Two Proteins, Two Different Reactions<\/p>\n
Alzheimer’s disease is marked by two main types of abnormal protein buildup in the brain: amyloid-beta, which forms sticky plaques between brain cells, and tau, which forms tangles inside them. Scientists have long studied both, but rarely examined how alcohol interacts with each separately.<\/p>\n
Read More on Health<\/p>\n
The research team set out to do exactly that. They focused on the corticostriatal circuit, a brain pathway that helps control decision-making and behavioral flexibility\u2014the ability to adjust behavior when circumstances change<\/a>. This function is often impaired in both addiction and Alzheimer’s disease.<\/p>\n Using animal models representing amyloid-beta pathology and tau pathology separately, the researchers tracked how chronic alcohol exposure changed communication within this circuit.<\/p>\n An Unexpected Reversal<\/p>\n Scientists initially expected alcohol to push each model further in the direction its existing pathology was already headed. Amyloid-beta pathology is typically linked to abnormal increases in brain cell activity, while tau pathology is usually linked to reduced communication between cells. The researchers therefore predicted alcohol would increase circuit activity in the amyloid-beta model and decrease it in the tau model.<\/p>\n Instead, they found the opposite. In animals with amyloid-beta pathology, alcohol reduced communication in the corticostriatal circuit. In animals with tau pathology, alcohol increased it. The same substance produced reversed effects depending on which type of pathology was present.<\/p>\n “The key point for non-experts is not that our study proves alcohol causes Alzheimer’s disease,” the researchers told Newsweek, in a joint statement. “Rather, it suggests that alcohol can meaningfully affect vulnerable brain circuits, and that those effects depend on which Alzheimer’s-related changes are already present. People who are concerned about their brain health or Alzheimer’s risk may wish to be cautious about alcohol and follow their doctor’s advice.<\/p>\n “More broadly, our findings raise new questions about how alcohol, Alzheimer’s-related brain changes, and the brain’s immune responses influence one another\u2014and how alcohol might shape brain-circuit function and the progression of the disease.\u201d<\/p>\n Why It Matters<\/p>\n The findings add to growing evidence that Alzheimer’s disease is not one uniform condition. Differences in disease stage, the specific pathology involved, genetics and lifestyle factors may all shape how a person’s brain responds to outside influences such as alcohol.<\/p>\n That distinction could eventually matter for how doctors think about risk. A blanket warning about alcohol and dementia may be too simple, the researchers suggest, if the underlying brain pathology changes how alcohol acts on neural circuits in the first place.<\/p>\n Dr. Amy Swift, psychiatrist and deputy chief medical officer at Silver Hill Hospital, told Newsweek: “Integrating these nuanced insights into clinical decision-making may be particularly valuable for patients who continue to struggle with alcohol use after receiving a diagnosis of Alzheimer’s disease and related dementia. As our understanding of the underlying mechanisms evolves, treatment approaches should likewise adapt to reflect these biological and phenotypic differences, ultimately supporting more individualized, evidence-informed patient care.”<\/p>\n Reference<\/p>\n Huang, Y., Xie, X., Huang, Z., Gangal, H., Chen, R., Wang, X., Li, J., Wang, J. (2026). Chronic alcohol exposure produces pathology-dependent corticostriatal circuit remodeling in A\u03b2- and tau-based mouse models of Alzheimer’s disease. Neuropharmacology. Chronic alcohol exposure produces pathology-dependent corticostriatal circuit remodeling in A\u03b2- and tau-based mouse models of Alzheimer’s disease – ScienceDirect<\/a><\/p>\n Contact Newsweek editors on this story: Kara Dolman<\/a> and Emma Lee-Sang<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Alcohol may not affect the Alzheimer’s-damaged brain in one single way\u2014instead, its impact appears to depend on which…\n","protected":false},"author":3,"featured_media":926157,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[11],"tags":[2106,4849,210,35293,1183,67,132,68],"class_list":["post-926156","post","type-post","status-publish","format-standard","has-post-thumbnail","category-health","tag-alcohol","tag-alzheimers","tag-health","tag-health-and-science","tag-research","tag-united-states","tag-unitedstates","tag-us"],"share_on_mastodon":{"url":"","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/926156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/comments?post=926156"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/926156\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media\/926157"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media?parent=926156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/categories?post=926156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/tags?post=926156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Cocktails](\"https:\/\/www.europesays.com\/us\/wp-content\/uploads\/2026\/07\/GettyImages-2202138088.jpg\"\/)
<\/p>\n