ArticleAlzheimer's & dementia : the journal of the Alzheimer's Association2026
Tau-associated neuronal loss in the intermediate nucleus of the human hypothalamus, a putative VLPO analog, in progressive supranuclear palsy and Alzheimer's disease.
Article in Alzheimer's & dementia : the journal of the Alzheimer's Association, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundSleep phenotypes differ in progressive supranuclear palsy (PSP) and Alzheimer's disease (AD). The human intermediate nucleus (IntN), a putative ventrolateral preoptic analog, promotes non-rapid eye movement (NREM) sleep, but its disease-specific vulnerability is unclear.
methodsPost mortem hypothalami (n = 30; baseline [Braak stage I-II] n = 6; PSP n = 9; Braak III-IV n = 4; Braak V-VI n = 11) underwent marker-guided IntN delineation, galanin/phospho-tau (T231) immunohistochemistry, and stereology.
resultsAdvanced PSP showed profound IntN degeneration (84% neuron reduction vs baseline). In AD neuropathologic change, IntN neuronal loss and phospho-tau burden were greater in higher Braak stages and preferentially affected galanin-positive neurons (≈77% reduction in late AD); phospho-tau burden was higher in galanin-positive neurons.
conclusionsThe IntN is a disease-sensitive node, with near-ablation in PSP and progressive, preferential loss of detectable galaninergic neurons in AD. Although longitudinal observations and premortem sleep/wake measurements were not available for this sample, these findings are consistent with disease-level differences in NREM/ slow-wave sleep disturbance reported in PSP and AD.
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