Peripheral inflammation and neuroprotection: systemic pretreatment with complete Freund's adjuvant reduces 6-hydroxydopamine toxicity in a rodent model of Parkinson's disease

Neurobiol Dis. 2006 Dec;24(3):492-505. doi: 10.1016/j.nbd.2006.08.016. Epub 2006 Oct 3.


Complete Freund's adjuvant (CFA), a pro-inflammatory agent, was inoculated, subcutaneously, to Sprague-Dawley rats prior to the intrastriatal injection of 6-hydroxydopamine (6-OHDA). Animals were sacrificed 7 and 28 days following 6-OHDA injection; neuronal damage, glial activation and cytokine levels, within the nigrostriatal system, were then investigated. Nigrostriatal degeneration induced by 6-OHDA was accompanied by early microglial and astroglial activation, which preceded the onset of dopaminergic cell loss, in the SNc, without significant changes in cytokine levels. CFA pretreatment markedly reduced the SNc neuronal loss and associated microglial activation, as well as the rotational response to apomorphine. These changes were associated with moderate, transient increases in the nigrostriatal levels of glial-cell-derived neurotrophic factor (GDNF) and pro-inflammatory cytokines, including interleukin (IL)-1alpha, IL-1beta and IL-6. Our results show that prior delivery of a peripheral, pro-inflammatory stimulus induces neuroprotection, in a rodent model of Parkinson's disease, possibly through the modulation of cytokine production at the nigrostriatal level.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adjuvants, Immunologic / therapeutic use
  • Analysis of Variance
  • Animals
  • Disease Models, Animal
  • Freund's Adjuvant / immunology*
  • Freund's Adjuvant / therapeutic use
  • Male
  • Motor Activity / physiology
  • Neostriatum / drug effects
  • Neostriatum / immunology
  • Neostriatum / pathology
  • Nerve Degeneration / chemically induced
  • Nerve Degeneration / immunology*
  • Neuroglia / immunology*
  • Neuroglia / pathology
  • Neuroprotective Agents / immunology*
  • Neuroprotective Agents / therapeutic use
  • Oxidopamine
  • Parkinsonian Disorders / chemically induced
  • Parkinsonian Disorders / immunology*
  • Parkinsonian Disorders / pathology
  • Parkinsonian Disorders / prevention & control
  • Random Allocation
  • Rats
  • Rats, Sprague-Dawley
  • Substantia Nigra / immunology
  • Substantia Nigra / pathology


  • Adjuvants, Immunologic
  • Neuroprotective Agents
  • Oxidopamine
  • Freund's Adjuvant