Synthetic glycovaccine protects against the bite of leishmania-infected sand flies

J Infect Dis. 2006 Aug 15;194(4):512-8. doi: 10.1086/505584. Epub 2006 Jul 3.

Abstract

Leishmaniasis is a vectorborne disease transmitted to human and other mammalian hosts by sand fly bite. In the present study, we show that immunization with Leishmania mexicana promastigote secretory gel (PSG) or with a chemically defined synthetic glycovaccine containing the glycans found in L. mexicana PSG can provide significant protection against challenge by the bite of infected sand flies. Only the glycan from L. mexicana was protective; those from other species did not protect against L. mexicana infection. Furthermore, neither PSG nor the glycovaccine protected against artificial needle challenge, which is traditionally used in antileishmanial vaccine development. Conversely, an antigen preparation that was effective against needle challenge offered no protection against sand fly bite. These findings provide a new target for Leishmania vaccine development and demonstrate the critical role that the vector plays in the evaluation of candidate vaccines for leishmaniasis and other vectorborne diseases.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Female
  • Glycosylphosphatidylinositols / administration & dosage
  • Glycosylphosphatidylinositols / therapeutic use*
  • Immunization
  • Injections, Subcutaneous
  • Insect Bites and Stings / prevention & control
  • Insect Vectors / parasitology
  • Leishmania mexicana / metabolism*
  • Leishmaniasis, Cutaneous / prevention & control*
  • Leishmaniasis, Cutaneous / transmission
  • Mice
  • Mice, Inbred BALB C
  • Protozoan Proteins / administration & dosage
  • Protozoan Proteins / therapeutic use*
  • Protozoan Vaccines / administration & dosage
  • Protozoan Vaccines / therapeutic use*
  • Psychodidae / parasitology
  • Salivary Glands / metabolism

Substances

  • Glycosylphosphatidylinositols
  • Protozoan Proteins
  • Protozoan Vaccines