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Microbial disruption in the gut promotes cerebral endothelial dysfunction.

April J Rustia1, James S Paterson2, Giles Best3

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Area of Science:

  • Cerebrovascular biology
  • Microbiome research
  • Endothelial function

Background:

  • Cerebrovascular disease involves cerebral vessel disorders, often linked to endothelial dysfunction.
  • The gut microbiota is a potential risk factor for cerebrovascular disease, but its direct impact on cerebral vasculature is unclear.

Purpose of the Study:

  • To investigate the effect of gut microbiota disruption on cerebral endothelial function.

Main Methods:

  • Male Sprague-Dawley rats received broad-spectrum antibiotics to disrupt gut microbiota.
  • Cerebral artery function was assessed using pressure myography.
  • Endothelial nitric oxide synthase (eNOS) activity was measured via immunoblotting.

Main Results:

  • Antibiotic treatment significantly reduced gut bacterial load and altered microbial composition.
  • Middle cerebral arteries from treated rats showed increased spontaneous tone and blunted dilations.
  • Reduced eNOS phosphorylation indicates decreased eNOS activity in cerebral arteries.

Conclusions:

  • Gut microbiota disruption leads to cerebral endothelial dysfunction, primarily through reduced eNOS activity.
  • Targeting the gut microbiota may offer a novel strategy for preventing cerebrovascular diseases like stroke and aneurysms.