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Shirke AA, Wang J, Ramamurthy G, Mahanty A, Walker E, Zhang L, Panigrahi A, Wang X, Basilion JP. Prostate Specific Membrane Antigen Expression in a Syngeneic Breast Cancer Mouse Model. Mol Imaging Biol 2024:10.1007/s11307-024-01920-2. [PMID: 38760621 DOI: 10.1007/s11307-024-01920-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 04/09/2024] [Accepted: 04/22/2024] [Indexed: 05/19/2024]
Abstract
PURPOSE Prostate specific membrane antigen (PSMA) has been studied in human breast cancer (BCa) biopsies, however, lack of data on PSMA expression in mouse models impedes development of PSMA-targeted therapies, particularly in improving breast conserving surgery (BCS) margins. This study aimed to validate and characterize the expression of PSMA in murine BCa models, demonstrating that PSMA can be utilized to improve therapies and imaging techniques. METHODS Murine triple negative breast cancer 4T1 cells, and human cell lines, MDA-MB-231, MDA-MB-468, implanted into the mammary fat pads of BALB/c mice, were imaged by our PSMA targeted theranostic agent, PSMA-1-Pc413, and tumor to background ratios (TBR) were calculated to validate selective uptake. Immunohistochemistry was used to correlate PSMA expression in relation to CD31, an endothelial cell biomarker highlighting neovasculature. PSMA expression was also quantified by Reverse Transcriptase Polymerase Chain Reaction (RT-PCR). RESULTS Accumulation of PSMA-1-Pc413 was observed in 4T1 primary tumors and associated metastases. Average TBR of 4T1 tumors were calculated to be greater than 1.5-ratio at which tumor tissues can be distinguished from normal structures-at peak accumulation with the signal intensity in 4T1 tumors comparable to that in high PSMA expressing PC3-pip tumors. Extraction of 4T1 tumors and lung metastases followed by RT-PCR analysis and PSMA-CD31 co-staining shows that PSMA is consistently localized on tumor neovasculature with no expression in tumor cells and surrounding normal tissues. CONCLUSION The selective uptake of PSMA-1-Pc413 in these cancer tissues as well as the characterization and validation of PSMA expression on neovasculature in this syngeneic 4T1 model emphasizes their potential for advancements in targeted therapies and imaging techniques for BCa. PSMA holds great promise as an oncogenic target for BCa and its associated metastases.
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Affiliation(s)
- Aditi A Shirke
- Department of Biomedical Engineering, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA.
| | - Jing Wang
- Department of Radiology, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA
| | - Gopolakrishnan Ramamurthy
- Department of Radiology, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA
| | - Arpan Mahanty
- Department of Radiology, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA
| | - Ethan Walker
- Department of Biomedical Engineering, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA
| | - Lifang Zhang
- Department of Radiology, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA
| | - Abhiram Panigrahi
- Department of Radiology, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA
| | - Xinning Wang
- Department of Biomedical Engineering, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA.
| | - James P Basilion
- Department of Biomedical Engineering, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA.
- Department of Radiology, Case Western Reserve University, 11100 Euclid Ave, Wearn Building B-49, Cleveland, OH, 44106, USA.
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Heesch A, Florea A, Maurer J, Habib P, Werth LS, Hansen T, Stickeler E, Sahnoun SEM, Mottaghy FM, Morgenroth A. The prostate-specific membrane antigen holds potential as a vascular target for endogenous radiotherapy with [ 177Lu]Lu-PSMA-I&T for triple-negative breast cancer. Breast Cancer Res 2024; 26:30. [PMID: 38378689 PMCID: PMC10877802 DOI: 10.1186/s13058-024-01787-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 02/13/2024] [Indexed: 02/22/2024] Open
Abstract
INTRODUCTION Overexpression of prostate-specific membrane antigen (PSMA) on the vasculature of triple-negative breast cancer (TNBC) presents a promising avenue for targeted endogenous radiotherapy with [177Lu]Lu-PSMA-I&T. This study aimed to assess and compare the therapeutic efficacy of a single dose with a fractionated dose of [177Lu]Lu-PSMA-I&T in an orthotopic model of TNBC. METHODS Rj:NMRI-Foxn1nu/nu mice were used as recipients of MDA-MB-231 xenografts. The single dose group was treated with 1 × 60 ± 5 MBq dose of [177Lu]Lu-PSMA-I&T, while the fractionated dose group received 4 × a 15 ± 2 MBq dose of [177Lu]Lu-PSMA-I&T at 7 day intervals. The control group received 0.9% NaCl. Tumor progression was monitored using [18F]FDG-PET/CT. Ex vivo analysis encompassed immunostaining, TUNEL staining, H&E staining, microautoradiography, and autoradiography. RESULTS Tumor volumes were significantly smaller in the single dose (p < 0.001) and fractionated dose (p < 0.001) groups. Tumor growth inhibition rates were 38% (single dose) and 30% (fractionated dose). Median survival was notably prolonged in the treated groups compared to the control groups (31d, 28d and 19d for single dose, fractionated dose and control, respectively). [177Lu]Lu-PSMA-I&T decreased the size of viable tumor areas. We further demonstrated, that [177Lu]Lu-PSMA-I&T binds specifically to the tumor-associated vasculature. CONCLUSION This study highlights the potential of [177Lu]Lu-PSMA-I&T for endogenous radiotherapy of TNBC.
