Bone marrow mesenchymal stem cells attenuate 2,5-hexanedione-induced neuronal apoptosis through a NGF/AKT-dependent pathway

Sci Rep. 2016 Oct 5:6:34715. doi: 10.1038/srep34715.

Abstract

Growing evidence suggests that the increased neuronal apoptosis is involved in n-hexane-induced neuropathy. We have recently reported that bone marrow-mesenchymal stem cells-derived conditioned medium (BMSC-CM) attenuated 2,5-hexanedione (HD, the active metabolite of n-hexane)-induced apoptosis in PC12 cells. Here, we explored the anti-apoptotic efficacy of BMSC in vivo. HD-treated rats received BMSC by tail vein injection 5 weeks after HD intoxication. We found that in grafted rats, BMSC significantly attenuated HD-induced neuronal apoptosis in the spinal cord, which was associated with elevation of nerve growth factor (NGF). Neutralization of NGF in BMSC-CM blocked the protection against HD-induced apoptosis in VSC4.1 cells, suggesting that NGF is essential for BMSC-afforded anti-apoptosis. Mechanistically, we found that the decreased activation of Akt induced by HD was significantly recovered in the spinal cord by BMSC and in VSC4.1 cells by BMSC-CM in a TrkA-dependent manner, leading to dissociation of Bad/Bcl-xL complex in mitochondria and release of anti-apoptotic Bcl-xL. The importance of Akt was further corroborated by showing the reduced anti-apoptotic potency of BMSC in HD-intoxicated VSC4.1 cells in the presence of Akt inhibitor, MK-2206. Thus, our findings show that BMSC attenuated HD-induced neuronal apoptosis in vivo through a NGF/Akt-dependent manner, providing a novel solution against n-hexane-induced neurotoxicity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis / drug effects
  • Heterocyclic Compounds, 3-Ring / pharmacology
  • Hexanones / adverse effects*
  • Male
  • Mesenchymal Stem Cell Transplantation / methods*
  • Nerve Growth Factor / genetics
  • Nerve Growth Factor / metabolism
  • Neurotoxins / adverse effects*
  • PC12 Cells
  • Proto-Oncogene Proteins c-akt / genetics
  • Proto-Oncogene Proteins c-akt / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Signal Transduction*
  • Spinal Cord Injuries / chemically induced
  • Spinal Cord Injuries / genetics
  • Spinal Cord Injuries / metabolism
  • Spinal Cord Injuries / therapy*

Substances

  • Heterocyclic Compounds, 3-Ring
  • Hexanones
  • MK 2206
  • Neurotoxins
  • Nerve Growth Factor
  • 2,5-hexanedione
  • Proto-Oncogene Proteins c-akt