ± 15.1 range: 3.7-47.8) was higher than mean SUVmax of the RM2-negative metastases with the highest SUVmax per patient (in bone metastases; 1.6 ± 0.1, range 1.5-1.7). CONCLUSIONS Our data suggest that RM2 binding is maintained in the majority of patients with advanced disease stage of pre-treated ER-positive BC. Thus, [68Ga]RM2 PET/CT could support treatment decision in these patients, radiotherapy planning in oligometastatic patients or selection of patients for RM2 radioligand therapy. Further studies with larger patient cohorts are warranted to confirm these findings.
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Lindner S, Rudolf H, Palumbo G, Oos R, Antons M, Hübner R, Bartenstein P, Schirrmacher R, Wängler B, Wängler C. Are heterobivalent GRPR- and VPAC 1R-bispecific radiopeptides suitable for efficient in vivo tumor imaging of prostate carcinomas? Bioorg Med Chem Lett 2021; 48:128241. [PMID: 34217827 DOI: 10.1016/j.bmcl.2021.128241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/20/2021] [Accepted: 06/28/2021] [Indexed: 01/01/2023]
Abstract
Receptor-specific peptides labeled with positron emitters play an important role in the clinical imaging of several malignancies by positron emission tomography (PET). Radiolabeled heterobivalent bispecific peptidic ligands (HBPLs) can target more than one receptor type and by this - besides exhibiting other advantages - increase tumor imaging sensitivity. In the present study, we show the initial in vivo evaluation of the most potent heterobivalent gastrin-releasing peptide receptor (GRPR)- and vasoactive intestinal peptide receptor subtype 1 (VPAC1R)-bispecific radiotracer and determined its tumor visualization potential via PET/CT imaging. For this purpose, the most potent described HBPL was synthesized together with its partly scrambled heterobivalent monospecific homologs and its monovalent counterparts. The agents were efficiently labeled with 68Ga3+ and evaluated in an initial PET/CT tumor imaging study in a human prostate carcinoma (PCa) xenograft rat tumor model established for this purpose. None of the three 68Ga-HBPLs enabled a clear tumor visualization and a considerably higher involvement in receptor-mediated uptake was found for the GRPR-binding part of the molecule than for the VPAC1R-binding one. Of the monovalent radiotracers, only [68Ga]Ga-NODA-GA-PESIN could efficiently delineate the tumor, confirming the results. Thus, this work sets the direction for future developments in the field of GRPR- and VPAC1R-bispecific radioligands, which should be based on other VPAC1R-specific peptides than PACAP-27.
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Affiliation(s)
- Simon Lindner
- Department of Nuclear Medicine, University Hospital Munich, Ludwig Maximilians-University Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Henning Rudolf
- Molecular Imaging and Radiochemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Giovanna Palumbo
- Department of Nuclear Medicine, University Hospital Munich, Ludwig Maximilians-University Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Rosel Oos
- Department of Nuclear Medicine, University Hospital Munich, Ludwig Maximilians-University Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Melissa Antons
- Department of Nuclear Medicine, University Hospital Munich, Ludwig Maximilians-University Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Ralph Hübner
- Biomedical Chemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Peter Bartenstein
- Department of Nuclear Medicine, University Hospital Munich, Ludwig Maximilians-University Munich, Marchioninistraße 15, 81377 Munich, Germany
| | - Ralf Schirrmacher
- Department of Oncology, Division of Oncological Imaging, University of Alberta, 11560 University Avenue, Edmonton, AB T6G 1Z2, Canada
| | - Björn Wängler
- Molecular Imaging and Radiochemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Carmen Wängler
- Biomedical Chemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
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Cheng X, Hübner R, von Kiedrowski V, Fricker G, Schirrmacher R, Wängler C, Wängler B. Design, Synthesis, In Vitro and In Vivo Evaluation of Heterobivalent SiFA lin-Modified Peptidic Radioligands Targeting Both Integrin α vβ 3 and the MC1 Receptor-Suitable for the Specific Visualization of Melanomas? Pharmaceuticals (Basel) 2021; 14:ph14060547. [PMID: 34200477 PMCID: PMC8228600 DOI: 10.3390/ph14060547] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 05/31/2021] [Accepted: 06/03/2021] [Indexed: 12/13/2022] Open
