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Related Concept Videos

Immunodeficiency Diseases01:25

Immunodeficiency Diseases

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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...
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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Retroviruses02:33

Retroviruses

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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Overview of Exosomes01:36

Overview of Exosomes

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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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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...
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Immunological Memory01:23

Immunological Memory

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
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Related Experiment Video

Updated: Feb 16, 2026

Isolation of Exosomes from the Plasma of HIV-1 Positive Individuals
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Isolation of Exosomes from the Plasma of HIV-1 Positive Individuals

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HIV As Trojan Exosome: Immunological Paradox Explained?

James E K Hildreth1

  • 1Department of Internal Medicine, School of Medicine, Meharry Medical College, Nashville, TN, United States.

Frontiers in Immunology
|December 19, 2017
PubMed
Summary

Developing an effective HIV vaccine remains challenging. A new model suggests HIV particles act as "Trojan exosomes," activating T cells and increasing infection risk, offering insights for future vaccine strategies.

Keywords:
HIVHIV vaccinesantigen presentationexosomesimmune modulation

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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques
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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques

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Ex Vivo Infection of Human Lymphoid Tissue and Female Genital Mucosa with Human Immunodeficiency Virus 1 and Histoculture
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Ex Vivo Infection of Human Lymphoid Tissue and Female Genital Mucosa with Human Immunodeficiency Virus 1 and Histoculture

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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques
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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques

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Ex Vivo Infection of Human Lymphoid Tissue and Female Genital Mucosa with Human Immunodeficiency Virus 1 and Histoculture
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Ex Vivo Infection of Human Lymphoid Tissue and Female Genital Mucosa with Human Immunodeficiency Virus 1 and Histoculture

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Area of Science:

  • Immunology
  • Virology
  • Vaccinology

Background:

  • The human immunodeficiency virus (HIV) pandemic persists despite antiretroviral therapies.
  • Developing an effective HIV vaccine is crucial for pandemic control but has faced significant hurdles.
  • Previous HIV vaccine trials and simian immunodeficiency virus (SIV) studies in macaques indicated increased infection risk in vaccine recipients.

Purpose of the Study:

  • To propose a novel model explaining the paradoxical increase in HIV infection risk observed in vaccine recipients.
  • To elucidate the immunological paradox of HIV pathogenesis, specifically the preferential infection of HIV-specific T cells.
  • To explore the potential of understanding HIV's exosome biology for advancing vaccine development.

Main Methods:

  • Presentation of a theoretical model.
  • Analysis of existing vaccine trial data and SIV macaque studies.
  • Hypothesizing the role of HIV particles as

Main Results:

  • The proposed model suggests HIV particles may function as "Trojan exosomes".
  • This mechanism could explain the enhanced susceptibility of HIV-specific T cells to infection.
  • The model offers a potential explanation for the increased risk observed in vaccine recipients.

Conclusions:

  • Understanding HIV's exosome-like properties may be key to overcoming vaccine development challenges.
  • The