Cited by 1,060Alzheimer's disease research and treatmentsAntimicrobial Peptides and ActivitiesNeuroinflammation and Neurodegeneration Mechanisms

The Alzheimer's Disease-Associated Amyloid β-Protein Is an Antimicrobial Peptide

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Soscia, Stephanie J., Kirby, James E., Washicosky, Kevin J., Tucker, Stephanie M., Ingelsson, Martin, Hyman, Bradley, Burton, Mark A., Goldstein, Lee E. +3 more·2010·PLoS ONE

Abstract

BACKGROUND: The amyloid beta-protein (Abeta) is believed to be the key mediator of Alzheimer's disease (AD) pathology. Abeta is most often characterized as an incidental catabolic byproduct that lacks a normal physiological role. However, Abeta has been shown to be a specific ligand for a number of different receptors and other molecules, transported by complex trafficking pathways, modulated in response to a variety of environmental stressors, and able to induce pro-inflammatory activities. METHODOLOGY/PRINCIPAL FINDINGS: Here, we provide data supporting an in vivo function for Abeta as an antimicrobial peptide (AMP). Experiments used established in vitro assays to compare antimicrobial activities of Abeta and LL-37, an archetypical human AMP. Findings reveal that Abeta exerts antimicrobial activity against eight common and clinically relevant microorganisms with a potency equivalent to, and in some cases greater than, LL-37. Furthermore, we show that AD whole brain homogenates have significantly higher antimicrobial activity than aged matched non-AD samples and that AMP action correlates with tissue Abeta levels. Consistent with Abeta-mediated activity, the increased antimicrobial action was ablated by immunodepletion of AD brain homogenates with anti-Abeta antibodies. CONCLUSIONS/SIGNIFICANCE: Our findings suggest Abeta is a hitherto unrecognized AMP that may normally function in the innate immune system. This finding stands in stark contrast to current models of Abeta-mediated pathology and has important implications for ongoing and future AD treatment strategies.

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  • Aβ is an antimicrobial peptide, released by neural cells in response to infectious agents.

    “It is now well known that Aβ is an antimicrobial peptide, released by neural cells in response to infectious agents12,13, so it is not surprising that the presence of bacteria in the brain can result in Aβ deposition reviewed in8.”

    From Chlamydia pneumoniae can infect the central nervous system via the olfactory and trigeminal nerves and contributes to Alzheimer’s disease risk (2022) · cites this paper as [12]

    The Abstract (Methodology/Principal Findings; page unavailable) reports Aβ’s antimicrobial activity, and the Discussion calls it an antimicrobial peptide. But the Discussion presents increased Aβ generation in response to infection as a possibility, not an established finding, and does not show that neural cells release Aβ in response to infectious agents. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Aβ secretion in response to pathogens by (wild-type) neural cells can be rapid.

    “Whilst Aβ deposition is of course much more pronounced in Alzheimer’s disease mouse models, Aβ secretion in response to pathogens by (wild-type) neural cells can be rapid12.”

    From Chlamydia pneumoniae can infect the central nervous system via the olfactory and trigeminal nerves and contributes to Alzheimer’s disease risk (2022) · cites this paper as [12]

    The Discussion proposes that infection could stimulate an innate immune response and subsequent Aβ production in the CNS. It does not report rapid Aβ secretion by wild-type neural cells in response to pathogens; that specific timing and cell-level claim is unsupported. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • In vitro, Aβ42 has been shown to function as an antimicrobial peptide against eight of 12 pathogens being tested, including Escherichia coli, Candida albicans, Staphylococcus epidermidis, Streptococcus pneumoniae, Staphylococcus aureus, Listeria monocytogenes, Enterococcus faecalis, and Streptococcus agalactiae.

    “In vitro, Aβ42 has been shown to function as an antimicrobial peptide against eight of 12 pathogens being tested, including Escherichia coli, Candida albicans, Staphylococcus epidermidis, Streptococcus pneumoniae, Staphylococcus aureus, Listeria monocytogenes, Enterococcus faecalis, and Streptococcus agalactiae [111].”
  • Amyloid-β protein has antimicrobial properties, specifically against Influenza A.

    “Other studies showed that Amyloid-β protein has antimicrobial properties [115], specifically against Influenza A [116]”
  • Amyloid-β has been shown to act as an antimicrobial peptide that may be overproduced in an immunologic mechanism.

    “Aβ has also been shown to act as an antimicrobial peptide that may be overproduced in an immunologic mechanism [115].”

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Authors
Soscia, S. J., Kirby, J. E., Washicosky, K. J., Tucker, S. M., Ingelsson, M., Hyman, B., Burton, M. A., Goldstein, L. E., Duong, S., Tanzi, R. E., & Moir, R. D.
Affiliations
  • Boston University (US)
  • Beth Israel Deaconess Medical Center (US)
  • Massachusetts General Hospital (US)
  • Uppsala University (SE)
  • Harvard University (US)
Corresponding author
Tanzi, Rudolph E.
Venue
PLoS ONE
Published
2010-03-03
Volume
5
Issue
3
Pages
e9505
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2108629610
Cited by
1,060
References
85
Citations by year
2026: 56 · 2025: 68 · 2024: 55 · 2023: 67 · 2022: 83 · 2021: 110 · 2020: 123 · 2019: 71 · 2018: 71 · 2017: 60 · 2016: 56 · 2015: 47 · 2014: 43 · 2013: 33 · 2012: 50
FWCI
31.85
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • OpenBU (Boston University) (submittedVersion, other-oa)
Funders
National Institute of Allergy and Infectious Diseases (R01AI081990)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Immunology and Microbiology › Microbiology › Antimicrobial Peptides and Activities
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
amyloid-beta, Alzheimer's disease, antimicrobial peptides, LL-37, innate immunity, antimicrobial activity, brain homogenate
MeSH terms
Alzheimer Disease, Brain, Candida albicans, Cell Survival, Environment, Humans, Immunity, Innate, Inflammation, Ligands, Microbial Sensitivity Tests, Oxazines, Recombinant Proteins, Xanthenes, Amyloid beta-Peptides, Antimicrobial Cationic Peptides, Cathelicidins

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