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Deciphering the Seed Size-Dependent Cellular Internalization Mechanism for α-Synuclein Fibrils.

Arunima Sakunthala1,2, Samir K Maji1,2

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|January 6, 2025
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Summary
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Short alpha-synuclein (α-Syn) fibril seeds are taken up more readily by neurons than longer ones, potentially driving Parkinson's disease (PD) progression. This size-dependent cellular uptake mechanism influences pathological responses in PD.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Parkinson's disease (PD) pathology involves alpha-synuclein (α-Syn) aggregation and Lewy body formation, spreading in a prion-like manner.
  • The biophysical characteristics of toxic α-Syn species and early propagation events remain poorly understood.
  • Understanding α-Syn fibril seed uptake is crucial for elucidating PD pathogenesis.

Purpose of the Study:

  • To investigate the size-dependent biological activities of α-Syn fibril seeds.
  • To elucidate the mechanism of α-Syn fibril internalization and its regulation by fibril seed size.
  • To determine how fibril seed size influences cellular uptake and pathological responses in PD.

Main Methods:

  • Utilized a neuronal cell model to study α-Syn fibril seeds.
  • Employed controlled fragmentation to generate fibril seeds of varying sizes.
  • Characterized fibril seeds biophysically and analyzed their cellular uptake mechanisms.
  • Investigated size-dependent endocytic pathways, including clathrin/caveolin-mediated routes.

Main Results:

  • Increased fragmentation reduced α-Syn fibril seed size, correlating with fragmentation extent.
  • Neuronal uptake of α-Syn fibril seeds is significantly dependent on their size.
  • Shorter fibril seeds showed more prominent uptake via dynamin-dependent clathrin/caveolin-mediated endocytic pathways compared to longer seeds.
  • This size-dependent uptake may enhance the propagation of short α-Syn fibril seeds.

Conclusions:

  • The physical dimensions of α-Syn amyloid fibril seeds critically influence their cellular internalization.
  • Size-dependent endocytosis plays a key role in the differential uptake of α-Syn fibril seeds.
  • Enhanced uptake of short α-Syn fibril seeds could contribute to the prion-like spread and progression of Parkinson's disease.