2. Academic Validation
  3. Gangliosides modulate the secretion of extracellular vesicles and their misfolded protein cargo

Gangliosides modulate the secretion of extracellular vesicles and their misfolded protein cargo

  • Sci Adv. 2025 Sep 19;11(38):eady5212. doi: 10.1126/sciadv.ady5212.
John Monyror 1 2 3,  Vaibhavi Kadam 1 3,  Luis Carlos Morales 3,  Diego Ordóñez 3,  Jeremies Ibanga 1 2 3,  Asifa K Zaidi 1 2 3,  Emily McNamara 1 4,  Desmond Pink 5 6,  Magnus Stenlund 1 3,  Ken Reyes 1 2 3,  Aislinn D Maguire 1 3,  Jing Huang 3,  Leonardo M Cortez 1 7,  Valerie L Sim 1 7 8,  Sue-Ann Mok 1 4,  Elena Posse de Chaves 1 3,  Simonetta Sipione 1 2 3
Affiliations

Affiliations

  • 1 Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6G2R3, Canada.
  • 2 Glycomics Institute of Alberta, University of Alberta, Edmonton, AB T6G2R3, Canada.
  • 3 Department of Pharmacology, University of Alberta, Edmonton, AB T6G2R3, Canada.
  • 4 Deparment of Biochemistry, University of Alberta, Edmonton, AB T6G2R3, Canada.
  • 5 Department of Oncology, University of Alberta, Edmonton, AB T6G2R3, Canada.
  • 6 Nanostics Inc., Edmonton, Alberta T6N1H1, Canada.
  • 7 Centre for Prions and Protein Folding Diseases, University of Alberta, Edmonton, AB T6G2R3, Canada.
  • 8 Department of Medicine, University of Alberta, Edmonton, AB T6G2R3, Canada.
PMID: 40961208 DOI: 10.1126/sciadv.ady5212
Abstract

Gangliosides are glycosphingolipids with important roles in cell signaling and neuroprotection. While present on extracellular vesicles (EVs)-key mediators of intercellular communication-their role in EV biogenesis remains unclear. Here, we identify gangliosides as key modulators of EV biogenesis, with the specific composition of their glycan headgroup and the presence or absence of sialic acid and N-acetyl-d-galactosamine residues dictating whether they promote or inhibit EV biogenesis. GM1 and Other complex gangliosides enhance EV secretion, while disruption of ganglioside synthesis impairs it. GM1 supplementation restores EV secretion in Huntington's disease (HD) fibroblasts and cell models with ganglioside deficiency, including models of neurodegenerative diseases caused by a genetic block of ganglioside synthesis. Notably, GM1 enhances EV-mediated secretion of pathogenic misfolded proteins, including mutant Huntingtin (mHTT), α-synuclein, and tau, reducing intracellular burden and providing mechanistic insight into the mHTT-lowering effects of GM1 in HD models. Our findings shed light on the neuroprotective roles of gangliosides and their therapeutic potential in misfolded protein disorders.

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