What this means
Alzheimer's disease (AD) is a multifactorial progressive neurodegenerative disorder of the elderly characterized by cognitive decline that involves diverse pathological processes. Aging, modulating neuronal instability, is the primary risk factor AD, resulting in dementia, for which a crucial neuropathological feature is the accumulation of amyloid-β (Aβ) plaques wherein suppression of neurosteroids plays important roles.
A plain-English summary is on its way. Until then, this is the start of the authors' own summary.
- Who it was tested in
- Not stated
- Kind of research
- A study
The science
- Original title
- Restoration of StAR-governed neurosteroids with all-trans retinoic acid in alleviating cognitive deficits in a humanized amyloid-β knock-in mouse model of late-onset Alzheimer's disease: New insights into therapeutics.
- Authors
- Marick A, Hemachandra Reddy P, Manna PR
- Journal
- Neurochemistry international
- Published
- Oct 24, 2026
- Study type
- Study
- PMID
- 42926064 ↗
Abstract
Alzheimer's disease (AD) is a multifactorial progressive neurodegenerative disorder of the elderly characterized by cognitive decline that involves diverse pathological processes. Aging, modulating neuronal instability, is the primary risk factor AD, resulting in dementia, for which a crucial neuropathological feature is the accumulation of amyloid-β (Aβ) plaques wherein suppression of neurosteroids plays important roles. Neurosteroidogenesis gradually decreases during aging, and the regulation of neurosteroid biosynthesis is mediated by the steroidogenic acute regulatory (StAR) protein. We demonstrate that treatment with all-trans retinoic acid (atRA, 20 mg/kg, 12-weeks) in humanized Aβ knock-in (hAbKI) mice (11-month old) resulted in increases in hippocampal StAR and sex neurosteroid (estradiol-17β/(E2) in females and testosterone in males) levels, when compared with controls. Elevated StAR and sex neurosteroid levels were associated with reductions in not only Aβ accumulation but also toxic soluble Aβ1-40 and Aβ1-42 peptides in both sexes, emphasizing an inverse correlation between neurosteroidogenesis and AD pathogenesis. Notably, atRA was capable of ameliorating cognitive impairments in both female and male hAbKI mice, as evaluated by Morris Water Maze analyses. These findings provide insights into the mechanistic events by which atRA restores neurosteroid instability, reduces neurotoxicity, and alleviates cognitive impairments in sex-specific hAbKI mice, demonstrating that retinoid therapy could serve as a novel target for the management of AD-related dementia for healthy aging.
Marick A, Hemachandra Reddy P, Manna PR Restoration of StAR-governed neurosteroids with all-trans retinoic acid in alleviating cognitive deficits in a humanized amyloid-β knock-in mouse model of late-onset Alzheimer's disease: New insights into therapeutics. Neurochemistry international. 2026. doi:10.1016/j.neuint.2026.106280. PMID: 42926064. https://pubmed.ncbi.nlm.nih.gov/42926064/
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