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DC-SIGN points the way to a novel mechanism for HIV-1 transmission

Majid Masso1

  • 1Bioinformatics and Computational Biology, School of Computational Sciences, George Mason University, Manassas, Virginia, USA.

Medgenmed : Medscape General Medicine
|November 7, 2003
PubMed

Insights

Dendritic cell (DC)-specific intercellular adhesion molecule 3 (ICAM-3) grabbing nonintegrin (DC-SIGN) binds T cells and HIV-1. This interaction facilitates HIV-1 transport and infection of T cells by DCs.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Dendritic cell (DC)-specific intercellular adhesion molecule 3 (ICAM-3) grabbing nonintegrin (DC-SIGN) is a C-type lectin on dendritic cells.
  • DC-SIGN mediates initial contact between DCs and T cells in lymphoid organs.
  • DC-SIGN binds HIV-1 envelope glycoprotein gp120.

Purpose of the Study:

  • To investigate the role of DC-SIGN in T cell interactions and HIV-1 pathogenesis.
  • To understand the mechanism of HIV-1 trans-infection mediated by DCs.

Main Methods:

  • The abstract does not specify methods, but implies molecular and cellular biology techniques.
  • Analysis of gene clusters and alternative splicing patterns.

Main Results:

  • DC-SIGN binds ICAM-3 on resting T cells, initiating cell-mediated immunity.
  • DC-SIGN facilitates HIV-1 transport by DCs (Trojan horse mechanism).
  • DC-SIGN binding to gp120 enhances HIV-1 infectivity and T cell trans-infection.

Conclusions:

  • DC-SIGN plays a critical role in HIV-1 infection by enabling efficient T cell trans-infection.
  • The discovery of related genes suggests complex regulatory mechanisms in DC-SIGN function and HIV-1 pathogenesis.

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