Abstract
Combining two peptides addressing two different receptors to a heterobivalent peptidic ligand (HBPL) is thought to enable an improved tumor-targeting sensitivity and thus tumor visualization, compared to monovalent peptide ligands. In the case of melanoma, the Melanocortin-1 receptor (MC1R), which is stably overexpressed in the majority of primary malignant melanomas, and integrin αvβ3, which is involved in lymph node metastasis and therefore has an important role in the transition from local to metastatic disease, are important target receptors. Thus, if a radiolabeled HBPL could be developed that was able to bind to both receptor types, the early diagnosis and correct staging of the disease would be significantly increased. Here, we report on the design, synthesis, radiolabeling and in vitro and in vivo testing of different SiFAlin-modified HBPLs (SiFA = silicon fluoride acceptor), consisting of an MC1R-targeting (GG-Nle-c(DHfRWK)) and an integrin αvβ3-affine peptide (c(RGDfK)), being connected by a symmetrically branching framework including linkers of differing length and composition. Kit-like 18F-radiolabeling of the HBPLs 1–6 provided the labeled products [18F]1–[18F]6 in radiochemical yields of 27–50%, radiochemical purities of ≥95% and non-optimized molar activities of 17–51 GBq/μmol within short preparation times of 25 min. Besides the evaluation of radiotracers regarding logD(7.4) and stability in human serum, the receptor affinities of the HBPLs were investigated in vitro on cell lines overexpressing integrin αvβ3 (U87MG cells) or the MC1R (B16F10). Based on these results, the most promising compounds [18F]2, showing the highest affinity to both target receptors (IC50 (B16F10) = 0.99 ± 0.11 nM, IC50 (U87MG) = 1300 ± 288 nM), and [18F]4, exhibiting the highest hydrophilicity (logD(7.4) = −1.39 ± 0.03), were further investigated in vivo and ex vivo in a xenograft mouse model bearing both tumors. For both HBPLs, clear visualization of B16F10, as well as U87MG tumors, was feasible. Blocking studies using the respective monospecific peptides demonstrated both peptide binders of the HBPLs contributing to tumor uptake. Despite the somewhat lower target receptor affinities (IC50 (B16F10) = 6.00 ± 0.47 nM and IC50 (U87MG) = 2034 ± 323 nM) of [18F]4, the tracer showed higher absolute tumor uptakes ([18F]4: 2.58 ± 0.86% ID/g in B16F10 tumors and 3.92 ± 1.31% ID/g in U87MG tumors; [18F]2: 2.32 ± 0.49% ID/g in B16F10 tumors and 2.33 ± 0.46% ID/g in U87MG tumors) as well as higher tumor-to-background ratios than [18F]2. Thus, [18F]4 demonstrates to be a highly potent radiotracer for the sensitive and bispecific imaging of malignant melanoma by PET/CT imaging and impressively illustrates the suitability of the underlying concept to develop heterobivalent integrin αvβ3- and MC1R-bispecific radioligands for the sensitive and specific imaging of malignant melanoma by PET/CT.
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Affiliation(s)
- Xia Cheng
- Molecular Imaging and Radiochemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1–3, 68167 Mannheim, Germany; (X.C.); (V.v.K.)
| | - Ralph Hübner
- Biomedical Chemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1–3, 68167 Mannheim, Germany;
| | - Valeska von Kiedrowski
- Molecular Imaging and Radiochemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1–3, 68167 Mannheim, Germany; (X.C.); (V.v.K.)
| | - Gert Fricker
- Institute of Pharmacy and Molecular Biotechnology, University of Heidelberg, Im Neuenheimer Feld 329, 69120 Heidelberg, Germany;
| | - Ralf Schirrmacher
- Department of Oncology, Division of Oncological Imaging, University of Alberta, 11560 University Avenue, Edmonton, AB T6G 1Z2, Canada;
| | - Carmen Wängler
- Biomedical Chemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1–3, 68167 Mannheim, Germany;
- Correspondence: (C.W.); (B.W.)
| | - Björn Wängler
- Molecular Imaging and Radiochemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1–3, 68167 Mannheim, Germany; (X.C.); (V.v.K.)
- Correspondence: (C.W.); (B.W.)
