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Related Concept Videos

T Cell Types and Functions01:24

T Cell Types and Functions

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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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Regulation of Hematopoietic Stem Cells01:01

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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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Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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T Cell Activation and Clonal Selection01:22

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Phenotypic and Functional Analysis of Activated Regulatory T Cells Isolated from Chronic Lymphocytic Choriomeningitis Virus-infected Mice
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HPK1 Influences Regulatory T Cell Functions.

Sansana Sawasdikosol1, Renyuan Zha2, Timothy S Fisher3

  • 1Tisch Cancer Institute, Department of Oncological Sciences, Hess Center for Science and Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029; sansana.sawasdikosol@mssm.edu.

Immunohorizons
|July 8, 2020
PubMed
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Loss of Hematopoietic progenitor kinase 1 (HPK1) in regulatory T cells (Tregs) enhances antitumor immunity by impairing Treg function. HPK1-deficient Tregs show aberrant signaling and cytokine profiles, suggesting HPK1 as an immunotherapy target.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • Hematopoietic progenitor kinase 1 (HPK1) negatively regulates T-cell receptor (TCR) signaling.
  • HPK1 deficiency enhances antitumor immunity, particularly with anti-PD-L1 therapy.
  • Regulatory T cells (Tregs) suppress anti-tumor immunity.

Purpose of the Study:

  • To investigate the role of HPK1 in Treg function.
  • To determine if HPK1 deficiency impacts Treg-mediated suppression of anti-tumor immunity.

Main Methods:

  • Comparison of Treg function in HPK1-deficient mice versus wild-type mice.
  • Analysis of TCR-induced signaling pathways (Erk MAPK, p65/RelA NF-κB) in Tregs.
  • Multiplex cytokine analysis of stimulated Tregs.

Main Results:

  • HPK1-deficient Tregs are elevated in number but exhibit impaired suppressive function.
  • HPK1-deficient Tregs show enhanced and sustained Erk MAPK and p65/RelA NF-κB phosphorylation upon TCR engagement.
  • HPK1-deficient Tregs display an aberrant cytokine profile, including increased IL-2, IFN-γ, CCL3, and CCL4 production.

Conclusions:

  • HPK1 plays a critical role in maintaining Treg suppressive function.
  • HPK1 deficiency leads to aberrant Treg signaling and cytokine production, contributing to enhanced anti-tumor immunity.
  • HPK1 represents a potential novel immunotherapeutic target for cancer treatment.