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Laura N Puentes1, Zsofia Lengyel-Zhand2, Ji Youn Lee2

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Poly (ADP-ribose) (PAR) interacts with hyperphosphorylated alpha-synuclein (pαSyn) in Parkinson

Keywords:
PARP-1Parkinson’s disease (PD)alpha-syncleinneurodegenerationpoly (ADP-ribose)

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Poly (ADP-ribose) (PAR) is a key regulator of cellular processes.
  • Alpha-synuclein (αSyn) aggregation and hyperphosphorylation (pαSyn) are central to Parkinson's disease (PD) pathogenesis.
  • Mechanisms linking PAR and αSyn neurotoxicity are not fully understood.

Purpose of the Study:

  • To investigate the role of PAR in aberrant cytoplasmic accumulation of pαSyn.
  • To characterize PAR-pαSyn interactions in PD models and patient samples.
  • To identify specific regions and forces mediating PAR-αSyn binding.

Main Methods:

  • Immunofluorescence assays to detect PAR-pαSyn co-localization.
  • In situ proximity ligation assays (PLA) for quantitative interaction measurements.
  • Bioinformatic analysis and site-directed mutagenesis to map binding sites.

Main Results:

  • PAR-pαSyn interactions were confirmed in transgenic mouse models of α-synucleinopathy and post mortem PD/PDD patient samples.
  • Evidence suggests PAR promotes aberrant cytoplasmic accumulation of pαSyn.
  • Electrostatic interactions between negatively charged PAR and N-terminal lysine residues of αSyn mediate binding.

Conclusions:

  • PAR-pαSyn interactions are a significant feature in Parkinson's disease pathology.
  • Understanding these interactions may reveal novel therapeutic targets for PD.
  • The N-terminal region of αSyn is crucial for its interaction with PAR.