Cell Reports (Mar 2024)

ciRS-7 and miR-7 regulate ischemia-induced neuronal death via glutamatergic signaling

  • Flavia Scoyni,
  • Valeriia Sitnikova,
  • Luca Giudice,
  • Paula Korhonen,
  • Davide M. Trevisan,
  • Ana Hernandez de Sande,
  • Mireia Gomez-Budia,
  • Raisa Giniatullina,
  • Irene F. Ugidos,
  • Hiramani Dhungana,
  • Cristiana Pistono,
  • Nea Korvenlaita,
  • Nelli-Noora Välimäki,
  • Salla M. Kangas,
  • Anniina E. Hiltunen,
  • Emma Gribchenko,
  • Minna U. Kaikkonen-Määttä,
  • Jari Koistinaho,
  • Seppo Ylä-Herttuala,
  • Reetta Hinttala,
  • Morten T. Venø,
  • Junyi Su,
  • Markus Stoffel,
  • Anne Schaefer,
  • Nikolaus Rajewsky,
  • Jørgen Kjems,
  • Mary P. LaPierre,
  • Monika Piwecka,
  • Jukka Jolkkonen,
  • Rashid Giniatullin,
  • Thomas B. Hansen,
  • Tarja Malm

Journal volume & issue
Vol. 43, no. 3
p. 113862

Abstract

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Summary: Brain functionality relies on finely tuned regulation of gene expression by networks of non-coding RNAs (ncRNAs) such as the one composed by the circular RNA ciRS-7 (also known as CDR1as), the microRNA miR-7, and the long ncRNA Cyrano. We describe ischemia-induced alterations in the ncRNA network both in vitro and in vivo and in transgenic mice lacking ciRS-7 or miR-7. Our data show that cortical neurons downregulate ciRS-7 and Cyrano and upregulate miR-7 expression during ischemia. Mice lacking ciRS-7 exhibit reduced lesion size and motor impairment, while the absence of miR-7 alone results in increased ischemia-induced neuronal death. Moreover, miR-7 levels in pyramidal excitatory neurons regulate neurite morphology and glutamatergic signaling, suggesting a potential molecular link to the in vivo phenotype. Our data reveal the role of ciRS-7 and miR-7 in modulating ischemic stroke outcome, shedding light on the pathophysiological function of intracellular ncRNA networks in the brain.

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