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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 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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Related Experiment Video

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Isolation and Activation of Murine Lymphocytes
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Helios-Illuminating the way for lymphocyte self-control.

Iivo Hetemäki1, T Petteri Arstila1, Eliisa Kekäläinen1

  • 1Translational Immunology Research Program, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.

Immunology
|October 2, 2024
PubMed
Summary
This summary is machine-generated.

Transcription factor Helios stabilizes regulatory T cells and directs effector T cell maturation. Loss of Helios function leads to immune dysregulation, impacting adaptive immunity and potentially causing autoimmunity.

Keywords:
T cellT follicular helper cellimmunodeficiency diseasesregulatory T cellstranscription factors

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Helios, a transcription factor encoded by IKZF2, is crucial for regulatory T cell function.
  • Helios expression is not limited to regulatory T cells but is also found in effector T cells, B cells, and other lymphocyte populations.

Purpose of the Study:

  • To review the multifaceted roles of Helios in the human adaptive immune system.
  • To explore Helios' impact beyond regulatory T cell stabilization, including its role in effector T cell maturation.

Main Methods:

  • Review of existing literature on Helios function in both mouse models and human studies.
  • Analysis of data from patients with inborn errors of immunity linked to IKZF2 variants.

Main Results:

  • Helios deficiency in effector T cells results in a more inflammatory phenotype and increased susceptibility to senescence.
  • Loss of Helios disrupts germinal center reactions, leading to hypogammaglobulinemia or B cell autoimmunity.

Conclusions:

  • Helios plays a critical role in maintaining adaptive immune homeostasis.
  • Understanding Helios' functions is vital for addressing immune dysregulation and developing novel therapeutic strategies.