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Judmann B, Braun D, Wängler B, Schirrmacher R, Fricker G, Wängler C. Current State of Radiolabeled Heterobivalent Peptidic Ligands in Tumor Imaging and Therapy. Pharmaceuticals (Basel) 2020; 13:E173. [PMID: 32751666 DOI: 10.3390/ph13080173] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 07/27/2020] [Accepted: 07/28/2020] [Indexed: 12/15/2022] Open
Abstract
Over the past few years, an approach emerged that combines different receptor-specific peptide radioligands able to bind different target structures on tumor cells concomitantly or separately. The reason for the growing interest in this special field of radiopharmaceutical development is rooted in the fact that bispecific peptide heterodimers can exhibit a strongly increased target cell avidity and specificity compared to their corresponding monospecific counterparts by being able to bind to two different target structures that are overexpressed on the cell surface of several malignancies. This increase of avidity is most pronounced in the case of concomitant binding of both peptides to their respective targets but is also observed in cases of heterogeneously expressed receptors within a tumor entity. Furthermore, the application of a radiolabeled heterobivalent agent can solve the ubiquitous problem of limited tumor visualization sensitivity caused by differential receptor expression on different tumor lesions. In this article, the concept of heterobivalent targeting and the general advantages of using radiolabeled bispecific peptidic ligands for tumor imaging or therapy as well as the influence of molecular design and the receptors on the tumor cell surface are explained, and an overview is given of the radiolabeled heterobivalent peptides described thus far.
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Michalski K, Stoykow C, Bronsert P, Juhasz-Böss I, Meyer PT, Ruf J, Erbes T, Asberger J. Association between gastrin-releasing peptide receptor expression as assessed with [ 68Ga]Ga-RM2 PET/CT and histopathological tumor regression after neoadjuvant chemotherapy in primary breast cancer. Nucl Med Biol 2020; 86-87:37-43. [PMID: 32473549 DOI: 10.1016/j.nucmedbio.2020.05.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 05/05/2020] [Accepted: 05/08/2020] [Indexed: 12/24/2022]
Abstract
INTRODUCTION The gastrin-releasing peptide receptor is overexpressed in breast cancer (BC) tissue and can be visualized by positron emission tomography (PET) using the GRPR antagonist [68Ga]Ga-RM2. This study assessed tumor binding of RM2 before and after neoadjuvant chemotherapy (NAC) in primary BC with reference to residual tumor size in the resected specimen. MATERIALS AND METHODS In this retrospective study, five female patients with biopsy-confirmed estrogen receptor (ER)-positive primary BC (one with bilateral tumors) underwent [68Ga]Ga-RM2 PET/CT before and after NAC. PET/CT was acquired 1 h after injection of 143-224 MBq [68Ga]Ga-RM2. Time from pre-NAC PET to beginning of NAC was 23 ± 4.9 days, from end of NAC to post-NAC PET 18.7 ± 6.3 days, and from post-NAC PET to surgery 9.5 ± 10.8 days. In vivo tumor uptake of [68Ga]Ga-RM2 was assessed before and after NAC and correlated with histopathological response. RESULTS All tumors (6/6) showed strongly increased [68Ga]Ga-RM2 uptake compared to normal breast tissue on pre-NAC PET (mean SUVmax 13.2 ± 7.3; mean SUVpeak 9.4 ± 4.4). [68Ga]Ga-RM2 uptake was significantly reduced on post-NAC PET in all primary tumors (mean SUVmax 2.3 ± 0.8, -79 ± 11%; p = 0.0125; mean SUVpeak 1.6 ± 0.4, -79 ± 10%; p = 0.0096). Residual tumor size in resected specimens correlated well with SUVmax (r = 0.91, p = 0.0057) and SUVpeak (r = 0.88, p = 0.0196) on [68Ga]Ga-RM2 PET/CT after NAC. CONCLUSION AND IMPLICATIONS FOR PATIENT CARE In this pilot study, residual uptake of [68Ga]Ga-RM2 in ER-positive primary BC correlated well with residual vital tumor size after NAC. This suggests that [68Ga]Ga-RM2 PET/CT merits further investigation for response assessment to NAC in patients with ER-positive BC.
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Affiliation(s)
- Kerstin Michalski
- Department of Nuclear Medicine, University Medical Center Freiburg, Germany.
