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Investigating the shared genetic architecture of osteoarthritis and frailty: a genome-wide cross-trait analysis.
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-15 eCollection Date: 2024-01-01 DOI: 10.62347/BLXC1352
Honghui Guo, Yanjing Chen, Xinlu Zhang, Hong Xiang, Xin Xiang, Xingdou Chen, Wenjie Fu, Yunhua Wang, Xiaowei Ma

Observational studies suggest a link between osteoarthritis (OA) and frailty, but the shared genetic architecture and causal relationships remain unclear. We analyzed X-ray and 18F-FDG PET/CT images in frail and non-frail individuals and conducted genetic correlation analyses using Linkage Disequilibrium Score Regression (LDSC) based on recent Genome-Wide Association Studies (GWAS) for OA and frailty. We identified pleiotropic single-nucleotide polymorphisms (SNPs) through Cross-Phenotype Association (CPASSOC) and Colocalization (COLOC) analyses and investigated genetic overlaps using Multi-marker Analysis of GenoMic Annotation (MAGMA). Transcriptome-wide association studies (TWAS) were conducted to analyze pleiotropic gene expression, and Mendelian Randomization (MR) was used to assess causal relationships between OA and frailty. Frail individuals showed more severe OA on X-ray (67% vs. 31%, P ≤ 0.01) and higher SUVmax on 18F-FDG PET/CT (4.1 vs. 3.6, P < 0.05) compared to non-frail individuals. Genetic correlation between frailty and OA was significant (rg = 0.532, P = 4.230E-88). Cross-trait analyses identified 42 genomic loci and 138 genes shared between the conditions. COLOC analysis revealed 2 pleiotropic loci, while TWAS identified 27 significant shared genetic expressions in whole blood and musculoskeletal tissue. Bidirectional MR indicated that OA increases the risk of frailty (IVW: beta: 0.13, P = 1.52E-08) and vice versa (IVW: beta: 0.73, P = 1.66E-04). Frail individuals exhibit more severe imaging features of OA. The shared genetic basis between OA and frailty suggests an intrinsic link, providing new insights into the relationship between these conditions.

{"title":"Investigating the shared genetic architecture of osteoarthritis and frailty: a genome-wide cross-trait analysis.","authors":"Honghui Guo, Yanjing Chen, Xinlu Zhang, Hong Xiang, Xin Xiang, Xingdou Chen, Wenjie Fu, Yunhua Wang, Xiaowei Ma","doi":"10.62347/BLXC1352","DOIUrl":"https://doi.org/10.62347/BLXC1352","url":null,"abstract":"<p><p>Observational studies suggest a link between osteoarthritis (OA) and frailty, but the shared genetic architecture and causal relationships remain unclear. We analyzed X-ray and <sup>18</sup>F-FDG PET/CT images in frail and non-frail individuals and conducted genetic correlation analyses using Linkage Disequilibrium Score Regression (LDSC) based on recent Genome-Wide Association Studies (GWAS) for OA and frailty. We identified pleiotropic single-nucleotide polymorphisms (SNPs) through Cross-Phenotype Association (CPASSOC) and Colocalization (COLOC) analyses and investigated genetic overlaps using Multi-marker Analysis of GenoMic Annotation (MAGMA). Transcriptome-wide association studies (TWAS) were conducted to analyze pleiotropic gene expression, and Mendelian Randomization (MR) was used to assess causal relationships between OA and frailty. Frail individuals showed more severe OA on X-ray (67% vs. 31%, P ≤ 0.01) and higher SUVmax on <sup>18</sup>F-FDG PET/CT (4.1 vs. 3.6, P < 0.05) compared to non-frail individuals. Genetic correlation between frailty and OA was significant (rg = 0.532, P = 4.230E-88). Cross-trait analyses identified 42 genomic loci and 138 genes shared between the conditions. COLOC analysis revealed 2 pleiotropic loci, while TWAS identified 27 significant shared genetic expressions in whole blood and musculoskeletal tissue. Bidirectional MR indicated that OA increases the risk of frailty (IVW: beta: 0.13, P = 1.52E-08) and vice versa (IVW: beta: 0.73, P = 1.66E-04). Frail individuals exhibit more severe imaging features of OA. The shared genetic basis between OA and frailty suggests an intrinsic link, providing new insights into the relationship between these conditions.</p>","PeriodicalId":7572,"journal":{"name":"American journal of nuclear medicine and molecular imaging","volume":"14 5","pages":"316-326"},"PeriodicalIF":2.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11578813/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142708879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radiosynthesis and preclinical evaluation of a carbon-11 labeled PET ligand for imaging metabotropic glutamate receptor 7.
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-15 eCollection Date: 2024-01-01 DOI: 10.62347/PUAI9230
Yinlong Li, Zhiwei Xiao, Wakana Mori, Jiyun Sun, Tomoteru Yamasaki, Jian Rong, Masayuki Fujinaga, Jiahui Chen, Katsushi Kumata, Chunyu Zhao, Yiding Zhang, Thomas L Collier, Kuan Hu, Lin Xie, Xin Zhou, Wei Zhang, Zhendong Song, Yabiao Gao, Zhenkun Sun, Kuo Zhang, Jimmy S Patel, Chongzhao Ran, Ahmad Chaudhary, Douglas J Sheffler, Nicholas Dp Cosford, Linqi Zhang, Chuangyan Zhai, Ahmed Haider, Hongjie Yuan, Ming-Rong Zhang, Steven H Liang

