新たなゲノム解析によると、アルツハイマー病は皮膚、肺、腸などの臓器での炎症から始まる可能性があり、脳の症状が現れる数十年も前から起こり得る。研究者らは数十万人の遺伝子データを解析し、リスク遺伝子が脳外でより活発に働いていることを発見した。この視点は予防・治療戦略を根本的に変える可能性がある。
アルツハイマー病は伝統的に脳に起源を持つものとされてきたが、詳細なゲノム研究がこの見方を覆している。デンマークのNovo Nordisk Foundation Center for Basic Metabolic Researchに所属するセザール・クーニャ氏とそのチームは、欧州アルツハイマー・認知症バイオバンクから採取したアルツハイマー病患者8万5千人以上と非患者48万5千人の遺伝子データを解析した。また、40の身体部位と100の脳領域にわたる500万の単一細胞における遺伝子活性も評価した。
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Researchers at the University of California, Irvine report that a machine-learning system called SIGNET can infer cause-and-effect links between genes in human brain tissue, revealing extensive rewiring of gene regulation—especially in excitatory neurons—in Alzheimer’s disease.
Building on genomic research linking Alzheimer's origins to inflammation in peripheral tissues like the gut, lungs, or skin, practical lifestyle measures can help curb chronic inflammation. These include vaccination, oral hygiene, diet, exercise, weight control, and stress management, offering benefits for overall health amid evolving science.
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A team of researchers led by Professor Yan-Jiang Wang has published a review arguing that Alzheimer's disease requires integrated treatments targeting multiple factors, not single causes. New drugs like lecanemab and donanemab offer modest benefits by slowing decline, but fall short of reversal. The paper, in Science China Life Sciences, emphasizes genetics, aging, and systemic health alongside amyloid-beta and tau proteins.
A new genetic study indicates that obesity and high blood pressure directly contribute to dementia, beyond merely raising its risk. Researchers from Denmark and the U.K. used advanced methods to establish this causal link, emphasizing prevention through weight and blood pressure management. The findings suggest early interventions could avert vascular-related dementia.
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Researchers at UCLA Health and UC San Francisco have identified a natural defense mechanism in brain cells that helps remove toxic tau protein, potentially explaining why some neurons resist Alzheimer's damage better than others. The study, published in Cell, used CRISPR screening on lab-grown human neurons to uncover this system. Findings suggest new therapeutic avenues for neurodegenerative diseases.
Older adults carrying high-risk APOE4 gene variants experienced slower cognitive decline and lower dementia risk with higher meat consumption, according to a Karolinska Institutet study of over 2,100 participants tracked for up to 15 years. Findings suggest diet's effects on brain health vary by genetics, challenging one-size-fits-all advice.
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A large study of nearly 2 million older adults has found that cerebral amyloid angiopathy, a condition where amyloid proteins build up in brain blood vessels, sharply increases the risk of dementia. Within five years of diagnosis, people with this disorder were four times more likely to develop dementia than those without it, even absent a history of stroke. The findings, drawn from Medicare records, underscore the need for early cognitive screening in affected individuals.