The 3xTg-AD Mouse Model: A Comprehensive Tool for Understanding Alzheimer's Disease.

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• Alzheimer's disease (AD) is a progressive neurodegenerative disorder marked by amyloid-beta (Aβ) plaques, neurofibrillary tangles (NFTs), and cognitive impairment.
• Animal models are essential for studying AD pathogenesis and testing therapeutic interventions.
• The triple-transgenic mouse (3xTg-AD) model overexpresses human AD-linked genes (tau, PSEN1, APP), recapitulating key pathological features.

Purpose of the Study:

• To review the utility and translational potential of the 3xTg-AD mouse model for Alzheimer's disease research.
• To highlight the model's capacity for studying AD pathophysiology, including amyloid and tau deposition, neuroinflammation, and cognitive deficits.
• To assess the model's application in evaluating preclinical therapeutic strategies and identifying biomarkers.

Main Methods:

• Genetic engineering of mice to overexpress human tau, PSEN1, and APP.
• Longitudinal monitoring of pathological hallmarks (Aβ, NFTs) and behavioral deficits (cognitive, anxiety, depression).
• Evaluation of therapeutic interventions including immunotherapy, nutraceuticals (resveratrol), and lifestyle modifications.

Main Results:

• 3xTg-AD mice exhibit age-dependent development of intracellular Aβ, extracellular plaques, and NFTs, mirroring human AD.
• The model displays synaptic dysfunction, neuroinflammation, cognitive deficits, and non-cognitive symptoms.
• The model has shown promise in preclinical studies for assessing treatments aimed at reducing Aβ and tau pathology and improving cognition.

Conclusions:

• The 3xTg-AD mouse is a valuable and versatile preclinical model for Alzheimer's disease research.
• Its ability to replicate key AD pathologies and behavioral phenotypes supports its use in evaluating therapeutic strategies.
• Further integration with multi-omics and human iPSC systems can enhance the translational relevance of findings from this model.