Exosomal 2',3'-CNP from mesenchymal stem cells promotes hippocampus CA1 neurogenesis/neuritogenesis and contributes to rescue of cognition/learning deficiencies of damaged brain

Stem Cells Transl Med. 2020 Apr;9(4):499-517. doi: 10.1002/sctm.19-0174. Epub 2020 Jan 15.

Abstract

Mesenchymal stem cells (MSCs) have been used in clinical studies to treat neurological diseases and damage. However, implanted MSCs do not achieve their regenerative effects by differentiating into and replacing neural cells. Instead, MSC secretome components mediate the regenerative effects of MSCs. MSC-derived extracellular vesicles (EVs)/exosomes carry cargo responsible for rescuing brain damage. We previously showed that EP4 antagonist-induced MSC EVs/exosomes have enhanced regenerative potential to rescue hippocampal damage, compared with EVs/exosomes from untreated MSCs. Here we show that EP4 antagonist-induced MSC EVs/exosomes promote neurosphere formation in vitro and increase neurogenesis and neuritogenesis in damaged hippocampi; basal MSC EVs/exosomes do not contribute to these regenerative effects. 2',3'-Cyclic nucleotide 3'-phosphodiesterase (CNP) levels in EP4 antagonist-induced MSC EVs/exosomes are 20-fold higher than CNP levels in basal MSC EVs/exosomes. Decreasing elevated exosomal CNP levels in EP4 antagonist-induced MSC EVs/exosomes reduced the efficacy of these EVs/exosomes in promoting β3-tubulin polymerization and in converting toxic 2',3'-cAMP into neuroprotective adenosine. CNP-depleted EP4 antagonist-induced MSC EVs/exosomes lost the ability to promote neurogenesis and neuritogenesis in damaged hippocampi. Systemic administration of EV/exosomes from EP4 -antagonist derived MSC EVs/exosomes repaired cognition, learning, and memory deficiencies in mice caused by hippocampal damage. In contrast, CNP-depleted EP4 antagonist-induced MSC EVs/exosomes failed to repair this damage. Exosomal CNP contributes to the ability of EP4 antagonist-elicited MSC EVs/exosomes to promote neurogenesis and neuritogenesis in damaged hippocampi and recovery of cognition, memory, and learning. This experimental approach should be generally applicable to identifying the role of EV/exosomal components in eliciting a variety of biological responses.

Keywords: CNP; cognition and memory; exosome; mesenchymal stem cell; neuritogenesis; neurogenesis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2',3'-Cyclic Nucleotide 3'-Phosphodiesterase / metabolism*
  • Animals
  • Brain Injuries / pathology
  • Brain Injuries / therapy*
  • CA1 Region, Hippocampal / metabolism*
  • Cognition* / drug effects
  • Cyclic AMP / metabolism
  • Doublecortin Domain Proteins
  • Exosomes / drug effects
  • Exosomes / enzymology*
  • Humans
  • Isoindoles / pharmacology
  • Learning* / drug effects
  • Mesenchymal Stem Cells / drug effects
  • Mesenchymal Stem Cells / enzymology*
  • Mice
  • Microtubule-Associated Proteins / metabolism
  • Neural Stem Cells / drug effects
  • Neural Stem Cells / metabolism
  • Neurites / drug effects
  • Neurites / metabolism*
  • Neurogenesis* / drug effects
  • Neuropeptides / metabolism
  • Polymerization
  • Receptors, Prostaglandin E, EP4 Subtype / antagonists & inhibitors
  • Receptors, Prostaglandin E, EP4 Subtype / metabolism
  • Spheroids, Cellular / drug effects
  • Spheroids, Cellular / metabolism
  • Sulfonamides / pharmacology
  • Tubulin / metabolism

Substances

  • Doublecortin Domain Proteins
  • Isoindoles
  • Microtubule-Associated Proteins
  • N-(2-(4-(4,9-diethoxy-1-oxo-1,3-dihydro-2H-benzo(f)isoindol-2-yl)phenyl)acetyl)benzene sulphonamide
  • Neuropeptides
  • Receptors, Prostaglandin E, EP4 Subtype
  • Sulfonamides
  • Tubulin
  • Cyclic AMP
  • 2',3'-Cyclic Nucleotide 3'-Phosphodiesterase