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Affiliation(s)
- Amelie Heesch
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Pauwelsstraße 30, 52074, Aachen, Germany.
| | - Alexandru Florea
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Pauwelsstraße 30, 52074, Aachen, Germany
- Department of Radiology and Nuclear Medicine, Maastricht University Medical Center (MUMC+), 6202, Maastricht, The Netherlands
- School for Cardiovascular Diseases (CARIM), Maastricht University Medical Center (MUMC+), 6202, Maastricht, The Netherlands
| | - Jochen Maurer
- Department of Obstetrics and Gynecology, University Hospital RWTH Aachen, 52074, Aachen, Germany
- Center for Integrated Oncology (CIO), Aachen, Bonn, Cologne, Düsseldorf (ABCD), Germany
| | - Pardes Habib
- Department of Neurosurgery, School of Medicine, Stanford University, Stanford, USA
| | - Laura S Werth
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Thomas Hansen
- Department of Obstetrics and Gynecology, University Hospital RWTH Aachen, 52074, Aachen, Germany
| | - Elmar Stickeler
- Department of Obstetrics and Gynecology, University Hospital RWTH Aachen, 52074, Aachen, Germany
- Center for Integrated Oncology (CIO), Aachen, Bonn, Cologne, Düsseldorf (ABCD), Germany
| | - Sabri E M Sahnoun
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Felix M Mottaghy
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Pauwelsstraße 30, 52074, Aachen, Germany
- Department of Radiology and Nuclear Medicine, Maastricht University Medical Center (MUMC+), 6202, Maastricht, The Netherlands
- Center for Integrated Oncology (CIO), Aachen, Bonn, Cologne, Düsseldorf (ABCD), Germany
| | - Agnieszka Morgenroth
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Pauwelsstraße 30, 52074, Aachen, Germany
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Simunic M, Joshi JT, Merkens H, Colpo N, Kuo HT, Lum JJ, Bénard F. PSMA imaging as a non-invasive tool to monitor inducible gene expression in vivo. EJNMMI Res 2024; 14:3. [PMID: 38177950 PMCID: PMC10767034 DOI: 10.1186/s13550-023-01063-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 12/19/2023] [Indexed: 01/06/2024] Open
Affiliation(s)
- Marin Simunic
- Department of Hematology, Clinic for Internal Medicine, Clinical Hospital Centre, Spinciceva 1, 21000, Split, Croatia
| | - Jay T Joshi
- Deeley Research Centre, BC Cancer Research Institute, 2410 Lee Avenue, Victoria, BC, V8R 6V5, Canada
| | - Helen Merkens
- BC Cancer Research Institute, 675 West 10Th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Nadine Colpo
- BC Cancer Research Institute, 675 West 10Th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Hsiou-Ting Kuo
- BC Cancer Research Institute, 675 West 10Th Avenue, Vancouver, BC, V5Z 1L3, Canada
| | - Julian J Lum
- Deeley Research Centre, BC Cancer Research Institute, 2410 Lee Avenue, Victoria, BC, V8R 6V5, Canada
| | - François Bénard
- BC Cancer Research Institute, 675 West 10Th Avenue, Vancouver, BC, V5Z 1L3, Canada.
