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Guo Z, Zhu L, Xu W, Luo X, Chen H, Li X, Zuo C. PD-L1 ImmunoPET on the basis of Avidin/Biotin pre-targeted cancer imaging. Biochem Biophys Res Commun 2023; 673:23-28. [PMID: 37354656 DOI: 10.1016/j.bbrc.2023.06.059] [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: 05/10/2023] [Revised: 05/20/2023] [Accepted: 06/17/2023] [Indexed: 06/26/2023]
Abstract
This study aimed to establish the radio-immune imaging protocol on the basis of Avidin/Biotin system. The programmed death-ligand 1 (PD-L1) antibody (Atezolizumab) was employed as the primary molecule in targeting PD-L1, and the two-step strategy, consisting of the first injection of Avidin-conjugated PD-L1 monoclonal antibody (Atezolizumab) and the second injection of 7.4 MBq 68Ga-Biotin with a 60 h interval, was then verified on the colon cancer-bearing mice. PET imaging was performed at 30, 90, 180 min to measure the standard uptake value and tumor to liver ratios. Cellular binding experiments and in vivo distribution showed that the conjugation of Avidin did not affect the affinity of Atezolizumab to PD-L1 antigen. Biotin was radio-labeled with 68Ga with radiolabeling efficiency of 70.5 ± 3.5% and purification was needed to increase the radiochemical purity. For PD-L1-positive tumors, SUVmax was 0.38 ± 0.06 in the Avidin-Atezolizumab pre-treated mice at 90 min; the tumor/liver ratios of pre-targeting group were 1.06 ± 0.19 and 0.97 ± 0.16 at 30 and 90 min, while the absence of pre-treatment of Avidin was of the lower ratios as 0.88 ± 0.01 and 0.54 ± 0.11 when 68Ga-Biotin served as the radiopharmaceutical as well. In conclusion, pre-targeting immunoPET strategy can elevate the target-to-nontarget ratio, decrease the blood background and shorten the interval between injection of radiopharmaceuticals and PET scan, providing a highly PD-L1-specific and sensitive imaging method for the detection of tumorous immune micro-environment.
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Affiliation(s)
- Zhongqiu Guo
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, 200433, China
| | - Lizhi Zhu
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, 200433, China
| | - Wen Xu
- Department of Radiology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Hubei, 441021, China
| | - Xiu Luo
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, 200433, China
| | - Hui Chen
- Department of Radiology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Hubei, 441021, China.
| | - Xiao Li
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, 200433, China; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
| | - Changjing Zuo
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, 200433, China.
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Li D, Li X, Zhao J, Tan F. Advances in nuclear medicine-based molecular imaging in head and neck squamous cell carcinoma. J Transl Med 2022; 20:358. [PMID: 35962347 PMCID: PMC9373390 DOI: 10.1186/s12967-022-03559-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 07/25/2022] [Indexed: 12/24/2022] Open
Abstract
Head and neck squamous cell carcinomas (HNSCCs) are often aggressive, making advanced disease very difficult to treat using contemporary modalities, such as surgery, radiation therapy, and chemotherapy. However, targeted therapy, e.g., cetuximab, an epidermal growth factor receptor inhibitor, has demonstrated survival benefit in HNSCC patients with locoregional failure or distant metastasis. Molecular imaging aims at various biomarkers used in targeted therapy, and nuclear medicine-based molecular imaging is a real-time and non-invasive modality with the potential to identify tumor in an earlier and more treatable stage, before anatomic-based imaging reveals diseases. The objective of this comprehensive review is to summarize recent advances in nuclear medicine-based molecular imaging for HNSCC focusing on several commonly radiolabeled biomarkers. The preclinical and clinical applications of these candidate imaging strategies are divided into three categories: those targeting tumor cells, tumor microenvironment, and tumor angiogenesis. This review endeavors to expand the knowledge of molecular biology of HNSCC and help realizing diagnostic potential of molecular imaging in clinical nuclear medicine.
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Affiliation(s)
- Danni Li
- Shanghai Fourth People's Hospital, and School of Medicine, Tongji University, Shanghai, China
| | - Xuran Li
- Shanghai Fourth People's Hospital, and School of Medicine, Tongji University, Shanghai, China
| | - Jun Zhao
- Department of Nuclear Medicine, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Fei Tan
- Shanghai Fourth People's Hospital, and School of Medicine, Tongji University, Shanghai, China. .,The Royal College of Surgeons in Ireland, Dublin, Ireland. .,The Royal College of Surgeons of England, London, UK.
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Li D, Li X, Yang J, Shi Z, Zhang L, Li R, Peng Y, Liu J, Zuo C. Nivolumab-DTPA-Based PD-1 Imaging Reveals Structural and Pathological Changes in Colorectal Carcinoma. Front Bioeng Biotechnol 2022; 10:839756. [PMID: 35237584 PMCID: PMC8883027 DOI: 10.3389/fbioe.2022.839756] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 01/21/2022] [Indexed: 12/26/2022] Open
Abstract
Programmed cell death protein 1 (PD-1) expression is considered a prognostic marker of tumor response to the immuno-blocking therapy. In this study, nivolumab was conjugated with diethylenetriamine pentaacetate (DTPA) via condensation reaction between amidogen and p-SCN-Bn-DTPA, which provided labeling sites for 99mTc4+ or Gd3+ ions. SPECT and magnetic resonance T1 weighted imaging (T1WI) analyses were performed on mouse models of colorectal carcinoma expressing humanized PD-1 antigen. Furthermore, PD-1 expression in intestinal tracks was assessed by immunohistochemistry, and then compared with the imageological findings. Nivolumab-DTPA was synthesized with varying molar ratios and was labeled with Gd or 99mTc with a chemical purity of 96.28 ± 1.16% and good stability. In SPECT images, lesions with high 99mTc-DTPA-nivolumab uptake and relatively clear background were shown at 6 h. Thereafter, the suspected intestinal thickening in Gd-free T1WI was observed at 2 h after the addition of Gd-DTPA-nivolumab. Notably, the results of both SPECT and T1WI analyses were consistent with the postmortem examination and immunohistochemistry results (for linear correlation with target to non-target ratios, R2 = 0.8038, p < 0.05). In conclusion, nivolumab-DTPA could act as a probe precursor for identifying PD-1-positive lesions, not only through integrating the advantages of immunohistochemistry and molecular imaging but also by providing a noninvasive method for monitoring systemic changes.
