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Pakula RJ, Raffel DM, Koeppe RA, Winton WP, Stauff J, Bohnen NI, Albin RL, Scott PJH, Shao X. Automated production of [ 11C]butyrate for keto body PET imaging. Nucl Med Biol 2023; 116-117:108315. [PMID: 36680983 PMCID: PMC10053181 DOI: 10.1016/j.nucmedbio.2023.108315] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/07/2022] [Accepted: 01/02/2023] [Indexed: 01/15/2023]
Abstract
The report describes an updated, fully automated method for the production of [11C]butyrate, validated for use in clinical studies. A commercially available GE Tracerlab FXM synthesis module was reconfigured to allow for air-free introduction of n-propyl magnesium chloride and to incorporate Sep-Pak cartridges to simplify and shorten the purification process, as compared to purifying the product using traditional HPLC. The method takes 20 min from end-of-bombardment and reliably produces injectable doses of [11C]butyrate (8029 ± 1628 MBq (217 ± 44 mCi), 14 % radiochemical yield based on [11C]CO2, non-decay corrected) in high radiochemical purity (>97 %), n = 3. With radiotracer in hand, PET scans of rats confirmed uptake of the radiopharmaceutical in the brain. Rat biodistribution data was obtained and used in conjunction with OLINDA software to determine an estimated human total body effective dose of 3.20 × 10-3 mSv/MBq (1.19 × 10-2 rem/mCi), along with preliminary rodent PET imaging that confirmed brain uptake. Lastly, our first human [11C]butyrate PET studies using a dynamic bolus injection technique (n = 5), with a graphical Logan analysis using a white matter reference region, confirmed good radiotracer uptake in the brain and with relatively more prominent uptake in the cerebellar hemispheres, vermis, cingulum cortex and the thalami.
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Affiliation(s)
- Ryan J Pakula
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - David M Raffel
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Robert A Koeppe
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Wade P Winton
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Jenelle Stauff
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Nicolaas I Bohnen
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America; Department of Neurology, University of Michigan, Ann Arbor, MI 48109, United States of America; Neurology Service and Geriatrics Research, Education, and Clinical Center, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, MI 48109, United States of America; University of Michigan, Morris K. Udall Parkinson's Disease Research Center of Excellence, Ann Arbor, MI 48109, United States of America; University of Michigan, Parkinson's Foundation Research Center of Excellence, Ann Arbor, MI, 48109, United States of America
| | - Roger L Albin
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, United States of America; Neurology Service and Geriatrics Research, Education, and Clinical Center, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, MI 48109, United States of America; University of Michigan, Morris K. Udall Parkinson's Disease Research Center of Excellence, Ann Arbor, MI 48109, United States of America; University of Michigan, Parkinson's Foundation Research Center of Excellence, Ann Arbor, MI, 48109, United States of America
| | - Peter J H Scott
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America.
| | - Xia Shao
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109, United States of America.
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