Generation of CD8+ T-cell responses by a recombinant nonpathogenic Mycobacterium smegmatis vaccine vector expressing human immunodeficiency virus type 1 Env.


Journal Article

Because the vaccine vectors currently being evaluated in human populations all have significant limitations in their immunogenicity, novel vaccine strategies are needed for the elicitation of cell-mediated immunity. The nonpathogenic, rapidly growing mycobacterium Mycobacterium smegmatis was engineered as a vector expressing full-length human immunodeficiency virus type 1 (HIV-1) HXBc2 envelope protein. Immunization of mice with recombinant M. smegmatis led to the expansion of major histocompatibility complex class I-restricted HIV-1 epitope-specific CD8(+) T cells that were cytolytic and secreted gamma interferon. Effector and memory T lymphocytes were elicited, and repeated immunization generated a stable central memory pool of virus-specific cells. Importantly, preexisting immunity to Mycobacterium bovis BCG had only a marginal effect on the immunogenicity of recombinant M. smegmatis. This mycobacterium may therefore be a useful vaccine vector.

Full Text

Duke Authors

Cited Authors

  • Cayabyab, MJ; Hovav, A-H; Hsu, T; Krivulka, GR; Lifton, MA; Gorgone, DA; Fennelly, GJ; Haynes, BF; Jacobs, WR; Letvin, NL

Published Date

  • February 2006

Published In

Volume / Issue

  • 80 / 4

Start / End Page

  • 1645 - 1652

PubMed ID

  • 16439521

Pubmed Central ID

  • 16439521

International Standard Serial Number (ISSN)

  • 0022-538X

Digital Object Identifier (DOI)

  • 10.1128/JVI.80.4.1645-1652.2006


  • eng

Conference Location

  • United States