Aplp1 interacts with Lag3 to facilitate transmission of pathologic α-synuclein

Nat Commun. 2024 May 31;15(1):4663. doi: 10.1038/s41467-024-49016-3.

Abstract

Pathologic α-synuclein (α-syn) spreads from cell-to-cell, in part, through binding to the lymphocyte-activation gene 3 (Lag3). Here we report that amyloid β precursor-like protein 1 (Aplp1) interacts with Lag3 that facilitates the binding, internalization, transmission, and toxicity of pathologic α-syn. Deletion of both Aplp1 and Lag3 eliminates the loss of dopaminergic neurons and the accompanying behavioral deficits induced by α-syn preformed fibrils (PFF). Anti-Lag3 prevents the internalization of α-syn PFF by disrupting the interaction of Aplp1 and Lag3, and blocks the neurodegeneration induced by α-syn PFF in vivo. The identification of Aplp1 and the interplay with Lag3 for α-syn PFF induced pathology deepens our insight about molecular mechanisms of cell-to-cell transmission of pathologic α-syn and provides additional targets for therapeutic strategies aimed at preventing neurodegeneration in Parkinson's disease and related α-synucleinopathies.

MeSH terms

  • Amyloid beta-Protein Precursor / genetics
  • Amyloid beta-Protein Precursor / metabolism
  • Animals
  • Antigens, CD / genetics
  • Antigens, CD / metabolism
  • Dopaminergic Neurons / metabolism
  • Dopaminergic Neurons / pathology
  • Female
  • Humans
  • Lymphocyte Activation Gene 3 Protein*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Parkinson Disease / genetics
  • Parkinson Disease / metabolism
  • Parkinson Disease / pathology
  • Protein Binding
  • alpha-Synuclein* / genetics
  • alpha-Synuclein* / metabolism

Substances

  • alpha-Synuclein
  • Amyloid beta-Protein Precursor
  • Antigens, CD
  • Lag3 protein, human
  • Lymphocyte Activation Gene 3 Protein
  • APLP1 protein, human

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