Metabotropic glutamate receptor 7 (mGlu7) is a G protein-coupled receptor that is preferentially found in the active zone of neurotransmitter release in the central nervous system (CNS). mGlu7 plays a vital role in memory, learning, and neuronal development, rendering it a potential target for treating epilepsy, depression, and anxiety. The development of noninvasive imaging ligands targeting mGlu7 could help elucidate the functional significance of mGlu7 and accelerate drug discovery for neurological and psychiatric disorders. In this report, a novel carbon-11 labeled positron emission tomography (PET) tracer designated [11C]18 (codenamed MG7-2109) was synthesized via 11C-methylation in 23% decay-corrected radiochemical yield (RCY). In vitro serum stability, serum protein binding, in vitro autoradiography and ex vivo biodistribution studies of [11C]18 were conducted. Preliminary PET imaging results revealed a homogeneous distribution of [11C]18 and rapid clearance in rodent brains. This study provides valuable insights into the development of mGlu7-targeted PET tracer based on an isoxazolo(5,4-c)pyridine scaffold.

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引用次数: 0
Emerging role of electrochemistry in radiochemical separation of medically important radiometals: state of the art. 电化学在重要医用放射性金属的放射化学分离中的新作用:最新技术。
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-15 eCollection Date: 2024-01-01 DOI: 10.62347/XITW6701
Sourav Patra, Sudipta Chakraborty, Rubel Chakravarty

Electrochemical separation technology has brought a renaissance in the field of nuclear medicine towards obtaining clinical-grade radiometals for preparation of a wide variety of radiopharmaceuticals. This article is a comprehensive summary of the electrochemical processes developed for the separation of radiometals that could be used for diagnostic or therapeutic applications in nuclear medicine. For using electrochemistry as a tool for the separation of radiometals, intricate knowledge is essential to understand the basic parameters of electrochemical separation processes which include applied potential, selection of electrolyte, choice of the electrode, the temperature of the electrolyte, pH of the electrolyte and time of electrolysis. The advantages of the electrochemical separation approach over the other conventional methodologies such as solvent extraction, column chromatography, sublimation, etc., have also been discussed. The latest research and development from our laboratory on electrochemical methodologies developed for separation of 90Y from 90Sr, 188Re from 188W, 99mTc from 99Mo, 47Sc from 46Ca, 45Ca from 46Sc,153Sm from 154Eu, 169Er from 169Yb, 177Lu from Yb and 132/135La from Ba have been described. In all the cases, the final product is obtained either in a 'no-carrier-added' (NCA) form or free from inextricable impurities and thus found suitable for formulation of radiopharmaceuticals.

电化学分离技术为核医学领域带来了一场复兴,旨在获得临床级放射性金属,用于制备各种放射性药物。本文全面总结了为分离可用于核医学诊断或治疗的放射性金属而开发的电化学过程。要利用电化学作为分离放射性金属的工具,了解电化学分离过程的基本参数至关重要,这些参数包括应用电位、电解质的选择、电极的选择、电解质的温度、电解质的 pH 值和电解时间。此外,还讨论了电化学分离方法相对于其他传统方法(如溶剂萃取、柱层析、升华等)的优势。此外,还介绍了我们实验室最新研发的电化学方法,用于从 90Sr 中分离 90Y、从 188W 中分离 188Re、从 99Mo 中分离 99mTc、从 46Ca 中分离 47Sc、从 46Sc 中分离 45Ca、从 154Eu 中分离 153Sm、从 169Yb 中分离 169Er、从 Yb 中分离 177Lu 以及从 Ba 中分离 132/135La。在所有这些案例中,最终产品都是以 "无载体添加"(NCA)的形式或不含杂质的形式获得的,因此适用于配制放射性药物。
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引用次数: 0
18F-FDG-PET and other imaging modalities in the diagnosis and management of inflammatory bowel disease.
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-15 eCollection Date: 2024-01-01 DOI: 10.62347/YXQT2560
Abhijit Bhattaru, Anish Pundyavana, William Raynor, Sree Chinta, Thomas J Werner, Abass Alavi

Inflammatory bowel disease (IBD), which encompasses ulcerative colitis (UC) and Crohn's disease (CD), is a chronic inflammatory condition of the gastrointestinal (GI) tract that presents complex diagnostic and management challenges. Early detection and treatment of IBD is paramount, as IBD can present with serious complications, including bowel perforation, arthritis, and colorectal cancer. Most forms of diagnosis and therapeutic management, like ileocolonoscopy and upper endoscopy are highly invasive and require extensive preparation at great discomfort to patients. 18F-fluorodeoxyglucose-positron emission tomography (18F-FDG-PET) imaging can be a potential solution to the current limitations in imaging for IBD. This review explores the utility and limitations of various imaging modalities used to detect and manage IBD including ileocolonoscopy, magnetic resonance enterography (MRE), gastrointestinal ultrasound (IUS), and 18F-FDG-PET/computed tomography (18F-FDG-PET/CT) and magnetic resonance imaging (18F-FDG-PET/MR). This review has an emphasis on PET imaging and highlights its benefits in detection, management, and monitoring therapeutic response of UC and CD.

