Neurobiological links between Alzheimer's disease and reward system dysfunction

Area of Science:

• Neuroscience
• Neurology
• Pathology

Background:

• Alzheimer's disease (AD) is a prevalent neurodegenerative disorder with unknown causes and limited treatments.
• Early AD pathology involves amyloid-β, neurofibrillary tangles, neuroinflammation, and neuronal loss.
• Reward system dysfunction is common in AD patients and models, manifesting as apathy and anhedonia.

Purpose of the Study:

• To explore the neuroanatomical, neurochemical, and molecular links between AD pathology and reward circuits.
• To propose that reward system dysfunction is a key endophenotype in AD pathogenesis.
• To identify potential therapeutic targets within reward-related circuits for AD.

Main Methods:

• Review of neuroanatomical, neurochemical, and molecular data.
• Analysis of shared pathways between AD progression and reward circuitry.
• Conceptual framework development linking AD and reward system dysfunction.

Main Results:

• Significant overlap exists between brain regions affected by AD and those involved in reward processing.
• Reward system dysfunction, including apathy and anhedonia, is a frequent characteristic of AD.
• Dysfunction of the brain's reward system may be an integral part of AD's pathological process.

Conclusions:

• Reward system dysfunction is a significant endophenotype of Alzheimer's disease.
• Understanding the interplay between AD and reward circuits can refine AD conceptualization.
• Targeting reward-related circuits offers a promising avenue for novel AD therapeutic strategies.