Renin-Angiotensin System Modulation in Cognitive Health
Summary
The renin–angiotensin system (RAS) is a multifunctional hormonal cascade long recognised for its central role in cardiovascular homeostasis. Beyond blood pressure regulation and fluid balance, components of the RAS exert direct effects on neuronal survival, synaptic plasticity and neuroinflammation. In the classical axis, angiotensin-converting enzyme (ACE) generates angiotensin II (Ang II), which binds to the AT1 receptor (AT1R) to promote vasoconstriction, oxidative stress and pro-inflammatory signalling. A counter-regulatory axis centred on angiotensin-converting enzyme 2 (ACE2) produces angiotensin (1-7), signalling via the Mas receptor to oppose AT1R-mediated damage. Modulation of these opposing pathways has emerged as a promising approach to preserve cognitive function in ageing and neurodegenerative disease. Pharmacological inhibition of ACE or blockade of AT1R shifts the balance towards neuroprotective signalling, attenuating amyloid-β accumulation, tau phosphorylation and microglial activation. Concurrent enhancement of ACE2 activity further elevates angiotensin (1-7) levels, strengthening synaptic resilience and reducing vascular dysfunction. Collectively, experimental and clinical data indicate that fine-tuning the RAS offers a dual strategy of vascular protection and direct neuroprotection, with potential to delay or mitigate cognitive decline across diverse populations.
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Technical terms
Renin–Angiotensin System (RAS): A hormone network that regulates vascular tone, fluid balance and tissue remodelling through peptide-receptor interactions.
Angiotensin-Converting Enzyme (ACE): A metalloprotease that converts angiotensin I into angiotensin II, driving classical RAS effects.
Angiotensin-Converting Enzyme 2 (ACE2): An enzyme that degrades angiotensin II into angiotensin (1-7), mediating protective counter-regulatory signalling.
Angiotensin II Type 1 Receptor (AT1R): A G-protein-coupled receptor activated by angiotensin II to induce vasoconstriction, oxidative stress and inflammation.
Angiotensin Receptor Blockers (ARBs): A class of drugs that selectively antagonise AT1R, shifting RAS balance towards neuroprotective pathways.
Amyloid-β (Aβ): A peptide fragment prone to aggregation in Alzheimer’s disease, implicated in synaptic dysfunction and neurotoxicity.
References
- ACE2 activation protects against cognitive decline and reduces amyloid pathology in the Tg2576 mouse model of Alzheimer’s disease. Acta Neuropathologica (2020).
- Memory is preserved in older adults taking AT1 receptor blockers. Alzheimer's Research & Therapy (2017).
- Protein Expression of Angiotensin-Converting Enzyme 2 (ACE2) is Upregulated in Brains with Alzheimer’s Disease. International Journal of Molecular Sciences (2021).
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