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Appleton J, Funk Q, Bradbury K, Yu M, Faridar A, Beers D, Appel SH, Fujita M, Masdeu JC, Pascual B. Neuroinflammation co‐localizes highly with tau in amnestic mild cognitive impairment. Alzheimers Dement 2022. [DOI: 10.1002/alz.068025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
| | - Quentin Funk
- Houston Methodist Neurological Institute Houston TX USA
| | | | - Meixiang Yu
- Houston Methodist Research Institute Houston TX USA
| | | | - David Beers
- Houston Methodist Research Institute Houston TX USA
| | | | | | | | - Belen Pascual
- Houston Methodist Neurological Institute Houston TX USA
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Ye F, Funk Q, Rockers E, Shulman JM, Masdeu JC, Pascual B. In Alzheimer-prone brain regions, metabolism and risk-gene expression are strongly correlated. Brain Commun 2022; 4:fcac216. [PMID: 36092303 PMCID: PMC9453434 DOI: 10.1093/braincomms/fcac216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 04/20/2022] [Accepted: 08/24/2022] [Indexed: 12/02/2022] Open
Abstract
Neuroimaging in the preclinical phase of Alzheimer’s disease provides information crucial to early intervention, particularly in people with a high genetic risk. Metabolic network modularity, recently applied to the study of dementia, is increased in Alzheimer’s disease patients compared with controls, but network modularity in cognitively unimpaired elderly with various risks of developing Alzheimer’s disease needs to be determined. Based on their 5-year cognitive progression, we stratified 117 cognitively normal participants (78.3 ± 4.0 years of age, 52 women) into three age-matched groups, each with a different level of risk for Alzheimer’s disease. From their fluorodeoxyglucose PET we constructed metabolic networks, evaluated their modular structures using the Louvain algorithm, and compared them between risk groups. As the risk for Alzheimer’s disease increased, the metabolic connections among brain regions weakened and became more modular, indicating network fragmentation and functional impairment of the brain. We then set out to determine the correlation between regional brain metabolism, particularly in the modules derived from the previous analysis, and the regional expression of Alzheimer-risk genes in the brain, obtained from the Allen Human Brain Atlas. In all risk groups of this elderly population, the regional brain expression of most Alzheimer-risk genes showed a strong correlation with brain metabolism, particularly in the module that corresponded to regions of the brain that are affected earliest and most severely in Alzheimer’s disease. Among the genes, APOE and CD33 showed the strongest negative correlation and SORL1 showed the strongest positive correlation with brain metabolism. The Pearson correlation coefficients remained significant when contrasted against a null-hypothesis distribution of correlation coefficients across the whole transcriptome of 20 736 genes (SORL1: P = 0.0130; CD33, P = 0.0136; APOE: P = 0.0093). The strong regional correlation between Alzheimer-related gene expression in the brain and brain metabolism in older adults highlights the role of brain metabolism in the genesis of dementia.
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Affiliation(s)
- Fengdan Ye
- Department of Physics and Astronomy, Rice University , Houston, TX 77005 , USA
- Center for Theoretical Biological Physics, Rice University , Houston, TX 77005 , USA
- Nantz National Alzheimer Center, Houston Methodist Neurological and Research Institute, Houston Methodist Hospital, Weill Cornell Medicine , Houston, TX 77030 , USA
| | - Quentin Funk
- Nantz National Alzheimer Center, Houston Methodist Neurological and Research Institute, Houston Methodist Hospital, Weill Cornell Medicine , Houston, TX 77030 , USA
| | - Elijah Rockers
- Nantz National Alzheimer Center, Houston Methodist Neurological and Research Institute, Houston Methodist Hospital, Weill Cornell Medicine , Houston, TX 77030 , USA
| | - Joshua M Shulman
- Department of Neurology, Baylor College of Medicine , Houston, TX 77030 , USA
- Department of Neuroscience, Baylor College of Medicine , Houston, TX 77030 , USA
- Department of Molecular and Human Genetics, Baylor College of Medicine , Houston, TX 77030 , USA
- Center for Alzheimer’s and Neurodegenerative Diseases, Baylor College of Medicine , Houston, TX 77030 , USA
- Jan and Dan Duncan Neurological Research Institute, Texas Children’s Hospital , Houston, TX 77030 , USA
| | - Joseph C Masdeu
- Nantz National Alzheimer Center, Houston Methodist Neurological and Research Institute, Houston Methodist Hospital, Weill Cornell Medicine , Houston, TX 77030 , USA
| | - Belen Pascual
