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Parkinson's disease-associated iPLA2-VIA/PLA2G6 regulates neuronal functions and α-synuclein stability through

Akio Mori1, Taku Hatano1, Tsuyoshi Inoshita2

  • 1Department of Neurology, Juntendo University Graduate School of Medicine, 113-8421 Tokyo, Japan.

Proceedings of the National Academy of Sciences of the United States of America
|September 25, 2019
PubMed

Insights

Mutations in the iPLA2-VIA gene cause Parkinson's disease by disrupting brain lipid composition, leading to endoplasmic reticulum stress and dopaminergic neuron loss. Restoring lipid balance may protect against neurodegeneration and alpha-synuclein aggregation.

Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • Mutations in iPLA2-VIA/PLA2G6 gene are linked to PARK14-linked Parkinson's disease (PD) with alpha-synucleinopathy.
  • The precise mechanisms by which iPLA2-VIA mutations induce alpha-synuclein aggregation and dopaminergic (DA) neurodegeneration remain unclear.

Purpose of the Study:

  • To investigate the role of iPLA2-VIA in dopaminergic neurodegeneration and alpha-synuclein aggregation.
  • To elucidate the molecular mechanisms linking iPLA2-VIA dysfunction to Parkinson's disease pathology.

Main Methods:

  • Utilized iPLA2-VIA-deficient Drosophila models to study neurodegeneration and neurotransmission defects.
  • Performed lipidomic analysis on brain tissues to identify alterations in phospholipid acyl-chain length.
  • Investigated the impact of wild-type and mutant iPLA2-VIA, C19orf12, and linoleic acid administration on disease phenotypes.

Main Results:

  • iPLA2-VIA deficiency in Drosophila resulted in impaired neurotransmission, progressive brain cell loss, and DA neuron degeneration.
  • Loss of iPLA2-VIA led to shortened phospholipid acyl-chain lengths, causing endoplasmic reticulum (ER) stress due to membrane lipid imbalance.
  • Introduction of wild-type iPLA2-VIA or C19orf12 rescued these phenotypes, while a disease-associated mutant (A80T) did not.
  • Linoleic acid administration suppressed alpha-synuclein aggregation by correcting brain lipid composition.

Conclusions:

  • iPLA2-VIA plays a crucial role in maintaining membrane lipid homeostasis, essential for DA neuron survival.
  • Dysfunctional iPLA2-VIA leads to ER stress and neurodegeneration, contributing to Parkinson's disease pathogenesis.
  • Membrane remodeling by iPLA2-VIA is vital for neuronal health and alpha-synuclein stability in the context of PD.
Keywords:
DrosophilaER stressParkinson’s diseaselipidsα-synuclein

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