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Related Concept Videos

Activation of Integrins01:15

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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
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Anchoring Junctions01:03

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain,...
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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Integrin activation.

Mark H Ginsberg1

  • 1Department of Medicine, University of California, San Diego, La Jolla, California 92093, USA.

BMB Reports
|November 13, 2014
PubMed
Summary
This summary is machine-generated.

Cell adhesion relies on integrins, which act as signaling receptors. Talin mediates integrin activation, a crucial process for cell survival and fate, by transmitting signals through transmembrane domains.

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Area of Science:

  • Cell biology
  • Molecular signaling
  • Biochemistry

Background:

  • Integrin-mediated cell adhesion is vital for numerous physiological processes, including development, immune responses, hemostasis, and wound healing.
  • Integrins function as signal-transducing receptors, regulating intracellular pathways that control cell survival, proliferation, and cell fate.
  • Cells can modulate integrin affinity for ligands through integrin activation, a process of "inside-out" signal transduction.

Purpose of the Study:

  • To review the molecular mechanisms of integrin activation.
  • To elucidate the role of talin in mediating integrin activation.
  • To explain how integrin transmembrane domains (TMD) transmit "inside-out" signals.

Main Methods:

  • Review of existing literature on integrin signaling and activation.
  • Analysis of molecular mechanisms involving talin and integrin transmembrane domains.
  • Discussion of allosteric changes in transmembrane proteins.

Main Results:

  • Integrin activation is a critical "inside-out" signaling process.
  • Talin plays a key role in mediating integrin activation.
  • Integrin transmembrane domains are crucial for transmitting these signals over long distances.

Conclusions:

  • Understanding integrin activation provides insights into transmembrane protein signaling.
  • The talin-integrin interaction offers a paradigm for studying "inside-out" signal transduction.
  • Further research into integrin TMD function can reveal new therapeutic targets.