炎症性肠病(IBD)包括溃疡性结肠炎(UC)和克罗恩病(CD),是胃肠道(GI)的一种慢性炎症,给诊断和管理带来了复杂的挑战。早期发现和治疗 IBD 至关重要,因为 IBD 可引起严重的并发症,包括肠穿孔、关节炎和结直肠癌。大多数诊断和治疗方法,如回肠结肠镜检查和上内镜检查,都具有高度创伤性,需要进行大量准备工作,患者会感到非常不适。18F-氟脱氧葡萄糖-正电子发射断层扫描(18F-FDG-PET)成像可能是解决目前 IBD 成像局限性的一种潜在方法。本综述探讨了用于检测和管理 IBD 的各种成像模式的效用和局限性,包括回结肠镜检查、磁共振肠造影 (MRE)、胃肠道超声 (IUS)、18F-FDG-PET/计算机断层扫描 (18F-FDG-PET/CT) 和磁共振成像 (18F-FDG-PET/MR)。本综述重点介绍 PET 成像,并强调其在 UC 和 CD 的检测、管理和治疗反应监测方面的优势。
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引用次数: 0
Evaluation of specific binding of [11C]TZ7774 to the receptor-interacting protein kinase 1 (RIPK1) in the brain.
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-15 eCollection Date: 2024-01-01 DOI: 10.62347/PAZG6300
Takayuki Sakai, Takashi Yamada, Hiroshi Ikenuma, Aya Ogata, Masanori Ichise, Saori Hattori, Junichiro Abe, Mari Tada, Akiyoshi Kakita, Masaaki Suzuki, Kengo Ito, Takashi Kato, Shinichi Imamura, Yasuyuki Kimura

Microglia, a type of immune cells of the central nervous system, play a critical role in the pathophysiology of neurodegenerative disorders including Alzheimer's disease (AD). Recently, efforts for drug discovery have focused on modifying the function of microglia to halt AD progression. One such effort targets a multifaceted kinase called receptor-interacting protein kinase 1 (RIPK1) that controls inflammation and cell death. Pharmaceutical inhibition of RIPK1 in microglia prevents their homeostatic status from transforming to disease-associated status. Thus, RIPK1 inhibitors can be a therapeutic agent for halting AD progression. Therefore, in vivo imaging of RIPK1 may be a useful biomarker of AD. Recently, a novel PET ligand, [11C]TZ7774, targeting RIPK1 was developed showing its ability to enter the brain and an increased uptake in the spleen of acute inflammation model mice. However, they have not yet shown direct evidence of specific binding of [11C]TZ7774 to RIPK1 in the brain. In this study, we replicated the synthesis of [11C]TZ7774 and examined its specific binding in the rat and human brain. Our studies with this ligand failed to detect sufficient specific binding of [11C]TZ7774 to RIPK1 in the brain neither by PET imaging with healthy and acute inflammation model rats, nor by autoradiography with healthy rat and human brain slices. Our results suggest that the RIPK1 ligand, [11C]TZ7774, is unlikely to be useful in humans. Future studies are warranted to develop more optimal radioligands for PET imaging of RIPK1.

{"title":"Evaluation of specific binding of [<sup>11</sup>C]TZ7774 to the receptor-interacting protein kinase 1 (RIPK1) in the brain.","authors":"Takayuki Sakai, Takashi Yamada, Hiroshi Ikenuma, Aya Ogata, Masanori Ichise, Saori Hattori, Junichiro Abe, Mari Tada, Akiyoshi Kakita, Masaaki Suzuki, Kengo Ito, Takashi Kato, Shinichi Imamura, Yasuyuki Kimura","doi":"10.62347/PAZG6300","DOIUrl":"https://doi.org/10.62347/PAZG6300","url":null,"abstract":"<p><p>Microglia, a type of immune cells of the central nervous system, play a critical role in the pathophysiology of neurodegenerative disorders including Alzheimer's disease (AD). Recently, efforts for drug discovery have focused on modifying the function of microglia to halt AD progression. One such effort targets a multifaceted kinase called receptor-interacting protein kinase 1 (RIPK1) that controls inflammation and cell death. Pharmaceutical inhibition of RIPK1 in microglia prevents their homeostatic status from transforming to disease-associated status. Thus, RIPK1 inhibitors can be a therapeutic agent for halting AD progression. Therefore, <i>in vivo</i> imaging of RIPK1 may be a useful biomarker of AD. Recently, a novel PET ligand, [<sup>11</sup>C]TZ7774, targeting RIPK1 was developed showing its ability to enter the brain and an increased uptake in the spleen of acute inflammation model mice. However, they have not yet shown direct evidence of specific binding of [<sup>11</sup>C]TZ7774 to RIPK1 in the brain. In this study, we replicated the synthesis of [<sup>11</sup>C]TZ7774 and examined its specific binding in the rat and human brain. Our studies with this ligand failed to detect sufficient specific binding of [<sup>11</sup>C]TZ7774 to RIPK1 in the brain neither by PET imaging with healthy and acute inflammation model rats, nor by autoradiography with healthy rat and human brain slices. Our results suggest that the RIPK1 ligand, [<sup>11</sup>C]TZ7774, is unlikely to be useful in humans. Future studies are warranted to develop more optimal radioligands for PET imaging of RIPK1.</p>","PeriodicalId":7572,"journal":{"name":"American journal of nuclear medicine and molecular imaging","volume":"14 5","pages":"345-350"},"PeriodicalIF":2.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11578809/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142708875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Normal-organ distribution of PSMA-targeting PET radiopharmaceutical 18F-flotufolastat: a post hoc analysis of the LIGHTHOUSE and SPOTLIGHT studies.
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-15 eCollection Date: 2024-01-01 DOI: 10.62347/INCG3525
Ross Penny, Benjamin Fongenie, Phillip Davis, James Sykes

