Modeling the interaction between quinolinate and the receptor for advanced glycation end products (RAGE): relevance for early neuropathological processes

PLoS One. 2015 Mar 10;10(3):e0120221. doi: 10.1371/journal.pone.0120221. eCollection 2015.

Abstract

The receptor for advanced glycation end products (RAGE) is a pattern-recognition receptor involved in neurodegenerative and inflammatory disorders. RAGE induces cellular signaling upon binding to a variety of ligands. Evidence suggests that RAGE up-regulation is involved in quinolinate (QUIN)-induced toxicity. We investigated the QUIN-induced toxic events associated with early noxious responses, which might be linked to signaling cascades leading to cell death. The extent of early cellular damage caused by this receptor in the rat striatum was characterized by image processing methods. To document the direct interaction between QUIN and RAGE, we determined the binding constant (Kb) of RAGE (VC1 domain) with QUIN through a fluorescence assay. We modeled possible binding sites of QUIN to the VC1 domain for both rat and human RAGE. QUIN was found to bind at multiple sites to the VC1 dimer, each leading to particular mechanistic scenarios for the signaling evoked by QUIN binding, some of which directly alter RAGE oligomerization. This work contributes to the understanding of the phenomenon of RAGE-QUIN recognition, leading to the modulation of RAGE function.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain / metabolism
  • Brain / pathology
  • Male
  • Molecular Docking Simulation
  • Neurodegenerative Diseases / metabolism
  • Neurodegenerative Diseases / pathology
  • Oxidative Stress
  • Protein Binding
  • Quinolinic Acid / chemistry*
  • Quinolinic Acid / physiology
  • Rats, Wistar
  • Receptor for Advanced Glycation End Products / chemistry*
  • Receptor for Advanced Glycation End Products / metabolism

Substances

  • Ager protein, rat
  • Receptor for Advanced Glycation End Products
  • Quinolinic Acid

Grants and funding

The work was supported by the following: 168692 Consejo Nacional de Ciencia y Tecnologia http://www.conacyt.gob.mx/pci/index.php/component/users/?task=user.login INS; 12412137 Secretaria de Educacion Publica http://promep.sep.gob.mx/solicitudesv3 INS; and No code Committe for Aid and Education in Neurochemistry http://neurochemistry.org/funding/committee-for-aid-and-education-in-neurochemistry-caen.html INS. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.