Characterization of a live-attenuated retroviral vaccine demonstrates protection via immune mechanisms

Related Experiment Video

Updated: Oct 29, 2026

Simultaneous Quantification of Anti-vector and Anti-transgene-Specific CD8+ T Cells Via MHC I Tetramer Staining After Vaccination with a Viral Vector
08:10

Simultaneous Quantification of Anti-vector and Anti-transgene-Specific CD8+ T Cells Via MHC I Tetramer Staining After Vaccination with a Viral Vector

Published on: November 28, 2018

U Dittmer1, D M Brooks, K J Hasenkrug

  • 1Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, Hamilton, Montana 59840, USA. udittmer@atlas.niaid.nih.gov

Journal of Virology
|July 11, 1998
PubMed

Insights

Live-attenuated retroviral vaccines, like Friend murine leukemia helper virus (F-MuLV), require live virus for protection against disease. Immune cells, not viral interference, mediate this protection.

Area of Science:

  • Virology
  • Immunology
  • Vaccinology

Background:

  • Live-attenuated retroviruses show promise as vaccines, but their protective mechanisms remain unclear.
  • Friend virus serves as a model to investigate retroviral vaccine efficacy and protection mechanisms.

Purpose of the Study:

  • To analyze the characteristics of a live-attenuated vaccine against Friend virus-induced disease.
  • To determine the dose of attenuated F-MuLV required for complete protection.
  • To elucidate whether immune cells or viral interference mediate protection.

Main Methods:

  • Mice were immunized with a live-attenuated nonpathogenic Friend murine leukemia helper virus (F-MuLV), further attenuated by crossing the Fv-1 genetic barrier.
  • The minimum protective dose of the attenuated F-MuLV was determined.
  • Immunity was assessed by comparing protection from live versus inactivated F-MuLV.
  • Adoptive transfer of spleen cells from vaccinated mice into recipients was performed to evaluate immune cell-mediated protection.

Main Results:

  • A dose of 10(3) focus-forming units of attenuated F-MuLV was the minimum required to protect 100% of mice against pathogenic Friend virus complex challenge.
  • Live vaccine virus was essential for inducing protection; inactivated F-MuLV did not confer immunity.
  • Adoptive transfer of spleen cells from vaccinated mice into naive recipients conferred protection, indicating immune cell involvement.

Conclusions:

  • Live-attenuated retroviral vaccines, exemplified by F-MuLV, necessitate live virus for effective immunity.
  • Immune mechanisms, mediated by immune cells, are responsible for protection conferred by this live-attenuated retroviral vaccine, rather than simple viral interference.

More Related Videos

Retroviral Transduction of Helper T Cells as a Genetic Approach to Study Mechanisms Controlling their Differentiation and Function11:50

Retroviral Transduction of Helper T Cells as a Genetic Approach to Study Mechanisms Controlling their Differentiation and Function

Published on: November 4, 2016

Detection of Neutralization-sensitive Epitopes in Antigens Displayed on Virus-Like Particle (VLP)-Based Vaccines Using a Capture Assay05:15

Detection of Neutralization-sensitive Epitopes in Antigens Displayed on Virus-Like Particle (VLP)-Based Vaccines Using a Capture Assay

Published on: February 10, 2022

Related Concept Videos

Vaccines01:21

Vaccines

Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the type of...
Vaccinations01:51

Vaccinations

Overview
Immune Response Against Viral Pathogens01:29

Immune 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...
Viral Structure00:56

Viral Structure

Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
Immunological Memory01:23

Immunological Memory

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?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...
Active versus Passive Immunity01:31

Active versus Passive Immunity

Immunity, along with the ability to limit pathogen growth to prevent significant body tissue damage, can be gained either by (1) actively developing an immune response within the individual after exposure to a pathogen or after getting vaccinated or (2) passively transferring immune components from an immune individual to one who is nonimmune. Both these forms of immunity can be found naturally and in medical practices.
Active Immunity
Active immunity refers to the resistance one develops...