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Related Concept Videos

Viral Recombination00:57

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
Subviral Agents01:29

Subviral Agents

Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
Rabies01:28

Rabies

Rabies is a lethal zoonotic disease caused by a single-stranded, negative-sense RNA virus of the Lyssavirus genus, within the family Rhabdoviridae. Its primary mode of transmission to humans is through bites or saliva-contaminated scratches from infected mammals such as dogs, bats, raccoons, or foxes. Transmission can also occur if infectious saliva contacts abraded skin or intact mucous membranes, including the conjunctiva.Viral Entry and Early ReplicationOnce introduced at the bite or scratch...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...

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Related Experiment Video

Updated: Jul 21, 2026

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers
11:45

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers

Published on: March 8, 2012

Dangerous liaisons at the virological synapse.

Vincent Piguet1, Quentin Sattentau

  • 1Department of Dermatology and Venereology, University Hospital of Geneva, Geneva, Switzerland. vincent.piguet@medecine.unige.ch

The Journal of Clinical Investigation
|September 3, 2004
PubMed
Summary

Cell-to-cell transmission of viruses like HIV-1 and HTLV-1 occurs via virological synapses (VSs). Understanding VS formation reveals how viruses exploit immune cell interactions for spread.

Area of Science:

  • Virology
  • Immunology
  • Cell Biology

Background:

  • Retroviruses such as Human Immunodeficiency Virus type 1 (HIV-1) and Human T-cell Leukemia Virus type 1 (HTLV-1) utilize cell-to-cell transmission for propagation.
  • The precise mechanisms underlying retroviral cell-to-cell spread were not fully elucidated until the recent identification of virological synapses (VSs).

Purpose of the Study:

  • To investigate the molecular mechanisms governing the formation of virological synapses.
  • To understand how pathogens like HIV-1 and HTLV-1 subvert immune cell communication.

Main Methods:

  • The study focuses on the conceptual framework of virological synapse formation, drawing upon existing literature and research findings.
  • Analysis of molecular interactions and cellular processes involved in establishing specialized contact sites between infected and uninfected cells.

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Transsynaptic Tracing from Peripheral Targets with Pseudorabies Virus Followed by Cholera Toxin and Biotinylated Dextran Amines Double Labeling
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Transsynaptic Tracing from Peripheral Targets with Pseudorabies Virus Followed by Cholera Toxin and Biotinylated Dextran Amines Double Labeling

Published on: September 14, 2015

Production of Pseudotyped Particles to Study Highly Pathogenic Coronaviruses in a Biosafety Level 2 Setting
08:40

Production of Pseudotyped Particles to Study Highly Pathogenic Coronaviruses in a Biosafety Level 2 Setting

Published on: March 1, 2019

Related Experiment Videos

Last Updated: Jul 21, 2026

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers
11:45

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers

Published on: March 8, 2012

Transsynaptic Tracing from Peripheral Targets with Pseudorabies Virus Followed by Cholera Toxin and Biotinylated Dextran Amines Double Labeling
13:12

Transsynaptic Tracing from Peripheral Targets with Pseudorabies Virus Followed by Cholera Toxin and Biotinylated Dextran Amines Double Labeling

Published on: September 14, 2015

Production of Pseudotyped Particles to Study Highly Pathogenic Coronaviruses in a Biosafety Level 2 Setting
08:40

Production of Pseudotyped Particles to Study Highly Pathogenic Coronaviruses in a Biosafety Level 2 Setting

Published on: March 1, 2019

Main Results:

  • Virological synapses (VSs) are identified as critical specialized sites facilitating direct contact between immune cells.
  • These VSs are instrumental in directing and concentrating viral infection at the point of cell-to-cell contact.
  • The formation of VSs represents a key strategy employed by viruses to efficiently spread between cells.

Conclusions:

  • Deciphering the molecular underpinnings of VS formation offers significant insights into viral pathogenesis.
  • Understanding how viruses manipulate immune cell interactions is crucial for developing novel antiviral strategies.