9-Methyl-beta-carboline has restorative effects in an animal model of Parkinson's disease

Pharmacol Rep. 2010 Jan-Feb;62(1):35-53. doi: 10.1016/s1734-1140(10)70241-3.


In a previous study, a primary culture of midbrain cells was exposed to 9-methyl-beta-carboline for 48 h, which caused an increase in the number of tyrosine hydroxylase-positive cells. Quantitative RT-PCR revealed increased transcription of genes participating in the maturation of dopaminergic neurons. These in vitro findings prompted us to investigate the restorative actions of 9-methyl-beta-carboline in vivo. The compound was delivered for 14 days into the left cerebral ventricle of rats pretreated with the neurotoxin 1-methyl-4-phenyl-pyridinium ion (MPP+) for 28 days applying a dose which lowered dopamine by approximately 50%. Interestingly, 9-methyl-beta-carboline reversed the dopamine-lowering effect of the neurotoxin in the left striatum. Stereological counts of tyrosine hydroxylase-immunoreactive cells in the substantia nigra revealed that the neurotoxin caused a decrease in the number of those cells. However, when treated subsequently with 9-methyl-beta-carboline, the number reached normal values. In search of an explanation for the restorative activity, we analyzed the complexes that compose the respiratory chain in striatal mitochondria by 2-dimension gel electrophoresis followed by MALDI-TOF peptide mass fingerprinting.We found no changes in the overall composition of the complexes. However, the activity of complex I was increased by approximately 80% in mitochondria from rats treated with MPP+ and 9-methyl-beta-carboline compared to MPP+ and saline and to sham-operated rats, as determined by measurements of nicotinamide adenine dinucleotide dehydrogenase activity. Microarray technology and single RT-PCR revealed the induction of neurotrophins: brain-derived neurotrophic factor, conserved dopamine neurotrophic factor, cerebellin 1 precursor protein, and ciliary neurotrophic factor. Selected western blots yielded consistent results. The findings demonstrate restorative effects of 9-methyl-beta-carboline in an animal model of Parkinson's disease that improve the effectiveness of the respiratory chain and promote the transcription and expression of neurotrophin-related genes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algorithms
  • Animals
  • Antiparkinson Agents / therapeutic use*
  • Blotting, Western
  • Carbolines / therapeutic use*
  • Cells, Cultured
  • Dopamine / metabolism
  • Electron Transport / drug effects
  • Electrophoresis, Polyacrylamide Gel
  • Immunohistochemistry
  • Male
  • Mitochondria / drug effects
  • Mitochondria / metabolism
  • Neostriatum / metabolism
  • Neostriatum / pathology
  • Nerve Growth Factors / biosynthesis
  • Neurons / drug effects
  • Neurons / metabolism
  • Parkinson Disease, Secondary / drug therapy*
  • Parkinson Disease, Secondary / metabolism
  • Parkinson Disease, Secondary / pathology
  • Rats
  • Rats, Wistar
  • Reverse Transcriptase Polymerase Chain Reaction
  • Substantia Nigra / enzymology
  • Substantia Nigra / metabolism
  • Tyrosine 3-Monooxygenase / metabolism


  • 9-methyl-beta-carboline
  • Antiparkinson Agents
  • Carbolines
  • Nerve Growth Factors
  • Tyrosine 3-Monooxygenase
  • Dopamine