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Long COVID Brain Fog Linked to Dopamine Nerve Damage, Study Finds

Long COVID Brain Fog Linked to Dopamine Nerve Damage, Study Finds

A new study by researchers at the Centre for Addiction and Mental Health and the University of Toronto has identified a biological explanation for the 'brain fog' experienced by many Long COVID patients: damage to dopamine-releasing nerve terminals. Using PET imaging, the study measured levels of VMAT2, a protein found on these nerve terminals, in 24 Long COVID patients and 24 healthy individuals. The findings revealed significantly lower VMAT2 levels in Long COVID patients across brain regions associated with motivation, movement, and memory (the striatum). Reductions ranged from 16% in the planning region (dorsal putamen) to 20% in the motivation and apathy region (ventral striatum). This research builds on a previous 2023 study by the same team that found elevated inflammation in these brain regions, suggesting a potential link where inflammation may damage dopamine nerves.

Stratified Medicine Advances Alzheimer's Disease Research by Identifying Genetic Modifiers of APOE Gene

Stratified Medicine Advances Alzheimer's Disease Research by Identifying Genetic Modifiers of APOE Gene

A comprehensive genome-wide association study (GWAS) meta-analysis, stratified by apolipoprotein E (APOE) status, has provided new insights into the genetic underpinnings of Alzheimer's disease (AD). Researchers grouped individuals into different APOE strata (ε22 + ε32, ε33, and ε44 + ε43) to maximize statistical power and identify genomic signals that modify the effect of the APOE ε4 allele. The study identified 25 loci that reached genome-wide significance, with nine known AD risk loci found in both ε33 and ε44 + ε43 strata. Notably, nine loci were exclusively observed in the ε44 + ε43 stratum, including six known AD loci and three new ones (HP1BP3, PTPRC, DDHD1). Seven loci were exclusively significant in the ε33 stratum, with four known AD risk loci and three new ones (SCL50A1, NPAS3, CHST9). The research also performed interaction tests to identify variants where effect sizes were either attenuated or augmented with the presence of an ε4 allele, revealing genes like SLC50A1, TMEM106B, SHARPIN, and NPA...

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Why former NFL quarterback Matt Hasselbeck is pushing for CTE answers

Why former NFL quarterback Matt Hasselbeck is pushing for CTE answers

Ensworth football assistant and former NFL quarterback Matt Hasselbeck recently volunteered for a large-scale CTE study. Here's why.

Omniscient Receives Third FDA Clearance for AI-Powered Deep Brain Stimulation Platform

Omniscient Receives Third FDA Clearance for AI-Powered Deep Brain Stimulation Platform

Omniscient, a company specializing in applying AI to brain connectomics, has secured its third 510(k) clearance from the U.S. Food and Drug Administration (FDA) for a new workflow within its Quicktome® platform. This new application, Quicktome Deep Brain (DB), extends the benefits of connectomic analysis to deep brain stimulation (DBS) procedures. The clearance marks Omniscient's entry into the neuromodulation market, specifically targeting the growing field of DBS. Quicktome DB aims to provide patient-specific insights for DBS lead placement by utilizing automated, FDA-cleared processing of individual patient imaging. This technology localizes leads, segments deep brain structures, and maps white matter tracts within the brain's networks, moving neurological care towards a more personalized approach. The platform is designed to be HIPAA-compliant and supports Abbott DBS systems, making personalized DBS programming accessible to a wider patient population.

Duke University Engineers Develop Injectable Biomaterial to Repair Stroke Damage in Mice

Duke University Engineers Develop Injectable Biomaterial to Repair Stroke Damage in Mice

Biomedical engineers at Duke University have developed an injectable biomaterial scaffold designed to aid tissue repair following ischemic strokes. This innovative treatment, delivered more than 24 hours after a stroke in mice, works by recruiting the body's own immune cells to promote vascular repair, neural remodeling, and improved motor performance. The biomaterial, known as microporous annealed particle scaffolds (MAPS), transforms the cavity left by a stroke into an environment conducive to healing. Researchers anchored extracellular vesicles (EVs) from astrocytes, which carry signaling molecules, to the hydrogel microparticles of the scaffold. This localized signaling attracts beneficial immune cells, including macrophages and neutrophils, which were previously thought to be primarily inflammatory, but in this context, contribute to repair. The study observed the formation of new blood vessels and increased axonal fibers within and around the damaged brain region in treated mice.

Study Links Elevated Plasma Volume Status to Increased Mortality in Traumatic Brain Injury Patients

Study Links Elevated Plasma Volume Status to Increased Mortality in Traumatic Brain Injury Patients

A recent study analyzing data from the Medical Information Mart for Intensive Care-IV (MIMIC-IV) database, spanning from 2008 to 2022, has found a significant association between elevated Kaplan–Hakim estimated plasma volume status (KH-ePVS) levels and an increased risk of 30-day mortality in patients with traumatic brain injury (TBI). The retrospective cohort analysis included 1,440 TBI patients, revealing that those with higher KH-ePVS levels faced a greater likelihood of death within 30 days of ICU admission. While another method of estimating plasma volume, Duarte-ePVS, was also examined, it did not show a statistically significant relationship with mortality in multivariable analyses. The study highlights the importance of fluid balance in critically ill TBI patients, suggesting that volume overload, indicated by elevated KH-ePVS, could be a critical factor influencing patient outcomes. Researchers adjusted for various confounders, including age, race, and severity of injury, to isolate the impact of ...

