PreprintCited by 4Neurogenesis and neuroplasticity mechanismsExtracellular vesicles in diseaseNerve injury and regeneration

The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.

Exercise-induced plasma-derived extracellular vesicles increase adult hippocampal neurogenesis

Open access
Connolly, Meghan G., Fliflet, Alexander M., Ravi, Prithika, Rosu, Dan I., Boppart, Marni D., Rhodes, Justin S.·2025·Brain Research

Preprint — published as 10.1016/j.brainres.2025.150003

Abstract

Aerobic exercise enhances cognition in part by increasing adult hippocampal neurogenesis, angiogenesis, and astrogliogenesis. Since hippocampal atrophy is a hallmark of several neurological and psychiatric conditions—including depression, PTSD, Alzheimer’s disease, and aging—understanding the mechanisms by which exercise increases neurogenesis has broad therapeutic relevance. One potential mechanism involves extracellular vesicles (EVs), lipid bilayer-enclosed particles released by multiple tissues during exercise that transport bioactive molecular cargo to distant organs, including the brain. In this study, we tested whether plasma-derived EVs from exercising mice (ExerVs) are sufficient to promote hippocampal neurogenesis, astrogliogenesis, and vascular density in sedentary mice. EVs were isolated from the plasma of sedentary or exercising C57BL/6J mice and injected intraperitoneally into sedentary recipients twice weekly for four weeks. To evaluate reproducibility, the study was conducted across two independent cohorts using identical procedures. ExerV-treated mice showed a significant increase in BrdU-positive cells in the granule cell layer compared to both PBS- and SedV-treated controls in both cohorts. Approximately 90% of these cells co-expressed NeuN, indicating neuronal differentiation, while 6% co-expressed S100β, indicating astrocyte generation. No changes were observed in vascular density across groups. These findings provide initial evidence that systemically delivered exercise-derived EVs can enhance hippocampal neurogenesis and astrogliogenesis in sedentary mice. This proof-of-concept work supports further investigation into ExerVs as a potential therapeutic strategy for conditions associated with hippocampal atrophy. Highlights: ExerVs increase hippocampal neurogenesis and astrogliogenesis in sedentary mice ExerVs do not affect hippocampal vascular area Circulating ExerVs are sufficient to recapitulate key brain benefits of exercise

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Metadata

Authors
Connolly, M. G., Fliflet, A. M., Ravi, P., Rosu, D. I., Boppart, M. D., & Rhodes, J. S.
Affiliations
  • University of Alberta (CA)
  • University of Illinois Urbana-Champaign (US)
Corresponding author
Rhodes, Justin S.
Venue
Brain Research
Publisher
openRxiv
Published
2025-08-02
Volume
1869
Pages
150003-150003
ISSN
0006-8993 (ISSN-L)
OpenAlex
W7094948197
Cited by
4
References
1
Citations by year
2026: 4
FWCI
1.50
Type
journal article
Language
en
Open access
Locations
  • Brain Research (publishedVersion, cc-by-nc)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
Funders
NASA (NNX16AO69A)
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
Keywords
extracellular vesicles, plasma-derived vesicles, aerobic exercise, adult hippocampal neurogenesis, voluntary wheel running, systemic drug delivery, hippocampal atrophy, cognitive enhancement, neuronal differentiation, astrocyte differentiation, sedentary mice

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