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Related Concept Videos

Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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 organs,...
Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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...
Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell.  This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...

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Related Experiment Video

Updated: Jul 17, 2026

Monitoring Leucine-Rich Repeat Containing 8 Channel (LRRC8/VRAC) Activity Using Sensitized-Emission Förster Resonance Energy Transfer (SE-FRET)
08:54

Monitoring Leucine-Rich Repeat Containing 8 Channel (LRRC8/VRAC) Activity Using Sensitized-Emission Förster Resonance Energy Transfer (SE-FRET)

Published on: August 9, 2024

Ion channels in the RPE.

Sönke Wimmers1, Mike O Karl, Olaf Strauss

  • 1Experimentelle Ophthalmologie, Klinik und Poliklinik für Augenheilkunde, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany.

Progress in Retinal and Eye Research
|January 30, 2007
PubMed
Summary

The retinal pigment epithelium (RPE) relies on ion channels for vision and health. Dysfunctional ion channels in the RPE are linked to retinal degenerative diseases, highlighting their critical role.

Area of Science:

  • Ophthalmology
  • Cell Physiology
  • Molecular Biology

Background:

  • The retinal pigment epithelium (RPE) is crucial for photoreceptor function and overall visual health.
  • Understanding RPE ion channel function is key to elucidating retinal degenerative diseases.
  • The patch-clamp technique has revolutionized the study of ion channel structure and function.

Purpose of the Study:

  • To review the identified ion channels in the RPE.
  • To describe the specific functional roles of these ion channels in RPE physiology.
  • To explore the link between RPE ion channel dysfunction and retinal degeneration.

Main Methods:

  • Literature review of studies on RPE ion channels.
  • Analysis of ion channel types (K+, Cl-, Ca2+) and their gating mechanisms (voltage-gated, ligand-gated).

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Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals
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Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals

Published on: October 1, 2014

Primary Culture of Porcine Retinal Pigment Epithelial Cells
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Primary Culture of Porcine Retinal Pigment Epithelial Cells

Published on: September 23, 2022

Related Experiment Videos

Last Updated: Jul 17, 2026

Monitoring Leucine-Rich Repeat Containing 8 Channel (LRRC8/VRAC) Activity Using Sensitized-Emission Förster Resonance Energy Transfer (SE-FRET)
08:54

Monitoring Leucine-Rich Repeat Containing 8 Channel (LRRC8/VRAC) Activity Using Sensitized-Emission Förster Resonance Energy Transfer (SE-FRET)

Published on: August 9, 2024

Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals
12:01

Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals

Published on: October 1, 2014

Primary Culture of Porcine Retinal Pigment Epithelial Cells
07:59

Primary Culture of Porcine Retinal Pigment Epithelial Cells

Published on: September 23, 2022

  • Examination of the impact of ion channel activity on RPE physiology and photoreceptor interaction.

    • Main Results:

    • The RPE expresses various voltage- and ligand-gated K+, Cl-, and Ca2+-conducting channels.
    • K+ and Cl- channels regulate transepithelial ion transport and cell volume.
    • Ca2+ channels modulate RPE secretory activity, while cation channels influence ion transport and calcium homeostasis.

    Conclusions:

    • RPE ion channel activity is fundamental to RPE physiology and photoreceptor interaction.
    • Alterations in RPE ion channel function, including mutations, are implicated in retinal degenerative diseases.
    • Enhanced understanding of RPE ion channels provides insights into both normal vision and disease pathology.