Cited by 279Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

Herpes Simplex Virus Type 1 and Other Pathogens are Key Causative Factors in Sporadic Alzheimer’s Disease

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Harris, Steven A., Harris, Elizabeth A.·2015·Journal of Alzheimer's Disease

Abstract

This review focuses on research in epidemiology, neuropathology, molecular biology, and genetics regarding the hypothesis that pathogens interact with susceptibility genes and are causative in sporadic Alzheimer's disease (AD). Sporadic AD is a complex multifactorial neurodegenerative disease with evidence indicating coexisting multi-pathogen and inflammatory etiologies. There are significant associations between AD and various pathogens, including Herpes simplex virus type 1 (HSV-1), Cytomegalovirus, and other Herpesviridae, Chlamydophila pneumoniae, spirochetes, Helicobacter pylori, and various periodontal pathogens. These pathogens are able to evade destruction by the host immune system, leading to persistent infection. Bacterial and viral DNA and RNA and bacterial ligands increase the expression of pro-inflammatory molecules and activate the innate and adaptive immune systems. Evidence demonstrates that pathogens directly and indirectly induce AD pathology, including amyloid-β (Aβ) accumulation, phosphorylation of tau protein, neuronal injury, and apoptosis. Chronic brain infection with HSV-1, Chlamydophila pneumoniae, and spirochetes results in complex processes that interact to cause a vicious cycle of uncontrolled neuroinflammation and neurodegeneration. Infections such as Cytomegalovirus, Helicobacter pylori, and periodontal pathogens induce production of systemic pro-inflammatory cytokines that may cross the blood-brain barrier to promote neurodegeneration. Pathogen-induced inflammation and central nervous system accumulation of Aβ damages the blood-brain barrier, which contributes to the pathophysiology of AD. Apolipoprotein E4 (ApoE4) enhances brain infiltration by pathogens including HSV-1 and Chlamydophila pneumoniae. ApoE4 is also associated with an increased pro-inflammatory response by the immune system. Potential antimicrobial treatments for AD are discussed, including the rationale for antiviral and antibiotic clinical trials.

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  1. [129]Miklossy J 1994 The spirochetal etiology of Alzheimer’s disease: A putative therapeutic approach Giacobini E Becker R In Alzheimer Disease: Therapeutic Strategies. Proceedings of the Third International Springfield Alzheimer Symposium 41 48 Birkhauser Boston

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Authors
Harris, S. A., & Harris, E. A.
Affiliations
  • St Vincent Hospital (US)
  • Indiana University School of Medicine (US)
Corresponding author
Harris, Steven A.
Venue
Journal of Alzheimer's Disease
Published
2015-09-09
Volume
48
Issue
2
Pages
319-353
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W2213335032
Cited by
279
References
274
Citations by year
2026: 12 · 2025: 13 · 2024: 17 · 2023: 59 · 2022: 23 · 2021: 29 · 2020: 30 · 2019: 26 · 2018: 29 · 2017: 23 · 2016: 16 · 2015: 1 · 2014: 1
FWCI
2.82
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Alzheimer s Disease (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion, cc-by-nc)
  • Publisher
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
sporadic Alzheimer's disease, herpes simplex virus type 1
MeSH terms
Alzheimer Disease, Animals, Brain, Herpes Simplex, Humans, Herpesvirus 1, Human

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