Journal of Neural Transmission

, Volume 108, Issue 8, pp 985–1009

Monoamine oxidase-inhibition and MPTP-induced neurotoxicity in the non-human primate: comparison of rasagiline (TVP 1012) with selegiline

  • A. Kupsch
  • J. Sautter
  • M. E. Götz
  • W. Breithaupt
  • J. Schwarz
  • M. B. H. Youdim
  • P. Riederer
  • M. Gerlach
  • W. H. Oertel

DOI: 10.1007/s007020170018

Cite this article as:
Kupsch, A., Sautter, J., Götz, M. et al. J Neural Transm (2001) 108: 985. doi:10.1007/s007020170018

Summary.

The neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) has been shown to induce parkinsonism in man and non-human primates. Monoamine-oxidase B (MAO-B) has been reported to be implicated in both MPTP-induced parkinsonism and Parkinson's disease, since selegiline (L-deprenyl), an irreversible MAO-B inhibitor, prevents MPTP-induced neurotoxicity in numerous species including mice, goldfish and drosophyla. However, one disadvantage of this substance relates to its metabolism to (−)-methamphetamine and (−)-amphetamine. Rasagiline (R-(+)-N-propyl-1-aminoindane) is a novel irrevesible MAO-B-inhibitor, which is not metabolized to metamphetamine and/or amphetamine. The present study compared the effects of high doses of selegiline and rasagiline (10 mg/kg body weight s.c.) on MPTP-induced dopaminergic neurotoxicity in a non-human primate (Callithrix jacchus) model of PD. Groups of four monkeys were assigned to the following six experimental groups: Group I: Saline, Group II: Selegiline/Saline, Group III: Rasagiline/Saline, Group IV: MPTP/Saline, Group V: Rasagiline/MPTP, Group VI: Selegiline/MPTP. Daily treatment with MAO-B-inhibitors (either rasagiline or selegiline, 10 mg/kg body weight s.c.) was initiated four days prior to MPTP-exposure (MPTP-HCl, 2 mg/kg body weight subcutaneously, separated by an interval of 24 hours for a total of four days) and was continued until the end of the experiment, i.e. 7 days after the cessation of the MPTP-injections, when animals were sacrificed. MPTP-treatment caused distinct behavioural, histological, and biochemical alterations: 1. significant reduction of motor activity assessed by clinical rating and by computerized locomotor activity measurements; 2. substantial loss (approx. 40%) of dopaminergic (tyrosine-hydroxylase-positive) cells in the substantia nigra, pars compacta; and 3. putaminal dopamine depletion of 98% and its metabolites DOPAC (88%) and HVA (96%). Treatment with either rasagiline or selegiline markedly attenuated the neurotoxic effects of MPTP at the behavioural, histological, and at the biochemical levels. There were no significant differences between rasagiline/MPTP and selegiline/MPTP-treated animals in respect to signs of motor impairment, the number of dopaminergic cells in the substantia nigra, and striatal dopamine levels. As expected, both inhibitors decreased the metabolism of dopamine, leading to reduced levels of HVA and DOPAC (by >95% and 45% respectively). In conclusion, rasagiline and selegiline at the dosages employed equally protect against MPTP-toxicity in the common marmoset, suggesting that selegiline-derived metabolites are not important for the neuroprotective effects of high dose selegiline in the non-human MPTP-primate model in the experimental design employed. However, unexpectedly, high dose treatment with both MAO-inhibitors caused a decrease of the cell sizes of nigral tyrosine hydroxylase positive neurons. It remains to be determined, if this histological observation represents potential adverse effects of high dose treatment with monoamine oxidase inhibitors.

Keywords: Parkinson's disease, MPTP, MPP+, common marmoset, monoamine-oxidase, A and B, selegiline, TVP-1012, rasagiline.

Copyright information

© Springer-Verlag Wien 2001

Authors and Affiliations

  • A. Kupsch
    • 1
  • J. Sautter
    • 1
  • M. E. Götz
    • 3
  • W. Breithaupt
    • 3
  • J. Schwarz
    • 1
  • M. B. H. Youdim
    • 4
  • P. Riederer
    • 3
  • M. Gerlach
    • 3
  • W. H. Oertel
    • 1
  1. 1.Department of Neurology, Klinikum Großhadern, Ludwig-Maximilians-University, and Institute of Physiology, MünchenDE
  2. 2.Department of Neurology, Medizinisches Zentrum für Nervenheilkunde, Philipps-University Marburg, MarburgDE
  3. 3.Clinical Neurochemistry, Department of Psychiatry and Psychotherapy, Julius-Maximilians-University, Würzburg, Federal Republic of GermanyDE
  4. 4.Department of Pharmacology, Rappaport Family Research Institute, Eve Topf and National Parkinson Foundation Centers for Neurodegenerative Diseases, Faculty of Medicine, Technion, Haifa, IsraelIL
  5. 5.Department of Neurology, Campus Virchow, Charité, BerlinDE
  6. 6.Department of Toxicology, Julius-Maximilians-University, Würzburg, Federal Republic of GermanyDE