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Affiliation(s)
- Danni Li
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
| | - Xiao Li
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
| | - Jian Yang
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
| | - Zhang Shi
- Department of Radiology, Shanghai Changhai Hospital, Shanghai, China
| | - Lu Zhang
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
| | - Rou Li
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
| | - Ye Peng
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
| | - Jiajun Liu
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
- *Correspondence: Changjing Zuo, ; Jiajun Liu,
| | - Changjing Zuo
- Department of Nuclear Medicine, Shanghai Changhai Hospital, Shanghai, China
- *Correspondence: Changjing Zuo, ; Jiajun Liu,
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Zhao J, Wen X, Li T, Shi S, Xiong C, Wang YA, Li C. Concurrent Injection of Unlabeled Antibodies Allows Positron Emission Tomography Imaging of Programmed Cell Death Ligand 1 Expression in an Orthotopic Pancreatic Tumor Model. ACS OMEGA 2020; 5:8474-8482. [PMID: 32337408 PMCID: PMC7178348 DOI: 10.1021/acsomega.9b03731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 03/30/2020] [Indexed: 05/09/2023]
Abstract
Purpose: Among the treatment options for pancreatic ductal adenocarcinoma (PDAC) are antibodies against the programmed cell death receptor 1 (PD-1)/programmed cell death ligand 1 (PD-L1) pathway. Positron emission tomography (PET) has been successfully used to assess PD-1/PD-L1 signaling in subcutaneous tumor models, but orthotopic tumor models are increasingly being recognized as a better option to accurately recapitulate human disease. However, when PET radiotracers have high uptake in the liver and spleen, it can obscure signals from the adjacent pancreas, making visualization of the response in orthotopic pancreatic tumors technically challenging. In this study, we first investigated the impact of radioisotope chelators on the biodistribution of 64Cu-labeled anti-PD-1 and anti-PD-L1 antibodies and compared the distribution profiles of anti-PD-1 and anti-PD-L1 antibodies. We then tested the hypothesis that co-injection of unlabeled antibodies reduces uptake of 64Cu-labeled anti-PD-L1 antibodies in the spleen and thereby permits accurate delineation of orthotopic pancreatic tumors in mice. Procedures: We established subcutaneous and orthotopic mouse models of PDAC using KRAS* murine pancreatic cancer cells with a doxycycline-inducible mutation of KRASG12D. We then (1) compared the biodistribution of 64Cu-labeled anti-PD-1 with 2-(4-isothiocyanatobenzyl)-1,4,7,10-tetraazacyclododecane tetraacetic acid (p-SCN-Bn-DOTA) and 2-(4-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid (p-SCN-Bn-NOTA) used as the chelators in the orthotopic model; (2) compared the biodistribution of [64Cu]Cu-NOTA-anti-PD-1 and [64Cu]Cu-NOTA-anti-PD-L1 in the orthotopic model; and (3) imaged subcutaneous and orthotopic KRAS* tumors with [64Cu]Cu-NOTA-anti-PD-L1 with and without co-injection of unlabeled anti-PD-L1 as the blocking agent. Results: [64Cu]Cu-NOTA-anti-PD-L1 was a promising imaging probe. By co-injection of an excess of unlabeled anti-PD-L1, background signals of [64Cu]Cu-NOTA-anti-PD-L1 from the spleen were significantly reduced, leading to a clear delineation of orthotopic pancreatic tumors. Conclusions: Co-injection with unlabeled anti-PD-L1 is a useful method for PET imaging of PD-L1 expression in orthotopic pancreatic cancer models.
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Affiliation(s)
- Jun Zhao
- Department
of Cancer Systems Imaging and Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, 1881 East Road, 3SCRB4.3636, Houston, Texas 77054, United States
| | - Xiaoxia Wen
- Department
of Cancer Systems Imaging and Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, 1881 East Road, 3SCRB4.3636, Houston, Texas 77054, United States
| | - Tingting Li
- Department
of Cancer Systems Imaging and Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, 1881 East Road, 3SCRB4.3636, Houston, Texas 77054, United States
| | - Sixiang Shi
- Department
of Cancer Systems Imaging and Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, 1881 East Road, 3SCRB4.3636, Houston, Texas 77054, United States
| | - Chiyi Xiong
- Department
of Cancer Systems Imaging and Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, 1881 East Road, 3SCRB4.3636, Houston, Texas 77054, United States
| | - Yaoqi Alan Wang
- Department
of Cancer Systems Imaging and Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, 1881 East Road, 3SCRB4.3636, Houston, Texas 77054, United States
| | - Chun Li
- Department
of Cancer Systems Imaging and Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, 1881 East Road, 3SCRB4.3636, Houston, Texas 77054, United States
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An improved synthesis of piperlongumine and the preliminary imaging evaluation on tumor targeting. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07117-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Radiolabeling and biological evaluation of 125I-Necitumumab for EGFR-targeted SPECT imaging. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-019-06933-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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