- Nantz National Alzheimer Center, Houston Methodist Neurological and Research Institute, Houston Methodist Hospital, Weill Cornell Medicine , Houston, TX 77030 , USA
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Pascual B, Hodics T, Funk Q, Cykowski MD, Nakawah MO, Masdeu JC. Translocator Protein 18 kDa PET Imaging Highlights Asymptomatic Isolated Cerebellar Dysplasia. Neurology 2022; 98:538-539. [PMID: 35131911 PMCID: PMC8967423 DOI: 10.1212/wnl.0000000000200221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Belen Pascual
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX
| | - Timea Hodics
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX
| | - Quentin Funk
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX
| | - Matthew D Cykowski
- Department ofPathology and Genomic Medicine, Houston Methodist Research Institute and Weill Cornell Medicine, Houston, TX
| | - Mohammad O Nakawah
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX
| | - Joseph C Masdeu
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX
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Pascual B, Funk Q, Bradbury K, Jennings C, Rockers E, Nakawah MO, Yu M, Beers D, Faridar A, Appel S, Fujita M, Masdeu JC. Neuroinflammation and flortaucipir PET in non‐fluent/agrammatic variant of primary progressive aphasia and/or apraxia of speech. Alzheimers Dement 2021. [DOI: 10.1002/alz.056501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Belen Pascual
- Houston Methodist Neurological Institute Houston TX USA
| | - Quentin Funk
- Houston Methodist Neurological Institute Houston TX USA
| | | | | | | | | | - Meixiang Yu
- Houston Methodist Research Institute Houston TX USA
| | - David Beers
- Houston Methodist Neurological Institute Houston TX USA
| | | | - Stanley Appel
- Houston Methodist Neurological Institute Houston TX USA
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Pascual B, Funk Q, Zanotti-Fregonara P, Cykowski MD, Veronese M, Rockers E, Bradbury K, Yu M, Nakawah MO, Román GC, Schulz PE, Arumanayagam AS, Beers D, Faridar A, Fujita M, Appel SH, Masdeu JC. Neuroinflammation is highest in areas of disease progression in semantic dementia. Brain 2021; 144:1565-1575. [PMID: 33824991 DOI: 10.1093/brain/awab057] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 11/25/2020] [Accepted: 12/10/2020] [Indexed: 12/11/2022] Open
Abstract
Despite epidemiological and genetic data linking semantic dementia to inflammation, the topography of neuroinflammation in semantic dementia, also known as the semantic variant of primary progressive aphasia, remains unclear. The pathology starts at the tip of the left temporal lobe where, in addition to cortical atrophy, a strong signal appears with the tau PET tracer 18F-flortaucipir, even though the disease is not typically associated with tau but with TDP-43 protein aggregates. Here, we characterized the topography of inflammation in semantic variant primary progressive aphasia using high-resolution PET and the tracer 11C-PBR28 as a marker of microglial activation. We also tested the hypothesis that inflammation, by providing non-specific binding targets, could explain the 18F-flortaucipir signal in semantic variant primary progressive aphasia. Eight amyloid-PET-negative patients with semantic variant primary progressive aphasia underwent 11C-PBR28 and 18F-flortaucipir PET. Healthy controls underwent 11C-PBR28 PET (n = 12) or 18F-flortaucipir PET (n = 12). Inflammation in PET with 11C-PBR28 was analysed using Logan graphical analysis with a metabolite-corrected arterial input function. 18F-flortaucipir standardized uptake value ratios were calculated using the cerebellum as the reference region. Since monoamine oxidase B receptors are expressed by astrocytes in affected tissue, selegiline was administered to one patient with semantic variant primary progressive aphasia before repeating 18F-flortaucipir scanning to test whether monoamine oxidase B inhibition blocked flortaucipir binding, which it did not. While 11C-PBR28 uptake was mostly cortical, 18F-flortaucipir uptake was greatest in the white matter. The uptake of both tracers was increased in the left temporal lobe and in the right temporal pole, as well as in regions adjoining the left temporal pole such as insula and orbitofrontal cortex. However, peak uptake of 18F-flortaucipir localized to the left temporal pole, the epicentre of pathology, while the peak of inflammation 11C-PBR28 uptake localized to a more posterior, mid-temporal region and left insula and orbitofrontal cortex, in the periphery of the damage core. Neuroinflammation, greatest in the areas of progression of the pathological process in semantic variant primary progressive aphasia, should be further studied as a possible therapeutic target to slow disease progression.
