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Development and evaluation of deuterated [F]JHU94620 isotopologues for the non-invasive assessment of the cannabinoid type 2 receptor in brain.
EJNMMI Radiopharm Chem
December 2024
Department of Experimental Neurooncological Radiopharmacy, Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Research Site Leipzig, Permoserstrasse 15, 04318, Leipzig, Germany.
Background: The cannabinoid type 2 receptors (CB2R) represent a target of increasing importance in neuroimaging due to its upregulation under various neuropathological conditions. Previous evaluation of [F]JHU94620 for the non-invasive assessment of the CB2R availability by positron emission tomography (PET) revealed favourable binding properties and brain uptake, however rapid metabolism, and generation of brain-penetrating radiometabolites have been its main limitations. To reduce the bias of CB2R quantification by blood-brain barrier (BBB)-penetrating radiometabolites, we aimed to improve the metabolic stability by developing -d and -d deuterated isotopologues of [F]JHU94620.
View Article and Find Full Text PDFMediterranean diet and brain functional connectivity in a population without dementia.
Front Neuroimaging
December 2024
First Department of Neurology, Aiginition Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
Introduction: Adjustable lifestyle factors, such as diet, are associated with cognitive functions, structural and functional brain measures, but the association between the functional connectivity (FC) and the Mediterranean Diet (Medicine) in population without dementia is yet to be explored.
Methods: The association between MeDi and brain FC in 105 individuals without dementia aged 63 (SD ± 8.72) years old who underwent brain MRI including resting-state (rs) functional MRI (fMRI) was examined.
Understanding transcription profiles of living tissues is critical for biology and medicine. However, measurement of the transcript levels is typically done in homogenized tissues post-mortem. Here, we present a new platform that enables non-invasive monitoring of specific mRNA levels , without tissue destruction.
View Article and Find Full Text PDFThe contributions of relative brain viscosity to brain function and health.
Brain Commun
December 2024
Department of Biomedical Engineering, College of Engineering and Applied Sciences, Columbia University, New York, NY 10027, USA.
Magnetic resonance elastography has emerged over the last two decades as a non-invasive method for quantitatively measuring the mechanical properties of the brain. Since the inception of the technology, brain stiffness has been the primary metric used to describe brain microstructural mechanics. However, more recently, a secondary measure has emerged as both theoretical and experimental significance, which is the ratio of tissue viscosity relative to tissue elasticity.
View Article and Find Full Text PDFDiffusion tensor imaging along the perivascular space: the bias from crossing fibres.
Brain Commun
November 2024
Department of Clinical Sciences, Diagnostic Radiology, Medical Faculty, Lund University, 221 85 Lund, Sweden.
Non-invasive evaluation of glymphatic function has emerged as a crucial goal in neuroimaging, and diffusion tensor imaging along the perivascular space (DTI-ALPS) has emerged as a candidate method for this purpose. Reduced ALPS index has been suggested to indicate impaired glymphatic function. However, the potential impact of crossing fibres on the ALPS index has not been assessed, which was the aim of this cross-sectional study.
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