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Tc-99m labeled PSMA-617 as a potential SPECT radiotracer for prostate cancer diagnostics: Complexation optimization and its in vitro/vivo evaluation.
Bioorg Med Chem
January 2025
Division of Nuclear Medicine, Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address:
Technetium-99m (Tc-99m) is the most employed radionuclide in nuclear imaging diagnostics worldwide for many diseases. The ideal physiochemical properties of Tc-99m (such as half-life and pure gamma energy) make it favorable for Single Photon Emission Computed Tomography (SPECT). In this study, we aim to expand the utilization of Tc-99m radiopharmaceutical toward prostate cancer diagnostics which is currently no FDA approved products and has been intensively examined for a potential candidate.
View Article and Find Full Text PDFA whole gamma imaging prototype for higher quantitative imaging ofZr-labeled antibodies in a tumor mouse model.
Phys Med Biol
January 2025
National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, JAPAN.
PET has become an important clinical modality but is limited to imaging positron emitters. Recently, PET imaging withZr, which has a half-life of 3 days, has attracted much attention in immuno-PET to visualize immune cells and cancer cells by targeting specific antibodies on the cell surface. However,Zr emits a single gamma ray at 909 keV four times more frequently than positrons, causing image quality degradation in conventional PET.
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
University of Pittsburgh, Pittsburgh, PA, USA.
Background: Neurofibrillary tangles (NFT), consisting of hyperphosphorylated tau aggregates, are one of the major pathological hallmarks of Alzheimer's disease (AD). The burden of NFTs correlates with cognitive decline, and in vivo detection of NFT may help predict the clinical progression of AD. Mass spectrometry-based proteomic analysis of brain regions affected by NFTs holds the potential to unveil the molecular mechanisms underlying tau pathogenesis and uncover novel diagnostic/prognostic biomarkers and therapeutic targets.
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
Dementia Research Centre, UCL Queen Square Institute of Neurology, London, United Kingdom.
Background: Knowledge of the chemical composition of amyloid plaques and tau tangles at the earlier stages of Alzheimer's disease (AD) pathology is sparse. This is due to limited access to human brain during life and at the earlier stages of AD pathophysiology and technical limitations in quantifying amyloid and tau species at a subcellular level. Understanding the chemical composition of plaques and tangles, how rapidly they grow and what factors drive growth is important for developing and refining therapeutics.
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
Department of Neurology, Mayo Clinic, Rochester, MN, USA.
Background: While disease-modifying treatments that reduce Aβ have been recently approved by the FDA, the identification of novel therapeutic targets and strategies that target underlying mechanisms to delay the AD development are still needed. Abnormal brain energy homeostasis and mitochondria dysfunction are observed early in AD. Therefore, the development of treatments to restore these defects could be beneficial.
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