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Related Concept Videos

Ion Channels01:19

Ion Channels

91.4K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
91.4K
Contact-dependent Signaling01:19

Contact-dependent Signaling

47.0K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
47.0K
Non-gated Ion Channels01:24

Non-gated Ion Channels

8.2K
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
8.2K
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

7.7K
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
7.7K
Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

14.3K
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
14.3K
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

5.7K
GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
5.7K

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Author Spotlight: Exploring the Role of Ion Channels in Cancer: Characterization and Potential Treatment Approaches
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Author Spotlight: Exploring the Role of Ion Channels in Cancer: Characterization and Potential Treatment Approaches

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Ion Channel Conformations Regulate Integrin-Dependent Signaling.

Andrea Becchetti1, Giulia Petroni2, Annarosa Arcangeli2

  • 1Department of Biotechnology and Biosciences, University of Milano-Bicocca, 20126 Milano, Italy.

Trends in Cell Biology
|January 13, 2019
PubMed
Summary
This summary is machine-generated.

Cell-matrix adhesion influences cell fate through ion transport, particularly involving integrin receptors and potassium (K+) channels. Targeting specific K+ channel conformations may offer new strategies for modulating cancer progression.

Keywords:
K(+) channelscancercell adhesionhERGmigrationproliferation

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Cell-matrix adhesion is crucial for cell fate determination and involves significant ion transport changes.
  • Integrin receptors and potassium (K+) channels exhibit a bidirectional interplay, forming signaling hubs that control cell behavior.

Purpose of the Study:

  • To elucidate the mechanisms by which cell-matrix adhesion, integrins, and K+ channels regulate cell proliferation, differentiation, and migration.
  • To propose a model for how these interactions influence neoplastic progression and metastasis.
  • To explore the potential of targeting specific ion channel conformations for cancer therapy.

Main Methods:

  • Investigated the physical interactions between integrin receptors and K+ channels.
  • Analyzed the impact of these interactions on K+ channel gating (open/closed states) and conformations.
  • Developed a model to explain the downstream signaling pathways regulated by specific channel conformations.

Main Results:

  • Physical interactions between integrins and K+ channels directly influence the balance of channel open and closed states.
  • Distinct K+ channel conformations activate specific downstream signaling pathways.
  • These interactions play a significant role in regulating cell proliferation and migration.

Conclusions:

  • The interplay between cell-matrix adhesion, integrins, and K+ channels is a key regulator of cell fate and cancer progression.
  • Targeting specific ion channel conformations presents a potential therapeutic strategy to modulate neoplastic progression and metastasis.