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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice
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Seeking help: B cells adapting to flu variability.

Robbert G van der Most1, François P Roman2, Bruce Innis3

  • 1GlaxoSmithKline Vaccines, Rue de l'Institut 89, 1330 Rixensart, Belgium. robbert.x.van-der-most@gsk.com.

Science Translational Medicine
|August 8, 2014
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Summary
This summary is machine-generated.

Preexisting immunity and vaccine adjuvants influence influenza vaccine effectiveness. CD4 T cell help is crucial for B cell adaptability against diverse viral strains, impacting antibody response quality.

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Area of Science:

  • Immunology
  • Vaccinology
  • Virology

Background:

  • Influenza vaccines aim to elicit protective immunity against circulating strains.
  • Antigenic drift and shift in influenza viruses necessitate updated vaccine formulations.
  • Preexisting immunological memory can influence vaccine responses.

Purpose of the Study:

  • To investigate the role of preexisting immunological memory in influenza vaccine response.
  • To explore the impact of antigenic context and adjuvantation on vaccine-induced B cell adaptability.
  • To understand the interplay between CD4 T cells, adjuvants, and B cell responses.

Main Methods:

  • Analysis of immune responses following influenza vaccination.
  • Assessment of B cell adaptability in the context of varying antigenic stimuli.
  • Evaluation of CD4 T cell help, including T follicular helper cell function.

Main Results:

  • Preexisting immunity and vaccine adjuvants modulate immune responses.
  • Cross-reactive CD4 memory cells, including T follicular helper cells, drive B cell adaptability.
  • Adequate CD4 T cell help is essential for optimal antibody responses to variant antigens.

Conclusions:

  • Influenza vaccine efficacy is influenced by interactions between host immunity, viral antigens, and vaccine components.
  • CD4 T cell-mediated help is a critical factor in achieving robust and adaptable antibody responses.
  • Understanding these interactions can inform the design of more effective influenza vaccines.