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Feng H, Zhang H, Wang M, Vannam R, Wang H, Yan X, Ouyang W, Jia X, Fox JM, Li Z. Improving Tumor-to-Background Contrast through Hydrophilic Tetrazines: The Construction of 18 F-Labeled PET Agents Targeting Nonsmall Cell Lung Carcinoma. Chemistry 2020; 26:4690-4694. [PMID: 32030822 DOI: 10.1002/chem.202000028] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 02/04/2020] [Indexed: 02/04/2023]
Abstract
Bioorthogonal reactions have been widely used in the biomedical field. 18 F-TCO/Tetrazine ligation is the most reactive radiolabelled inverse electron demand Diels-Alder reaction, but its application had been limited due to modest contrast ratios of the resulting conjugates. Herein, we describe the use of hydrophilic tetrazines to improve tumor-to-background contrast of neurotensin receptor targeted PET agents. PET agents were constructed using a rapid Diels-Alder reaction of the radiolabeled trans-cyclooctene (18 F-sTCO) with neurotensin (NT) conjugates of a 3,6-diaryltetrazine, 3-methyl-6-aryltetrazine, and a derivative of 3,6-di(2-hydroxyethyl)tetrazine. Although cell binding assays demonstrated all agents have comparable binding affinity, the conjugate derived from 3,6-di(2-hydroxyethyl)tetrazine demonstrated the highest tumor to muscle contrast, followed by conjugates of the 3-methyl-6-aryltetrazine and 3,6-diaryltetrazine.
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Affiliation(s)
- Huijuan Feng
- Department of Nuclear Medicine, ZhuJiang Hospital of Southern Medical University, Guangzhou, Guangdong, 510280, P. R. China.,Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA
| | - He Zhang
- Department of Material Science and Engineering, University of Delaware, Newark, Delaware, 19716, USA
| | - Mengzhe Wang
- Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA
| | - Raghu Vannam
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware, 19716, USA
| | - Hui Wang
- Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA
| | - Xuefeng Yan
- Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA
| | - Wei Ouyang
- Department of Nuclear Medicine, ZhuJiang Hospital of Southern Medical University, Guangzhou, Guangdong, 510280, P. R. China
| | - Xinqiao Jia
- Department of Material Science and Engineering, University of Delaware, Newark, Delaware, 19716, USA
| | - Joseph M Fox
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware, 19716, USA
| | - Zibo Li
- Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA
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Robbins RA, Nelson KJ, Gossman GL, Rubinstein I. Neurotensin stimulates neutrophil adherence to bronchial epithelial cells in vitro. Life Sci 1995; 56:1353-9. [PMID: 8614258 DOI: 10.1016/0024-3205(95)00088-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Neutrophils and neuropeptides have both been implicated in airway inflammation. We hypothesized that neurotensin, a neuropeptide found in the airways, would stimulate neutrophil adherence to bronchial epithelial cells. Adherence was assessed using 51Cr-labelled human neutrophils added to confluent monolayers of bovine bronchial epithelial cells. Neurotensin added to bronchial epithelial cells produced a time-and concentration-dependent increase in adherence which was maximal at 4 h and 10(-10)M (17.6 +/- 1.4% vs. 6.1 +/- 0.4%, p < 0.01). Conversely, neurotensin stimulation of neutrophils induced a concentration-dependent and rapid ( < 5 min) increase in adherence which was also maximal at 10(-10)M (27.1 +/- 1.9% vs. 10.1 +/- 1.4%, p < 0.01). The effects were reproduced by the carboxy portion of the molecule. Anti-CD11a, -CD11b or -ICAM-1 antibodies significantly decreased the neurotensin-induced increase in adherence. These data suggest an important role for neurotensin in modulating airway inflammation.
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Affiliation(s)
- R A Robbins
- Research Service, Omaha VA Medical Center, NE, USA
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