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Affiliation(s)
- Belen Pascual
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Quentin Funk
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Paolo Zanotti-Fregonara
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Matthew D Cykowski
- Department of Pathology and Genomic Medicine, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA.,Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Mattia Veronese
- Centre for Neuroimaging Sciences, King's College London, London, UK
| | - Elijah Rockers
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Kathleen Bradbury
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Meixiang Yu
- Cyclotron and Radiopharmaceutical Core, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Mohammad O Nakawah
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Gustavo C Román
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Paul E Schulz
- Department of Neurology, McGovern Medical School of UT Health, Houston, TX, USA
| | - Anithachristy S Arumanayagam
- Department of Pathology and Genomic Medicine, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - David Beers
- Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Alireza Faridar
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Masahiro Fujita
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Stanley H Appel
- Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
| | - Joseph C Masdeu
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, TX, USA
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Pascual B, Masdeu JC, Funk Q, Zanotti-Fregonara P, Shyer M, Rockers E, Schulz PE. Posterior primary progressive prosopagnosia: Structural and molecular imaging. Neurology 2020; 94:360-361. [PMID: 31964687 DOI: 10.1212/wnl.0000000000009001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Belen Pascual
- From the Department of Stanley H. Appel Neurology (B.P., J.C.M., Q.F., P.Z.-F., M.S., E.R.) and the Nantz National Alzheimer Center, Houston Methodist Neurological Institute, TX; Weill Cornell Medical College (B.P., J.C.M., P.Z.-F.), New York, NY; and Department of Neurology (P.E.S.), McGovern Medical School of UTHealth, Houston, TX.
| | - Joseph C Masdeu
- From the Department of Stanley H. Appel Neurology (B.P., J.C.M., Q.F., P.Z.-F., M.S., E.R.) and the Nantz National Alzheimer Center, Houston Methodist Neurological Institute, TX; Weill Cornell Medical College (B.P., J.C.M., P.Z.-F.), New York, NY; and Department of Neurology (P.E.S.), McGovern Medical School of UTHealth, Houston, TX
| | - Quentin Funk
- From the Department of Stanley H. Appel Neurology (B.P., J.C.M., Q.F., P.Z.-F., M.S., E.R.) and the Nantz National Alzheimer Center, Houston Methodist Neurological Institute, TX; Weill Cornell Medical College (B.P., J.C.M., P.Z.-F.), New York, NY; and Department of Neurology (P.E.S.), McGovern Medical School of UTHealth, Houston, TX
| | - Paolo Zanotti-Fregonara
- From the Department of Stanley H. Appel Neurology (B.P., J.C.M., Q.F., P.Z.-F., M.S., E.R.) and the Nantz National Alzheimer Center, Houston Methodist Neurological Institute, TX; Weill Cornell Medical College (B.P., J.C.M., P.Z.-F.), New York, NY; and Department of Neurology (P.E.S.), McGovern Medical School of UTHealth, Houston, TX
| | - Madison Shyer
- From the Department of Stanley H. Appel Neurology (B.P., J.C.M., Q.F., P.Z.-F., M.S., E.R.) and the Nantz National Alzheimer Center, Houston Methodist Neurological Institute, TX; Weill Cornell Medical College (B.P., J.C.M., P.Z.-F.), New York, NY; and Department of Neurology (P.E.S.), McGovern Medical School of UTHealth, Houston, TX
| | - Elijah Rockers
- From the Department of Stanley H. Appel Neurology (B.P., J.C.M., Q.F., P.Z.-F., M.S., E.R.) and the Nantz National Alzheimer Center, Houston Methodist Neurological Institute, TX; Weill Cornell Medical College (B.P., J.C.M., P.Z.-F.), New York, NY; and Department of Neurology (P.E.S.), McGovern Medical School of UTHealth, Houston, TX
| | - Paul E Schulz
- From the Department of Stanley H. Appel Neurology (B.P., J.C.M., Q.F., P.Z.-F., M.S., E.R.) and the Nantz National Alzheimer Center, Houston Methodist Neurological Institute, TX; Weill Cornell Medical College (B.P., J.C.M., P.Z.-F.), New York, NY; and Department of Neurology (P.E.S.), McGovern Medical School of UTHealth, Houston, TX