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Lee Z, Heston WD, Wang X, Basilion JP. GCP III is not the "off-target" for urea-based PSMA ligands. Eur J Nucl Med Mol Imaging 2023; 50:2944-2946. [PMID: 37191680 PMCID: PMC10382371 DOI: 10.1007/s00259-023-06265-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 05/09/2023] [Indexed: 05/17/2023]
Affiliation(s)
- Zhenghong Lee
- Radiology, School of Medicine, Case Western Reserve University, Nuclear Medicine, Radiology, University Hospitals Cleveland Medical Center, 11100 Euclid Ave., Cleveland, OH, 44106, USA.
| | | | - Xinning Wang
- Radiology, School of Medicine, Case Western Reserve University, Nuclear Medicine, Radiology, University Hospitals Cleveland Medical Center, 11100 Euclid Ave., Cleveland, OH, 44106, USA
- Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - James P Basilion
- Radiology, School of Medicine, Case Western Reserve University, Nuclear Medicine, Radiology, University Hospitals Cleveland Medical Center, 11100 Euclid Ave., Cleveland, OH, 44106, USA
- Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
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Yusufi N, Wurzer A, Herz M, D'Alessandria C, Feuerecker B, Weber W, Wester HJ, Nekolla S, Eiber M. Comparative Preclinical Biodistribution, Dosimetry, and Endoradiotherapy in Metastatic Castration-Resistant Prostate Cancer Using 19F/ 177Lu-rhPSMA-7.3 and 177Lu-PSMA I&T. J Nucl Med 2021; 62:1106-1111. [PMID: 33443072 DOI: 10.2967/jnumed.120.254516] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 12/04/2020] [Indexed: 12/29/2022] Open
Abstract
Radiohybrid prostate-specific membrane antigen (rhPSMA) ligands are applicable as radiochemical twins for both diagnostic PET imaging and endoradiotherapy. On the basis of preliminary data as a diagnostic ligand, the isomer rhPSMA-7.3 is a promising candidate for potential endoradiotherapy. The aim of this preclinical evaluation was to assess the biodistribution, dosimetry, and therapeutic efficacy of 19F/177Lu-rhPSMA-7.3 in comparison to the established therapeutic agent 177Lu-PSMA I&T (imaging and therapy). Methods: The biodistribution of 19F/177Lu-rhPSMA-7.3 and 177Lu-PSMA I&T was determined in LNCaP tumor-bearing severe combined immunodeficiency (SCID) mice after sacrifice at defined time points up to 7 d (n = 5). Organs and tumors were dissected, percentage injected dose per gram (%ID/g) was determined, and dosimetry was calculated using OLINDA/EXM, version 1.0. The therapeutic efficacy of a single 30-MBq dose of 19F/177Lu-rhPSMA-7.3 (n = 7) was compared with that of 177Lu-PSMA I&T in treatment groups (n = 7) and control groups (n = 6-7) using C4-2 tumor-bearing SCID mice by evaluating tumor growth and survival over 6 wk after treatment. Results: The biodistribution of 19F/177Lu-rhPSMA-7.3 revealed fast blood clearance (0.63 %ID/g at 1 h after injection), and the highest activity uptake was in the spleen and kidneys, particularly in the first hour (33.25 %ID/g and 207.6 %ID/g, respectively, at 1 h after injection), indicating a renal excretion pathway. Compared with 177Lu-PSMA I&T, 19F/177Lu-rhPSMA-7.3 exhibited an initial (1 h) 2.6-fold higher tumor uptake in LNCaP xenografts and a longer retention (4.5 %ID/g vs. 0.9 %ID/g at 168 h). The tumor dose of 19F/177Lu-rhPSMA-7.3 was substantially higher (e.g., 7.47 vs. 1.96 µGy/MBq at 200 mm3) than that of 177Lu-PSMA I&T. In most organs, absorbed doses were higher for 177Lu-PSMA I&T. A significantly greater tumor size reduction was shown for a single dose of 19F/177Lu-rhPSMA-7.3 than for 177Lu-PSMA I&T at the end of the experiment (P = 0.0167). At the predefined termination of the experiment at 6 wk, 7 of 7 and 3 of 7 mice were still alive in the 19F/177Lu-rhPSMA-7.3 and 177Lu-PSMA I&T groups, respectively, compared with the respective control groups, with 0 of 7 and 0 of 6 mice. Conclusion: Compared with 177Lu-PSMA I&T, 19F/177Lu-rhPSMA-7.3 can be considered a suitable candidate for clinical translation because it has similar clearance kinetics and a similar radiation dose to healthy organs but superior tumor uptake and retention. Preliminary treatment experiments showed a favorable antitumor response.
