Publications by authors named "Junyoung Lee"

Importance: The neuropathological links underlying the association between changes in liver function and AD have not yet been clearly elucidated.

Objective: We aimed to examine the relationship between liver function markers and longitudinal changes in Alzheimer's disease (AD) core pathologies.

Design: Data from the Korean Brain Aging Study for the Early Diagnosis and Prediction of Alzheimer's Disease, a longitudinal cohort study initiated in 2014, were utilized.

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Background: Whether telomere length (TL), an indicator of biological ageing, reflects Alzheimer's disease (AD)-related neuropathological change remains unclear. We investigated the relationships between TL, in vivo AD pathologies, including cerebral beta-amyloid and tau deposition, and cognitive outcomes in older adults.

Methods: A total of 458 older adults were included, encompassing both cognitively normal (CN) individuals and those cognitively impaired (CI), with the CI group consisting of individuals with mild cognitive impairment or AD dementia.

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Article Synopsis
  • The study explored the correlation between tau accumulation in the locus coeruleus (LC) and its relationship with tau levels in various cortical regions based on Braak stages, particularly focusing on the influence of amyloid beta (Aβ) deposition.
  • A total of 170 participants underwent advanced imaging techniques, including tau and amyloid PET scans, revealing a significant relationship between LC tau burden and global tau accumulation, especially in individuals with Aβ positivity.
  • While LC tau did not directly affect memory, it was linked to delayed memory through various pathways, highlighting LC tau as a potential indicator for cognitive decline in Alzheimer's disease.
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Introduction: The influence of genetic variation on tau protein aggregation, a key factor in Alzheimer's disease (AD), remains not fully understood. We aimed to identify novel genes associated with brain tau deposition using pathway-based candidate gene association analysis in a Korean cohort.

Methods: We analyzed data for 146 older adults from the well-established Korean AD continuum cohort (Korean Brain Aging Study for the Early Diagnosis and Prediction of Alzheimer's Disease; KBASE).

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  • The study addresses the lack of ethnic diversity in Alzheimer's research, focusing on Asian populations, particularly Koreans, to enhance understanding of the disease.
  • RNA sequencing was conducted on blood samples to analyze gene expression and its relation to amyloid beta (Aβ) deposition, leading to the identification of 265 dysregulated genes associated with Aβ.
  • Findings suggest that certain genes linked to Aβ deposition are enriched in natural killer cell-mediated immunity, highlighting potential new avenues for diagnostics and therapies in Alzheimer's disease.
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  • Limited research has examined how cardiovascular risk and amyloid levels influence cognitive decline in East Asians, specifically in a study involving 526 participants from the Korean Brain Aging Study.
  • Results showed that cognitively normal individuals without amyloid (Aβ-) but with high cardiovascular risk scores had significantly lower cognitive performance than their low-risk counterparts.
  • Ultimately, while managing vascular risk is important for early cognitive preservation in Aβ- individuals, amyloid pathology was found to be the main factor driving cognitive decline in both cognitively normal and mild cognitive impairment groups, regardless of vascular risk status.
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  • The study compared the performance of two MR volumetry segmentation tools, FreeSurfer and Neurophet AQUA, at different magnetic field strengths (1.5T and 3T) using data from 213 patients across multiple sources.
  • It found that FreeSurfer reported larger hippocampus volumes while Neurophet AQUA exhibited lower average volume differences and more stable segmentation across brain regions.
  • Additionally, Neurophet AQUA proved significantly faster, taking only 5 minutes for segmentation compared to 1 hour for FreeSurfer, suggesting a trade-off between accuracy, consistency, and processing time in choosing a segmentation method.
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Objective: Previous studies have reported that vitamin D deficiency increased the risk of Alzheimer's disease (AD) dementia in older adults. However, little is known about how vitamin D is involved in the pathophysiology of AD. Thus, this study aimed to examine the association and interaction of serum vitamin D levels with AD pathologies including cerebral beta-amyloid (Aβ) deposition and neurodegeneration in nondemented older adults.

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Objective: We intended to investigate the relationships between visual sensory impairment (VSI) or auditory sensory impairment (ASI) and brain pathological changes associated with cognitive decline in older adults.

Methods: We primarily tried to examine whether each sensory impairment is related to Alzheimer's disease (AD) pathology, specifically beta-amyloid (Aβ) deposition, through both cross-sectional and longitudinal approaches in cognitively unimpaired older adults. Self-report questionnaires on vision and hearing status were administered at the baseline.

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Objective: This study investigated to what extent a range of depressive symptoms was differentially present depending on age group in Korean population.

Methods: Data was pooled from five nationally representative surveys in which 29,418 respondents aged at least 18 years were interviewed face-to-face using the Korean version of the Composite International Diagnostic Interview. A total of 691 (2.

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Objective: Tinnitus may be associated with various brain changes. However, the degenerative changes in patients with tinnitus have not been extensively investigated. We aimed to evaluate degenerative, structural, and functional brain changes in patients with mild cognitive impairment (MCI) who also suffer from tinnitus.

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Background: Plasma neurofilament light chain (NfL) is a blood biomarker of neurodegeneration, including Alzheimer's disease. However, its usefulness may be influenced by common conditions in older adults, including amyloid-β (Aβ) deposition and cardiometabolic risk factors like hypertension, diabetes mellitus (DM), impaired kidney function, and obesity. This longitudinal observational study using the Alzheimer's Disease Neuroimaging Initiative cohort investigated how these conditions influence the prognostic capacity of plasma NfL.

