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Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
07:42

Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c

Published on: June 29, 2011

Molecular mechanisms underlying the apoptotic effect of KCNB1 K+ channel oxidation

Xilong Wu1, Berenice Hernandez-Enriquez, Michelle Banas

  • 1University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Department of Neuroscience and Cell Biology, 683 Hoes Ln. W., Piscataway, New Jersey 08854, USA.

The Journal of Biological Chemistry
|January 1, 2013
PubMed

Insights

Oxidized potassium channels (KCNB1) accumulate in aging brain cells, triggering apoptosis. Preventing channel oligomerization protects against this cell death, offering a potential therapeutic target for neurodegenerative diseases.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Potassium channels are crucial for nervous system function.
  • Oxidative stress impacts the aging brain and Alzheimer's disease.
  • KCNB1 (Kv2.1) channels are implicated in neuronal apoptosis.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which oxidized KCNB1 channels induce apoptosis.
  • To investigate the role of KCNB1 oligomerization and membrane localization in apoptosis.
  • To identify signaling pathways involved in KCNB1-mediated cell death.

Main Methods:

  • Biochemical analysis of KCNB1 channel oxidation and oligomerization.
  • Cellular studies using mammalian cell lines and a 3xTg-AD mouse model.
  • Investigation of endocytosis, lipid raft dynamics, and cholesterol effects.
  • Pharmacological and molecular inhibition of c-Src and JNK kinases.

Main Results:

  • Oxidized KCNB1 channels form disulfide-linked oligomers and accumulate in the plasma membrane due to impaired endocytosis.
  • A non-oxidizable C73A-KCNB1 mutant prevented oligomerization and was cytoprotective.
  • KCNB1 channels reside in lipid rafts; cholesterol levels influenced apoptosis.
  • Inhibition of c-Src and JNK signaling pathways blocked the pro-apoptotic effects of KCNB1 oxidation.

Conclusions:

  • Oxidized KCNB1 channel oligomerization disrupts lipid raft integrity, leading to apoptosis.
  • The c-Src/JNK signaling pathway is a key mediator of KCNB1 oxidation-induced cell death.
  • Targeting KCNB1 oxidation or downstream signaling may offer therapeutic strategies for aging-related neurological disorders.

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