MiR-29 coordinates age-dependent plasticity brakes in the adult visual cortex: EMBO Reports

D. Napoli, L. Lupori, R. Mazziotti, G. Sagona, S. Bagnoli, M. Samad, E.K. Sacramento, J. Kirkpartick, E. Putignano, S. Chen, E. Terzibasi Tozzini, P. Tognini, P. Baldi, J.C.F. Kwok, A. Cellerino, T. Pizzorusso

Research output: Contribution to journalArticlepeer-review

Abstract

Visual cortical circuits show profound plasticity during early life and are later stabilized by molecular “brakes” limiting excessive rewiring beyond a critical period. The mechanisms coordinating the expression of these factors during the transition from development to adulthood remain unknown. We found that miR-29a expression in the visual cortex dramatically increases with age, but it is not experience-dependent. Precocious high levels of miR-29a blocked ocular dominance plasticity and caused an early appearance of perineuronal nets. Conversely, inhibition of miR-29a in adult mice using LNA antagomirs activated ocular dominance plasticity, reduced perineuronal nets, and restored their juvenile chemical composition. Activated adult plasticity had the typical functional and proteomic signature of critical period plasticity. Transcriptomic and proteomic studies indicated that miR-29a manipulation regulates the expression of plasticity brakes in specific cortical circuits. These data indicate that miR-29a is a regulator of the plasticity brakes promoting age-dependent stabilization of visual cortical connections. © 2020 The Authors
Original languageEnglish
JournalEMBO Rep.
Volume21
Issue number11
DOIs
Publication statusPublished - 2020

Keywords

  • DNA methylation
  • microRNA
  • ocular dominance plasticity
  • perineuronal net
  • antagomir
  • microRNA 29a
  • adult
  • age
  • animal experiment
  • animal tissue
  • Article
  • chemical composition
  • controlled study
  • eye dominance
  • gene expression
  • male
  • mouse
  • nerve cell plasticity
  • nonhuman
  • priority journal
  • proteomics
  • transcriptomics
  • visual cortex

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