Visceral adiposity, inflammation, and hippocampal function in obesity

Area of Science:

• Neuroscience
• Metabolic Disease
• Obesity Research

Background:

• Visceral adiposity, or abdominal fat, is associated with chronic diseases impacting the brain, like diabetes and hypertension.
• Distinguishing direct effects of visceral obesity from metabolic/cardiovascular factors on the brain remains challenging.
• Current understanding of adipose tissue distribution's impact on cognition is evolving.

Purpose of the Study:

• To review literature on the relationship between adipose tissue distribution and cognition in preclinical models.
• To identify knowledge gaps regarding tissue- and cell-specific insulin resistance in obesity-related cognitive effects.
• To interpret findings on neurovascular unit dysfunction in the context of central nervous system metabolic dysfunction.

Main Methods:

• Literature review of preclinical studies on adipose tissue distribution and cognition.
• Analysis of cellular changes within the neurovascular unit (endothelial cells, astrocytes, microglia, neurons).
• Interpretation of findings within the framework of progressive metabolic dysfunction in the CNS.

Main Results:

• Cells of the neurovascular unit contribute to hippocampal synaptic dysfunction in obesity.
• Signaling pathways involving cerebrovascular endothelial cells, astrocytes, microglia, and neurons are linked to memory deficits.
• Pro-inflammatory cytokines, insulin resistance, and hyperglycemia are implicated in obesity-induced hippocampal dysfunction.

Conclusions:

• Obesity-induced cognitive impairment involves complex interactions within the neurovascular unit.
• Tissue- and cell-specific insulin resistance may play a critical role in cognitive decline.
• Further research is needed to fully elucidate the mechanisms linking visceral adiposity to age-related cognitive decline.