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Affiliation(s)
- Nahid Yusufi
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; and
| | - Alexander Wurzer
- Chair for Pharmaceutical Radiochemistry, Technical University of Munich, Garching, Germany
| | - Michael Herz
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; and
| | - Calogero D'Alessandria
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; and
| | - Benedikt Feuerecker
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; and
| | - Wolfgang Weber
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; and
| | - Hans-Jürgen Wester
- Chair for Pharmaceutical Radiochemistry, Technical University of Munich, Garching, Germany
| | - Stephan Nekolla
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; and
| | - Matthias Eiber
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; and
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Juzeniene A, Stenberg VY, Bruland ØS, Larsen RH. Preclinical and Clinical Status of PSMA-Targeted Alpha Therapy for Metastatic Castration-Resistant Prostate Cancer. Cancers (Basel) 2021; 13:779. [PMID: 33668474 PMCID: PMC7918517 DOI: 10.3390/cancers13040779] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 02/07/2021] [Accepted: 02/08/2021] [Indexed: 12/14/2022] Open
Abstract
Bone, lymph node, and visceral metastases are frequent in castrate-resistant prostate cancer patients. Since such patients have only a few months' survival benefit from standard therapies, there is an urgent need for new personalized therapies. The prostate-specific membrane antigen (PSMA) is overexpressed in prostate cancer and is a molecular target for imaging diagnostics and targeted radionuclide therapy (theragnostics). PSMA-targeted α therapies (PSMA-TAT) may deliver potent and local radiation more selectively to cancer cells than PSMA-targeted β- therapies. In this review, we summarize both the recent preclinical and clinical advances made in the development of PSMA-TAT, as well as the availability of therapeutic α-emitting radionuclides, the development of small molecules and antibodies targeting PSMA. Lastly, we discuss the potentials, limitations, and future perspectives of PSMA-TAT.
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Affiliation(s)
- Asta Juzeniene
- Department of Radiation Biology, Institute for Cancer Research, Norwegian Radium Hospital, Oslo University Hospital, Montebello, 0379 Oslo, Norway;
| | - Vilde Yuli Stenberg
- Department of Radiation Biology, Institute for Cancer Research, Norwegian Radium Hospital, Oslo University Hospital, Montebello, 0379 Oslo, Norway;
- Nucligen, Ullernchausséen 64, 0379 Oslo, Norway;
- Institute for Clinical Medicine, University of Oslo, Box 1171 Blindern, 0318 Oslo, Norway;
| | - Øyvind Sverre Bruland
- Institute for Clinical Medicine, University of Oslo, Box 1171 Blindern, 0318 Oslo, Norway;
- Department of Oncology, Norwegian Radium Hospital, Oslo University Hospital, 0379 Oslo, Norway
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Ioppolo JA, Nezich RA, Richardson KL, Morandeau L, Leedman PJ, Price RI. Direct in vivo comparison of [18F]PSMA-1007 with [68Ga]Ga-PSMA-11 and [18F]AlF-PSMA-11 in mice bearing PSMA-expressing xenografts. Appl Radiat Isot 2020; 161:109164. [DOI: 10.1016/j.apradiso.2020.109164] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 03/16/2020] [Accepted: 03/25/2020] [Indexed: 12/15/2022]
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Fully automated preparation of 68Ga-PSMA-11 at curie level quantity using cyclotron-produced 68Ga for clinical applications. Appl Radiat Isot 2020; 155:108936. [PMID: 31655351 DOI: 10.1016/j.apradiso.2019.108936] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/03/2019] [Accepted: 10/10/2019] [Indexed: 02/07/2023]
Abstract
68Ga-PSMA-11 is currently one of the most investigated PET agents for imaging both recurrent prostate cancer and relevant metastases; however, the production and distribution of 68Ga-PSMA-11 is limited to a supply of only a few daily doses when using a commercially available 68Ge/68Ga generator. 68Ge/68Ga generators deliver only a modest amount of activity, up to 1850 MBq (50 mCi), when new, but it decreases with time. Additionally, the production of 68Ga/68Ge generators has not been able to meet the increasing demand of 68Ga radiotracers. In response to the need for a more economically viable alternative, the focus of this study was to provide a simple and efficient method for producing 68Ga-PSMA-11, using cyclotron-produced 68Ga that is ready for routine clinical practice.
