Cited by 21MicroRNA in disease regulationEpilepsy research and treatmentExtracellular vesicles in disease

Brain cell-specific origin of circulating microRNA biomarkers in experimental temporal lobe epilepsy

Open access
Brindley, Elizabeth, Heiland, Mona, Mooney, Catherine, Diviney, Mairead, Mamad, Omar, Hill, Thomas D. M., Yan, Yan, Venø, Morten T. +10 more·2023·Frontiers in Molecular Neuroscience

Abstract

The diagnosis of epilepsy is complex and challenging and would benefit from the availability of molecular biomarkers, ideally measurable in a biofluid such as blood. Experimental and human epilepsy are associated with altered brain and blood levels of various microRNAs (miRNAs). Evidence is lacking, however, as to whether any of the circulating pool of miRNAs originates from the brain. To explore the link between circulating miRNAs and the pathophysiology of epilepsy, we first sequenced argonaute 2 (Ago2)-bound miRNAs in plasma samples collected from mice subject to status epilepticus induced by intraamygdala microinjection of kainic acid. This identified time-dependent changes in plasma levels of miRNAs with known neuronal and microglial-cell origins. To explore whether the circulating miRNAs had originated from the brain, we generated mice expressing FLAG-Ago2 in neurons or microglia using tamoxifen-inducible Thy1 or Cx3cr1 promoters, respectively. FLAG immunoprecipitates from the plasma of these mice after seizures contained miRNAs, including let-7i-5p and miR-19b-3p. Taken together, these studies confirm that a portion of the circulating pool of miRNAs in experimental epilepsy originates from the brain, increasing support for miRNAs as mechanistic biomarkers of epilepsy.

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Authors
Brindley, E., Heiland, M., Mooney, C., Diviney, M., Mamad, O., Hill, T. D. M., Yan, Y., Venø, M. T., Reschke, C. R., Batool, A., Langa, E., Sanz-Rodriguez, A., Heller, J. P., Morris, G., Conboy, K., Kjems, J., Brennan, G. P., & Henshall, D. C.
Affiliations
  • Royal College of Surgeons in Ireland (IE)
  • University College Dublin (IE)
  • Aarhus University (DK)
Corresponding author
  • Brennan, Gary P.
  • Henshall, David C.
Venue
Frontiers in Molecular Neuroscience
Published
2023-09-22
Volume
16
Pages
1230942-1230942
ISSN
1662-5099 (ISSN-L)
OpenAlex
W4386964088
Cited by
21
References
84
Citations by year
2026: 5 · 2025: 5 · 2024: 9 · 2023: 1
FWCI
1.96
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Molecular Neuroscience (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Dublin City University Open Access Institutional Repository (Dublin City University) (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • Research Explorer (The University of Manchester) (submittedVersion)
Funders
  • Wellcome Trust (222648/Z/21/Z)
  • Royal College of Surgeons in Ireland
  • European Commission (602130)
  • Higher Education Authority
  • Science Foundation Ireland (13/IA/1891, 16/RC/3948)
  • HORIZON EUROPE Framework Programme
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
Keywords
circulating microRNAs, plasma biomarkers, temporal lobe epilepsy, status epilepticus, kainic acid, Argonaute 2, microglia, neurons, let-7i-5p, miR-19b-3p, blood-brain barrier, epilepsy diagnosis

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