Pub Date : 2025-11-01DOI: 10.1016/j.nucmedbio.2025.109134
Madhushan Serasinghe , Patrick Bokolo , Jack Lydon , James Guthrie , Steven Kelley , D. Scott Wilbur , Yawen Li , Dmitri Medvedev , Cathy Cutler , Carolyn Anderson , Silvia Jurisson , Heather Hennkens
{"title":"Electroamalgamation-and Chromatography-Based Eu/Tb Separation Procedures as a Proof of Concept for Separating 155Tb from Alpha-Irradiated 153Eu","authors":"Madhushan Serasinghe , Patrick Bokolo , Jack Lydon , James Guthrie , Steven Kelley , D. Scott Wilbur , Yawen Li , Dmitri Medvedev , Cathy Cutler , Carolyn Anderson , Silvia Jurisson , Heather Hennkens","doi":"10.1016/j.nucmedbio.2025.109134","DOIUrl":"10.1016/j.nucmedbio.2025.109134","url":null,"abstract":"","PeriodicalId":19363,"journal":{"name":"Nuclear medicine and biology","volume":"150 ","pages":"Article 109134"},"PeriodicalIF":3.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145474077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01DOI: 10.1016/j.nucmedbio.2025.109182
Muhammad Otabashi, Paolo Novelli, Romaric Gérardy, Simon Cerfontaine, Laura Trump, Fabrice Morelle, Corentin Warnier
{"title":"Breakthrough in 11C methylation of biologically interesting molecules: the case of [11C]PiB","authors":"Muhammad Otabashi, Paolo Novelli, Romaric Gérardy, Simon Cerfontaine, Laura Trump, Fabrice Morelle, Corentin Warnier","doi":"10.1016/j.nucmedbio.2025.109182","DOIUrl":"10.1016/j.nucmedbio.2025.109182","url":null,"abstract":"","PeriodicalId":19363,"journal":{"name":"Nuclear medicine and biology","volume":"150 ","pages":"Article 109182"},"PeriodicalIF":3.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145474110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01DOI: 10.1016/j.nucmedbio.2025.109129
Fraser Edgar , Lisa Duff , Emma Brown , Gavin Brown , Dmitry Soloviev , David Lewis
{"title":"The Development of a Radiotracer Library for the Investigation of Cancer Cachexia with Positron Emission Tomography","authors":"Fraser Edgar , Lisa Duff , Emma Brown , Gavin Brown , Dmitry Soloviev , David Lewis","doi":"10.1016/j.nucmedbio.2025.109129","DOIUrl":"10.1016/j.nucmedbio.2025.109129","url":null,"abstract":"","PeriodicalId":19363,"journal":{"name":"Nuclear medicine and biology","volume":"150 ","pages":"Article 109129"},"PeriodicalIF":3.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145474162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Translocator protein 18 kDa (TSPO) is a biomarker for neuroinflammation, and [18F]FEDAC was developed as a clinically usable radioligand for its imaging. Here, quantitative PET analyses of [18F]FEDAC in the brain of transient middle cerebral artery occlusion (tMCAO) rats were conducted for the first time.
Methods
Quantitative PET analysis was performed on rats subjected to tMCAO, with blood sampling also conducted as part of the study. To estimate the kinetic parameters of [18F]FEDAC, two-tissue compartment model (2TCM) and simplified reference tissue model (SRTM) analyses were conducted.
Results
The input rate (K1) and distribution volume (VT) (a macroparameter consisting of the K1–k4 rate constants from 2TCM analysis) of [18F]FEDAC in the ipsilateral area of tMCAO rats were 0.38 ± 0.19 mL/cm3/min and 5.4 ± 2.7 mL/cm3, respectively, which are roughly twice as high as those in the contralateral area. These results strongly suggest that ipsilateral binding potential (BPND), a quantitative index derived from the VT ratio with respect to the reference region, depends not only on the binding of [18F]FEDAC to TSPO, but also on increases in the input rate from blood. Therefore, in SRTM analyses, we corrected apparent BPND using R1, an index for probe delivery. In validation studies, SRTM analysis with the corrected BPND (corBPND), using the cerebellum as a reference, showed a high correlation with direct BPND (k3/k4) in 2TCM analyses.
Conclusion
The acquisition of quantitative PET images of TSPO distribution in the tMCAO rat brain was successfully achieved by scaling with corBPND.
{"title":"Estimation of the binding potential of the PET ligand [18F]FEDAC to translocator protein 18 kDa (TSPO) in the brain of experimental stroke model rats","authors":"Tomoteru Yamasaki , Yiding Zhang , Wakana Mori , Katsushi Kumata , Hidekatsu Wakizaka , Daisuke Arashi , Yusuke Kurihara , Masanao Ogawa , Nobuki Nengaki , Masayuki Fujinaga , Ming-Rong Zhang","doi":"10.1016/j.nucmedbio.2025.109579","DOIUrl":"10.1016/j.nucmedbio.2025.109579","url":null,"abstract":"<div><h3>Purpose</h3><div>Translocator protein 18 kDa (TSPO) is a biomarker for neuroinflammation, and [<sup>18</sup>F]FEDAC was developed as a clinically usable radioligand for its imaging. Here, quantitative PET analyses of [<sup>18</sup>F]FEDAC in the brain of transient middle cerebral artery occlusion (tMCAO) rats were conducted for the first time.</div></div><div><h3>Methods</h3><div>Quantitative PET analysis was performed on rats subjected to tMCAO, with blood sampling also conducted as part of the study. To estimate the kinetic parameters of [<sup>18</sup>F]FEDAC, two-tissue compartment model (2TCM) and simplified reference tissue model (SRTM) analyses were conducted.</div></div><div><h3>Results</h3><div>The input rate (<em>K</em><sub>1</sub>) and distribution volume (<em>V</em><sub>T</sub>) (a macroparameter consisting of the <em>K</em><sub>1</sub>–<em>k</em><sub>4</sub> rate constants from 2TCM analysis) of [<sup>18</sup>F]FEDAC in the ipsilateral area of tMCAO rats were 0.38 ± 0.19 mL/cm<sup>3</sup>/min and 5.4 ± 2.7 mL/cm<sup>3</sup>, respectively, which are roughly twice as high as those in the contralateral area. These results strongly suggest that ipsilateral binding potential (BP<sub>ND</sub>), a quantitative index derived from the <em>V</em><sub>T</sub> ratio with respect to the reference region, depends not only on the binding of [<sup>18</sup>F]FEDAC to TSPO, but also on increases in the input rate from blood. Therefore, in SRTM analyses, we corrected apparent BP<sub>ND</sub> using <em>R</em>1, an index for probe delivery. In validation studies, SRTM analysis with the corrected BP<sub>ND</sub> (corBP<sub>ND</sub>), using the cerebellum as a reference, showed a high correlation with direct BP<sub>ND</sub> (<em>k</em><sub>3</sub>/<em>k</em><sub>4</sub>) in 2TCM analyses.</div></div><div><h3>Conclusion</h3><div>The acquisition of quantitative PET images of TSPO distribution in the tMCAO rat brain was successfully achieved by scaling with corBP<sub>ND</sub>.</div></div>","PeriodicalId":19363,"journal":{"name":"Nuclear medicine and biology","volume":"150 ","pages":"Article 109579"},"PeriodicalIF":3.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145466618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}