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The glymphatic system clears amyloid beta and tau from brain to plasma in humans

2 months 1 week ago
Dysfunction of the glymphatic system has been proposed as a mechanistic link between sleep disruption and Alzheimer's disease (AD). In animal models, glymphatic impairment alone can drive AD pathology. Whether this system clears amyloid beta (Aβ) and tau in humans remains unknown. In a randomized crossover trial with 39 participants, we found that glymphatic clearance during normal sleep increased morning plasma levels of AD biomarkers compared to sleep deprivation. Participants underwent...
Paul Dagum

Clonal CD8<sup>+</sup> T cells populate the leptomeninges and coordinate with immune cells in human degenerative brain diseases

2 months 1 week ago
Meningeal immune cells monitor the central nervous system (CNS) and influence neuroinflammation in mice, but the human leptomeningeal immune landscape and the changes that occur in this immunological niche in neurodegeneration remain underexplored. Here we performed single-cell RNA and T cell receptor (TCR) sequencing of 99,625 high-quality immune cells from 57 leptomeninges and brain samples from donors with Alzheimer's disease (AD), amyotrophic lateral sclerosis and Parkinson's disease and...
Ryan Hobson

Age-related diversity of the oral and gut microbiome and its correlation with systemic fatty acids and cytokine profiles in healthy subjects

2 months 1 week ago
CONCLUSION: To our knowledge, this study is the first to characterize and correlate the diversity of both the OM and GM with systemic FFA and cytokine profiles in a cohort of healthy adults, highlighting the critical role of age in shaping microbiome composition and associated metabolites. Integrating microbiota profiling with serum FFA and cytokine measurements enhances our understanding of how the microbiome may influence health and disease risk across the adult lifespan.
Itzel Ivonn López-Tenorio