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This study advances the automation of Parkinson's disease (PD) diagnosis by analyzing speech characteristics, leveraging a comprehensive approach that integrates a voting-based machine learning model. Given the growing prevalence of PD, especially among the elderly population, continuous and efficient diagnosis is of paramount importance. Conventional monitoring methods suffer from limitations related to time, cost, and accessibility, underscoring the need for the development of automated diagnostic tools.

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Background: Altered thyroid hormone levels have been associated with increased risk of Alzheimer's disease (AD) dementia and related cognitive decline. However, the neuropathological substrates underlying the link between thyroid hormones and AD dementia are not yet fully understood. We first investigated the association between serum thyroid hormone levels and in vivo AD pathologies including both beta-amyloid (Aβ) and tau deposition measured by positron emission tomography (PET).

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Background: Computerized cognitive training (CCT) has been proposed as a potential therapy for cognitive decline. One of the benefits of CCT is a transfer effect, but its mechanism on the memory domain is unclear. This study aimed to investigate the transfer effect of non-memory multidomain CCT on the memory domain and its neural basis in patients with mild cognitive impairment (MCI) through a randomized controlled trial.

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Morning glory disc anomaly is a rare congenital anomaly affecting the optic disc and is frequently associated with retinal detachment. This report presents a unique case of a 10-year-old boy with morning glory disc anomaly and serous retinal detachment, treated with oral acetazolamide. Remarkably, half of the retina exhibiting bullous detachment was reattached leading to full recovery of vision within a few days after starting acetazol-amide treatment.

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Article Synopsis
  • The study aims to enhance the diagnosis of Alzheimer's disease (AD) by implementing automated scoring methods for brain atrophy using deep learning techniques, addressing limitations of traditional visual scoring.* -
  • Involving nearly 4,000 participants, the research compared results from automated scoring methods and visual assessments performed by neuroradiologists to evaluate their consistency and reliability.* -
  • Findings indicate strong correlations between automated and visual scores for AD subtyping, suggesting automated methods could improve clinical assessments in large-scale studies.*
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Background: This study aims to report the midterm outcomes after surgical treatment of Hawkins Classification III Talar neck fractures.

Methods: From March 2010 to April 2022, among a total of 155 patients who visited our hospital with talus fractures, 31 patients underwent surgical treatment for Hawkins classification III talar neck fractures. The inclusion criteria comprised patients with a symptom duration of over 1 year who were available for outpatient follow-up and underwent magnetic resonance imaging (MRI) follow-up 2 months after surgery.

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  • Low plasma leptin levels are linked to a higher risk of Alzheimer disease and cognitive decline, but the exact mechanisms remain unclear.
  • A longitudinal study analyzed data from 208 cognitively unimpaired older adults to explore the relationship between plasma leptin and brain pathologies related to Alzheimer's, focusing on amyloid-beta and tau deposition.
  • Results showed that lower leptin levels were significantly associated with greater brain amyloid-beta deposition, while no significant link was found between leptin levels and tau deposition in the study cohort.
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Background And Objectives: Accumulating evidence shows that sodium-glucose cotransporter 2 inhibitors (SGLT2is) reduce adverse cardiovascular outcomes. However, whether SGLT2i, compared with other antidiabetic drugs, reduce the new development of atrial fibrillation (AF) is unclear. In this study, we compared SGLT2i with dipeptidyl peptidase-4 inhibitors (DPP-4is) in terms of reduction in the risk of AF in individuals with type 2 diabetes.

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This study aimed to explore the predictors of posttraumatic stress disorder (PTSD) in women who have recently experienced sexual assault, by examining psychological and neurophysiological factors using a prospective design with resting-state electroencephalogram (EEG) functional connectivity. The study enrolled 33 women who had been recently traumatized by sexual assault and conducted assessments within a month of the trauma. These survivors were evaluated for PTSD three months later and were classified into two groups: PTSD positive (n = 12) and PTSD negative (n = 21).

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Background: Recombinant human interleukin (rhIL)-7-hyFc (efineptakin alfa; NT-I7) is a potent T-cell amplifier, with two IL-7 molecules fused to IgD/IgG4 elements. rhIL-7-hyFc promotes extensive infiltration of CD8 T cells into the tumor, concurrently increasing the numbers of intratumoral PD-1CD8 T cells. The hIL-2/TCB2 complex (SLC-3010) inhibits tumor growth by preferential activation of CD122 (IL-2Rβ) CD8 T cells and natural killer cells, over regulatory T cells (Tregs).

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Background: Neuropsychiatric symptoms and delusions are highly prevalent among people with dementia. However, multiple roots of neurobiological bases and shared neural basis of delusion and cognitive function remain to be characterized. By utilizing a fine-grained multivariable approach, we investigated distinct neuroanatomical correlates of delusion symptoms across a large population of dementing illnesses.

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In recent times, the utilization of three-dimensional (3D) printing technology, particularly a variant using digital light processing (DLP), has gained increasing fascination in the realm of microfluidic research because it has proven advantageous and expedient for constructing microscale 3D structures. The surface wetting characteristics (e.g.

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Article Synopsis
  • The study investigates white matter microstructural changes in the hippocampal cingulum bundle among Korean older adults with varying cognitive conditions, including Alzheimer's disease (AD), mild cognitive impairment (MCI), and those who are cognitively normal (CN).
  • Results revealed that both AD and MCI participants exhibited greater measures of radial diffusivity (RD), mean diffusivity (MD), and axial diffusivity (AxD), along with reduced fractional anisotropy (FA) compared to CN individuals.
  • The findings indicate a correlation between poorer white matter integrity in the cingulum bundle and worse cognitive performance and higher amyloid burden, aligning with previous research focused on predominantly European populations.
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