Background: High-affinity radiohybrid PSMA-targeting radiopharmaceutical 18F-flotufolastat (18F-rhPSMA-7.3) is newly approved for diagnostic imaging of prostate cancer. Here, we conduct a post hoc analysis of two phase 3 studies to quantify 18F-flotufolastat uptake in a range of normal organs.

Methods: All 718 evaluable 18F-flotufolastat scans from LIGHTHOUSE and SPOTLIGHT were re-evaluated. Additionally, patients' medical records were reviewed and any patients with high tumor burden (PSA>20 ng/mL), altered biodistribution (e.g., chronic kidney disease), major anatomical changes to normal organs (e.g., nephrectomy), or any other history of cancer were excluded. A medical physicist defined volumes of interest over specific organs for evaluation of SUVmean and SUVpeak per PERCIST 1.0 criteria. Normally distributed data are reported as mean (SD) and non-normally distributed data as median (IQR). The co-efficient of variation (CoV; calculated as SD/mean for normally distributed data and IQR/median for non-normally distributed data) was used to quantify variability of SUV metrics.

Results: In total, scans from 546 patients (244 primary, 302 recurrent) were eligible for this analysis. All organs were considered to be normally distributed except for the bladder and spleen. In the liver, the mean SUVmean was 6.7 (SD 1.7), CoV 26%, while the bladder median SUVmean was 10.6 (IQR 11.9), CoV 112%. The mean SUVpeak in the liver was 8.2 (SD 2.1), CoV 26% and median SUVpeak in the bladder was 16.0 (IQR 18.5), CoV 116%.

Conclusions: Physiological 18F-flotufolastat uptake in normal organs was broadly consistent with other renally-cleared radiopharmaceuticals, which may have clinically significant implications when considering patient selection for radioligand therapy. Additionally, the bladder median SUVpeak for 18F-flotufolastat was lower than that previously reported for 68Ga-PSMA-11 and 18F-DCFPyL.

{"title":"Normal-organ distribution of PSMA-targeting PET radiopharmaceutical <sup>18</sup>F-flotufolastat: a post hoc analysis of the LIGHTHOUSE and SPOTLIGHT studies.","authors":"Ross Penny, Benjamin Fongenie, Phillip Davis, James Sykes","doi":"10.62347/INCG3525","DOIUrl":"https://doi.org/10.62347/INCG3525","url":null,"abstract":"<p><strong>Background: </strong>High-affinity radiohybrid PSMA-targeting radiopharmaceutical <sup>18</sup>F-flotufolastat (<sup>18</sup>F-rhPSMA-7.3) is newly approved for diagnostic imaging of prostate cancer. Here, we conduct a post hoc analysis of two phase 3 studies to quantify <sup>18</sup>F-flotufolastat uptake in a range of normal organs.</p><p><strong>Methods: </strong>All 718 evaluable <sup>18</sup>F-flotufolastat scans from LIGHTHOUSE and SPOTLIGHT were re-evaluated. Additionally, patients' medical records were reviewed and any patients with high tumor burden (PSA>20 ng/mL), altered biodistribution (e.g., chronic kidney disease), major anatomical changes to normal organs (e.g., nephrectomy), or any other history of cancer were excluded. A medical physicist defined volumes of interest over specific organs for evaluation of SUV<sub>mean</sub> and SUV<sub>peak</sub> per PERCIST 1.0 criteria. Normally distributed data are reported as mean (SD) and non-normally distributed data as median (IQR). The co-efficient of variation (CoV; calculated as SD/mean for normally distributed data and IQR/median for non-normally distributed data) was used to quantify variability of SUV metrics.</p><p><strong>Results: </strong>In total, scans from 546 patients (244 primary, 302 recurrent) were eligible for this analysis. All organs were considered to be normally distributed except for the bladder and spleen. In the liver, the mean SUV<sub>mean</sub> was 6.7 (SD 1.7), CoV 26%, while the bladder median SUV<sub>mean</sub> was 10.6 (IQR 11.9), CoV 112%. The mean SUV<sub>peak</sub> in the liver was 8.2 (SD 2.1), CoV 26% and median SUV<sub>peak</sub> in the bladder was 16.0 (IQR 18.5), CoV 116%.</p><p><strong>Conclusions: </strong>Physiological <sup>18</sup>F-flotufolastat uptake in normal organs was broadly consistent with other renally-cleared radiopharmaceuticals, which may have clinically significant implications when considering patient selection for radioligand therapy. Additionally, the bladder median SUV<sub>peak</sub> for <sup>18</sup>F-flotufolastat was lower than that previously reported for <sup>68</sup>Ga-PSMA-11 and <sup>18</sup>F-DCFPyL.</p>","PeriodicalId":7572,"journal":{"name":"American journal of nuclear medicine and molecular imaging","volume":"14 5","pages":"337-344"},"PeriodicalIF":2.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11578810/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142708895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radiosynthesis and evaluation of a novel 18F-labeled tracer for PET imaging of glycogen synthase kinase 3.
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-15 eCollection Date: 2024-01-01 DOI: 10.62347/OBZS8887
Zhiwei Xiao, Yinlong Li, Ahmed Haider, Stefanie K Pfister, Jian Rong, Jiahui Chen, Chunyu Zhao, Xin Zhou, Zhendong Song, Yabiao Gao, Jimmy S Patel, Thomas L Collier, Chongzhao Ran, Chuangyan Zhai, Hongjie Yuan, Steven H Liang

