Aerobic exercise induces alternative splicing of neurexins in frontal cortex

Elisa Innocenzi, Ida Cariati, Emanuela De Domenico, Erika Tiberi, Giovanna D’arcangelo, Veronica Verdile, Maria Paola Paronetto, Virginia Tancredi, Marco Barchi, Pellegrino Rossi, Claudio Sette, Paola Grimaldi

Research output: Contribution to journalArticlepeer-review

Abstract

Aerobic exercise (AE) is known to produce beneficial effects on brain health by improving plasticity, connectivity, and cognitive functions, but the underlying molecular mechanisms are still limited. Neurexins (Nrxns) are a family of presynaptic cell adhesion molecules that are important in synapsis formation and maturation. In vertebrates, three-neurexin genes (NRXN1, NRXN2, and NRXN3) have been identified, each encoding for α and β neurexins, from two independent promoters. Moreover, each Nrxns gene (1–3) has several alternative exons and produces many splice variants that bind to a large variety of postsynaptic ligands, playing a role in trans-synaptic specification, strength, and plasticity. In this study, we investigated the impact of a continuous progressive (CP) AE program on alternative splicing (AS) of Nrxns on two brain regions: frontal cortex (FC) and hippocampus. We showed that exercise promoted Nrxns1–3 AS at splice site 4 (SS4) both in α and β isoforms, inducing a switch from exon-excluded isoforms (SS4−) to exon-included isoforms (SS4+) in FC but not in hippocampus. Additionally, we showed that the same AE program enhanced the expression level of other genes correlated with synaptic function and plasticity only in FC. Altogether, our findings demonstrated the positive effect of CP AE on FC in inducing molecular changes underlying synaptic plasticity and suggested that FC is possibly a more sensitive structure than hippocampus to show molecular changes.

Original languageEnglish
Article number48
JournalJournal of Functional Morphology and Kinesiology
Volume6
Issue number2
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Alternative splicing
  • Exercise
  • Frontal cortex
  • Hippocampus
  • Neurexins
  • Synapsis

ASJC Scopus subject areas

  • Anatomy
  • Rheumatology
  • Histology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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