Inflammation in Neurological Disorders: The Thin Boundary Between Brain and Periphery

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• Neuroinflammation is increasingly recognized as a key driver in the pathogenesis of prevalent and rare neurological diseases.
• Diseases like Alzheimer's, vascular dementia, Parkinson's, and multiple sclerosis exhibit neuroinflammation linked to systemic immune dysregulation.
• The integrity of the blood-brain barrier is crucial, and its loss facilitates communication between the periphery and the brain.

Purpose of the Study:

• To review evidence supporting the systemic inflammation-neuroinflammation-neurodegeneration axis in neurological diseases.
• To explore potential causes for the downstream effects within this axis.
• To emphasize the importance of understanding peripheral-brain inflammation interactions for therapeutic development.

Main Methods:

• Literature review of published evidence.
• Analysis of the systemic inflammation-neuroinflammation-neurodegeneration axis.
• Focus on Alzheimer's disease, vascular dementia, Parkinson's disease, and multiple sclerosis.

Main Results:

• Strong evidence implicates the systemic inflammation-neuroinflammation-neurodegeneration axis in the pathogenesis of major neurological disorders.
• Metabolic factors, infections, microbiota dysbiosis, and oxidative stress are identified as contributing factors.
• The bidirectional communication between systemic inflammation and neuroinflammation plays a proactive role in neuropathology.

Conclusions:

• The interplay between systemic inflammation and neuroinflammation is a critical factor in the development of Alzheimer's disease, vascular dementia, Parkinson's disease, and multiple sclerosis.
• Further clinical and epidemiological research is needed to fully appreciate the etiopathogenic significance of this axis.
• Understanding this connection may unlock novel therapeutic strategies for these debilitating neurological conditions.