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Basic Science and Pathogenesis.

Maria Hovmann Andresen1, Eugenio Gutiérrez-Jiménez2, Vladimir Matchkov3

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Alzheimer's proteins, amyloid-beta oligomers and tau fibrils, impair cerebral artery function. Their combined effect suggests a synergistic role in vascular dysfunction, impacting blood flow in Alzheimer's Disease.

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Alzheimer's Disease Research

Background:

  • Alzheimer's Disease (AD) pathophysiology involves amyloid-beta (Aβ) oligomers and tau fibrils.
  • These proteins accumulate in cerebral vessels, but their impact on vascular tone and function is not fully understood.

Purpose of the Study:

  • To investigate the functional effects of Aβ oligomers and tau fibrils on cerebral arteries.
  • To determine the combined impact of these proteins on vascular dysfunction in a model relevant to AD.

Main Methods:

  • Middle cerebral arteries (MCAs) from wild-type mice were analyzed using a wire myograph.
  • MCAs were exposed to varying concentrations of Aβ oligomers (Aβ40, Aβ42) and tau fibrils.
  • Vascular contractility and relaxation responses to vasoconstrictors and acetazolamide were measured before and after protein exposure.

Main Results:

  • Aβ40 oligomers and tau fibrils significantly increased MCA baseline tension.
  • Aβ42, in combination with Aβ40 and tau, markedly attenuated vasoconstrictive responses to U-46619.
  • These findings suggest a synergistic effect on vascular dysfunction.

Conclusions:

  • Tau fibrils, similar to Aβ oligomers, induce vascular dysfunction in cerebral arteries.
  • The combined effect of Aβ and tau proteins exacerbates vascular dysfunction, modeling aspects of AD pathology.
  • Targeting vascular disturbances is crucial in AD, and these findings offer insights into mechanisms affecting cerebral blood flow.