Key Highlights
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A large study of over 370,000 people found that a higher neutrophil-to-lymphocyte ratio (NLR), a simple blood test marker for inflammation, is linked to a greater risk of developing Alzheimer’s disease and related dementias. This suggests that chronic, body-wide inflammation, particularly involving immune cells called neutrophils, could be a key player in the development of neurodegenerative diseases, opening new avenues for early detection and prevention strategies.
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Research using a mouse model of a genetic condition linked to autism and hyperactivity (16p11.2 hemideletion) shows that the body’s “complement” immune system, which helps clear away unwanted cells, contributes to the hyperactive behavior seen in these mice. This finding points to the immune system as a potential new target for developing treatments for neurodevelopmental disorders that involve hyperactivity.
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A major analysis of brain scans from an international PTSD research group found altered connections between two key emotional memory centers—the amygdala and hippocampus—in people with post-traumatic stress disorder. This provides strong, consistent biological evidence for how trauma can change the brain’s wiring, which could help in developing more objective diagnostic tools and targeted therapies.
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