Excess orexin-A worsens AD cognition through wake-driven amyloid production

Mechanistic description

Chronic orexin-A elevation may aggravate AD by extending wakefulness, fragmenting circadian rhythms, and increasing activity-dependent amyloid/tau release. Lowering orexin tone should improve pathology only when it normalizes sleep rather than causing broad hypoarousal.

Mechanism / pathway

HCRT
→
arousal-driven amyloid production
→
neurodegeneration

Evidence for (8)

Orexin-A aggravates cognitive deficits in 3xTg-AD mice
Sleep-wake regulation literature linking arousal to interstitial amyloid dynamics
Orexins and orexin receptors: a family of hypothalamic neuropeptides and G protein-coupled receptors that regulate feeding behavior.

PMID:9491897 1998 Cell
Interaction between Aβ and Tau in the Pathogenesis of Alzheimer's Disease.

PMID:34239348 2021 Int J Biol Sci
Site-Specific Phospho-Tau Aggregation-Based Biomarker Discovery for AD Diagnosis and Differentiation.

PMID:36350059 2022 ACS Chem Neurosci
Quantitative Assessment of Hippocampal Tau Pathology in AD and PART.

PMID:32372343 2020 J Mol Neurosci
Roles of Microglia in AD Pathology.

PMID:36740796 2023 Curr Alzheimer Res
TDP-43 pathology is associated with increased tau burdens and seeding.

PMID:37777806 2023 Mol Neurodegener

Evidence against (2)

Hypocretins (orexins): The ultimate translational neuropeptides.

PMID:35043499 2022 J Intern Med

Evidence matrix

6 supporting 1 contradicting

86% supporting

Supporting

Orexins and orexin receptors: a family of hypothalamic neuropeptides and G protein-coupled receptors that regulate feeding behavior. PMID:9491897 · 1998 · Cell
Interaction between Aβ and Tau in the Pathogenesis of Alzheimer's Disease. PMID:34239348 · 2021 · Int J Biol Sci
Site-Specific Phospho-Tau Aggregation-Based Biomarker Discovery for AD Diagnosis and Differentiation. PMID:36350059 · 2022 · ACS Chem Neurosci
Quantitative Assessment of Hippocampal Tau Pathology in AD and PART. PMID:32372343 · 2020 · J Mol Neurosci
Roles of Microglia in AD Pathology. PMID:36740796 · 2023 · Curr Alzheimer Res
TDP-43 pathology is associated with increased tau burdens and seeding. PMID:37777806 · 2023 · Mol Neurodegener

Contradicting

Hypocretins (orexins): The ultimate translational neuropeptides. PMID:35043499 · 2022 · J Intern Med

Cite this hypothesis

Citation

etl-backfill (2026). Excess orexin-A worsens AD cognition through wake-driven amyloid production. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-5edc4a7e0558

BibTeX

@misc{scidex_hypothesis_h5edc4a7,
  title        = {Excess orexin-A worsens AD cognition through wake-driven amyloid production},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-5edc4a7e0558},
  note         = {SciDEX artifact hypothesis:h-5edc4a7e0558}
}