Role of Endogenous Lipopolysaccharides in Neurological Disorders

Area of Science:

• Microbiology
• Immunology
• Neuroscience

Background:

• Gut dysbiosis disrupts immune homeostasis and intestinal barrier function, leading to systemic endotoxemia.
• Elevated intestinal permeability and pathobionts promote inflammation and oxidative stress, key factors in neurodegenerative diseases (NDDs).
• Bacterial products like lipopolysaccharide (LPS) can cross a compromised blood-brain barrier (BBB), initiating neuroinflammation.

Purpose of the Study:

• To review the role of lipopolysaccharide (LPS) in neuroinflammation.
• To explore the mechanisms linking gut dysbiosis, LPS, and neurodegeneration.
• To summarize LPS's contribution to neuronal cell death in NDDs.

Main Methods:

• Literature review of studies on LPS, gut microbiota, and neurodegenerative diseases.
• Analysis of the pathophysiological pathways involved.
• Synthesis of evidence linking systemic inflammation to neuroinflammation.

Main Results:

• LPS translocation across the BBB induces neuroinflammation, activating glial cells and damaging neurons.
• Chronic neuroinflammation results in oxidative/nitrative stress, mitochondrial dysfunction, and neuronal senescence.
• These processes contribute to cognitive and motor deficits characteristic of NDDs.

Conclusions:

• LPS plays a critical role in the pathogenesis of neurodegenerative diseases.
• Targeting gut dysbiosis and LPS translocation may offer therapeutic strategies for NDDs.
• Further research is needed to fully elucidate the LPS-neuroinflammation axis.