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Yagishita A, Katsuragawa M, Takeda S, Shirakami Y, Ooe K, Toyoshima A, Takahashi T, Watabe T. Development and Utility of an Imaging System for Internal Dosimetry of Astatine-211 in Mice. Bioengineering (Basel) 2023; 11:25. [PMID: 38247903 PMCID: PMC11154565 DOI: 10.3390/bioengineering11010025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/21/2023] [Accepted: 12/21/2023] [Indexed: 01/23/2024] Open
Abstract
In targeted radionuclide therapy, determining the absorbed dose of the ligand distributed to the whole body is vital due to its direct influence on therapeutic and adverse effects. However, many targeted alpha therapy drugs present challenges for in vivo quantitative imaging. To address this issue, we developed a planar imaging system equipped with a cadmium telluride semiconductor detector that offers high energy resolution. This system also comprised a 3D-printed tungsten collimator optimized for high sensitivity to astatine-211, an alpha-emitting radionuclide, and adequate spatial resolution for mouse imaging. The imager revealed a spectrum with a distinct peak for X-rays from astatine-211 owing to the high energy resolution, clearly distinguishing these X-rays from the fluorescent X-rays of tungsten. High collimator efficiency (4.5 × 10-4) was achieved, with the maintenance of the spatial resolution required for discerning mouse tissues. Using this system, the activity of astatine-211 in thyroid cancer tumors with and without the expression of the sodium iodide symporter (K1-NIS/K1, respectively) was evaluated through in vivo imaging. The K1-NIS tumors had significantly higher astatine-211 activity (sign test, p = 0.031, n = 6) and significantly decreased post-treatment tumor volume (Student's t-test, p = 0.005, n = 6). The concurrent examination of intratumor drug distribution and treatment outcome could be performed with the same mice.
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Affiliation(s)
- Atsushi Yagishita
- Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa 277-8583, Japan; (M.K.); (S.T.); (T.T.)
| | - Miho Katsuragawa
- Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa 277-8583, Japan; (M.K.); (S.T.); (T.T.)
| | - Shin’ichiro Takeda
- Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa 277-8583, Japan; (M.K.); (S.T.); (T.T.)
| | - Yoshifumi Shirakami
- Institute for Radiation Sciences, Osaka University, 1-1, Yamadaoka, Suita, Osaka 565-0871, Japan; (Y.S.); (K.O.); (A.T.); (T.W.)
| | - Kazuhiro Ooe
- Institute for Radiation Sciences, Osaka University, 1-1, Yamadaoka, Suita, Osaka 565-0871, Japan; (Y.S.); (K.O.); (A.T.); (T.W.)
| | - Atsushi Toyoshima
- Institute for Radiation Sciences, Osaka University, 1-1, Yamadaoka, Suita, Osaka 565-0871, Japan; (Y.S.); (K.O.); (A.T.); (T.W.)
| | - Tadayuki Takahashi
- Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa 277-8583, Japan; (M.K.); (S.T.); (T.T.)
| | - Tadashi Watabe
- Institute for Radiation Sciences, Osaka University, 1-1, Yamadaoka, Suita, Osaka 565-0871, Japan; (Y.S.); (K.O.); (A.T.); (T.W.)
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