Glycogen synthase kinase 3 (GSK3) is a multifunctional serine/threonine kinase family that regulates diverse biological processes including glucose metabolism, insulin activity and energy homeostasis. Dysregulation of GSK3 is implicated in the development of several diseases such as type 2 diabetes mellitus, Alzheimer's disease (AD), and various cancer types. In this study, we report the synthesis and evaluation of a novel positron emission tomography (PET) ligand compound 28 (codenamed [18F]GSK3-2209). The PET ligand [18F]28 was obtained via copper-mediated radiofluorination in more than 32% radiochemical yields, with high radiochemical purity and high molar activity. In vitro autoradiography studies in rodents demonstrated that this tracer exhibited a high specific binding to GSK3. Furthermore, PET imaging studies of [18F]28 revealed its ability to penetrate the blood-brain barrier (BBB).

糖原合酶激酶 3(GSK3)是一个多功能丝氨酸/苏氨酸激酶家族,它调控多种生物过程,包括葡萄糖代谢、胰岛素活性和能量平衡。GSK3 的失调与多种疾病的发生有关,如 2 型糖尿病、阿尔茨海默病(AD)和各种癌症。在这项研究中,我们报告了新型正电子发射断层扫描(PET)配体化合物 28(代号为 [18F]GSK3-2209)的合成和评估。PET 配体[18F]28 是通过铜介导的放射氟化反应获得的,放射化学收率超过 32%,具有高放射化学纯度和高摩尔活性。啮齿动物体外自显影研究表明,这种示踪剂与 GSK3 具有高度特异性结合。此外,[18F]28 的 PET 成像研究表明,它能够穿透血脑屏障(BBB)。
{"title":"Radiosynthesis and evaluation of a novel <sup>18</sup>F-labeled tracer for PET imaging of glycogen synthase kinase 3.","authors":"Zhiwei Xiao, Yinlong Li, Ahmed Haider, Stefanie K Pfister, Jian Rong, Jiahui Chen, Chunyu Zhao, Xin Zhou, Zhendong Song, Yabiao Gao, Jimmy S Patel, Thomas L Collier, Chongzhao Ran, Chuangyan Zhai, Hongjie Yuan, Steven H Liang","doi":"10.62347/OBZS8887","DOIUrl":"https://doi.org/10.62347/OBZS8887","url":null,"abstract":"<p><p>Glycogen synthase kinase 3 (GSK3) is a multifunctional serine/threonine kinase family that regulates diverse biological processes including glucose metabolism, insulin activity and energy homeostasis. Dysregulation of GSK3 is implicated in the development of several diseases such as type 2 diabetes mellitus, Alzheimer's disease (AD), and various cancer types. In this study, we report the synthesis and evaluation of a novel positron emission tomography (PET) ligand compound 28 (codenamed [<sup>18</sup>F]GSK3-2209). The PET ligand [<sup>18</sup>F]28 was obtained via copper-mediated radiofluorination in more than 32% radiochemical yields, with high radiochemical purity and high molar activity. <i>In vitro</i> autoradiography studies in rodents demonstrated that this tracer exhibited a high specific binding to GSK3. Furthermore, PET imaging studies of [<sup>18</sup>F]28 revealed its ability to penetrate the blood-brain barrier (BBB).</p>","PeriodicalId":7572,"journal":{"name":"American journal of nuclear medicine and molecular imaging","volume":"14 5","pages":"327-336"},"PeriodicalIF":2.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11578811/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142708899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Accurate brain pharmacokinetic parametric imaging using the blood input function extracted from the cavernous sinus. 利用从海绵窦提取的血液输入函数进行精确的大脑药物动力学参数成像。
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-08-25 eCollection Date: 2024-01-01 DOI: 10.62347/LSYG1380
Yafen Kang, Zixiang Chen, Zhuoyue Song, Yaping Wu, Zhenxing Huang, Yuxi Jin, Ting Zhang, Meiyun Wang, Zhanli Hu, Yang Yu

