Related Experiment Video
Updated: May 23, 2026
08:11
Assessing the Innate Sensing of HIV-1 Infected CD4+ T Cells by Plasmacytoid Dendritic Cells Using an Ex vivo Co-culture System.
Published on: September 1, 2015
HIV-1 Vpu interference with innate cell-mediated immune mechanisms
Johan K Sandberg1, Sofia K Andersson, Susanna M Bächle
1Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden. johan.sandberg@ki.se
Current HIV Research
|April 25, 2012
Summary
The HIV-1 Vpu protein hinders innate immunity by blocking invariant natural killer T (iNKT) and natural killer (NK) cell responses. Vpu disrupts CD1d presentation and NK-T/B cell antigen (NTB-A) expression, distinct from other Vpu functions.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- The human immunodeficiency virus type 1 (HIV-1) accessory protein Vpu plays a critical role in viral pathogenesis.
- Vpu counteracts host innate immune responses, but its precise mechanisms are still being elucidated.
- Understanding Vpu's interactions with cellular immunity is crucial for developing effective antiviral strategies.
Purpose of the Study:
- To review recent findings on Vpu's role in inhibiting invariant natural killer T (iNKT) and natural killer (NK) cell-mediated immune responses.
- To elucidate the distinct mechanisms by which Vpu interferes with CD1d-restricted antigen presentation and NK cell activation ligands.
- To discuss the implications of these Vpu activities in the context of HIV-1 immunity and immunopathogenesis.
Main Methods:
- Review of recent scientific literature on HIV-1 Vpu function.
- Analysis of Vpu's interference with CD1d expression and antigen presentation pathways.
- Investigation of Vpu's impact on the expression of NK cell activation ligands, specifically NK-T and B cell antigen (NTB-A).
Main Results:
- HIV-1 Vpu actively interferes with CD1d expression and subsequent antigen presentation to iNKT cells.
- Vpu also inhibits the expression of the NK cell activation ligand NK-T and B cell antigen (NTB-A).
- These inhibitory mechanisms are mechanistically distinct from Vpu's known roles in down-modulating CD4 and Tetherin (BST-2).
Conclusions:
- HIV-1 Vpu employs distinct strategies to evade iNKT and NK cell surveillance.
- Vpu's interference with CD1d and NTB-A pathways represents novel mechanisms of viral immune evasion.
- Further research into these interactions is vital for understanding HIV-1 pathogenesis and for therapeutic target identification.
Related Concept Videos
01:29Immune Response Against Viral Pathogens
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
01:30Inhibitors of Viral Protein Synthesis
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
01:25Immunodeficiency Diseases
Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...
There are three main causes of immunodeficiency disorders...
01:40Cell-mediated Immune Responses
Overview
01:27Cytotoxic T Cells-mediated Immune Response
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
01:26Size and Structure of Viral Genomes
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...