| | - Christian Stoykow
- Department of Nuclear Medicine, University Medical Center Freiburg, Germany
| | - Peter Bronsert
- Department for Surgical Pathology, University Medical Center Freiburg, Germany; German Cancer Consortium (DKTK), Freiburg, Germany; Tumorbank, Comprehensive Cancer Center Freiburg, University Medical Center Freiburg, Germany
| | - Ingolf Juhasz-Böss
- Department of Obstetrics and Gynecology, University Medical Center Freiburg, Germany
| | - Philipp T Meyer
- Department of Nuclear Medicine, University Medical Center Freiburg, Germany; German Cancer Consortium (DKTK), Freiburg, Germany
| | - Juri Ruf
- Department of Nuclear Medicine, University Medical Center Freiburg, Germany
| | - Thalia Erbes
- Department of Obstetrics and Gynecology, University Medical Center Freiburg, Germany
| | - Jasmin Asberger
- Department of Obstetrics and Gynecology, University Medical Center Freiburg, Germany
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Guillou A, Lima LMP, Esteban-Gómez D, Le Poul N, Bartholomä MD, Platas-Iglesias C, Delgado R, Patinec V, Tripier R. Methylthiazolyl Tacn Ligands for Copper Complexation and Their Bifunctional Chelating Agent Derivatives for Bioconjugation and Copper-64 Radiolabeling: An Example with Bombesin. Inorg Chem 2019; 58:2669-2685. [PMID: 30689368 DOI: 10.1021/acs.inorgchem.8b03280] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present here the synthesis of two new bifunctionalized azachelators, no2th-EtBzNCS and Hno2th1tha, as bioconjugable analogues of two previously described di- and trimethylthiazolyl 1,4,7-triazacyclononane (tacn) ligands, no2th and no3th, for potential uses in copper-64 (64Cu) positron emission tomography imaging. The first one bears an isothiocyanate group on the remaining free nitrogen atom of the tacn framework, while the second one presents an additional carboxylic function on one of the three heterocyclic pendants. Their syntheses required regiospecific N-functionalization of the macrocycles. In order to investigate their suitability for in vivo applications, a complete study of their copper(II) chelation was performed. The acid-base properties of the ligands and their thermodynamic stability constants with copper(II) and zinc(II) cations were determined using potentiometric techniques. Structural studies were conducted in both solution and the solid state, consolidated by theoretical calculations. The kinetic inertness in an acidic medium of both copper(II) complexes was determined by spectrophotometry, while cyclic voltammetry experiments were performed to evaluate the stability at the copper(I) redox state. UV-vis, NMR (of the zinc complexes), electron paramagnetic resonance spectroscopy, and density functional theory studies showed excellent agreement between the solution structures of the complexes and their crystallographic data. These investigations unambiguously prove that these bifunctional derivatives display similar coordination properties as their no2th and no3th counterparts, opening the door to targeted bioapplications. The no2th-EtBzNCS and Hno2th1tha ligands were then conjugated to a bombesin antagonist peptide for targeting the gastrin-releasing peptide receptor (GRPr). To highlight the potential of the two chelators for radiopharmaceutical development, the 64Cu-radiolabeling properties, in vitro stability, and binding affinity to GRPr of the corresponding bioconjugates were determined. Altogether, the results of this work warrant the further development of 64Cu-based radiopharmaceuticals comprising our novel bifunctional chelators.
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Affiliation(s)
- Amaury Guillou
- UFR des Sciences et Techniques , UMR-CNRS 6521, Université de Bretagne Occidentale , 6 avenue Victor le Gorgeu, C.S. 93837 , 29238 Brest Cedex 3 , France
| | - Luís M P Lima
- Instituto de Tecnologia Química e Biológica António Xavier , Universidade Nova de Lisboa , Avenida da República , 2780-157 Oeiras , Portugal
| | - David Esteban-Gómez
- Departamento de Química, Facultade de Ciencias & Centro de Investigaciones Científicas Avanzadas , Universidade da Coruña , 15071 A Coruña , Spain
| | - Nicolas Le Poul
- UFR des Sciences et Techniques , UMR-CNRS 6521, Université de Bretagne Occidentale , 6 avenue Victor le Gorgeu, C.S. 93837 , 29238 Brest Cedex 3 , France
| | - Mark D Bartholomä
- Department of Nuclear Medicine , Saarland University-Medical Center , Kirrbergerstrasse , 66421 Homburg , Germany
| | - Carlos Platas-Iglesias
- Departamento de Química, Facultade de Ciencias & Centro de Investigaciones Científicas Avanzadas , Universidade da Coruña , 15071 A Coruña , Spain
| | - Rita Delgado
- Instituto de Tecnologia Química e Biológica António Xavier , Universidade Nova de Lisboa , Avenida da República , 2780-157 Oeiras , Portugal
| | - Véronique Patinec
- UFR des Sciences et Techniques , UMR-CNRS 6521, Université de Bretagne Occidentale , 6 avenue Victor le Gorgeu, C.S. 93837 , 29238 Brest Cedex 3 , France
| | - Raphaël Tripier
- UFR des Sciences et Techniques , UMR-CNRS 6521, Université de Bretagne Occidentale , 6 avenue Victor le Gorgeu, C.S. 93837 , 29238 Brest Cedex 3 , France
