Synthesis of [I]iodoDPA-713: A new probe for imaging inflammation |
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Authors: | Haofan Wang Tomas R Guilarte Martin G Pomper |
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Institution: | a Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins Medical Institutions, 1550 Orleans Street, Baltimore, MD 21231, USA b Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA |
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Abstract: | 125I]IodoDPA-713 125I]1, which targets the translocator protein (TSPO, 18 kDa), was synthesized in seven steps from methyl-4-methoxybenzoate as a tool for quantification of inflammation in preclinical models. Preliminary in vitro autoradiography and in vivo small animal imaging were performed using 125I]1 in a neurotoxicant-treated rat and in a murine model of lung inflammation, respectively. The radiochemical yield of 125I]1 was 44 ± 6% with a specific radioactivity of 51.8 GBq/μmol (1400 mCi/μmol) and >99% radiochemical purity. Preliminary studies showed that 125I]1 demonstrated increased specific binding to TSPO in a neurotoxicant-treated rat and increased radiopharmaceutical uptake in the lungs of an experimental inflammation model of lung inflammation. Compound 125I]1 is a new, convenient probe for preclinical studies of TSPO activity. |
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Keywords: | TSPO translocator protein [125I]iodoDPA-713 N N-diethyl-2-[2-(3-[125I]iodo-4-methoxyphenyl)-5 7-dimethylpyrazolo[1 5-a]pyrimidin-3-yl]acetamide PK11195 N-butan-2-yl-1-(2-chlorophenyl)-N-methylisoquinoline-3-carboxamide SPECT single photon emission computed tomography |
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