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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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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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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Cytokine-mediated STAT-dependent pathways underpinning human B-cell differentiation and function.

Stuart G Tangye1, Karrnan Pathmanandavel1, Cindy S Ma1

  • 1Garvan Institute of Medical Research, Darlinghurst, NSW 2010, Australia; St Vincent's Clinical School, UNSW Sydney, Darlinghurst, NSW 2010, Australia; CIRCA (Clinical Immunogenomics Research Consortium of Australasia), Australia.

Current Opinion in Immunology
|February 10, 2023
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Summary
This summary is machine-generated.

Understanding B cell function is crucial for fighting infections and preventing diseases like autoimmunity. Research on immune deficiencies reveals key molecular pathways for B cell control, offering targets to improve immunity or treat allergic and autoimmune conditions.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • B cells are vital for adaptive immunity, producing antibodies against pathogens and forming immunological memory.
  • Dysfunctional B cells contribute to various diseases, including autoimmunity, allergies, and malignancies.
  • Understanding B cell regulation is critical for both enhancing protective immunity and mitigating autoimmune or allergic responses.

Purpose of the Study:

  • To review recent advancements in understanding B cell function and regulation.
  • To highlight the role of cytokine signaling pathways in B cell development and memory.
  • To explore how studying inborn errors of immunity informs therapeutic strategies for immune dyscrasias.

Main Methods:

  • Analysis of individuals with inborn errors of immunity affecting cytokine signaling.
  • Detailed examination of signaling pathways involving cytokines, cytokine receptors, and STATs.
  • Review of literature on B cell subsets, humoral immunity, and immune dysregulation.

Main Results:

  • Identification of critical cytokine/cytokine receptor/STAT signaling pathways essential for human memory B cell and plasma cell generation.
  • Elucidation of molecular mechanisms underlying immune deficiency, autoimmunity, and atopy linked to B cell dysfunction.
  • Discovery of potential molecular targets for modulating humoral immunity.

Conclusions:

  • Studies of inborn errors of immunity have significantly advanced our understanding of B cell biology.
  • Targeting identified signaling molecules offers potential for enhancing vaccine responses or treating antibody-mediated diseases.
  • Further research into these pathways can lead to novel therapies for a range of immune-related conditions.