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Vall-Sagarra A, Litau S, Decristoforo C, Wängler B, Schirrmacher R, Fricker G, Wängler C. Design, Synthesis, In Vitro, and Initial In Vivo Evaluation of Heterobivalent Peptidic Ligands Targeting Both NPY(Y₁)- and GRP-Receptors-An Improvement for Breast Cancer Imaging? Pharmaceuticals (Basel) 2018; 11:ph11030065. [PMID: 29973529 PMCID: PMC6161111 DOI: 10.3390/ph11030065] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 06/29/2018] [Accepted: 07/03/2018] [Indexed: 12/20/2022] Open
Abstract
Heterobivalent peptidic ligands (HBPLs), designed to address two different receptors independently, are highly promising tumor imaging agents. For example, breast cancer has been shown to concomitantly and complementarily overexpress the neuropeptide Y receptor subtype 1 (NPY(Y1)R) as well as the gastrin-releasing peptide receptor (GRPR). Thus, radiolabeled HBPLs being able to bind these two receptors should exhibit an improved tumor targeting efficiency compared to monospecific ligands. We developed here such bispecific HBPLs and radiolabeled them with 68Ga, achieving high radiochemical yields, purities, and molar activities. We evaluated the HBPLs and their monospecific reference peptides in vitro regarding stability and uptake into different breast cancer cell lines and found that the 68Ga-HBPLs were efficiently taken up via the GRPR. We also performed in vivo PET/CT imaging and ex vivo biodistribution studies in T-47D tumor-bearing mice for the most promising 68Ga-HBPL and compared the results to those obtained for its scrambled analogs. The tumors could easily be visualized by the newly developed 68Ga-HBPL and considerably higher tumor uptakes and tumor-to-background ratios were obtained compared to the scrambled analogs in and ex vivo. These results demonstrate the general feasibility of the approach to use bispecific radioligands for in vivo imaging of breast cancer.
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Affiliation(s)
- Alicia Vall-Sagarra
- Biomedical Chemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
| | - Shanna Litau
- Biomedical Chemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
- Molecular Imaging and Radiochemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
| | - Clemens Decristoforo
- Department of Nuclear Medicine, University Hospital Innsbruck, Medical University Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria.
| | - Björn Wängler
- Molecular Imaging and Radiochemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
| | - Ralf Schirrmacher
- Department of Oncology, Division Oncological Imaging, University of Alberta, 11560 University Avenue, Edmonton, AB T6G 1Z2, Canada.
| | - Gert Fricker
- Institute of Pharmacy and Molecular Biotechnology, University of Heidelberg, Im Neuenheimer Feld 329, 69120 Heidelberg, Germany.
| | - Carmen Wängler
- Biomedical Chemistry, Department of Clinical Radiology and Nuclear Medicine, Medical Faculty Mannheim of Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
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11
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Lindner S, Fiedler L, Wängler B, Bartenstein P, Schirrmacher R, Wängler C. Design, synthesis and in vitro evaluation of heterobivalent peptidic radioligands targeting both GRP- and VPAC1-Receptors concomitantly overexpressed on various malignancies – Is the concept feasible? Eur J Med Chem 2018; 155:84-95. [DOI: 10.1016/j.ejmech.2018.05.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 05/23/2018] [Accepted: 05/28/2018] [Indexed: 02/06/2023]
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12
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Liolios C, Buchmuller B, Bauder-Wüst U, Schäfer M, Leotta K, Haberkorn U, Eder M, Kopka K. Monomeric and Dimeric 68Ga-Labeled Bombesin Analogues for Positron Emission Tomography (PET) Imaging of Tumors Expressing Gastrin-Releasing Peptide Receptors (GRPrs). J Med Chem 2018; 61:2062-2074. [PMID: 29432691 DOI: 10.1021/acs.jmedchem.7b01856] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The GRPr, highly expressed in prostate PCa and breast cancer BCa, is a promising target for the development of new PET radiotracers. The chelator HBED-CC ( N, N'-bis[2-hydroxy-5-(carboxyethyl)benzyl]ethylenediamine- N, N'-diacetic acid) was coupled to the bombesin peptides: HBED-C-BN(2-14) 1, HBED-CC-PEG2-[d-Tyr6,β-Ala11,Thi13,Nle14]-BN(6-14) 2, HBED-CC-Y-[d-Phe6,Sta13,Leu14]-BN(6-14) (Y = 4-amino-1-carboxymethylpiperidine) 3, and HBED-CC-{PEG2-Y-[d-Phe6,Sta13,Leu14]-BN(6-14)}2 4 (homodimer). Compounds 1-4 presented high binding affinities for GRPr (T47D, 0.56-3.51 nM; PC-3, 2.12-4.68 nM). In PC-3 and T47D cells, agonists [68Ga]1 and [68Ga]2 were mainly internalized while antagonists [68Ga]3 and [68Ga]4 were surface bound. Cell-related radioactivity reached a maximum after 45 min, while tracer levels followed GRPr expression (PC-3 > T47D > LNCaP > MDA-MB-231). [68Ga]4 showed the highest cell-bound radioactivity (PC-3 and T47D). In vivo, tumor (PC-3) targeting for [68Ga]3 and [68Ga]4 increased over time, with dynamic μPET showing clearer tumors images at later time points. [68Ga]3 and [68Ga]4 can be considered suitable PET tracers for imaging PCa and BCa expressing GRPr.
