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The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease
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Published on: October 3, 2012

Characterization of cellular protective effects of ATP13A2/PARK9 expression and alterations resulting from pathogenic

Jason P Covy1, Elisa A Waxman, Benoit I Giasson

  • 1Department of Cellular and Molecular Physiology, Stanford University, Stanford, California, USA.

Journal of Neuroscience Research
|August 1, 2012
PubMed

Insights

Mutations in ATP13A2 cause parkinsonism by impairing cellular protection. This study reveals ATP13A2 protects against heavy metal and oxidative stress, suggesting a role in lysosomal function.

Area of Science:

  • Cell Biology
  • Neurogenetics
  • Biochemistry

Background:

  • Mutations in ATP13A2 are linked to autosomal recessive parkinsonian syndrome.
  • The precise function of ATP13A2, a lysosomal P-type ATPase, remains largely unknown.
  • Understanding ATP13A2's role is crucial for neurodegenerative disease research.

Purpose of the Study:

  • To elucidate the cellular function of ATP13A2.
  • To investigate the impact of disease-associated mutations on ATP13A2 function and stability.
  • To determine the protective mechanisms conferred by ATP13A2 expression.

Main Methods:

  • Mammalian cell culture expressing wild-type and mutant ATP13A2.
  • Assessment of cellular protection against manganese, nickel, proteasomal, mitochondrial, and oxidative stress.
  • Analysis of protein stability and degradation pathways, including endoplasmic reticulum-associated degradation (ERAD).

Main Results:

  • ATP13A2 expression confers significant protection against manganese, nickel, and various cellular stresses.
  • Disease-associated mutations (F182L, G504R) lead to protein misfolding and instability, abrogating protective functions.
  • Protective effects are not mediated by apoptosis inhibition but by reducing oxidized/damaged protein accumulation.
  • ATP13A2 is unlikely to function solely as a manganese transporter.

Conclusions:

  • ATP13A2 plays a vital role in cellular resilience against diverse toxic insults.
  • Misfolding and ERAD-mediated degradation of mutant ATP13A2 underlie its loss-of-function in parkinsonism.
  • ATP13A2 may function in cofactor import for lysosomal enzymes, contributing to neuronal health.

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