Dementia with lewy bodies: molecular pathogenesis and implications for classification

Area of Science:

• Neuroscience
• Neuropathology

Background:

• Dementia with Lewy bodies (DLB) is characterized by Lewy-type pathology, including Lewy bodies and Lewy neurites.
• This pathology leads to secondary cellular injury and apoptotic neurodegeneration, with dementia severity correlating to cortical Lewy body abundance.

Purpose of the Study:

• To elucidate the pathological underpinnings and clinical manifestations of Dementia with Lewy bodies.
• To explore the relationship between protein misfolding, specifically alpha-synuclein accumulation, and DLB.
• To highlight the potential for symptom-based classification to guide future therapeutic strategies.

Main Methods:

• The study reviews the pathological mechanisms of DLB, focusing on Lewy body accumulation and its consequences.
• It examines the clinical syndromes associated with DLB, including those presenting initially with dementia or Parkinson's disease.
• The role of protein misfolding and alpha-synuclein in DLB pathogenesis is discussed.

Main Results:

• DLB results from Lewy pathology, cellular injury, and neurodegeneration, with cortical Lewy body load correlating to dementia severity.
• DLB commonly co-occurs with syndromes involving dementia, visual hallucinations, parkinsonism, and cognitive impairment, often with fluctuating attention.
• Shared clinical features across DLB pathways include cognitive deficits, psychosis, depression, and REM sleep behavior disorder.

Conclusions:

• Dementia with Lewy bodies is a neurodegenerative disorder linked to alpha-synuclein protein misfolding.
• Identifying specific protein disturbances through clinical symptoms is crucial for developing targeted therapies.
• Classification systems based on symptom complexes can aid in therapeutic decision-making for protein misfolding diseases.