Alzheimer's disease and multiple sclerosis: a possible connection through the viral demyelinating neurodegenerative...

Area of Science:

• Neuroscience and Immunology
• Infectious Diseases and Neurodegeneration

Background:

• Alzheimer's disease (AD) and multiple sclerosis (MS) are prevalent CNS disorders lacking cures.
• Current therapeutic approaches targeting amyloid or immune pathways have shown limited success, highlighting gaps in understanding disease etiology.
• Growing evidence suggests infectious agents, particularly viruses, may play a role in neurodegenerative and demyelinating diseases.

Purpose of the Study:

• To propose a unifying model, the viral DEmyelinating Neurodegenerative Trigger (vDENT), linking MS and AD through a common viral etiology and demyelination.
• To explore how early-life viral infections could initiate a cascade leading to both MS and AD later in life.

Main Methods:

• Conceptual model development (vDENT) based on existing evidence of viral infections, demyelination, and neurodegeneration.
• Integration of known pathological mechanisms in MS (demyelination, inflammation) and AD (amyloid accumulation, neurodegeneration).
• Hypothesizing the progression from initial demyelination to later-life AD dementia.

Main Results:

• The vDENT model posits that initial demyelinating viral infections (e.g., HSV-1) trigger early-life demyelination.
• Subsequent viral reactivations and inflammatory responses contribute to relapsing-remitting MS (RRMS).
• Accumulated damage and viral progression, combined with age-related factors, promote amyloid dysfunction and AD dementia.

Conclusions:

• Viral infections and subsequent demyelination may represent a shared pathway in the pathogenesis of both MS and AD.
• Interventions targeting early-life viral events could potentially prevent or delay the onset of both MS and AD.
• This model offers a new perspective for developing dual-benefit therapeutic strategies for these debilitating CNS disorders.