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Related Experiment Videos

Potential live vaccines for HIV.

M S Burnett1, N Wang, M Hofmann

  • 1Department of Chemistry and Biochemistry, Institute of Molecular and Cellular Biology, The University of Texas at Austin, Austin, TX 78712, USA.

Vaccine
|December 15, 2000
PubMed
Summary
This summary is machine-generated.

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Reply by Authors.

The Journal of urology·2022

Researchers developed live vaccines targeting HIV antigens using a bacterial system. Oral administration in mice induced specific immune responses, showing promise for HIV and other pathogen vaccine development.

Area of Science:

  • Immunology
  • Vaccinology
  • Microbial Genetics

Background:

  • Developing effective vaccines against Human Immunodeficiency Virus (HIV) remains a significant global health challenge.
  • Live attenuated bacterial vectors offer a promising platform for vaccine delivery, particularly for inducing mucosal immunity.

Purpose of the Study:

  • To engineer live vaccines targeting HIV antigens using an Lpp-OmpA system.
  • To evaluate the immunogenicity of these vaccines in a murine model, focusing on mucosal IgA and T cell responses.

Main Methods:

  • An Lpp-OmpA system was employed to target HIV reverse transcriptase or its epitope to the outer membrane of attenuated Salmonella SL3261.
  • Live vaccines were administered orally to mice.
  • Fecal IgA, helper T cell proliferation, and cytotoxic CD8 T cell responses were measured.

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Main Results:

  • Oral vaccination induced fecal IgA responses specific to HIV reverse transcriptase.
  • A reverse transcriptase-specific helper T cell response was detected.
  • Epitope-targeted vaccines elicited a selective cytotoxic CD8 T cell response.

Conclusions:

  • Targeting antigens to the outer membrane of attenuated bacterial vectors is a viable strategy for vaccine development.
  • This approach shows potential for eliciting mucosal IgA and T cell responses against HIV and other pathogens.