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Affiliation(s)
| | | | | | | | | | - Uwe Haberkorn
- Department of Nuclear Medicine , University of Heidelberg , Im Neuenheimer Feld 400 , 69120 Heidelberg , Germany
| | - Matthias Eder
- Division of Radiopharmaceutical Development, German Cancer Consortium (DKTK) Freiburg, and Department of Nuclear Medicine, Faculty of Medicine, Medical Center, University of Freiburg, Hugstetter Straße 55 , 79106 Freiburg , Germany
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Stott Reynolds TJ, Smith CJ, Lewis MR. Peptide-Based Radiopharmaceuticals for Molecular Imaging of Prostate Cancer. Advances in Experimental Medicine and Biology 2018. [DOI: 10.1007/978-3-319-99286-0_8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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14
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Stoykow C, Erbes T, Maecke HR, Bulla S, Bartholomä M, Mayer S, Drendel V, Bronsert P, Werner M, Gitsch G, Weber WA, Stickeler E, Meyer PT. Gastrin-releasing Peptide Receptor Imaging in Breast Cancer Using the Receptor Antagonist (68)Ga-RM2 And PET. Theranostics 2016; 6:1641-50. [PMID: 27446498 PMCID: PMC4955063 DOI: 10.7150/thno.14958] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Accepted: 04/08/2016] [Indexed: 01/07/2023] Open
Abstract
Introduction: The gastrin-releasing peptide receptor (GRPR) is overexpressed in breast cancer. The present study evaluates GRPR imaging as a novel imaging modality in breast cancer by employing positron emission tomography (PET) and the GRPR antagonist 68Ga-RM2. Methods: Fifteen female patients with biopsy confirmed primary breast carcinoma (3 bilateral tumors; median clinical stage IIB) underwent 68Ga-RM2-PET/CT for pretreatment staging. In vivo tumor uptake of 68Ga-RM2 was correlated with estrogen (ER) and progesterone (PR) receptor expression, HER2/neu status and MIB-1 proliferation index in breast core biopsy specimens. Results: 13/18 tumors demonstrated strongly increased 68Ga-RM2 uptake compared to normal breast tissue (defined as PET-positive). All PET-positive primary tumors were ER- and PR-positive (13/13) in contrast to only 1/5 PET-negative tumors. Mean SUVMAX of ER-positive tumors was 10.6±6.0 compared to 2.3±1.0 in ER-negative tumors (p=0.016). In a multivariate analysis including ER, PR, HER2/neu and MIB-1, only ER expression predicted 68Ga-RM2 uptake (model: r2=0.55, p=0.025). Normal breast tissue showed inter- and intraindividually variable, moderate GRPR binding (SUVMAX 2.3±1.0), while physiological uptake of other organs was considerably less except pancreas. Of note, 68Ga-RM2-PET/CT detected internal mammary lymph nodes with high 68Ga-RM2 uptake (n=8), a contralateral axillary lymph node metastasis (verified by biopsy) and bone metastases (n=1; not detected by bone scan and CT). Conclusion: Our study demonstrates that 68Ga-RM2-PET/CT is a promising imaging method in ER-positive breast cancer. In vivo GRPR binding assessed by 68Ga-RM2-PET/CT correlated with ER expression in primary tumors of untreated patients.
