Sir-2.1 modulates 'calorie-restriction-mediated' prevention of neurodegeneration in Caenorhabditis elegans: implications for Parkinson's disease

Biochem Biophys Res Commun. 2011 Sep 23;413(2):306-10. doi: 10.1016/j.bbrc.2011.08.092. Epub 2011 Aug 26.


The phenomenon of aging is known to modulate many disease conditions including neurodegenerative ailments like Parkinson's disease (PD) which is characterized by selective loss of dopaminergic neurons. Recent studies have reported on such effects, as calorie restriction, in modulating aging in living systems. We reason that PD, being an age-associated neurodegenerative disease might be modulated by interventions like calorie restriction. In the present study we employed the transgenic Caenorhabditis elegans model (P(dat-1)::GFP) expressing green fluorescence protein (GFP) specifically in eight dopaminergic (DA) neurons. Selective degeneration of dopaminergic neurons was induced by treatment of worms with 6-hydroxy dopamine (6-OHDA), a selective catecholaminergic neurotoxin, followed by studies on effect of calorie restriction on the neurodegeneration. Employing confocal microscopy of the dopaminergic neurons and HPLC analysis of dopamine levels in the nematodes, we found that calorie restriction has a preventive effect on dopaminergic neurodegeneration in the worm model. We further studied the role of sirtuin, sir-2.1, in modulating such an effect. Studies employing RNAi induced gene silencing of nematode sir-2.1, revealed that presence of Sir-2.1 is necessary for achieving the protective effect of calorie restriction on dopaminergic neurodegeneration. Our studies provide evidence that calorie restriction affords, an sir-2.1 mediated, protection against the dopaminergic neurodegeneration, that might have implications for neurodegenerative Parkinson's disease.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Caenorhabditis elegans / genetics
  • Caenorhabditis elegans / metabolism*
  • Caenorhabditis elegans Proteins / genetics
  • Caenorhabditis elegans Proteins / metabolism*
  • Caloric Restriction*
  • Disease Models, Animal
  • Dopamine / metabolism
  • Dopaminergic Neurons / drug effects
  • Dopaminergic Neurons / metabolism*
  • Dopaminergic Neurons / pathology
  • Oxidopamine / pharmacology
  • Parkinson Disease / diet therapy*
  • Parkinson Disease / pathology
  • Sirtuins / genetics
  • Sirtuins / metabolism*


  • Caenorhabditis elegans Proteins
  • Oxidopamine
  • SIR-2.1 protein, C elegans
  • Sirtuins
  • Dopamine