Tunnelling nanotubes between neuronal and microglial cells allow bi-directional transfer of α-Synuclein and mitochondria.
Level 5 - mechanism / opinion, no new human data
In vitro bench cell culture research
PubMed 37202391 · doi:10.1038/s41419-023-05835-8
What was done
Researchers quantitatively characterized microglial tunnelling nanotubes (TNTs) and their cytoskeletal composition using human neuronal and microglial cell cultures. They examined the formation of homotypic (microglial-microglial) and heterotypic (neuronal-microglial) TNTs and measured the bidirectional transfer of alpha-synuclein (α-Syn) aggregates and mitochondria between cells following exposure to α-Syn aggregates.
What was found
The abstract reports no numerical values or statistical parameters. The authors observed that α-Syn aggregates increased global TNT connectivity and the number of connections per cell pair. Functionally, α-Syn aggregates were transferred predominantly from neurons to microglia, whereas microglia preferentially transferred mitochondria to α-Syn-burdened neurons compared with healthy neurons.
Why it matters
The findings demonstrate a direct contact-mediated rescue mechanism between human microglia and neurons, providing a structural pathway for clearing pathological α-Syn aggregates and restoring mitochondrial support.
Limits
The study is restricted entirely to in vitro cell culture systems without in vivo validation. No exact quantitative effect sizes, cell counts, or variance estimates are reported in the abstract.
Cited by
- partial Microglial cells can transfer mitochondria to other dysfunctional microglial cells via microtubules, and a deficiency in this mitochondrial sharing mechanism is linked to familial Parkinson's disease.