Direct effect of Plasmodium vivax recombinant vaccine candidates AMA-1 and MSP-119 on the innate immune response

Vaccine. 2008 Feb 26;26(9):1204-13. doi: 10.1016/j.vaccine.2007.12.031. Epub 2008 Jan 14.

Abstract

The recombinant apical membrane antigen 1 (AMA-1) and 19-kDa fragment of merozoite surface protein (MSP-1(19)) are the lead candidates for inclusion in a vaccine against blood stages of malaria due to encouraging protective studies in humans and animals. Despite the importance of an efficacious malaria vaccine, vaccine-related research has focused on identifying antigens that result in protective immunity rather than determining the nature of anti-malarial immune effector mechanisms. Moreover, emphasis has been placed on adaptive rather than innate immune responses. In this study, we investigated the effect of Plasmodium vivax vaccine candidates Pv-AMA-1 and Pv-MSP-1(19) on the immune response of malaria-naïve donors. Maturation of dendritic cells is altered by Pv-AMA-1 but not Pv-MSP-1(19), as observed by differential expression of cell surface markers. In addition, Pv-AMA-1 induced an increased production of MIP-1alpha/CCL3 and decreased production of TARC/CCL17 levels in both dendritic cells (DCs) and peripheral blood mononuclear cells (PBMCs). Finally, a significant pro-inflammatory response was elicited by Pv-AMA-1-stimulated PBMCs. These results suggest that the recombinant vaccine candidate Pv-AMA-1 may play a direct role on innate immune response and might be involved in parasite destruction.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Animals
  • Antigens, Protozoan / genetics
  • Antigens, Protozoan / immunology*
  • Cytokines / metabolism
  • Dendritic Cells / cytology
  • Dendritic Cells / immunology
  • Humans
  • Immunity, Innate*
  • Leukocytes, Mononuclear / immunology
  • Lymphocyte Activation
  • Malaria Vaccines / administration & dosage
  • Malaria Vaccines / genetics
  • Malaria Vaccines / immunology*
  • Malaria, Vivax / immunology*
  • Malaria, Vivax / parasitology
  • Malaria, Vivax / prevention & control
  • Membrane Proteins / genetics
  • Membrane Proteins / immunology*
  • Merozoite Surface Protein 1 / genetics
  • Merozoite Surface Protein 1 / immunology*
  • Plasmodium vivax / immunology*
  • Protozoan Proteins / genetics
  • Protozoan Proteins / immunology*
  • Vaccines, Synthetic / administration & dosage
  • Vaccines, Synthetic / immunology*

Substances

  • Antigens, Protozoan
  • Cytokines
  • Malaria Vaccines
  • Membrane Proteins
  • Merozoite Surface Protein 1
  • Protozoan Proteins
  • Vaccines, Synthetic
  • apical membrane antigen I, Plasmodium