Clinical Manifestations

Neurodegenerative pathologies, including tau depositions, have been implicated in late-onset depression (LOD), while there is a lack of in-vivo evidence for the neuropathological basis of late-onset bipolar disorder (LOBD) despite postmortem findings of cerebral tau accumulations. The current study...

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Published in:Alzheimer's & dementia 2023-12, Vol.19 Suppl 18, p.e078062
Main Authors: Kurose, Shin, Takahata, Keisuke, Sano, Yasunori, Tagai, Kenji, Ichihashi, Masanori, Endo, Hironobu, Hirata, Kosei, Matsuoka, Kiwamu, Kataoka, Yuko, Kubota, Manabu, Moriguchi, Sho, Yamamoto, Yasuharu, Oyama, Asaka, Oya, Masaki, Matsumoto, Hideki, Kokubo, Naomi, Suzuki, Hisaomi, Mashima, Yuki, Seki, Chie, Kawamura, Kazunori, Zhang, Ming-Rong, Tabuchi, Hajime, Tokuda, Takahiko, Onaya, Mitsumoto, Mimura, Masaru, Higuchi, Makoto
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Language:English
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Summary:Neurodegenerative pathologies, including tau depositions, have been implicated in late-onset depression (LOD), while there is a lack of in-vivo evidence for the neuropathological basis of late-onset bipolar disorder (LOBD) despite postmortem findings of cerebral tau accumulations. The current study aimed to assess tau pathologies in LOBD and LOD patients positron emission tomography (PET) with 18F-florzolotau, a radioligand for Alzheimer's disease (AD) and non-AD tau fibrils.BACKGROUNDNeurodegenerative pathologies, including tau depositions, have been implicated in late-onset depression (LOD), while there is a lack of in-vivo evidence for the neuropathological basis of late-onset bipolar disorder (LOBD) despite postmortem findings of cerebral tau accumulations. The current study aimed to assess tau pathologies in LOBD and LOD patients positron emission tomography (PET) with 18F-florzolotau, a radioligand for Alzheimer's disease (AD) and non-AD tau fibrils.We studied LOBD and LOD patients who developed the first episode of mania or depression after age 45. Twenty-one patients with LOBD (68.8 ± 9.6 years old; 11 females), 15 patients with LOD (73.0 ± 5.8 years old; 11 females), and 39 age-matched healthy controls (HCs) (67.1 ± 9.1 years old; 19 females) underwent tau and amyloid PET scans with 18F-florzolotau and 11C-PiB, respectively. Amyloid positivity was determined by a visual read of 11C-PiB-PET images, and tau depositions were assessed by calculating standardized uptake value ratios (SUVRs) in 52 regions covering the cerebral grey matter and basal ganglia to the optimized reference tissue. All SUVRs were corrected for age and sex and converted to Z-score relative to HCs. The positivity and topology of tau pathologies were determined according to the presence of a region with a Z-score ≥ 2.0.METHODSWe studied LOBD and LOD patients who developed the first episode of mania or depression after age 45. Twenty-one patients with LOBD (68.8 ± 9.6 years old; 11 females), 15 patients with LOD (73.0 ± 5.8 years old; 11 females), and 39 age-matched healthy controls (HCs) (67.1 ± 9.1 years old; 19 females) underwent tau and amyloid PET scans with 18F-florzolotau and 11C-PiB, respectively. Amyloid positivity was determined by a visual read of 11C-PiB-PET images, and tau depositions were assessed by calculating standardized uptake value ratios (SUVRs) in 52 regions covering the cerebral grey matter and basal ganglia to the optimized reference tissue. All SUVRs were c
ISSN:1552-5279
1552-5279
DOI:10.1002/alz.078062