Zombosomes are anucleated cell couriers that spread α-synuclein pathology

Area of Science:

• Neuroscience
• Cell Biology
• Pathology

Background:

• Astrocytes are crucial for brain microenvironment regulation and are implicated in neurodegenerative diseases.
• Understanding intercellular communication in astrocytes is key to deciphering disease propagation mechanisms.

Purpose of the Study:

• To identify and characterize novel intercellular pathways involved in neurodegeneration.
• To investigate the role of astrocyte-derived vesicles in the spread of Parkinson's disease pathology.

Main Methods:

• Identification and characterization of astrocyte-derived vesicles, termed zombosomes.
• Analysis of zombosome protein markers, organelle content, and motility.
• In vitro and in vivo studies using cerebral organoids and human brain sections to assess zombosome function in disease propagation.

Main Results:

• A distinct type of actively migrating, anucleated cellular vehicle, zombosomes, was identified, originating from astrocytes.
• Zombosomes retain astrocytic markers (e.g., vimentin) and intact organelles, exhibiting adhesive and motile properties.
• Zombosomes were shown to transfer alpha-synuclein aggregates between cells and induce pathology in cerebral organoids, mirroring Parkinson's disease.
• Human brain samples revealed vimentin-rich zombosomes containing alpha-synuclein deposits, separate from astrocytes.

Conclusions:

• Zombosomes represent a novel mechanism for intercellular communication and disease propagation in the brain.
• These astrocyte-derived vesicles act as couriers of pathology, potentially driving the spread of Parkinson's disease.
• The findings highlight a new pathway involving "live" cellular vehicles in the context of neurodegenerative disease mechanisms.