{"id":404,"date":"2026-08-03T16:32:38","date_gmt":"2026-08-03T16:32:38","guid":{"rendered":"https:\/\/thirstier.news\/?p=404"},"modified":"2026-08-03T16:32:38","modified_gmt":"2026-08-03T16:32:38","slug":"brain-immunity-may-undergo-a-major-midlife-overhaul","status":"publish","type":"post","link":"https:\/\/thirstier.news\/?p=404","title":{"rendered":"Brain immunity may undergo a major midlife overhaul"},"content":{"rendered":"
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Brain immunity may undergo a major midlife overhaul <\/span>
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Thursday, July 23, 2026<\/p>\n

Brain immunity may undergo a major midlife overhaul <\/h1>\n

NIH-supported findings identify a new aspect of human brain aging that may contribute to age-related cognitive decline and dementia risk.<\/p>\n

A National Institutes of Health (NIH)-funded study indicates that the immune cell landscape of the hippocampus, a brain region critical for learning and memory, rapidly undergoes substantial remodeling beginning in midlife. This previously unrecognized shift suggests a potential mechanism by which aging may contribute to chronic neuroinflammation commonly observed in neurodegenerative disease.<\/p>\n

\u201cAging is the single largest risk factor for dementia, but our understanding of how it drives disease is still incomplete,\u201d said Richard Hodes, M.D., director of NIH\u2019s National Institute on Aging (NIA). \u201cThis previously hidden microglial shift, now uncovered by innovations in technology and thinking, may be an important clue to help us complete the puzzle.\u201d<\/p>\n

Using advanced single-cell analysis techniques, a collaborative team of researchers from the University of California, San Diego, the New York Genome Center and the University of California, Irvine analyzed postmortem hippocampal tissue from 40 neurologically healthy adults ranging in age from 20 to 95 years. The findings suggest that the brain\u2019s primary immune cells, called microglia, progressively decline between approximately 50 and 75 years of age, becoming replaced by cells with elevated inflammatory signatures and other features resembling characteristics of peripheral blood-derived immune cells.<\/p>\n

These results call into question the longevity of microglia which emerge during embryonic development, which scientists have long thought renew throughout the human lifespan.<\/p>\n

To investigate how aging affects the human brain at an unprecedented resolution, the researchers applied traditional measures of gene expression alongside more advanced techniques to analyze the genome\u2019s 3D architecture and array of chemical modifications, called the epigenome<\/a>.<\/p>\n

\u201cGene expression tells us what a cell is doing today, but epigenetic signatures preserve information about where a cell came from,\u201d said first author Nathan Zemke, Ph.D., director of single-cell genomics at the UC San Diego Center for Epigenomics. \u201cBy combining these approaches, we uncovered a major shift in the identity and lineage of immune cells in the aging human brain\u2019s immune cells that gene expression data alone would not have revealed.\u201d<\/p>\n

Their findings also indicated that cells known to maintain the protective blood-brain barrier deteriorated with age. And across many brain cell types, aging accompanied a widespread and coordinated disruption of genome architecture.<\/p>\n

\u201cThe progressive structural disruptions were closely linked to shifts in gene regulation and cell identity, potentially revealing a fundamental feature of aging in the human brain,\u201d said Bing Ren, Ph.D., a corresponding author of the study, scientific director and CEO of the New York Genome Center, and professor of genetics and development at Columbia University.\u00a0<\/p>\n

Future studies will investigate the mechanisms driving the loss of resident microglia and determine whether the newly identified immune-cell transition contributes directly to Alzheimer\u2019s disease and other age-related neurological disorders.<\/p>\n

\u201cUnderstanding these cellular transitions may provide new opportunities to develop interventions that preserve brain function and reduce vulnerability to neurodegenerative disease,\u201d said Xiangmin Xu, Ph.D., professor and director of Center for Neural Circuit Mapping at UC Irvine, and a corresponding author of the study.<\/p>\n

NIH supported this research through NIA grants R01AG067153 and R01AG082127 and the\u00a0NIH Common Fund 4D Nucleome<\/a> (4DN) program grant 1U01DA052769. This study is part of a collection of 4DN-supported papers published in Science<\/em> and Science Advances<\/em> that\u00a0offer unprecedented insight into how the human genome\u2019s 3D organization influences development, aging, and a host of diseases.<\/p>\n

About the National Institute on Aging (NIA):<\/strong>\u00a0NIA seeks to understand the nature of aging and diseases associated with growing older, with the goal of extending the healthy, active years of life.\u00a0https:\/\/www.nia.nih.gov<\/a><\/p>\n

About the National Institutes of Health (NIH):<\/strong> NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov<\/a>.<\/p>\n

NIH\u2026Turning Discovery Into Health\u00ae<\/sup><\/p>\n

Reference<\/h3>\n

Nathan\u00a0Zemke\u00a0et al.\u00a0Epigenetic and 3D genome reprogramming during the aging of human hippocampus.\u00a0Science<\/em>. 2026. DOI:\u00a010.1126\/science.adt8307<\/a>\u00a0<\/p>\n

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Institute\/Center<\/h3>\n
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National Institute on Aging (NIA)<\/a><\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n

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Contact<\/h3>\n
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NIH Office of Communications <\/a><\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/article><\/div>\n

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Source: NIH News Releases<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":"

NIH-supported findings identify a new aspect of human brain aging that may contribute to age-related cognitive decline and dementia risk.<\/p>\n","protected":false},"author":1,"featured_media":225,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[],"class_list":["post-404","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-health-medical-research"],"_links":{"self":[{"href":"https:\/\/thirstier.news\/index.php?rest_route=\/wp\/v2\/posts\/404","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thirstier.news\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thirstier.news\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thirstier.news\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thirstier.news\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=404"}],"version-history":[{"count":1,"href":"https:\/\/thirstier.news\/index.php?rest_route=\/wp\/v2\/posts\/404\/revisions"}],"predecessor-version":[{"id":611,"href":"https:\/\/thirstier.news\/index.php?rest_route=\/wp\/v2\/posts\/404\/revisions\/611"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thirstier.news\/index.php?rest_route=\/wp\/v2\/media\/225"}],"wp:attachment":[{"href":"https:\/\/thirstier.news\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=404"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thirstier.news\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=404"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thirstier.news\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=404"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}