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Glycomic and Proteomic Changes in Aging Brain Nigrostriatal Pathway.

Rekha Raghunathan1, Nicole K Polinski2, Joshua A Klein3

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Age-related changes in brain glycan receptors may hinder adeno-associated virus (AAV) gene therapy for Parkinson's disease (PD). Understanding these changes is crucial for developing effective AAV vectors for PD treatment.

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Area of Science:

  • Neuroscience
  • Gene Therapy
  • Glycobiology

Background:

  • Parkinson's disease (PD) involves progressive loss of dopaminergic neurons.
  • Gene therapy using adeno-associated viruses (AAV) shows promise but faces efficacy challenges in human trials.
  • AAV binding relies on glycan receptors, which may change with age.

Purpose of the Study:

  • To investigate age-related changes in glycan receptors (heparan sulfate and N-glycans) in the rat nigrostriatal pathway.
  • To identify how these changes impact AAV binding and gene delivery for Parkinson's disease therapy.

Main Methods:

  • Analysis of striatum and substantia nigra in young versus aged rats.
  • Assessment of heparan sulfate (HS) disaccharide profiles.
  • Evaluation of N-glycan composition, focusing on terminal galactose.
  • Proteomic analysis of the nigrostriatal pathway.

Main Results:

  • Observed distinct brain region- and age-specific HS disaccharide profiles.
  • Identified age- and brain region-specific N-glycan profiles, particularly terminal galactose units.
  • Detected brain region-specific alterations in protein expression within the aging nigrostriatal pathway.

Conclusions:

  • Age-related alterations in HS and N-glycans within specific brain regions impact AAV receptor availability.
  • These glycan and proteomic changes likely contribute to reduced AAV transduction efficiency in aged individuals.
  • Findings provide critical insights for designing improved AAV vectors for Parkinson's disease gene therapy.