Aranguren et al. (2026)
- Authors: Matheus Aranguren, Kim Doyon-Laliberté, Idia Boncheva, Alexandre Villard, Aléhandra Desjardins, Emma Darbinian, Suhani Patel, Charlotte DuSablon, Estefania Rivera Conde, Diana Cabrera Munoz, Ludhovik Purchase, Valerio E. C. Piscopo, Aeshah Alluli, Faiza Benaliouad, Julien Sirois, Thomas Martin Durcan, Chantal Massé, Kodjovi Dodji Mlaga, Prabha Chandrasekaran, Johanne Poudrier, Emilia Liana Falcone
- Institutes: Montreal Clinical Research Institute (IRCM), Montreal, QC, Canada, Université de Montréal, Montreal, QC, Canada, Montreal Neurological Institute-Hospital, McGill University, Montreal, QC, Canada
- Publisher: bioRxiv (Preprint)
- Link: DOI
Summary
This study identifies gut-derived vesicles as a critical missing link between an imbalanced microbiome and the neurological symptoms of Long COVID. By demonstrating that these vesicles alone can trigger brain inflammation in mice and human cell models, the research provides a potential biological target for future therapies. It shifts the focus from just the bacteria themselves to the specific inflammatory packages they release into the bloodstream.
What was researched?
The researchers investigated whether gut microbiota-derived extracellular vesicles (GMEVs) act as the primary messengers that carry signals of gut imbalance to the brain, causing neuroinflammation in Long COVID.
Why was it researched?
While Long COVID is known to involve gut dysbiosis and neurological issues, the exact mechanism of how intestinal bacteria influence the brain remained poorly understood.
How was it researched?
The team used a longitudinally characterized human cohort and transplanted Long COVID microbiota into germ-free mice. They further tested the effects of isolated GMEVs on human iPSC-derived microglia and macrophages, and administered these vesicles orally to mice to observe systemic and glial activation.
What has been found?
Long COVID-derived GMEVs were found to impair the intestinal barrier and trigger pro-inflammatory responses in both immune cells and brain-resident microglia. In mice, these vesicles remodeled the local microbiota and induced systemic inflammation alongside neuroimmune activation.
Discussion
The study suggests a vesicle-centered framework for post-viral syndromes where sustained dysbiosis translates into chronic neuroinflammation. One potential limitation is that this is a preprint and currently represents early-stage discovery that requires further peer validation.
Conclusion & Future Work
Microbiota-derived vesicles are functional mediators of the gut-brain axis in Long COVID. Targeting these vesicles or the specific dysbiosis that produces them may offer a new path for treating persistent neurological symptoms.