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Related Concept Videos

Membrane Domains01:18

Membrane Domains

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Antigen Presenting Cells01:22

Antigen Presenting Cells

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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
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Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Antigen Processing Pathways01:31

Antigen Processing Pathways

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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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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

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Microdomains in the membrane landscape shape antigen-presenting cell function.

Malou Zuidscherwoude1, Charlotte M de Winde, Alessandra Cambi

  • 11.Nijmegen Centre for Molecular Life Sciences/278 TIL, Radboud University Medical Centre, Geert Grooteplein 28, 6525GA, Nijmegen, The Netherlands. a.vanspriel@ncmls.ru.nl.

Journal of Leukocyte Biology
|October 31, 2013
PubMed
Summary
This summary is machine-generated.

Immune cell plasma membranes organize signaling through specialized microdomains. These structures are crucial for immune cell activation and offer potential therapeutic targets for diseases.

Keywords:
B cell antigen receptormajor histocompatibility complex class IIpattern recognition receptorsignal transductiontetraspanin

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Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy
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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • The plasma membrane of immune cells is critical for immune responses.
  • Immunoreceptors exhibit nonrandom spatial distribution for signaling.
  • Specialized membrane microdomains like lipid rafts and tetraspanin-enriched microdomains (TEMs) compartmentalize signaling molecules.

Purpose of the Study:

  • To review the role of membrane microdomains in immune cell function.
  • To discuss advances in visualizing plasma membrane structures.
  • To explore therapeutic strategies targeting microdomains.

Main Methods:

  • Literature review of studies on immune cell plasma membranes.
  • Analysis of research on lipid rafts and TEMs in antigen-presenting cells (APCs) and B cells.
  • Examination of microscopy advancements for membrane visualization.

Main Results:

  • Membrane microdomains are essential for pathogen recognition, immunological synapse formation, and T cell activation in APCs.
  • Tetraspanin microdomains and lipid rafts are implicated in B cell receptor (BCR) signaling and B cell activation.
  • Microdomains are increasingly recognized as key regulators of immune cell signaling.

Conclusions:

  • Understanding membrane microdomain formation is fundamental to immune cell signaling and APC function.
  • Advances in microscopy enable better visualization of these dynamic structures.
  • Targeting microdomains presents a promising therapeutic avenue for infectious and malignant diseases.