The regional pattern of age-related synaptic loss in the human brain differs from gray matter volume loss: in vivo PET measurement with [11C]UCB-J.

Autor: Toyonaga, Takuya, Khattar, Nikkita, Wu, Yanjun, Lu, Yihuan, Naganawa, Mika, Gallezot, Jean-Dominique, Matuskey, David, Mecca, Adam P., Pittman, Brian, Dias, Mark, Nabulsi, Nabeel B., Finnema, Sjoerd J., Chen, Ming-Kai, Arnsten, Amy, Radhakrishnan, Rajiv, Skosnik, Patrick D., D'Souza, Deepak Cyril, Esterlis, Irina, Huang, Yiyun, van Dyck, Christopher H.
Předmět:
Zdroj: European Journal of Nuclear Medicine & Molecular Imaging; Mar2024, Vol. 51 Issue 4, p1012-1022, 11p
Abstrakt: Purpose: Aging is a major societal concern due to age-related functional losses. Synapses are crucial components of neural circuits, and synaptic density could be a sensitive biomarker to evaluate brain function. [11C]UCB-J is a positron emission tomography (PET) ligand targeting synaptic vesicle glycoprotein 2A (SV2A), which can be used to evaluate brain synaptic density in vivo. Methods: We evaluated age-related changes in gray matter synaptic density, volume, and blood flow using [11C]UCB-J PET and magnetic resonance imaging (MRI) in a wide age range of 80 cognitive normal subjects (21–83 years old). Partial volume correction was applied to the PET data. Results: Significant age-related decreases were found in 13, two, and nine brain regions for volume, synaptic density, and blood flow, respectively. The prefrontal cortex showed the largest volume decline (4.9% reduction per decade: RPD), while the synaptic density loss was largest in the caudate (3.6% RPD) and medial occipital cortex (3.4% RPD). The reductions in caudate are consistent with previous SV2A PET studies and likely reflect that caudate is the site of nerve terminals for multiple major tracts that undergo substantial age-related neurodegeneration. There was a non-significant negative relationship between volume and synaptic density reductions in 16 gray matter regions. Conclusion: MRI and [11]C-UCB-J PET showed age-related decreases of gray matter volume, synaptic density, and blood flow; however, the regional patterns of the reductions in volume and SV2A binding were different. Those patterns suggest that MR-based measures of GM volume may not be directly representative of synaptic density. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje