Targeted inhibition of RAGE in substantia nigra of rats blocks 6-OHDA-induced dopaminergic denervation

Sci Rep. 2017 Aug 18;7(1):8795. doi: 10.1038/s41598-017-09257-3.

Abstract

The receptor for advanced glycation endproducts (RAGE) is a pattern-recognition receptor associated with inflammation in most cell types. RAGE up-regulates the expression of proinflammatory mediators and its own expression via activation of NF-kB. Recent works have proposed a role for RAGE in Parkinson's disease (PD). In this study, we used the multimodal blocker of RAGE FPS-ZM1, which has become available recently, to selectively inhibit RAGE in the substantia nigra (SN) of rats intracranially injected with 6-hydroxydopamine (6-OHDA). FPS-ZM1 (40 μg per rat), injected concomitantly with 6-OHDA (10 μg per rat) into the SN, inhibited the increase in RAGE, activation of ERK1/2, Src and nuclear translocation of NF-kB p65 subunit in the SN. RAGE inhibition blocked glial fibrillary acidic protein and Iba-1 upregulation as well as associated astrocyte and microglia activation. Circulating cytokines in serum and CSF were also decreased by FPS-ZM1 injection. The loss of tyrosine hydroxylase and NeuN-positive neurons was significantly inhibited by RAGE blocking. Finally, FPS-ZM1 attenuated locomotory and exploratory deficits induced by 6-OHDA. Our results demonstrate that RAGE is an essential component in the neuroinflammation and dopaminergic denervation induced by 6-OHDA in the SN. Selective inhibition of RAGE may offer perspectives for therapeutic approaches.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cytokines / metabolism
  • Disease Models, Animal
  • Dopamine / metabolism*
  • Dopaminergic Neurons / drug effects*
  • Dopaminergic Neurons / metabolism*
  • Dopaminergic Neurons / pathology
  • Inflammation Mediators / metabolism
  • Male
  • NF-kappa B / metabolism
  • Oxidopamine / adverse effects*
  • Parkinson Disease / etiology
  • Parkinson Disease / metabolism
  • Parkinson Disease / pathology
  • Rats
  • Receptor for Advanced Glycation End Products / antagonists & inhibitors*
  • Substantia Nigra / drug effects
  • Substantia Nigra / metabolism*
  • Substantia Nigra / pathology
  • src-Family Kinases / metabolism

Substances

  • Cytokines
  • Inflammation Mediators
  • NF-kappa B
  • Receptor for Advanced Glycation End Products
  • Oxidopamine
  • src-Family Kinases
  • Dopamine