Brain pharmacokinetic parametric imaging based on dynamic positron emission tomography (PET) scan is valuable in the diagnosis of brain tumor and neurodegenerative diseases. For short-axis PET system, standard blood input function (BIF) of the descending aorta is not acquirable during the dynamic brain scan. BIF extracted from the intracerebral vascular is inaccurate, making the brain parametric imaging task challenging. This study introduces a novel technique tailored for brain pharmacokinetic parameter imaging in short-axis PET in which the head BIF (hBIF) is acquired from the cavernous sinus. The proposed method optimizes the hBIF within the Patlak model via data fitting, curve correction and Patlak graphical model rewriting. The proposed method was built and evaluated using dynamic PET datasets of 67 patients acquired by uEXPLORER PET/CT, among which 64 datasets were used for data fitting and model construction, and 3 were used for method testing; using cross-validation, a total of 15 patient datasets were finally used to test the model. The performance of the new method was evaluated via visual inspection, root-mean-square error (RMSE) measurements and VOI-based accuracy analysis using linear regression and Person's correlation coefficients (PCC). Compared to directly using the cavernous sinus BIF directly for parameter imaging, the new method achieves higher accuracy in parametric analysis, including the generation of Patlak plots closer to the standard plots, better visual effects and lower RMSE values in the Ki (P = 0.0012) and V (P = 0.0042) images. VOI-based analysis shows regression lines with slopes closer to 1 (P = 0.0019 for Ki ) and smaller intercepts (P = 0.0085 for V). The proposed method is capable of achieving accurate brain pharmacokinetic parametric imaging using cavernous sinus BIF with short-axis PET scan. This may facilitate the application of this imaging technology in the clinical diagnosis of brain diseases.

基于动态正电子发射断层扫描(PET)的脑药动学参数成像在诊断脑肿瘤和神经退行性疾病方面具有重要价值。对于短轴 PET 系统,在动态脑扫描过程中无法获得降主动脉的标准血液输入函数(BIF)。从脑内血管提取的 BIF 也不准确,因此脑参数成像任务具有挑战性。本研究介绍了一种为短轴 PET 脑药代动力学参数成像量身定制的新技术,即从海绵窦获取头部 BIF(hBIF)。该方法通过数据拟合、曲线校正和 Patlak 图形模型重写,在 Patlak 模型内优化 hBIF。利用uEXPLORER PET/CT获取的67名患者的动态PET数据集建立并评估了所提出的方法,其中64个数据集用于数据拟合和模型构建,3个数据集用于方法测试;通过交叉验证,最终共有15个患者数据集用于测试模型。通过目视检查、均方根误差(RMSE)测量以及使用线性回归和Person相关系数(PCC)进行基于VOI的准确性分析,对新方法的性能进行了评估。与直接使用海绵窦 BIF 进行参数成像相比,新方法的参数分析准确度更高,包括生成的 Patlak 图更接近标准图,视觉效果更好,Ki(P = 0.0012)和 V(P = 0.0042)图像的 RMSE 值更低。基于 VOI 的分析显示,回归线的斜率更接近 1(Ki 的 P = 0.0019),截距更小(V 的 P = 0.0085)。所提出的方法能够利用海绵窦 BIF 和短轴 PET 扫描实现精确的脑药代动力学参数成像。这将有助于该成像技术在脑疾病临床诊断中的应用。
{"title":"Accurate brain pharmacokinetic parametric imaging using the blood input function extracted from the cavernous sinus.","authors":"Yafen Kang, Zixiang Chen, Zhuoyue Song, Yaping Wu, Zhenxing Huang, Yuxi Jin, Ting Zhang, Meiyun Wang, Zhanli Hu, Yang Yu","doi":"10.62347/LSYG1380","DOIUrl":"10.62347/LSYG1380","url":null,"abstract":"<p><p>Brain pharmacokinetic parametric imaging based on dynamic positron emission tomography (PET) scan is valuable in the diagnosis of brain tumor and neurodegenerative diseases. For short-axis PET system, standard blood input function (BIF) of the descending aorta is not acquirable during the dynamic brain scan. BIF extracted from the intracerebral vascular is inaccurate, making the brain parametric imaging task challenging. This study introduces a novel technique tailored for brain pharmacokinetic parameter imaging in short-axis PET in which the head BIF (hBIF) is acquired from the cavernous sinus. The proposed method optimizes the hBIF within the Patlak model via data fitting, curve correction and Patlak graphical model rewriting. The proposed method was built and evaluated using dynamic PET datasets of 67 patients acquired by uEXPLORER PET/CT, among which 64 datasets were used for data fitting and model construction, and 3 were used for method testing; using cross-validation, a total of 15 patient datasets were finally used to test the model. The performance of the new method was evaluated via visual inspection, root-mean-square error (RMSE) measurements and VOI-based accuracy analysis using linear regression and Person's correlation coefficients (PCC). Compared to directly using the cavernous sinus BIF directly for parameter imaging, the new method achieves higher accuracy in parametric analysis, including the generation of Patlak plots closer to the standard plots, better visual effects and lower RMSE values in the <i>K<sub>i</sub></i> (<i>P</i> = 0.0012) and <i>V</i> (<i>P</i> = 0.0042) images. VOI-based analysis shows regression lines with slopes closer to 1 (<i>P</i> = 0.0019 for <i>K<sub>i</sub></i> ) and smaller intercepts (<i>P</i> = 0.0085 for <i>V</i>). The proposed method is capable of achieving accurate brain pharmacokinetic parametric imaging using cavernous sinus BIF with short-axis PET scan. This may facilitate the application of this imaging technology in the clinical diagnosis of brain diseases.</p>","PeriodicalId":7572,"journal":{"name":"American journal of nuclear medicine and molecular imaging","volume":"14 4","pages":"272-281"},"PeriodicalIF":2.0,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11411194/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142279061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radiomics-based model for prediction of TGF-β1 expression in head and neck squamous cell carcinoma. 基于放射组学的头颈部鳞状细胞癌 TGF-β1 表达预测模型
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-08-25 eCollection Date: 2024-01-01 DOI: 10.62347/JMKV7596
Kai Qin, Chen Gong, Yi Cheng, Li Li, Chengxia Liu, Feng Yang, Jie Rao, Qianxia Li