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Pascual B, Funk Q, Zanotti-Fregonara P, Pal N, Rockers E, Yu M, Spann B, Román GC, Schulz PE, Karmonik C, Appel SH, Masdeu JC. Multimodal 18F-AV-1451 and MRI Findings in Nonfluent Variant of Primary Progressive Aphasia: Possible Insights on Nodal Propagation of Tau Protein Across the Syntactic Network. J Nucl Med 2019; 61:263-269. [PMID: 31350322 DOI: 10.2967/jnumed.118.225508] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 07/06/2019] [Indexed: 11/16/2022] Open
Abstract
Although abnormally folded tau protein has been found to self-propagate from neuron to connected neuron, similar propagation through human brain networks has not been fully documented. We studied tau propagation in the left hemispheric syntactic network, which comprises an anterior frontal node and a posterior temporal node connected by the white matter of the left arcuate fasciculus. This network is affected in the nonfluent variant of primary progressive aphasia, a neurodegenerative disorder with tau accumulation. Methods: Eight patients with the nonfluent variant of primary progressive aphasia (age, 67.0 ± 7.4 y; 4 women) and 8 healthy controls (age, 69.6 ± 7.0 y; 4 women) were scanned with 18F-AV-1451 tau PET to determine tau deposition in the brain and with MRI to determine the fractional anisotropy of the arcuate fasciculus. Normal syntactic network characteristics were confirmed with structural MRI diffusion imaging in our healthy controls and with blood oxygenation level-dependent functional imaging in 35 healthy participants from the Alzheimer Disease Neuroimaging Initiative database. Results: Language scores in patients indicated dysfunction of the anterior node. 18F-AV-1451 deposition was greatest in the 2 nodes of the syntactic network. The left arcuate fasciculus had decreased fractional anisotropy, particularly near the anterior node. Normal MRI structural connectivity from an area similar to the one containing tau in the anterior frontal node projected to an area similar to the one containing tau in the patients in the posterior temporal node. Conclusion: Tau accumulation likely started in the more affected anterior node and, at the disease stage at which we studied these patients, appeared as well in the brain region (in the temporal lobe) spatially separate from but most connected with it. The arcuate fasciculus, connecting both of them, was most severely affected anteriorly, as would correspond to a loss of axons from the anterior node. These findings are suggestive of tau propagation from node to connected node in a natural human brain network and support the idea that neurons that wire together die together.
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Affiliation(s)
- Belen Pascual
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Quentin Funk
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Paolo Zanotti-Fregonara
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Neha Pal
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Elijah Rockers
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Meixiang Yu
- Cyclotron and Radiopharmaceutical Core, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Bryan Spann
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Gustavo C Román
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | | | - Christof Karmonik
- MRI Core, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas; and
| | - Stanley H Appel
- Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
| | - Joseph C Masdeu
- Nantz National Alzheimer Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston Methodist Research Institute, Weill Cornell Medicine, Houston, Texas
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Abstract
We have developed a technique for discharging fused silica test masses in a gravitational-wave interferometer with nitrogen ionized by an electron beam. The electrons are produced from a heated filament by thermionic emission in a low-pressure region to avoid contamination and burnout. Some electrons then pass through a small aperture and ionize nitrogen in a higher-pressure region, and this ionized gas is pumped across the test mass surface, neutralizing both polarities of charge. The discharge rate varies exponentially with charge density and filament current, quadratically with filament potential, and has an optimal working pressure of ∼8 mT. Adapting the technique to larger test mass chambers is also discussed.
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Affiliation(s)
- D Ugolini
- Department of Physics and Astronomy, Trinity University, San Antonio, Texas 78212, USA.
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