Disruption of Nod-like receptors alters inflammatory response to infection but does not confer protection in experimental cerebral malaria

Am J Trop Med Hyg. 2009 May;80(5):718-22.

Abstract

Research relating to host inflammatory processes during malaria infection has focused on Toll-like receptors, membrane-bound receptors implicated in innate sensing, and phagocytosis of parasitized erythrocytes by host cells. This is the first study to examine the role of Nod proteins, members of the Nod-like receptor (NLR) family of cytoplasmic proteins involved in pathogen recognition, in a murine model of cerebral malaria (Plasmodium berghei ANKA, PbA). Here, we find that nod1nod2(-/-) mice infected with PbA show no difference in survival or parasitemia compared with wild-type infected animals. However, cytokine levels, notably those associated with NLR activation including interleukin (IL)1-beta, KC, and MCP-1, and proteins linked to malaria pathogenesis, such as interferon-gamma (IFN-gamma), were decreased in the nod-1nod2(-/-) animals. We therefore demonstrate for the first time that Nod proteins are activated in response to parasites, and they play a role in regulating host inflammatory responses during malaria infection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Disease Models, Animal
  • Inflammation
  • Malaria, Cerebral / immunology*
  • Malaria, Cerebral / mortality
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Nod1 Signaling Adaptor Protein / genetics*
  • Nod1 Signaling Adaptor Protein / metabolism
  • Nod2 Signaling Adaptor Protein / genetics*
  • Nod2 Signaling Adaptor Protein / metabolism
  • Parasitemia
  • Plasmodium berghei*

Substances

  • Nod1 Signaling Adaptor Protein
  • Nod1 protein, mouse
  • Nod2 Signaling Adaptor Protein
  • Nod2 protein, mouse