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Related Concept Videos

Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
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Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
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Interactions with and Membrane Permeabilization of Brain Mitochondria by Amyloid Fibrils
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Membrane protein oxidation determines neuronal degeneration.

Parvana Hajieva1, Nadhim Bayatti, Matthias Granold

  • 1Institute for Pathobiochemistry, University Medical Center of the Johannes Gutenberg University, Mainz, Germany.

Journal of Neurochemistry
|November 14, 2014
PubMed
Summary

Oxidative stress in neurodegenerative diseases targets membrane proteins. New aminoacyllipid inhibitors protect key residues, preventing neuronal death from various toxins.

Keywords:
Alzheimer's diseasemembrane proteinneurodegenerationneurotoxicityprotein oxidationredox cycling

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Oxidative stress is a key factor in neurodegenerative diseases like Alzheimer's and Parkinson's.
  • The precise mechanisms of oxidative neurotoxicity are not fully understood.
  • Intramembrane compounds show higher activity in neuronal oxidation compared to aqueous or amphiphilic ones.

Purpose of the Study:

  • To investigate the role of membrane protein oxidation in neurotoxicity.
  • To identify specific targets within membrane proteins affected by oxidative stress.
  • To develop novel inhibitors for oxidative neurotoxicity.

Main Methods:

  • Screening of peroxides and oxidation substrates for neuronal survival effects.
  • Synthesis of aminoacyllipids as competitive and site-specific membrane protein oxidation inhibitors.
  • Testing aminoacyllipids in primary neuronal cultures against various neurotoxins.

Main Results:

  • Aminoacyllipids targeting transmembrane tyrosine and tryptophan residues protected neurons from oxidative insults.
  • Protection was effective against hydroperoxides, kainic acid, glutathione-depleting drugs, and amyloidogenic peptides.
  • Inhibitors were ineffective against non-oxidative apoptosis inducers like sphingosine and Akt kinase inhibitors.
  • Evidence suggests a one-electron redox cycle involving membrane protein aromatic amino acids.

Conclusions:

  • Oxidative neurotoxicity converges on neuronal membrane proteins, regardless of the initial oxidant source.
  • Targeted protection of membrane proteins can prevent oxidative neurodegeneration.
  • This study highlights membrane proteins as critical targets in neurodegenerative disorders and oxidative stress.