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Because of its excellent ratio of specific to nondisplaceable uptake, the radioligand C-ER176 can successfully image 18-kDa translocator protein (TSPO), a biomarker of inflammation, in the human brain and accurately quantify target density in homozygous low-affinity binders. Our laboratory sought to develop an F-labeled TSPO PET radioligand based on ER176 with the potential for broader distribution. This study used generic C labeling and in vivo performance in the monkey brain to select the most promising among 6 fluorine-containing analogs of ER176 for subsequent labeling with longer-lived F. Six fluorine-containing analogs of ER176-3 fluoro and 3 trifluoromethyl isomers-were synthesized and labeled by C methylation at the secondary amide group of the respective -desmethyl precursor. PET imaging of the monkey brain was performed at baseline and after blockade by -butan-2-yl-1-(2-chlorophenyl)--methylisoquinoline-3-carboxamide (PK11195). Uptake was quantified using radiometabolite-corrected arterial input function. The 6 candidate radioligands were ranked for performance on the basis of 2 in vivo criteria: the ratio of specific to nondisplaceable uptake (i.e., nondisplaceable binding potential []) and the time stability of total distribution volume (), an indirect measure of lack of radiometabolite accumulation in the brain. Total TSPO binding was quantified as corrected for plasma free fraction (/) using Logan graphical analysis for all 6 radioligands. / was generally high at baseline (222 ± 178 mL·cm) and decreased by 70%-90% after preblocking with PK11195. calculated using the Lassen plot was 9.6 ± 3.8; the -fluoro radioligand exhibited the highest (12.1), followed by the -trifluoromethyl (11.7) and -fluoro (8.1) radioligands. For all 6 radioligands, reached 90% of the terminal 120-min values by 70 min and remained relatively stable thereafter, with excellent identifiability (SEs < 5%), suggesting that no significant radiometabolites accumulated in the brain. All 6 radioligands had good and good time stability of Among them, the -fluoro, -trifluoromethyl, and -fluoro compounds were the 3 best candidates for development as radioligands with an F label.
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http://dx.doi.org/10.2967/jnumed.121.263168 | DOI Listing |
Int J Mol Sci
November 2024
Department of Psychiatry and Psychotherapy, University of Regensburg, 93053 Regensburg, Germany.
The translocator protein 18 kDa (TSPO) is a multifunctional outer mitochondrial membrane protein associated with various aspects of mitochondrial physiology and multiple roles in health and disease. Here, we aimed to analyse the role of TSPO in the regulation of mitochondrial and cellular functions in a human neuronal cell model. We used the CRISPR/Cas9 technology and generated TSPO knockout (KO) and control (CTRL) variants of human-induced pluripotent stem cells (hiPSCs).
View Article and Find Full Text PDFHeliyon
December 2024
Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Diagnosis and Treatment of Major Neurological Diseases, National Key Clinical Department and Key Discipline of Neurology, No.58 Zhongshan Road 2, Guangzhou, 510080, China.
Excess dietary sodium can accumulate in brain and adversely affect human health. We have confirmed in previous studies that high salt can induce activation of astrocyte manifested by the secretion of various inflammatory factors. In order to further explore the effect of high salt on the internal cell metabolism of astrocytes, RNA sequencing was performed on astrocytes under high salt environment, which indicated the oxidative phosphorylation and glycolysis pathways of astrocytes were downregulated.
View Article and Find Full Text PDFJ Cereb Blood Flow Metab
December 2024
Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA.
[F]SF51 is a novel radioligand for imaging translocator protein 18 kDa (TSPO) that previously displayed excellent imaging properties in nonhuman primates. This study assessed its performance in human brain and its dosimetry. Seven healthy participants underwent brain PET imaging to measure TSPO binding using a two-tissue compartment model (2TCM) to calculate total distribution volume ().
View Article and Find Full Text PDFSci Transl Med
December 2024
German Center for Neurodegenerative Diseases (DZNE) Munich, 81377 Munich, Germany.
Mol Divers
December 2024
Department of Chemistry, Babasaheb Bhimrao Ambedkar University, Lucknow, Uttar Pradesh, 226025, India.
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