Objective: To explore the connection between TGF-β1 expression and the survival of patients with head and neck squamous cell carcinoma (HNSCC), as well as whether non-invasive CT-based Radiomics can predict TGF-β1 expression in HNSCC patients.

Methods: Data on transcriptional profiling and clinical information were acquired from the TCGA database and subsequently categorized based on the TGF-β1 expression cutoff value. Based on the completeness of enhanced arterial phase CT scans, 139 HNSCC patients were selected. The PyRadiomics package was used to extract radiomic features, and the 3D Slicer software was used for image segmentation. Using the mRMR_RFE and Repeat LASSO algorithms, the optimal features for establishing the corresponding gradient enhancement prediction models were identified.

Results: A survival analysis was performed on 483 patients, who were divided into two groups based on the TGF-β1 expression cut-off. The Kaplan-Meier curve indicated that TGF-β1 was a significant independent risk factor that reduced patient survival. To construct gradient enhancement prediction models, we used the mRMR_RFE algorithm and the Repeat_LASSO algorithm to obtain two features (glrlm and ngtdm) and three radiation features (glrlm, first order_10percentile, and gldm). In both the training and validation cohorts, the two established models demonstrated strong predictive potential. Furthermore, there was no statistically significant difference in the calibration curve, DCA diagram, or AUC values between the mRMR_RFE_GBM model and the LASSO_GBM model, suggesting that both models fit well.

Conclusion: Based on these findings, TGF-β1 was shown to be significantly associated with a poor prognosis and to be a potential risk factor for HNSCC. Furthermore, by employing the mRMR_RFE_GBM and Repeat_LASSO_GBM models, we were able to effectively predict TGF-β1 expression levels in HNSCC through non-invasive CT-based Radiomics.

