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Related Concept Videos

Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
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Aβ40 Improves Cerebrovascular Endothelial Function via NOX4-Dependent Hydrogen Peroxide Release.

Elizabeth Heller1, Lindsey McGurran1, Joseph K Brown1

  • 1Department of Pharmacology, Kirksville College of Osteopathic Medicine, A.T. Still University of Health Sciences, Kirksville, MO 63501, USA.

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Alzheimer's disease involves amyloid beta (Aβ) buildup. This study shows Aβ40 peptide benefits brain endothelial cells through a NOX4-dependent mechanism, suggesting a new therapeutic pathway for Alzheimer's disease.

Keywords:
Alzheimer’s diseaseNADPH oxidaseamyloid betaendothelial cellshydrogen peroxidenitric oxidereactive oxygen speciessuperoxide

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Alzheimer's disease (AD) is linked to amyloid beta (Aβ) accumulation, causing cognitive decline and cerebrovascular issues.
  • Reactive oxygen species (ROS), especially from NADPH oxidase 2 (NOX2), worsen vascular dysfunction and Aβ deposition in AD.
  • The specific role of the NOX4 isoform in AD pathogenesis requires further investigation.

Purpose of the Study:

  • To investigate the role of the NOX4 isoform in Alzheimer's disease pathogenesis.
  • To determine if NOX4 mediates the effects of Aβ40 on brain endothelial cells.

Main Methods:

  • Predominant expression of NOX4 was identified in bEnd.3 mouse brain endothelial cells.
  • Cells were treated with Aβ40, and hydrogen peroxide (H2O2) and nitric oxide (NO) release were measured.
  • Pharmacological inhibitors targeting NOX isoforms were used to assess NOX4 involvement in Aβ40-induced H2O2 production.

Main Results:

  • Aβ40 treatment significantly increased H2O2 and NO release, enhancing endothelial cell viability.
  • Aβ40-induced H2O2 production was reduced by pan-NOX and NOX1/4-selective inhibitors.
  • Given NOX4's exclusive expression in bEnd.3 cells, these findings confirm NOX4's role in Aβ40-stimulated H2O2 release.

Conclusions:

  • The study demonstrates that Aβ40 peptide exerts beneficial effects on bEnd.3 endothelial cells.
  • These beneficial effects are mediated through a NOX4-dependent mechanism.
  • NOX4 plays a significant role in the cellular response to Aβ40 in the context of Alzheimer's disease research.