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Multi-pathogen infections and Alzheimer's disease
Dana Vigasova1,2, Michal Nemergut2, Barbora Liskova2
1International Clinical Research Center, St. Anne's University Hospital Brno, Pekarska 53, 656 91, Brno, Czech Republic.
Abstract:
Alzheimer's disease (AD) is a chronic neurodegenerative disease associated with the overproduction and accumulation of amyloid-β peptide and hyperphosphorylation of tau proteins in the brain. Despite extensive research on the amyloid-based mechanism of AD pathogenesis, the underlying cause of AD is not fully understood. No disease-modifying therapies currently exist, and numerous clinical trials have failed to demonstrate any benefits. The recent discovery that the amyloid-β peptide has antimicrobial activities supports the possibility of an infectious aetiology of AD and suggests that amyloid-β plaque formation might be induced by infection. AD patients have a weakened blood-brain barrier and immune system and are thus at elevated risk of microbial infections. Such infections can cause chronic neuroinflammation, production of the antimicrobial amyloid-β peptide, and neurodegeneration. Various pathogens, including viruses, bacteria, fungi, and parasites have been associated with AD. Most research in this area has focused on individual pathogens, with herpesviruses and periodontal bacteria being most frequently implicated. The purpose of this review is to highlight the potential role of multi-pathogen infections in AD. Recognition of the potential coexistence of multiple pathogens and biofilms in AD's aetiology may stimulate the development of novel approaches to its diagnosis and treatment. Multiple diagnostic tests could be applied simultaneously to detect major pathogens, followed by anti-microbial treatment using antiviral, antibacterial, antifungal, and anti-biofilm agents.
Insights
Alzheimer's disease may be triggered by multiple infections, not just one pathogen. Identifying and treating various microbes could lead to new diagnostic and treatment strategies for this neurodegenerative condition.
Area of Science:
- Neuroscience
- Infectious Diseases
- Pathology
Background:
- Alzheimer's disease (AD) is a neurodegenerative disorder linked to amyloid-beta and tau pathology.
- Current AD treatments are not disease-modifying, and many clinical trials have failed.
- The amyloid-beta peptide's antimicrobial function suggests infection may initiate AD.
Purpose of the Study:
- To review the potential role of multi-pathogen infections in Alzheimer's disease etiology.
- To explore how co-existing pathogens and biofilms might contribute to AD pathogenesis.
- To propose novel diagnostic and therapeutic strategies based on a multi-pathogen infection model.
Main Methods:
- Literature review focusing on infectious agents implicated in Alzheimer's disease.
- Analysis of the link between microbial infections, neuroinflammation, and neurodegeneration in AD.
- Synthesis of evidence supporting a multi-pathogen hypothesis for AD.
Main Results:
- Alzheimer's patients exhibit increased susceptibility to infections due to compromised blood-brain barrier and immune function.
- Chronic neuroinflammation and neurodegeneration can result from various microbial infections (viral, bacterial, fungal, parasitic).
- Herpesviruses and periodontal bacteria are frequently associated with AD, but multi-pathogen involvement is likely.
Conclusions:
- Recognizing the potential for multiple pathogens and biofilms in AD etiology is crucial.
- Simultaneous diagnostic testing for major pathogens could improve detection rates.
- Developing multi-antimicrobial treatments (antiviral, antibacterial, antifungal, anti-biofilm) may offer new therapeutic avenues for Alzheimer's disease.
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