Cited by 161Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Time to test antibacterial therapy in Alzheimer’s disease

Open access
Panza, Francesco, Lozupone, Madia, Solfrizzi, Vincenzo, Watling, Mark, Imbimbo, Bruno P·2019·Brain

Abstract

Alzheimer’s disease is associated with cerebral accumulation of amyloid-β peptide and hyperphosphorylated tau. In the past 28 years, huge efforts have been made in attempting to treat the disease by reducing brain accumulation of amyloid-β in patients with Alzheimer’s disease, with no success. While anti-amyloid-β therapies continue to be tested in prodromal patients with Alzheimer’s disease and in subjects at risk of developing Alzheimer’s disease, there is an urgent need to provide therapeutic support to patients with established Alzheimer’s disease for whom current symptomatic treatment (acetylcholinesterase inhibitors and N-methyl d-aspartate antagonist) provide limited help. The possibility of an infectious aetiology for Alzheimer’s disease has been repeatedly postulated over the past three decades. Infiltration of the brain by pathogens may act as a trigger or co-factor for Alzheimer’s disease, with Herpes simplex virus type 1, Chlamydia pneumoniae, and Porphyromonas gingivalis being most frequently implicated. These pathogens may directly cross a weakened blood–brain barrier, reach the CNS and cause neurological damage by eliciting neuroinflammation. Alternatively, pathogens may cross a weakened intestinal barrier, reach vascular circulation and then cross blood–brain barrier or cause low grade chronic inflammation and subsequent neuroinflammation from the periphery. The gut microbiota comprises a complex community of microorganisms. Increased permeability of the gut and blood–brain barrier induced by microbiota dysbiosis may impact Alzheimer’s disease pathogenesis. Inflammatory microorganisms in gut microbiota are associated with peripheral inflammation and brain amyloid-β deposition in subjects with cognitive impairment. Oral microbiota may also influence Alzheimer’s disease risk through circulatory or neural access to the brain. At least two possibilities can be envisaged to explain the association of suspected pathogens and Alzheimer’s disease. One is that patients with Alzheimer’s disease are particularly prone to microbial infections. The other is that microbial infection is a contributing cause of Alzheimer’s disease. Therapeutic trials with antivirals and/or antibacterials could resolve this dilemma. Indeed, antiviral agents are being tested in patients with Alzheimer’s disease in double-blind placebo-controlled studies. Although combined antibiotic therapy was found to be effective in animal models of Alzheimer’s disease, antibacterial drugs are not being widely investigated in patients with Alzheimer’s disease. This is because it is not clear which bacterial populations in the gut of patients with Alzheimer’s disease are overexpressed and if safe, selective antibacterials are available for them. On the other hand, a bacterial protease inhibitor targeting P. gingivalis toxins is now being tested in patients with Alzheimer’s disease. Clinical studies are needed to test if countering bacterial infection may be beneficial in patients with established Alzheimer’s disease.

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Authors
Panza, F., Lozupone, M., Solfrizzi, V., Watling, M., & Imbimbo, B. P.
Affiliations
  • Gastroenterology Hospital "Saverio de Bellis" (IT)
  • University of Bari Aldo Moro (IT)
  • Chiesi (Italy) (IT)
Corresponding author
Panza, Francesco
Venue
Brain
Published
2019-08-29
Volume
142
Issue
10
Pages
2905-2929
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2973900732
Cited by
161
References
258
Citations by year
2026: 4 · 2025: 19 · 2024: 19 · 2023: 23 · 2022: 28 · 2021: 39 · 2020: 26 · 2019: 3
FWCI
2.83
Type
journal article
Language
en
Open access
Locations
  • Brain (publishedVersion)
  • PubMed (publishedVersion)
  • CINECA IRIS Institutional Research Information System (University of Bari Aldo Moro) (submittedVersion, cc-by-nc-nd)
Funders
Fondazione Dieta Mediterranea
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Alzheimer's disease, antibiotic therapy, amyloid-beta, tau hyperphosphorylation, infectious etiology, neuroinflammation, blood-brain barrier, gut microbiota, dysbiosis, gut-brain axis, Porphyromonas gingivalis, Chlamydia pneumoniae, herpes simplex virus type 1, antiviral therapy
MeSH terms
Gastrointestinal Microbiome, Alzheimer Disease, Animals, Anti-Bacterial Agents, Brain, Disease Models, Animal, Double-Blind Method, Humans, Inflammation, Placebos, Neuroimmunomodulation, Amyloid beta-Peptides, Cognitive Dysfunction, Microbiota

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