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Related Experiment Videos

SHIV virus-like particles bind and activate human dendritic cells.

Rongxin Zhang1, Min Li, Changyi Chen

  • 1Michael E DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030, USA.

Vaccine
|November 9, 2004
PubMed
Summary

Dendritic cells (DCs) efficiently interact with and internalize simian-human immunodeficiency virus virus-like particles (SHIV VLPs). This interaction enhances DC maturation and cytokine production, crucial for initiating robust immune responses in VLP-based vaccination strategies.

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Area of Science:

  • Immunology
  • Vaccinology
  • Virology

Background:

  • Mucosal immunization with SHIV VLPs induces strong immune responses against HIV Env.
  • The mechanisms underlying these enhanced immune responses require further investigation.

Purpose of the Study:

  • To investigate the interaction between SHIV VLPs and dendritic cells (DCs).
  • To elucidate the role of DCs in initiating immune responses following SHIV VLP immunization.

Main Methods:

  • Labeling SHIV VLPs with octadecyle rhodamine B (R18) for visualization.
  • Assessing VLP binding and internalization by human PBMC-derived DCs.
  • Quantifying DC maturation markers (CD40, CD80, CD83, CD54, CD86, HLA class I and II) via flow cytometry.
  • Measuring DC cytokine release (IL-12, IFN-gamma, TNF-alpha).

Related Experiment Videos

  • Evaluating the capacity of activated DCs to induce allogeneic T cell proliferation.

    • Main Results:

    • Approximately 50% of DCs bound R18-labeled SHIV VLPs.
    • SHIV VLPs were internalized by DCs at 37°C.
    • Incubation with SHIV VLPs significantly upregulated maturation markers on DCs.
    • SHIV VLPs stimulated DCs to release IL-12, IFN-gamma, and TNF-alpha.
    • Activated DCs demonstrated full functionality in inducing T cell proliferation.

    Conclusions:

    • Dendritic cells efficiently interact with and process SHIV VLPs.
    • DCs play a critical role in initiating the immune responses induced by SHIV VLPs.
    • The interaction between DCs and VLPs is important for enhancing immune responses in VLP-based vaccination.