目的探讨TGF-β1表达与头颈部鳞状细胞癌(HNSCC)患者生存期的关系,以及基于CT的无创放射组学能否预测HNSCC患者的TGF-β1表达:方法:从 TCGA 数据库中获取转录谱分析数据和临床信息,然后根据 TGF-β1 表达截断值进行分类。根据增强动脉期CT扫描的完整性,选择了139例HNSCC患者。使用 PyRadiomics 软件包提取放射学特征,并使用 3D Slicer 软件进行图像分割。利用 mRMR_RFE 和 Repeat LASSO 算法,确定了建立相应梯度增强预测模型的最佳特征:对 483 例患者进行了生存分析,根据 TGF-β1 表达截断值将患者分为两组。Kaplan-Meier曲线显示,TGF-β1是降低患者生存率的重要独立风险因素。为了构建梯度增强预测模型,我们使用了 mRMR_RFE 算法和 Repeat_LASSO 算法,获得了两个特征(glrlm 和 ngtdm)和三个辐射特征(glrlm、first order_10percentile 和 gldm)。在训练组和验证组中,这两个已建立的模型都表现出很强的预测潜力。此外,mRMR_RFE_GBM 模型和 LASSO_GBM 模型的校准曲线、DCA 图或 AUC 值在统计学上没有显著差异,这表明这两个模型拟合良好:基于这些发现,TGF-β1 被证明与不良预后显著相关,是 HNSCC 的潜在风险因素。此外,通过使用 mRMR_RFE_GBM 和 Repeat_LASSO_GBM 模型,我们能够通过基于 CT 的无创放射组学有效预测 HNSCC 中 TGF-β1 的表达水平。
{"title":"Radiomics-based model for prediction of TGF-β1 expression in head and neck squamous cell carcinoma.","authors":"Kai Qin, Chen Gong, Yi Cheng, Li Li, Chengxia Liu, Feng Yang, Jie Rao, Qianxia Li","doi":"10.62347/JMKV7596","DOIUrl":"10.62347/JMKV7596","url":null,"abstract":"<p><strong>Objective: </strong>To explore the connection between TGF-β1 expression and the survival of patients with head and neck squamous cell carcinoma (HNSCC), as well as whether non-invasive CT-based Radiomics can predict TGF-β1 expression in HNSCC patients.</p><p><strong>Methods: </strong>Data on transcriptional profiling and clinical information were acquired from the TCGA database and subsequently categorized based on the TGF-β1 expression cutoff value. Based on the completeness of enhanced arterial phase CT scans, 139 HNSCC patients were selected. The PyRadiomics package was used to extract radiomic features, and the 3D Slicer software was used for image segmentation. Using the mRMR_RFE and Repeat LASSO algorithms, the optimal features for establishing the corresponding gradient enhancement prediction models were identified.</p><p><strong>Results: </strong>A survival analysis was performed on 483 patients, who were divided into two groups based on the TGF-β1 expression cut-off. The Kaplan-Meier curve indicated that TGF-β1 was a significant independent risk factor that reduced patient survival. To construct gradient enhancement prediction models, we used the mRMR_RFE algorithm and the Repeat_LASSO algorithm to obtain two features (glrlm and ngtdm) and three radiation features (glrlm, first order_10percentile, and gldm). In both the training and validation cohorts, the two established models demonstrated strong predictive potential. Furthermore, there was no statistically significant difference in the calibration curve, DCA diagram, or AUC values between the mRMR_RFE_GBM model and the LASSO_GBM model, suggesting that both models fit well.</p><p><strong>Conclusion: </strong>Based on these findings, TGF-β1 was shown to be significantly associated with a poor prognosis and to be a potential risk factor for HNSCC. Furthermore, by employing the mRMR_RFE_GBM and Repeat_LASSO_GBM models, we were able to effectively predict TGF-β1 expression levels in HNSCC through non-invasive CT-based Radiomics.</p>","PeriodicalId":7572,"journal":{"name":"American journal of nuclear medicine and molecular imaging","volume":"14 4","pages":"239-252"},"PeriodicalIF":2.0,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11411193/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142279064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of bone single-photon emission CT/CT and diffusion-weighted MR imaging in medication-related osteonecrosis of the jaw: focusing on the correlation between standardized uptake values and apparent diffusion coefficient values. 与药物相关的颌骨骨坏死的骨单光子发射 CT/CT 和弥散加权 MR 成像分析:重点关注标准化摄取值与表观弥散系数值之间的相关性。
IF 2 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-08-25 eCollection Date: 2024-01-01 DOI: 10.62347/FFPG9819
Yasuhito Tezuka, Ichiro Ogura

The purpose of this study is to investigate bone SPECT/CT and diffusion-weighted MR imaging (DWI) in medication-related osteonecrosis of the jaw (MRONJ), focusing on the correlation between standardized uptake values (SUVs) and apparent diffusion coefficient (ADC) values. Twenty-nine patients with MRONJ who underwent SPECT/CT and DWI were included in this study. SUVs (maximum and mean) with SPECT/CT, and ADC values (maximum, mean and minimum) with DWI were analyzed on characteristics in MRONJ, such as stage, location, medication and underlying disease, by Mann-Whitney U test. Furthermore, the correlation between SUVs and ADC values for characteristics in MRONJ were assessed by Spearman's rank correlation test for nonparametric data. A p-value lower than 0.05 was considered as statistically significant. SUVs and ADC values have no significant differences for all characteristics in MRONJ. Negative correlations were found in all cases and in stage 2 cases, and no correlations were found in stage 3 cases. In addition, negative correlations were found in maxillary cases, mandibular cases, non-bisphosphonate cases, osteoporosis cases, and malignant tumor cases. In conclusion, this study found multiple correlations between SUVs and ADC values in MRONJ, especially in stage 2. Suggesting that ADC values and SUVs may change with disease progression and the possibility of predicting MRONJ progression by SUVs and ADC values.

本研究的目的是对药物相关性颌骨坏死(MRONJ)的骨SPECT/CT和弥散加权磁共振成像(DWI)进行研究,重点是标准化摄取值(SUV)和表观弥散系数(ADC)值之间的相关性。本研究纳入了 29 例接受 SPECT/CT 和 DWI 检查的 MRONJ 患者。通过 Mann-Whitney U 检验分析了 SPECT/CT 的 SUV 值(最大值和平均值)和 DWI 的 ADC 值(最大值、平均值和最小值)与 MRONJ 的分期、位置、药物治疗和基础疾病等特征的关系。此外,SUV 和 ADC 值与 MRONJ 特征之间的相关性还通过非参数数据的斯皮尔曼秩相关检验进行了评估。P 值小于 0.05 视为具有统计学意义。在 MRONJ 的所有特征中,SUV 和 ADC 值均无明显差异。所有病例和二期病例均呈负相关,三期病例无相关性。此外,在上颌骨病例、下颌骨病例、非双磷酸盐病例、骨质疏松症病例和恶性肿瘤病例中也发现了负相关。总之,本研究发现 SUV 与 ADC 值在 MRONJ 中存在多种相关性,尤其是在 2 期病例中。这表明 ADC 值和 SUV 值可能会随着疾病的进展而变化,并有可能通过 SUV 值和 ADC 值预测 MRONJ 的进展。
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American journal of nuclear medicine and molecular imaging
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