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9
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Ruigrok EAM, van Weerden WM, Nonnekens J, de Jong M. The Future of PSMA-Targeted Radionuclide Therapy: An Overview of Recent Preclinical Research. Pharmaceutics 2019; 11:E560. [PMID: 31671763 PMCID: PMC6921028 DOI: 10.3390/pharmaceutics11110560] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/23/2019] [Accepted: 10/24/2019] [Indexed: 12/15/2022] Open
Abstract
Prostate specific membrane antigen (PSMA) has become a major focus point in the research and development of prostate cancer (PCa) imaging and therapeutic strategies using radiolabeled tracers. PSMA has shown to be an excellent target for PCa theranostics because of its high expression on the membrane of PCa cells and the increase in expression during disease progression. Therefore, numerous PSMA-targeting tracers have been developed and (pre)clinically studied with promising results. However, many of these PSMA-targeting tracers show uptake in healthy organs such as the salivary glands, causing radiotoxicity. Furthermore, not all patients respond to PSMA-targeted radionuclide therapy (TRT). This created the necessity of additional preclinical research studies in which existing tracers are reevaluated and new tracers are developed in order to improve PSMA-TRT by protecting the (PSMA-expressing) healthy organs and improving tumor uptake. In this review we will give an overview of the recent preclinical research projects regarding PCa-TRT using PSMA-specific radiotracers, which will give an indication of where the PSMA-TRT research movement is going and what we can expect in future clinical trials.
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Affiliation(s)
- Eline A M Ruigrok
- Dept. of Radiology and Nuclear Medicine, Erasmus MC, 3015 GD Rotterdam, The Netherlands.
- Dept. of Experimental Urology, Erasmus MC, 3015 GD Rotterdam, The Netherlands.
| | | | - Julie Nonnekens
- Dept. of Radiology and Nuclear Medicine, Erasmus MC, 3015 GD Rotterdam, The Netherlands.
- Dept. of Molecular Genetics, Erasmus MC, 3015 GD Rotterdam, The Netherlands.
- Oncode Institute, Erasmus MC, 3015 GD Rotterdam, The Netherlands.
| | - Marion de Jong
- Dept. of Radiology and Nuclear Medicine, Erasmus MC, 3015 GD Rotterdam, The Netherlands.
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Simons BW, Turtle NF, Ulmert DH, Abou DS, Thorek DLJ. PSMA expression in the Hi-Myc model; extended utility of a representative model of prostate adenocarcinoma for biological insight and as a drug discovery tool. Prostate 2019; 79:678-685. [PMID: 30656716 PMCID: PMC6519119 DOI: 10.1002/pros.23770] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 12/27/2018] [Indexed: 12/11/2022]
Abstract
Prostate-specific membrane antigen (PSMA), also known as glutamate carboxypeptidase II (GCPII), is highly overexpressed in primary and metastatic prostate cancer (PCa). This has led to the development of radiopharmaceuticals for targeted imaging and therapy under current clinical evaluation. Despite this progress, the exact biological role of the protein in prostate cancer development and progression has not been fully elucidated. This is in part because the human PSMA and mouse PSMA (mPSMA) have different patterns of anatomical expression which confound study in the most widely utilized model organisms. Most notably, mPSMA is not expressed in the healthy murine prostate. Here, we reveal that mPSMA is highly upregulated in the prostate adenocarcinoma of the spontaneous Hi-Myc mouse model, a highly accurate and well characterized mouse model of prostate cancer development. Antibody detection and molecular imaging tools are used to confirm that mPSMA is expressed from early prostatic intraepithelial neoplasia (PIN) through adenocarcinoma.
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Affiliation(s)
- Brian W. Simons
- Center for Comparative MedicineBaylor College of MedicineHoustonTexas
| | - Norman F. Turtle
- Radiological Chemistry Imaging LaboratoryMallinckrodt Institute of RadiologyWashington University in St. LouisSt. LouisMissouri
| | - David H. Ulmert
- Johnsson Comprehensive Cancer CenterUniversity of CaliforniaLos AngelesCalifornia
- Department of Molecular and Medical PharmacologyUniversity of California Los AngelesLos AngelesCalifornia
| | - Diane S. Abou
- Radiological Chemistry Imaging LaboratoryMallinckrodt Institute of RadiologyWashington University in St. LouisSt. LouisMissouri
- Radiology Cyclotron Facility, Mallinckrodt Institute of RadiologyWashington University in St. LouisSt. Louis,Missouri
| | - Daniel L. J. Thorek
- Radiological Chemistry Imaging LaboratoryMallinckrodt Institute of RadiologyWashington University in St. LouisSt. LouisMissouri
- Department of Biomedical EngineeringWashington University in St. LouisSt. LouisMissouri
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