Journal of Molecular Neuroscience

, Volume 30, Issue 3, pp 297–310

Oxidative stress and 17-α- and 17-β-estradiol modulate neurofilaments differently

  • Keith Chiasson
  • Vicky Lahaie-Collins
  • Julie Bournival
  • Benoit Delapierre
  • Sylvie Gélinas
  • Maria-Grazia Martinoli
Original Article

DOI: 10.1385/JMN:30:3:297

Cite this article as:
Chiasson, K., Lahaie-Collins, V., Bournival, J. et al. J Mol Neurosci (2006) 30: 297. doi:10.1385/JMN:30:3:297

Abstract

Oxidative stress plays an important role in the pathogenesis of neurodegenerative diseases such as Parkinson's disease (PD). Neuronal death in the substantia nigra of PD patients is partly caused by exacerbated oxidative damage. Our previous studies demonstrated that oxidative stress can alter the structure and stability of neuro-filament (NF) proteins and that 17-α- and 17-β-estradiol are potent neuroprotective agents. The aim of this study was to investigate the cytoskeletal target of neuroprotection by estrogens in neuronal PC12 cells. We induced oxidative stress by MPP+ administration for 24 h, and 17-α- and 17-β-estradiol were used as neuroprotective drugs. We measured gene expression and protein expression of each NF subunit, NFL, NFM, and NFH, by semiquantitative RT-PCR, Western blot, and immunofluorescence. Our results demonstrate that NFL mRNA and protein levels are not modulated by MPP+ or estradiol isomers, whereas NFM gene expression, as well as protein expression, are strongly influenced by MPP+, 17-α-, and 17-β-estradiol after a 24-h treatment. Finally, mRNA levels of the most phosphorylated subunits, NFH, are not changed by MPP+ or treatment with both estradiol isomers, whereas NFH protein expression is decreased by the same treatments. These results suggest that oxidative stress affects neuronal cytoskeleton, maybe though proteolysis and/or abnormal structural changes in NFs. Then, 17-α- and 17-β-estradiol might help the neuronal cell in recovering after oxidative stress by inducing protein expression of NFM and NFH subunits.

Index Entries

NeuroprotectionMPP+estradiol isomersneurofilamentsexpression

Copyright information

© Humana Press Inc 2006

Authors and Affiliations

  • Keith Chiasson
    • 1
    • 2
  • Vicky Lahaie-Collins
    • 1
  • Julie Bournival
    • 1
  • Benoit Delapierre
    • 1
  • Sylvie Gélinas
    • 1
  • Maria-Grazia Martinoli
    • 1
    • 2
  1. 1.Department of Biochemistry and Research Group in NeuroscienceUniversité du Québec à Trois-RivièresTrois-RivièresCanada
  2. 2.Neuroscience Research CenterCentre de Recherche de l'Université LavalSte-FoyCanada