Publications by authors named "Ikram Ma"

Background: Increased blood pressure (BP) variability is linked to dementia risk, but the relationship between baroreflex sensitivity (BRS), a fundamental mechanism for maintaining stable BP, and dementia risk is undetermined.

Methods: We tested the hypothesis that impaired BRS is associated with increased dementia risk in 1819 older adults (63% women; age, 71.0±6.

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Background: A sustainable pandemic preparedness strategy is essential to ensure equitable access to healthcare for individuals with neurodegenerative diseases. Moreover, it is vital to provide clinicians and researchers in the neurodegenerative disease fields with resources and infrastructure to ensure continuity of their work during a (health) crisis.

Methods: We established an international collaboration between researchers, clinicians, and patient representatives from the Netherlands, Poland, and the United Kingdom.

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  • Cerebral hypoperfusion, or reduced blood flow to the brain, may lead to brain injury and degeneration, but its long-term effects, especially in healthier older adults, are not well understood.
  • This study tracked 3,623 healthy older adults over 11 years using brain scans to measure cerebral blood flow (CBF) and cerebrovascular resistance, aiming to examine changes in subclinical brain disease markers like white matter hyperintensities.
  • Results showed that significant changes in CBF and increased cerebrovascular resistance were linked to a higher risk of progression in white matter hyperintensities, suggesting that monitoring blood flow can help identify potential brain health issues in older adults.
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  • The text reviews various studies to explore the link between thyroid function and body measurements like BMI and weight in the general population.
  • A systematic search of databases yielded 64 studies for qualitative analysis and 21 for quantitative analysis, involving over 107,000 participants, revealing some associations between TSH (Thyroid Stimulating Hormone) and BMI.
  • The findings suggest higher TSH levels are linked to higher BMI and weight, while higher FT4 (free thyroxine) levels are associated with lower BMI and weight, but highlight the need for more robust longitudinal studies due to limited evidence.
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  • White matter hyperintensities (WMH) increase with age and vary significantly between individuals, prompting the need for age- and sex-specific data for better assessment.
  • This study pooled data from nearly 15,000 healthy individuals aged 18-97 to analyze WMH volumes using MRI and established centile curves based on age and sex.
  • Findings reveal that WMH volumes increase significantly with age, with females having larger volumes, and these changes follow different patterns based on specific white matter locations, providing valuable normative data for clinical interpretations.
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Studies investigating the potential health effects of floor of residence have reported conflicting results. In the Rotterdam Study, we examined associations between floor and mortality among elderly residents of a neighborhood of Rotterdam, the Netherlands. Participants who were high-rise residents at baseline (n = 2330) were followed for 10 years, until loss to follow-up or death (N = 602).

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Introduction: Studies have correlated living close to major roads with Alzheimer's disease (AD) risk. However, the mechanisms responsible for this link remain unclear.

Methods: We exposed olfactory mucosa (OM) cells of healthy individuals and AD patients to diesel emissions (DE).

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Objective: This study aimed to investigate serum metabolomic biomarkers associated with incident type 2 diabetes mellitus (T2DM) and evaluate their performance in improving T2DM risk prediction.

Methods: Untargeted proton nuclear magnetic resonance (1H NMR) spectroscopy-based metabolomics analyses were conducted in the Multi-Ethnic Study of Atherosclerosis (MESA; n=3460; discovery cohort) and Rotterdam Study (RS; n=1556; replication cohort). Multivariable cause-specific hazards models were used to analyze the associations between 23,571 serum metabolomic spectral variables and incident T2DM.

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  • - White matter hyperintensities indicate damage in the brain's white matter, which can lead to brain shrinkage and is linked to dementia; a study of over 51,000 people found that larger volumes of these hyperintensities correspond to thinner brain cortex.
  • - Researchers identified 20 significant genetic loci related to white matter hyperintensities that affect genes involved in brain cell types known to support vascular health and neuronal function; some of these genes play roles in processes like axonal structure and transport within the brain.
  • - The genetic traits tied to white matter issues were linked to cardiovascular health, neurodegeneration markers, and poorer cognitive performance, with a polygenic risk score effectively predicting dementia risk in a separate large
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Background: Obesity may affect an individual's immune response and subsequent risk of infection, such as a SARS-CoV-2 infection. It is less clear whether overweight and long-term obesity also constitute risk factors. We investigated the association between the degree and duration of overweight and obesity and SARS-CoV-2 infection.