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Ramos-Álvarez I, Moreno P, Mantey SA, Nakamura T, Nuche-Berenguer B, Moody TW, Coy DH, Jensen RT. Insights into bombesin receptors and ligands: Highlighting recent advances. Peptides 2015; 72:128-44. [PMID: 25976083 PMCID: PMC4641779 DOI: 10.1016/j.peptides.2015.04.026] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 04/29/2015] [Accepted: 04/30/2015] [Indexed: 12/22/2022]
Abstract
This following article is written for Prof. Abba Kastin's Festschrift, to add to the tribute to his important role in the advancement of the role of peptides in physiological, as well as pathophysiological processes. There have been many advances during the 35 years of his prominent role in the Peptide field, not only as editor of the journal Peptides, but also as a scientific investigator and editor of two volumes of the Handbook of Biological Active Peptides [146,147]. Similar to the advances with many different peptides, during this 35 year period, there have been much progress made in the understanding of the pharmacology, cell biology and the role of (bombesin) Bn receptors and their ligands in various disease states, since the original isolation of bombesin from skin of the European frog Bombina bombina in 1970 [76]. This paper will briefly review some of these advances over the time period of Prof. Kastin 35 years in the peptide field concentrating on the advances since 2007 when many of the results from earlier studies were summarized [128,129]. It is appropriate to do this because there have been 280 articles published in Peptides during this time on bombesin-related peptides and it accounts for almost 5% of all publications. Furthermore, 22 Bn publications we have been involved in have been published in either Peptides [14,39,55,58,81,92,93,119,152,216,225,226,231,280,302,309,355,361,362] or in Prof. Kastin's Handbook of Biological Active Peptides [137,138,331].
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Affiliation(s)
- Irene Ramos-Álvarez
- Digestive Diseases Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892-1804, United States
| | - Paola Moreno
- Digestive Diseases Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892-1804, United States
| | - Samuel A Mantey
- Digestive Diseases Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892-1804, United States
| | - Taichi Nakamura
- Digestive Diseases Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892-1804, United States
| | - Bernardo Nuche-Berenguer
- Digestive Diseases Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892-1804, United States
| | - Terry W Moody
- Center for Cancer Research, Office of the Director, NCI, National Institutes of Health, Bethesda, MD 20892-1804, United States
| | - David H Coy
- Peptide Research Laboratory, Department of Medicine, Tulane University Health Sciences Center, New Orleans, LA 70112-2699, United States
| | - Robert T Jensen
- Digestive Diseases Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892-1804, United States.
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Ischia J, Patel O, Bolton D, Shulkes A, Baldwin GS. Expression and function of gastrin-releasing peptide (GRP) in normal and cancerous urological tissues. BJU Int 2014; 113 Suppl 2:40-7. [PMID: 24894852 DOI: 10.1111/bju.12594] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Gastrin-releasing peptide (GRP) acts as an important regulatory peptide in several normal physiological processes and as a growth factor in certain cancers. In this review we provide a comprehensive overview of the current state of knowledge of GRP in urological tissues under both normal and cancerous conditions. GRP and its receptor, GRP-R, are expressed in the normal kidney and renal cancers. GRP can stimulate the growth of renal cancer cells. GRP and GRP-R are expressed in prostate cancer and GRP can stimulate the growth of prostate cancer cell lines. Importantly, GRP is a key neuroendocrine peptide, which may be involved in the progression of advanced prostate cancer and in the neuroendocrine differentiation of prostate cancer. Recent animal studies have shown that GRP and GRP-R are an integral part of male sexual function and play a crucial role in spinal control of erections and ejaculation.
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Affiliation(s)
- Joseph Ischia
- Department of Surgery, Austin Health, Melbourne, VIC, Australia; Department of Urology, University of Melbourne, Austin Health, Melbourne, VIC, Australia
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Ferrero E, Mauricio MD, Granado M, García-Villar O, Aldasoro M, Vila JM, Hidalgo M, Ferrero JL, Fernández N, Monge L, García-Villalón AL. Tyrosine phosphorylation modulates the vascular responses of mesenteric arteries from human colorectal tumors. Biomed Res Int 2013; 2013:545983. [PMID: 24324963 DOI: 10.1155/2013/545983] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 08/07/2013] [Accepted: 10/02/2013] [Indexed: 01/09/2023]
Abstract
The aim of this study was to analyze whether tyrosine phosphorylation in tumoral arteries may modulate their vascular response. To do this, mesenteric arteries supplying blood flow to colorectal tumors or to normal intestine were obtained during surgery and prepared for isometric tension recording in an organ bath. Increasing tyrosine phosphorylation with the phosphatase inhibitor, sodium orthovanadate produced arterial contraction which was lower in tumoral than in control arteries, whereas it reduced the contraction to noradrenaline in tumoral but not in control arteries and reduced the relaxation to bradykinin in control but not in tumoral arteries. Protein expression of VEGF-A and of the VEGF receptor FLT1 was similar in control and tumoral arteries, but expression of the VEGF receptor KDR was increased in tumoral compared with control arteries. This suggests that tyrosine phosphorylation may produce inhibition of the contraction in tumoral mesenteric arteries, which may increase blood flow to the tumor when tyrosine phosphorylation is increased by stimulation of VEGF receptors.
