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Related Concept Videos

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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HIV-1 bNAb Vaccinal Effect-An Underachieving Goal?

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Broadly neutralizing monoclonal antibodies (bNAbs) show potential for a

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Area of Science:

  • Immunology
  • Virology
  • Vaccinology

Background:

  • Broadly neutralizing monoclonal antibodies (bNAbs) are being investigated for their potential to induce endogenous immune responses against HIV-1, a phenomenon termed a 'vaccinal effect'.
  • Clinical trials have reported modest increases in anti-HIV-1 neutralizing antibodies or T cell responses after bNAb administration in people living with HIV.
  • However, the mechanisms underlying this vaccinal effect remain unclear, and results are not consistently replicated.

Purpose of the Study:

  • To review clinical and pre-clinical nonhuman primate studies evaluating the vaccinal effects of HIV-1/SIV monoclonal antibodies.
  • To discuss the strengths and limitations of existing studies.
  • To outline considerations for future research, including appropriate controls and endpoints for investigating vaccinal effects.

Main Methods:

  • Review of published clinical and nonhuman primate studies on bNAbs and vaccinal effects.
  • Analysis of immune response data from these studies.
  • Discussion of challenges in measuring vaccinal effects in human trials.

Main Results:

  • Evidence for vaccinal effects from bNAb administration is inconsistent and the magnitude of immune response enhancement is generally modest.
  • Difficulties in sensitive measurement of vaccinal effects in human trials contribute to inconsistency.
  • Pre-clinical and clinical studies have limitations in demonstrating a clear and reproducible vaccinal effect.

Conclusions:

  • The elicitation of vaccinal effects by bNAbs to date has been disappointing.
  • Future studies require careful design with appropriate comparators and sensitive immunogenicity assays to conclusively interpret potential vaccinal effects.
  • Investigating immune response characteristics of elite controllers may provide relevant endpoints for durable HIV-1 suppression.