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  • Hostility in parents is linked to increased aggression and attention issues in children, and this study explored how it affects brain structure in both parents and children using neuroimaging.
  • The study involved a cohort of 484 families, assessing parental hostility at various stages and measuring brain volumes in mothers, fathers, and their children through MRI scans.
  • Findings indicated that prenatal maternal hostility was related to reduced brain volumes in children, suggesting parental hostility can have lasting neurodevelopmental effects that contribute to behavioral problems in their offspring.
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  • MicroRNAs (miRNAs) are small non-coding RNAs that play a crucial role in regulating gene expression and may serve as biomarkers for various diseases through their presence in plasma.
  • The study analyzed 2083 plasma circulating miRNAs from participants in the Rotterdam Study, uncovering 3292 associations between SNPs and miRNAs, with a significant portion confirmed in further studies.
  • Findings suggest that specific miRNAs can influence a range of clinical conditions, with miR-1908-5p showing a protective effect against benign colon neoplasm, highlighting the potential for miRNA-targeted therapies in medicine.
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  • Subcortical brain structures play a crucial role in various developmental and psychiatric disorders, and a study analyzed brain volumes in 74,898 individuals, identifying 254 genetic loci linked to these volumes, which accounted for up to 35% of variation.
  • The research included exploring gene expression in specific neural cell types, focusing on genes involved in intracellular signaling and processes related to brain aging.
  • The findings suggest that certain genetic variants not only influence brain volume but also have potential causal links to conditions like Parkinson’s disease and ADHD, highlighting the genetic basis for risks associated with neuropsychiatric disorders.
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  • This study examined the link between plasma biomarkers indicating endothelial dysfunction and cognitive performance in a sample of 9,414 older adults from the Netherlands, aged 57 to 93 years.
  • Researchers created a composite score from three specific biomarkers and assessed various cognitive functions like executive function and memory.
  • Results indicated a small, consistent association between higher endothelial dysfunction scores and poorer cognitive performance, but no evidence suggested that these markers influenced cognitive decline over time.
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  • - The study assessed how family history of dementia relates to brain structure and cognitive performance in parents (average age 47) and their children (average age 9-13) using data from the Generation R Study.
  • - Out of 1,259 parents, 8.6% reported having a parental history of dementia, while 8.4% of children had a grandparental history, but there were no significant cognitive differences between those with and without such histories, except for slightly worse manual dexterity in the parents.
  • - The findings indicate that while family history of dementia could impact manual skills in mid-life adults, it does not significantly affect cognitive ability or brain structure in either group, suggesting a link primarily to
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  • Subcortical brain structures play a crucial role in various disorders, and a study analyzed the genetic basis of brain volumes in nearly 75,000 individuals of European ancestry, revealing 254 loci linked to these volumes.
  • The research identified significant gene expression in neural cells, relating to brain aging and signaling, and found that polygenic scores could predict brain volumes across different ancestries.
  • The study highlights genetic connections between brain volumes and conditions like Parkinson's disease and ADHD, suggesting specific gene expression patterns could be involved in neuropsychiatric disorders.
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Background: Perceived age (PA) has been associated with mortality, genetic variants linked to ageing and several age-related morbidities. However, estimating PA in large datasets is laborious and costly to generate, limiting its practical applicability.

Objectives: To determine if estimating PA using deep learning-based algorithms results in the same associations with morbidities and genetic variants as human-estimated perceived age.

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Background: Metabolic syndrome is associated with increased risk of dementia. Yet, findings on how longitudinal development of metabolic syndrome status affects cognition remain controversial.

Objectives: This study examines whether individuals with different changes in metabolic syndrome status differ in cognitive functioning.

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Research suggests that respiratory and cardiovascular drugs can ameliorate the rate of lung function decline. To investigate the impact of respiratory and cardiovascular pharmacotherapy on lung function trajectories in the general population. Repeated spirometry was performed in the Rotterdam Study, a population-based cohort of adults aged ≥45 years.

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  • * We found 17 genetic loci associated with sleep duration impacting lipid levels, with 10 of them being newly identified and linked to sleep-related disturbances in lipid metabolism.
  • * The research points to potential drug targets that could lead to new treatments for lipid-related issues in individuals with sleep problems, highlighting the connection between sleep patterns and cardiovascular health.
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Background And Objectives: Markers of white matter (WM) injury on brain MRI are important indicators of brain health. Different patterns of WM atrophy, WM hyperintensities (WMHs), and microstructural integrity could reflect distinct pathologies and disease risks, but large-scale imaging studies investigating WM signatures are lacking. This study aims to identify distinct WM signatures using brain MRI in community-dwelling adults, determine underlying risk factor profiles, and assess risks of dementia, stroke, and mortality associated with each signature.

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  • Neurofilament light chain (NfL) levels serve as a key biomarker for neuro-axonal damage in neurodegenerative disorders, and understanding the genetics behind these levels can reveal important molecular mechanisms.
  • A meta-analysis of genome-wide association studies identified significant genetic loci associated with blood NfL levels in both European and African American populations, highlighting two key regions.
  • The study also indicated that a higher polygenic risk score for NfL correlates with increased levels of other neurodegenerative biomarkers and suggests lower kidney function may lead to elevated NfL levels in the blood.
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Limited population-based data on the gender differences and association between arteriosclerotic calcification at different sites and atrial fibrillation (AF) exist. We aimed to investigate the (gender-specific) associations between arteriosclerotic calcification at different sites with the risk of AF in the general population. Arteriosclerotic calcification was quantified using computed tomography examinations between 2003 and 2006 in 2,259 participants free of AF from the population-based Rotterdam Study.

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