{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,11]],"date-time":"2026-11-11T00:47:12Z","timestamp":1794358032632,"version":"4.9.0"},"reference-count":103,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,1,16]],"date-time":"2026-01-16T00:00:00Z","timestamp":1768521600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000005","name":"Department of Defense","doi-asserted-by":"publisher","award":["W81XWH-21-1-083"],"award-info":[{"award-number":["W81XWH-21-1-083"]}],"id":[{"id":"10.13039\/100000005","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01NS132672"],"award-info":[{"award-number":["R01NS132672"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000005","name":"Department of Defense","doi-asserted-by":"publisher","award":["EP230013"],"award-info":[{"award-number":["EP230013"]}],"id":[{"id":"10.13039\/100000005","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Neurosci."],"abstract":"<jats:p>Each year, approximately 2.9 million people in the United States sustain a traumatic brain injury (TBI), many of whom go on to experience chronic secondary complications such as post-traumatic epilepsy (PTE) and sleep\u2013wake disturbances. These outcomes arise from complex secondary injury processes, including neuroinflammation, oxidative stress, and disruptions in neuroendocrine signaling. While inflammatory and excitotoxic mechanisms have been extensively studied, growing evidence highlights sex hormone dysregulation\u2014particularly involving estrogen, progesterone, and testosterone\u2014as an important yet underrecognized contributor to post-TBI physiology. Clinical and preclinical studies indicate that TBI can alter systemic and brain-derived hormone levels, influencing neuroinflammation, glial activation, neuronal survival, and synaptic plasticity. These hormone-related changes have been associated with altered seizure susceptibility and disrupted sleep architecture, suggesting that sex hormone dysregulation may represent one interacting pathway influencing both outcomes. Additionally, the bidirectional relationship between epilepsy and sleep\u2014where seizures disrupt sleep architecture and sleep loss increases cortical excitability\u2014may further compound vulnerability after TBI. Given the heterogeneity of injury mechanisms and hormonal responses across individuals, these relationships remain incompletely understood but biologically plausible. This narrative review examines how TBI-related alterations in estrogen, progesterone, and testosterone may intersect with sleep regulation and seizure susceptibility. We summarize their physiological roles in the brain, evaluate how post-injury disruptions may shape chronic outcomes, and highlight how early identification of hormonal abnormalities could inform future research on therapeutic strategies. By addressing this understudied interface between endocrine, neural, and behavioral dysfunction, we aim to advance understanding of modifiable pathways that may contribute to long-term morbidity after TBI.<\/jats:p>","DOI":"10.3389\/fnins.2026.1672744","type":"journal-article","created":{"date-parts":[[2026,1,16]],"date-time":"2026-01-16T05:21:25Z","timestamp":1768540885000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Sex hormone dysregulation after traumatic brain injury: interactions with sleep disturbances and seizure susceptibility"],"prefix":"10.3389","volume":"20","author":[{"given":"Isabella S.","family":"Elkinbard","sequence":"first","affiliation":[{"name":"Department of Integrative Physiology, University of Colorado Boulder","place":["Boulder, CO, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dana","family":"Ritterbusch","sequence":"additional","affiliation":[{"name":"Department of Integrative Physiology, University of Colorado Boulder","place":["Boulder, CO, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oleksii","family":"Shandra","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Florida International University","place":["Miami, FL, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachel K.","family":"Rowe","sequence":"additional","affiliation":[{"name":"Department of Integrative Physiology, University of Colorado Boulder","place":["Boulder, CO, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,1,16]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"584","DOI":"10.1111\/j.1365-2265.2004.02023.x","article-title":"Neuroendocrine dysfunction in the acute phase of traumatic brain injury","volume":"60","author":"Agha","year":"2004","journal-title":"Clin. 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