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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.
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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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Interactions Between Signaling Pathways

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Convergence and divergence, and cross-talk between signaling pathways
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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.
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Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...

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Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
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Proteolytic pathways involved in modulation of CD20 levels.

Magdalena Winiarska1, Jacek Bil, Dominika Nowis

  • 1Department of Immunology, Centre of Biostructure Research, Medical University of Warsaw, Warsaw, Poland.

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|June 25, 2010
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Summary

Proteasome inhibition paradoxically reduces surface CD20 levels on lymphoma cells, increasing resistance to rituximab therapy. This unexpected finding suggests complex regulation of CD20 by the ubiquitin-proteasome system (UPS).

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Immunology

Background:

  • Rituximab resistance in lymphoma is linked to increased ubiquitin-proteasome system (UPS) activity.
  • CD20 is a key target antigen for rituximab therapy.
  • The UPS plays a crucial role in protein degradation and cellular regulation.

Purpose of the Study:

  • To investigate the effect of proteasome inhibition on CD20 levels in lymphoma cells.
  • To determine if targeting the UPS can overcome rituximab resistance by modulating CD20 expression.

Main Methods:

  • Incubation of tumor cells with rituximab.
  • Inhibition of the ubiquitin-proteasome system (UPS) using proteasome inhibitors.
  • Analysis of surface CD20 levels and rituximab-mediated cytotoxicity.

Main Results:

  • Rituximab treatment increased ubiquitinated CD20 levels in tumor cells.
  • Inhibition of the UPS led to a downregulation of surface CD20.
  • Reduced surface CD20 levels correlated with increased resistance to rituximab-induced cell death.

Conclusions:

  • Inhibition of the ubiquitin-proteasome system (UPS) counterintuitively downregulates surface CD20, enhancing rituximab resistance.
  • CD20 may be a substrate for proteolytic systems, but the exact mechanisms require further investigation.
  • These findings highlight the complex interplay between UPS, CD20 expression, and therapeutic response in lymphoma.