Sex differences in β-amyloid accumulation in 3xTg-AD mice: Role of neonatal sex steroid hormone exposure
Open accessAbstract
The risk of Alzheimer's disease (AD) is higher in women than in men, a sex difference that likely results from the effects of sex steroid hormones. To investigate this relationship, we first compared progression of β-amyloid (Aβ) pathology in male and female triple transgenic (3xTg-AD) mice. We found that female 3xTg-AD mice exhibit significantly greater Aβ burden and larger behavioral deficits than age-matched males. Next, we evaluated how the organizational effects of sex steroid hormones during postnatal development may affect adult vulnerability to Aβ pathology. We observed that male 3xTg-AD mice demasculinized during early development exhibit significantly increased Aβ accumulation in adulthood. In contrast, female mice defeminized during early development exhibit a more male-like pattern of Aβ pathology in adulthood. Taken together, these results demonstrate significant sex differences in pathology in 3xTg-AD mice and suggest that these differences may be mediated by organizational actions of sex steroid hormones during development.
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Only female mice were used because AD pathology development is far less pronounced and more variable in male 3xTg-AD mice.
“Only female mice were used in this study since the development of AD pathology is far less pronounced and more variable in male 3xTg-AD mice [18,19].”
From Brain microstructure abnormalities in the 3xTg-AD mouse – A diffusion MRI and morphology correlation study (2022) · cites this paper as [19]
The Results section ('Female 3xTg-AD mice display higher levels of Aβ immunoreactivity than males'; page unavailable) reports greater Aβ loads and more plaques in females than in age-matched males. This supports less pronounced amyloid pathology in males, but the paper does not establish that pathology development in males is more variable. 'Only female mice were used' describes the citing study, not this source. (LLM, conf=0.86)
Experimental — accuracy not yet measuredMale 3xTg-AD mice no longer consistently exhibit plaque and tangle pathology.
“Since the initial generation of the model, it has been described by multiple groups and confirmed by the donating investigator that male 3xTg-AD mice no longer consistently exhibit plaque and tangle pathology [23–25].”
From Age, sex and Alzheimer’s disease: a longitudinal study of 3xTg-AD mice reveals sex-specific disease trajectories and inflammatory responses mirrored in postmortem brains from Alzheimer’s patients (2024) · cites this paper as [23]
The Results (page unavailable) report fewer plaques in 12–14-month-old males than females, supporting a sex difference in plaque burden. They do not establish that males have ceased to exhibit plaques consistently. The Discussion (page unavailable) says tau pathology was not evaluated, and the paper does not document a loss of plaque-and-tangle pathology since the model’s initial generation. (LLM, conf=0.82)
Experimental — accuracy not yet measuredThe present study's focus on male 3×Tg-AD mice at 9 months of age may limit the generalizability of our findings to the broader patient population.
“One limitation of the present study is its focus on male 3×Tg-AD mice at 9 months of age, which may limit the generalizability of our findings to the broader patient population (Carroll et al., 2010).”
From Multimodal MRI combined with RNA sequencing reveals pathological signatures in the 9-month-old 3×Tg-AD mouse brain (2026) · cites this paper as Carroll et al., 2010
These results align with published literature and reinforce the translatability of the 3xTg-AD model.
“Together, these results align with published literature [20, 21, 23, 24, 26, 27] and reinforce the translatability of the 3xTg-AD model.”
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- Authors
- Carroll, J. C., Rosario, E. R., Kreimer, S., Villamagna, A., Gentzschein, E., Stanczyk, F. Z., & Pike, C. J.
- Affiliations
- University of Southern California (US)
- Corresponding author
- Pike, Christian J.
- Venue
- Brain Research
- Publisher
- Elsevier BV
- Published
- 2010-12
- Volume
- 1366
- Pages
- 233-245
- ISSN
- 0006-8993 (ISSN-L)
- PMC
- PMC2993873
- OpenAlex
- W2072193814
- Cited by
- 273
- References
- 119
- Citations by year
- 2026: 11 · 2025: 26 · 2024: 31 · 2023: 15 · 2022: 25 · 2021: 27 · 2020: 33 · 2019: 24 · 2018: 27 · 2017: 13 · 2016: 12 · 2015: 11 · 2014: 5 · 2013: 4 · 2012: 7
- FWCI
- 2.82
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Brain Research (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- NIH (AG23739, AG026572, F31NS059174, NS52143)
- Topics
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Keywords
- sex differences, amyloid-beta deposition, Alzheimer's disease, 3xTg-AD mice, sex hormones, organizational effects, neonatal hormone exposure, demasculinization, defeminization, postnatal development, amyloid pathology, behavioral deficits
- MeSH terms
- Age Factors, Analysis of Variance, Androgen Antagonists, Androgens, Animals, Animals, Newborn, Brain, Exploratory Behavior, Female, Flutamide, Humans, Male, Mice, Transgenic, Mutation, Orchiectomy, Ovariectomy, Sexual Behavior, Animal, Sex Characteristics, Testosterone, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, tau Proteins, Maze Learning, Mice, Presenilin-1
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