New Brain Atlas Reveals Neurons Build Identity Post-Birth, Challenging Traditional Development Concepts

New Brain Atlas Reveals Neurons Build Identity Post-Birth, Challenging Traditional Development Concepts

A new study from the Stowers Institute for Medical Research, led by Assistant Investigator Neşet Özel, Ph.D., has unveiled a detailed developmental atlas of the fruit fly (Drosophila) visual system. This atlas, which mapped 232,251 individual cells across development, reveals that neurons do not simply inherit their identity from parent stem cells. Instead, their identity is actively established during a brief, critical window immediately after birth, when the regulatory landscape of their DNA undergoes dramatic remodeling. The research, published in Proceedings of the National Academy of Sciences, challenges the long-held concept that neuronal identity is a smooth continuation of a predetermined path. The study found that many enhancers associated with neuronal identity were closed in the parent stem cell and only opened after the neuron completed its final cell division. Furthermore, the research indicated that there is no single master regulator dictating identity; instead, each neuron uses its own uniq...

MIT Neuroscientists Develop 'Sleep Syncing' Technique to Enhance Brain's Waste Clearance

MIT Neuroscientists Develop 'Sleep Syncing' Technique to Enhance Brain's Waste Clearance

Neuroscientists Laura Lewis and Joshua Levitt at the Massachusetts Institute of Technology (MIT) have developed a non-invasive technique called 'sleep syncing' to enhance the brain's natural waste-clearing mechanism during sleep. This method involves delivering precisely timed 50-millisecond pulses of pink noise, synchronized with slow-wave peaks during non-REM sleep. The auditory stimulation significantly amplifies slow electrical oscillations across the cortex. These amplified slow waves cause cerebral blood vessels to constrict and dilate with greater rhythm, effectively acting as a biological pump. This action accelerates the inflow and drainage of cerebrospinal fluid (CSF), which is crucial for flushing out toxic protein waste like amyloid-beta and lactic acid that accumulate in the brain during waking hours. The brain, lacking a conventional lymphatic system, relies on this nightly CSF flow to remove metabolic debris.

USC Researchers Develop Blood-Based Algorithm to Enhance Alzheimer's Trial Screening

USC Researchers Develop Blood-Based Algorithm to Enhance Alzheimer's Trial Screening

Researchers at the Keck School of Medicine of the University of Southern California (USC) have developed a blood-plasma screening algorithm designed to improve the efficiency of recruiting participants for Alzheimer's prevention trials. This new tool aims to identify individuals more likely to meet the amyloid thresholds required for trial enrollment, thereby reducing the need for costly and time-consuming positron emission tomography (PET) scans. The algorithm integrates two plasma biomarkers: the amyloid-beta ratio, which indicates early brain amyloid, and phosphorylated tau 217 (p-tau217), a direct marker of amyloid burden. Additionally, age and apolipoprotein E4 (APOE4) carrier status are factored in to refine individual risk estimates. The development of this algorithm utilized data from 1,080 participants in the AHEAD 3-45 phase 3 trial and was validated using an independent cohort from the Wisconsin Registry for Alzheimer’s Prevention. The algorithm was iteratively refined during the AHEAD trial's r...

Scientists Develop WHOLISTIC Method for Whole-Organism Cellular Communication Mapping

Scientists Develop WHOLISTIC Method for Whole-Organism Cellular Communication Mapping

Scientists at the Howard Hughes Medical Institute in the U.S. have developed a new imaging technique called WHOLISTIC (WHole-Organism Live-Imaging System for recording Tissue and IntraCellular activity) that allows for the observation of cellular communication across an entire living organism. This breakthrough, detailed in a study published in Nature, utilizes genetic engineering to make nearly every cell in the body express fluorescent calcium sensors. These sensors illuminate when calcium levels within cells shift, providing real-time insights into cellular activity. The technique has been successfully applied to transparent animals like larval zebrafish and Danionella cerebrum, capturing biological processes such as brainstem-controlled redistribution of body-wide blood flow. This method bridges the gap between cellular and organismal scales of biology, offering an unprecedented view of how the body functions as a whole.

Cancer Treatments Induce Genetic Mutations in Healthy Cells, Impacting Efficacy and Side Effects

Cancer Treatments Induce Genetic Mutations in Healthy Cells, Impacting Efficacy and Side Effects

Recent studies have revealed that various cancer treatments, including chemoradiotherapy and combination chemotherapy, can significantly alter the genetic landscape of normal, healthy tissue. Researchers at the Wellcome Sanger Institute, University of Cambridge, and University College London found that chemoradiotherapy increases mutations in vital tumor suppressor genes like TP53 and PPM1D in human patients. Similarly, combination chemotherapy leads to an increase in normal cells carrying mutations associated with resistance to drugs such as 5-fluorouracil (5-FU). These findings, published in Nature Genetics, indicate that cancer treatments can dramatically change the mutational landscape of normal epithelium within weeks, a process that typically takes decades. The study analyzed normal esophagus tissue from esophageal cancer patients who received different treatments, highlighting how drugs can create a selective pressure that favors the expansion of certain mutant cell clones. This research suggests th...

New AI-Powered Method Discovers Brain's Two-Speed Waste Clearance System During Sleep

New AI-Powered Method Discovers Brain's Two-Speed Waste Clearance System During Sleep

Scientists have developed a new method using physics-informed artificial intelligence (AI) to measure the speed of fluid flow in the brain, revealing a two-speed waste clearance system during sleep. This research, published in Science Advances, was conducted by a team from the University of Rochester, Brown University, and the University of Copenhagen. The study focuses on the glymphatic system, a brain-wide cleanup process that removes metabolic waste, including amyloid beta proteins associated with Alzheimer's disease, during deep sleep. The AI method extracts fluid flow speeds from magnetic resonance imaging (MRI) data, overcoming previous limitations in measuring such slow circulation in living brains. The findings indicate that fluid moves at a few microns per second in more open areas around the brain, but 50 times slower within deeper brain tissue.