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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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.
Naive T cells that have not yet encountered an antigen express two primary CD...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Anaphase Promoting Complex00:50

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

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T Cell Types and Functions01:24

T Cell Types and Functions

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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Regulated Protein Degradation02:58

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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The E3 ligase c-Cbl regulates dendritic cell activation.

Shin-Heng Chiou1, Payam Shahi, Ryan T Wagner

  • 1Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas 77030, USA.

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The E3 ligase c-Cbl regulates dendritic cell activation. Its deficiency enhances immune responses, increasing the potency of dendritic-cell-based cancer vaccines by boosting proinflammatory factors and nuclear factor-kappa B activity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Immune system activation requires balanced inhibitory signaling for tissue homeostasis.
  • The E3 ligase c-Cbl is known for regulating lymphocyte signaling pathways.
  • Dendritic cells play a critical role in initiating adaptive immune responses.

Purpose of the Study:

  • To investigate the role of E3 ligase c-Cbl in dendritic cell activation.
  • To determine the impact of c-Cbl deficiency on dendritic cell function and immune responses.
  • To explore the mechanisms by which c-Cbl regulates dendritic cell maturation.

Main Methods:

  • Utilized c-Cbl-deficient dendritic cells.
  • Stimulated dendritic cells with Toll-like receptors.
  • Assessed the expression of proinflammatory factors, including interleukin-12.
  • Measured nuclear factor-kappa B (NF-κB) activity.
  • Quantified p50 and p105 protein levels.

Main Results:

  • c-Cbl-deficient dendritic cells exhibit increased Toll-like receptor-induced expression of proinflammatory factors like interleukin-12.
  • Dendritic cell-based vaccines show enhanced potency against established tumors when using c-Cbl-deficient cells.
  • NF-κB activity is increased in c-Cbl-deficient dendritic cells.
  • c-Cbl deficiency leads to reduced levels of p50 and p105, key modulators of NF-κB function.
  • c-Cbl plays a RING-domain-dependent role in dendritic cell maturation.

Conclusions:

  • The E3 ligase c-Cbl is a key regulator of dendritic cell activation and maturation.
  • Loss of c-Cbl enhances dendritic cell proinflammatory responses and vaccine efficacy.
  • c-Cbl likely modulates NF-κB activity through its interaction with p50 and/or p105.