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Chang KW, Chang PL, Tsai CJ, Tsai YJ, Wu PH, Lee HL, Lai YH, Wong CYO, Huang WS. The Titrated Mannitol Improved Central [ 99mTc] Tc TRODAT-1 Uptake in an Animal Model-A Clinically Feasible Application. Int J Mol Sci 2023; 24:ijms24043773. [PMID: 36835185 PMCID: PMC9959225 DOI: 10.3390/ijms24043773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/04/2023] [Accepted: 02/08/2023] [Indexed: 02/16/2023] Open
Abstract
[99mTc]Tc TRODAT-1 is a widely used single photon emission tomography (SPECT) radiopharmaceutical in Asian practice for early detection of central dopaminergic disorders. However, its imaging quality remains sub-optimal. To overcome this problem, mannitol, an osmotic agent was used to observe its effect on improving striatal [99mTc]Tc TRODAT-1 uptake in rat brain by titrated human dosages to investigate a clinically feasible way to improve human imaging quality. [99mTc]Tc TRODAT-1 synthesis and quality control were performed as described. Sprague-Dawley rats were used for this study. The animal in vivo nanoSPECT/CT and ex vivo autoradiography were employed to observe and verify the striatal [99mTc]Tc TRODAT-1 uptake in rat brains using clinically equivalent doses (i.e., 0, 1 and 2 mL groups, each n = 5) of mannitol (20% w/v, equivalent to 200 mg/mL) by an intravenous administration. Specific binding ratios (SBRs) were calculated to express the central striatal uptake in different experimental groups. In the NanoSPECT/CT imaging, the highest SBRs of striatal [99mTc]Tc TRODAT-1 were reached at 75-90 min post-injection. The averaged striatal SBRs were 0.85 ± 0.13 (2 mL normal saline, the control group), 0.94 ± 0.26 (1 mL mannitol group) and 1.36 ± 0.12 (2 mL mannitol group, p < 0.01 which were significantly different than the control as well as 1 mL mannitol groups (p < 0.05). The SBRs from ex vivo autoradiography also showed a comparable trend of the striatal [99mTc]Tc TRODAT-1 uptake in the 2 mL, 1 mL mannitol and the control groups (1.76 ± 0.52, 0.91 ± 0.29, and 0.21 ± 0.03, respectively, p < 0.05). No remarkable changes of vital signs were found in the mannitol groups and the controls. Pre-treated mannitol revealed a significant increase of the central striatal [99mTc]Tc TRODAT-1 uptake in a rat model which not only enabled us to perform pre-clinical studies of dopaminergic related disorders but also provided a potential way to further optimize image quality in clinical practice.
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Affiliation(s)
- Kang-Wei Chang
- Taipei Neuroscience Institute & Laboratory Animal Center, Taipei Medical University, Taipei 11048, Taiwan
| | - Po-Ling Chang
- Departments of Nuclear Medicine, Changhua Christian Hospital, Changhua 50006, Taiwan
| | - Chi-Jung Tsai
- Departments of Nuclear Medicine, Taipei Medical University Hospital, Taipei 11048, Taiwan
| | - Ya-Ju Tsai
- Departments of Nuclear Medicine, Taipei Medical University Hospital, Taipei 11048, Taiwan
| | - Ping-Hsiu Wu
- Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11048, Taiwan
- Department of Radiation Oncology, Taipei Medical University Hospital, Taipei 11048, Taiwan
| | - Hsin-Lun Lee
- Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11048, Taiwan
- Department of Radiation Oncology, Taipei Medical University Hospital, Taipei 11048, Taiwan
- Correspondence: (H.-L.L.); (W.-S.H.); Tel.: +886-2-2737-2181 (H.-L.L.); +886-2-2826-4400 (W.-S.H.)
| | - Yu-Hua Lai
- Department of Neurology, Cheng Hsin General Hospital, Taipei 11283, Taiwan
| | - Ching-Yee Oliver Wong
- Department of Radiology, University of Southern California, Los Angeles, CA 90007, USA
| | - Wen-Sheng Huang
- Departments of Nuclear Medicine, Taipei Medical University Hospital, Taipei 11048, Taiwan
- Department of Nuclear Medicine, Cheng Hsin General Hospital, Taipei 11283, Taiwan
- Correspondence: (H.-L.L.); (W.-S.H.); Tel.: +886-2-2737-2181 (H.-L.L.); +886-2-2826-4400 (W.-S.H.)
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Multi-Modal Synergistic 99mTc-TRODAT-1 SPECT and MRI for Evaluation of the Efficacy of Hyperbaric Oxygen Therapy in CO-Induced Delayed Parkinsonian and Non-Parkinsonian Syndromes. Antioxidants (Basel) 2022; 11:antiox11112289. [PMID: 36421475 PMCID: PMC9687447 DOI: 10.3390/antiox11112289] [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: 09/10/2022] [Revised: 11/11/2022] [Accepted: 11/14/2022] [Indexed: 11/22/2022] Open
Abstract
Background: Delayed neuropsychiatric syndrome (DNS) is characterized by motor dysfunction after acute carbon monoxide (CO) poisoning. We examined the relationship between dopamine transporter (DAT) loss using kit-based Tc-99m-TRODAT-1 (DAT single-photon emission-computed tomography (SPECT) radioligand) and globus pallidus necrosis on MRI, DAT availability before and after hyperbaric oxygen therapy (HBOT), and feasibility of Tc-99m-TRODAT-1 as an index for parkinsonian syndrome in CO poisoning. Methods: Twenty-one CO-intoxicated patients (mean ± SD age, 38.6 ± 11.4; range, 20−68 years) with DNS underwent Tc-99m-TRODAT-1 SPECT and MRI before HBOT and follow-up Tc-99m-TRODAT-1 SPECT to assess DAT recovery. Neurological examinations for Parkinsonism were performed after development of DNS. Results: Over 70% (15/21) of DNS patients showed globus pallidus necrosis on MRI. Significantly lower bilateral striatal DAT availability was associated with globus pallidus necrosis (p < 0.005). Moreover, 68.4% (13/19) of DNS subjects with Parkinsonian syndrome had lower bilateral striatal DAT availability vs. non-parkinsonian subjects pre- or post-HBOT. The SURs for both striata increased by ~11% post-HBOT in the Parkinsonian group; however, the left striatum presented a significantly higher DAT recovery rate than the right (*** p < 0.005). Conclusions: Coupled Tc-99m TRODAT-1 SPECT and MRI could assist evaluation of Parkinsonism risk and indicate DAT availability after HBOT in CO-poisoned patients with DNS.
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