Neurodegenerative diseases: The immunological perspective.

Area of Science:

• Neuroimmunology
• Neurodegenerative Diseases

Background:

• Neurodegenerative diseases like Alzheimer's (AD), Parkinson's (PD), and Amyotrophic Lateral Sclerosis (ALS) involve complex interactions between neurons and central nervous system (CNS) immune cells, particularly microglia.
• Aging populations exhibit heightened susceptibility to these diseases, often linked to an immunological background that may exacerbate neurodegeneration.

Purpose of the Study:

• To explore the immunological mechanisms underlying neurodegeneration in AD, PD, and ALS.
• To highlight the distinct roles of microglial function and adaptive immune cells in these conditions.
• To identify potential targets for novel therapeutic and preventive strategies.

Main Methods:

• Review of current evidence on neuroinflammation in AD, PD, and ALS.
• Analysis of microglial and T cell involvement in disease pathogenesis.
• Comparison of immunological processes across different neurodegenerative diseases.

Main Results:

• Innate immune responses, triggered by misfolded proteins or neuronal debris, significantly contribute to disease progression.
• Microglial function differs across AD, PD, and ALS.
• While T cell contribution is less prominent in AD, they show neuroprotective effects in PD and ALS models by modulating microglial phenotype.

Conclusions:

• Immune dysregulation, especially involving microglia, is central to neurodegenerative disease pathogenesis.
• Adaptive immunity, particularly T cells, may offer therapeutic avenues in specific neurodegenerative conditions.
• Further research into neuroimmune interactions is crucial for developing effective treatments for AD, PD, and ALS.