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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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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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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Murine Model of CD40-activation of B cells
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Decoding the contextual duality of CD40 functions.

Syamdas Bandyopadhyay1, Dhiraj Gurjar2, Bhaskar Saha2

  • 1Department of Zoology, Burdwan Raj College, Burdwan, India.

Human Immunology
|August 18, 2023
PubMed
Summary
This summary is machine-generated.

The transmembrane receptor CD40 exhibits functional duality, initiating distinct signaling pathways from lipid raft and non-raft domains. This duality, influenced by CD40-ligand interactions and cellular conditions, dictates cellular responses.

Keywords:
CD40CD40LKinaseRaftTRAFs

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Signaling

Background:

  • Transmembrane receptors, like CD40, can elicit opposing cellular responses based on ligand interactions and cellular context.
  • The initial signaling events mediated by CD40 are crucial for determining the overall functional outcome.
  • Cellular conditions, including membrane lipid composition and pre-existing signaling states, can modulate CD40 signaling.

Purpose of the Study:

  • To investigate the functional duality of the CD40 receptor.
  • To elucidate how CD40-ligand interactions and cellular environments influence CD40-mediated signaling pathways.
  • To review the impact of CD40-CD40L interactions on CD40's functional outcomes in various physiological states.

Main Methods:

  • Utilized CD40-binding peptides to probe receptor function.
  • Employed recombinant mutated CD40-ligands to dissect interaction-specific signaling.
  • Used an agonistic antibody to activate CD40 and study downstream effects.
  • Differentiated signaling pathways originating from lipid raft and non-raft membrane domains.

Main Results:

  • Established that CD40 initiates two distinct signalosomes in lipid raft and non-raft membrane domains.
  • Demonstrated that CD40-binding peptides, mutated CD40-ligands, and agonistic antibodies reveal CD40's functional duality.
  • Confirmed the critical role of the initial CD40-CD40L interaction in shaping downstream signaling and cellular responses.
  • Highlighted that pre-existing cellular signaling conditions can modify initial CD40-induced signals.

Conclusions:

  • CD40 exhibits functional duality, generating distinct signaling pathways from different membrane microdomains.
  • The CD40-CD40L interaction is a key determinant of CD40's functional outcome, modulated by cellular context.
  • Understanding CD40's signaling duality is essential for comprehending its role in diverse physiological processes.