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Related Concept Videos

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...
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...
Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
Activation of Integrins01:15

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...

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Updated: Jun 15, 2026

Studying Organelle Dynamics in B Cells During Immune Synapse Formation
15:39

Studying Organelle Dynamics in B Cells During Immune Synapse Formation

Published on: June 1, 2019

Early events in B cell activation.

Naomi E Harwood1, Facundo D Batista

  • 1Cancer Research UK London Research Institute, United Kingdom.

Annual Review of Immunology
|March 3, 2010
PubMed
Summary
This summary is machine-generated.

The B cell receptor (BCR) initiates immune responses by binding antigens, leading to antibody production. The cytoskeleton plays a crucial role in regulating these early B cell activation events.

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Last Updated: Jun 15, 2026

Studying Organelle Dynamics in B Cells During Immune Synapse Formation
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Published on: June 1, 2019

Imaging Initial Ca2+ Microdomains in Primary T Cells
05:56

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Published on: October 4, 2024

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
07:48

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist

Published on: April 25, 2018

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • B cell activation is critical for adaptive immunity, involving B cell receptor (BCR) signaling.
  • Early molecular events of BCR activation include antigen binding, microcluster formation, and signaling dynamics.
  • Membrane molecule reorganization during B cell activation suggests a role for the cytoskeleton.

Purpose of the Study:

  • To review recent literature on the spatiotemporal dynamics of early B cell activation.
  • To highlight the emerging role of the cytoskeleton in regulating BCR signaling and B cell activation.

Main Methods:

  • Literature review of studies investigating early B cell activation.
  • Analysis of spatiotemporal dynamics of BCR triggering and microcluster formation.
  • Examination of the cytoskeleton's involvement in BCR signaling regulation.

Main Results:

  • BCR ligation initiates a cascade of molecular events crucial for immune response.
  • BCR microcluster formation and dynamic signaling regulation are key early steps.
  • The cytoskeleton is increasingly recognized for its pivotal role in B cell activation.

Conclusions:

  • The cytoskeleton is essential for the initiation and regulation of B cell activation.
  • Understanding cytoskeleton dynamics provides insights into B cell immune responses.
  • Further research into cytoskeleton-BCR interactions can inform therapeutic strategies.