Alzheimer’s disease may be driven by a vicious cycle where amyloid beta proteins and reduced blood flow push each other forward, according to a new whole-brain model from researchers at Politecnico di Milano and the University of Oxford.
The Research
Mattia Corti, Andrew Ahern, Alain Goriely, Ellen Kuhl, and Paola F. Antonietti published a study in Computer Methods in Applied Mechanics and Engineering (2026) that couples a reaction-diffusion system for amyloid beta dynamics with a porous-medium model of blood flow through arterial, capillary, and venous networks. The team used high-order discontinuous Galerkin methods and implicit Euler time stepping to solve the resulting partial differential equations on realistic brain geometries.
Their simulations revealed multistability—meaning that a sufficiently large “seed” of pathogenic amyloid beta is necessary to trigger a full disease outbreak. More strikingly, the model supported the “two-hit vascular hypothesis”: localized hypoperfusion (reduced blood flow), such as from a minor injury, can destabilize the healthy steady state and cause amyloid beta pathology to spread throughout the brain.
Why It Matters
This study provides a mathematical framework for understanding how vascular health and protein accumulation interact in Alzheimer’s. For the general reader, it underscores that maintaining good cardiovascular health—via exercise, diet, and managing blood pressure—may help reduce the risk of Alzheimer’s by preventing the initial “hit” of hypoperfusion.
What You Can Do
- Engage in regular aerobic exercise to boost cerebral blood flow.
- Follow a heart-healthy diet (e.g., Mediterranean) to support vascular function.
- Monitor and manage blood pressure and cholesterol with your doctor.
Source: arXiv q-bio.NC
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