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18
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Fischer G, Schirrmacher R, Wängler B, Wängler C. Radiolabeled Heterobivalent Peptidic Ligands: an Approach with High Future Potential for in vivo Imaging and Therapy of Malignant Diseases. ChemMedChem 2013; 8:883-90. [DOI: 10.1002/cmdc.201300081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Indexed: 12/19/2022]
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Mansi R, Fleischmann A, Mäcke HR, Reubi JC. Targeting GRPR in urological cancers--from basic research to clinical application. Nat Rev Urol 2013; 10:235-44. [PMID: 23507930 DOI: 10.1038/nrurol.2013.42] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Gastrin releasing peptide (GRP) is a regulatory peptide that acts through its receptor (GRPR) to regulate physiological functions in various organs. GRPR is overexpressed in neoplastic cells of most prostate cancers and some renal cell cancers and in the tumoral vessels of urinary tract cancers. Thus, targeting these tumours with specifically designed GRP analogues has potential clinical application. Potent and specific radioactive, cytotoxic or nonradioactive GRP analogues have been designed and tested in various animal tumour models with the aim of receptor targeting for tumour diagnosis or therapy. All three categories of compound were found suitable for tumour targeting in animal models. The cytotoxic and nonradioactive GRP analogues have not yet shown convincing tumour-reducing effects in human trials; however, the first clinical studies of radioactive GRP analogues--both agonists and antagonists--suggest promising opportunities for both diagnostic tumour imaging and radiotherapy of prostate and other GRPR-expressing cancers.
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Li Y, Lei Y, Wagner E, Xie C, Lu W, Zhu J, Shen J, Wang J, Liu M. Potent Retro-Inverso d-Peptide for Simultaneous Targeting of Angiogenic Blood Vasculature and Tumor Cells. Bioconjug Chem 2013; 24:133-43. [DOI: 10.1021/bc300537z] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ying Li
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Yang Lei
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Ernst Wagner
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Cao Xie
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Weiyue Lu
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Jianhua Zhu
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Jie Shen
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Jing Wang
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
| | - Min Liu
- Key Laboratory
of Smart Drug Delivery, Ministry of Education and PLA, Department
of Pharmaceutics, and ‡Department of Radiopharmacy, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203,
P.R. China
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Current World Literature. Curr Opin Oncol 2013; 25:99-104. [DOI: 10.1097/cco.0b013e32835c1381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
A precise definition of the tumor tissue targets to be selected for in vivo peptide receptor targeting, namely to know which peptide receptor is expressed in which type of cancer, is an important prerequisite for successful clinical application of this technology. In this short review, I give three selected examples of new and promising peptide receptor targets. In the somatostatin receptor field, based on in vitro receptor autoradiography experiments showing that much more sst(2) binding sites are detected in tumors using a (177)Lu-labeled sst(2) antagonist than a (177)Lu-labeled agonist, it can be proposed that, in addition to neuroendocrine tumors, nonneuroendocrine tumors with lower sst(2) levels such as breast carcinomas, renal cell carcinomas, and non-Hodgkin lymphomas may become potential candidates for sst(2) antagonist targeting. In the gastrin-releasing peptide receptor field, recent in vitro data show that not only tumor cells may overexpress gastrin-releasing peptide receptors but also neoangiogenic tumoral vessels, making tumors expressing high levels of gastrin-releasing peptide receptors in tumor vessels, such as ovarian or urinary tract cancers, attractive new candidates for gastrin-releasing peptide receptor targeting. In the incretin receptor field, it was found in vitro that, apart from glucagon-like peptide 1 receptors overexpressed in benign insulinomas, incretin receptors, especially the glucose-dependent insulinotropic polypeptide receptors, can be overexpressed in medullary thyroid cancers, an unexpected finding making also these tumors potential novel candidates for incretin receptor targeting. Due to the abundance of peptide receptors in various cancers, it may be possible in the future to define for each tumor type a corresponding overexpressed peptide receptor suitable for targeting.
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