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Related Experiment Videos

Multiple antigen-specific processing pathways for activating naive CD8+ T cells in vivo.

C C Norbury1, M F Princiotta, I Bacik

  • 1Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|March 20, 2001
PubMed
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This study reveals that antigen presentation in vivo differs from in vitro models, highlighting determinant-specific pathways for generating antiviral T cell responses and suggesting cross-priming mechanisms.

Area of Science:

  • Immunology
  • Molecular Biology
  • Vaccine Development

Background:

  • Current understanding of viral antigen processing for MHC class I presentation relies heavily on in vitro studies using nonprofessional antigen-presenting cells (pAPCs).
  • This in vitro approach is limited as it doesn't fully replicate in vivo immune responses where pAPCs activate naive CD8(+) T cells.

Purpose of the Study:

  • To investigate the in vivo antigen processing and presentation by pAPCs, focusing on the role of the Transporter Associated with Protein Processing (TAP).
  • To understand how antigen presentation pathways in vivo differ from in vitro findings, particularly for vaccine design.

Main Methods:

  • Utilized TAP1-deficient (TAP1(-/-)) mice to assess the immunogenicity of model antigens synthesized by recombinant vaccinia viruses.
  • Compared in vitro and in vivo antigen presentation efficiencies, including TAP-dependent and independent pathways.

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Main Results:

  • Demonstrated a correlation between TAP-independent antigen presentation in vitro and naive T cell activation in vivo.
  • Provided the first in vivo evidence for proteolytic processing of antigenic peptides within the secretory pathway.
  • Observed TAP-independent in vivo presentation of a specific peptide (SIINFEKL) from ovalbumin (OVA), contrasting with its strict TAP dependence in vitro.
  • Showed that the same peptide presented within a fusion protein remained TAP-dependent in vivo.

Conclusions:

  • Established the existence of determinant-specific processing pathways crucial for generating antiviral T cell responses in vivo.
  • Identified potential protein-specific differences in antigen presentation, with cross-priming suggested as a likely underlying mechanism.