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Related Concept Videos

Non-gated Ion Channels01:24

Non-gated Ion Channels

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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....
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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Ion Channels01:19

Ion Channels

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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...
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Resting Potential Decay01:15

Resting Potential Decay

5.3K
The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane...
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Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
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Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
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Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes

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Lysosomal potassium channels.

Yi Wu1, Mengnan Xu2, Pingping Wang2

  • 1Collaborative Innovation Center for Biomedicine, Shanghai University of Medicine and Health Sciences, 279 Zhouzhu Rd, Shanghai 201318, China; School of Pharmacy, Shanghai University of Medicine and Health Sciences, 279 Zhouzhu Rd, Shanghai 201318, China.

Cell Calcium
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

Lysosomes regulate potassium ion (K+) homeostasis via specific channels, crucial for their function and signaling. This review explores K+ channels in lysosomes, advancing understanding of lysosomal physiology and disease.

Keywords:
BK channelLysosomeTMEM175TRPML1

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Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
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Area of Science:

  • Cell Biology
  • Organelle Physiology
  • Ion Transport Mechanisms

Background:

  • Lysosomes are key acidic organelles involved in cellular degradation and signaling.
  • Proper lysosomal function relies on strict regulation of ionic homeostasis and membrane potential.
  • Potassium ions (K+) are essential for lysosomal membrane potential and calcium (Ca2+) signaling.

Purpose of the Study:

  • To review current knowledge on lysosomal potassium (K+) homeostasis.
  • To discuss the identified lysosomal K+ channels and their roles.
  • To highlight the importance of K+ channels in lysosomal physiology and disease.

Main Methods:

  • Literature review of recent research on lysosomal K+ channels.
  • Analysis of studies investigating K+ transport and homeostasis in lysosomes.
  • Synthesis of findings on large-conductance Ca2+-activated K+ channel (BK) and TMEM175 functions.

Main Results:

  • Two primary lysosomal K+ channels, BK and TMEM175, have been identified.
  • These channels play critical roles in maintaining lysosomal membrane potential and ionic balance.
  • Limited understanding exists regarding the precise regulation and comprehensive functions of lysosomal K+.

Conclusions:

  • Further research into lysosomal K+ channels is vital for understanding lysosomal function.
  • Lysosomal K+ homeostasis is critical for cellular health and implicated in human diseases.
  • Targeting lysosomal K+ channels may offer therapeutic strategies for various conditions.