Cited by 203Renin-Angiotensin System StudiesAlzheimer's disease research and treatmentsDementia and Cognitive Impairment Research

Angiotensin-converting enzyme 2 is reduced in Alzheimer’s disease in association with increasing amyloid-β and tau pathology

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Kehoe, Patrick Gavin, Wong, Steffenny, AL Mulhim, Noura, Palmer, Laura Elyse, Miners, J. Scott·2016·Alzheimer's Research & Therapy

Abstract

Background: Hyperactivity of the classical axis of the renin-angiotensin system (RAS), mediated by angiotensin II (Ang II) activation of the angiotensin II type 1 receptor (AT1R), is implicated in the pathogenesis of Alzheimer’s disease (AD). Angiotensin-converting enzyme-2 (ACE-2) degrades Ang II to angiotensin 1–7 (Ang (1-7)) and counter-regulates the classical axis of RAS. We have investigated the expression and distribution of ACE-2 in post-mortem human brain tissue in relation to AD pathology and classical RAS axis activity. Methods: We measured ACE-2 activity by fluorogenic peptide substrate assay in mid-frontal cortex (Brodmann area 9) in a cohort of AD (n = 90) and age-matched non-demented controls (n = 59) for which we have previous data on ACE-1 activity, amyloid β (Aβ) level and tau pathology, as well as known ACE1 (rs1799752) indel polymorphism, apolipoprotein E (APOE) genotype, and cerebral amyloid angiopathy severity scores. Results: ACE-2 activity was significantly reduced in AD compared with age-matched controls (P < 0.0001) and correlated inversely with levels of Aβ (r = −0.267, P < 0.001) and phosphorylated tau (p-tau) pathology (r = −0.327, P < 0.01). ACE-2 was reduced in individuals possessing an APOE ε4 allele (P < 0.05) and was associated with ACE1 indel polymorphism (P < 0.05), with lower ACE-2 activity in individuals homozygous for the ACE1 insertion AD risk allele. ACE-2 activity correlated inversely with ACE-1 activity (r = −0.453, P < 0.0001), and the ratio of ACE-1 to ACE-2 was significantly elevated in AD (P < 0.0001). Finally, we show that the ratio of Ang II to Ang (1–7) (a proxy measure of ACE-2 activity indicating conversion of Ang II to Ang (1–7)) is reduced in AD. Conclusions: Together, our findings indicate that ACE-2 activity is reduced in AD and is an important regulator of the central classical ACE-1/Ang II/AT1R axis of RAS, and also that dysregulation of this pathway likely plays a significant role in the pathogenesis of AD.

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Authors
Kehoe, P. G., Wong, S., AL Mulhim, N., Palmer, L. E., & Miners, J. S.
Affiliations
Southmead Hospital (GB)
Corresponding author
  • Kehoe, Patrick Gavin
  • Miners, J. Scott
Venue
Alzheimer's Research & Therapy
Published
2016-11-25
Volume
8
Issue
1
Pages
50-50
ISSN
1758-9193 (ISSN-L)
OpenAlex
W2551207780
Cited by
203
References
75
Citations by year
2026: 7 · 2025: 17 · 2024: 13 · 2023: 33 · 2022: 27 · 2021: 46 · 2020: 38 · 2019: 6 · 2018: 12 · 2017: 4
FWCI
6.04
Type
journal article
Language
en
Open access
Locations
  • Alzheimer s Research & Therapy (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Bristol Research (University of Bristol) (publishedVersion, cc-by)
  • Explore Bristol Research (submittedVersion, cc-by)
Funders
  • Alzheimer's Society
  • University of Bristol
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Renin-Angiotensin System Studies
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, angiotensin-converting enzyme 2, renin-angiotensin system, angiotensin II, angiotensin-(1-7), amyloid-beta, tau phosphorylation, APOE ε4, cerebral amyloid angiopathy, postmortem brain
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Analysis of Variance, Angiotensin I, Angiotensin II, Apolipoproteins E, Autopsy, Brain, Female, Humans, Peptidyl-Dipeptidase A, Male, Peptide Fragments, Statistics as Topic, Cohort Studies, Case-Control Studies, Amyloid beta-Peptides, tau Proteins, Polymorphism, Single Nucleotide

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