Vascular Cognitive Impairment and the Gut Microbiota.

Area of Science:

• Neuroscience
• Microbiology
• Gerontology

Background:

• Vascular cognitive impairment (VCI) is a major cause of dementia in older adults, linked to cerebrovascular diseases.
• The gut microbiota (GM) is increasingly recognized for its role in VCI pathogenesis.
• The brain-gut axis, involving neural, immune, endocrine, and metabolic pathways, mediates GM-brain interactions.

Purpose of the Study:

• To review the proposed mechanisms by which the gut microbiota influences the development and maintenance of VCI.
• To explore the role of gut microbiota dysbiosis in VCI pathogenesis and its connection to metabolic diseases.

Main Methods:

• This review synthesizes current research on the gut microbiota and VCI.
• It examines the impact of bacterial components like lipopolysaccharides and their metabolites (e.g., trimethylamine-N-oxide, short-chain fatty acids) on intestinal permeability and systemic inflammation.
• The review discusses the implications for cerebrovascular disease and endothelial dysfunction, key VCI risk factors.

Main Results:

• Gut microbiota dysbiosis can contribute to atherosclerosis, cerebrovascular disease, and endothelial dysfunction, all risk factors for VCI.
• Bacterial products can increase intestinal permeability, triggering systemic inflammation and altered signaling pathways involved in VCI.
• The GM plays a significant role in acquired metabolic diseases that impact VCI regulation.

Conclusions:

• The gut microbiota is a critical factor in VCI development and progression.
• Targeting the gut microbiota presents a potential therapeutic strategy for managing VCI and related metabolic disorders.
• Further research into the gut-brain axis mechanisms is crucial for understanding and treating VCI.