Immunogenicity of a Salmonella typhi CVD 908 candidate vaccine strain expressing the major surface protein gp63 of Leishmania mexicana mexicana

Vaccine. 1998 May-Jun;16(9-10):1043-52. doi: 10.1016/s0264-410x(97)00267-3.

Abstract

Attenuated Salmonella typhi are attractive for use as live vector vaccines to express protozoal antigens and deliver them to the human immune system. The gene encoding the mature form of Leishmania mexicana mexicana gp63 under control of tac promoter was integrated into the delta aroC locus of the chromosome of attenuated delta aroC, delta aroD S. typhi strain CVD 908. After oral immunization of BALB/c mice with two 1 x 10(9) colony forming unit doses given 21 days apart, CVD 908 omega (delta aroC::Ptac-gp63) elicited a broad T cell-mediated immune response against L. m. mexicana gp63 as demonstrated by: (1) lymphoproliferative response to fixed whole L. m. mexicana promastigotes; (2) activation of IL-2 (but not IL-4)-producing lymphocytes; (3) appearance of cytotoxic T cells against mouse mastocytoma cells expressing gp63. This T-cell mediated immune response was associated with significant protection in F1 (BALB/cXC57Bl/6) mice challenged in their footpads with a wild type strain of L. m. mexicana.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Administration, Oral
  • Animals
  • Antigens, Protozoan / genetics*
  • Base Sequence
  • Cytotoxicity, Immunologic
  • DNA Primers / genetics
  • Genes, Protozoan
  • Genetic Vectors
  • Humans
  • In Vitro Techniques
  • Interleukin-2 / biosynthesis
  • Leishmania mexicana / genetics*
  • Leishmania mexicana / immunology*
  • Leishmaniasis, Cutaneous / immunology
  • Leishmaniasis, Cutaneous / prevention & control
  • Lymphocyte Activation
  • Metalloendopeptidases / genetics*
  • Metalloendopeptidases / immunology*
  • Mice
  • Mice, Inbred BALB C
  • Mice, Inbred C57BL
  • Protozoan Proteins / genetics*
  • Protozoan Proteins / immunology*
  • Protozoan Vaccines / administration & dosage
  • Protozoan Vaccines / genetics*
  • Protozoan Vaccines / immunology*
  • Recombinant Proteins / genetics
  • Recombinant Proteins / immunology
  • Salmonella typhi / genetics*
  • Salmonella typhi / immunology*
  • T-Lymphocytes / immunology
  • Vaccines, Synthetic / administration & dosage
  • Vaccines, Synthetic / genetics*
  • Vaccines, Synthetic / immunology*

Substances

  • Antigens, Protozoan
  • DNA Primers
  • Interleukin-2
  • Protozoan Proteins
  • Protozoan Vaccines
  • Recombinant Proteins
  • Vaccines, Synthetic
  • Metalloendopeptidases
  • glycoprotein gp63, Leishmania