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Related Concept Videos

Ion Channels01:19

Ion Channels

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 specific...
Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are co-secreted in...
The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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.
Insulin: The Receptor and Signaling Pathways01:28

Insulin: The Receptor and Signaling Pathways

Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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 types of...

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Related Experiment Video

Updated: May 19, 2026

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
08:50

Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets

Published on: July 3, 2018

Determination of beta-cell function: ion channel function in beta cells.

Martina Düfer1

  • 1Institute of Pharmacy, Department of Pharmacology, Toxicology and Clinical Pharmacy, University of Tübingen, Tübingen, Germany. martina.duefer@uni-tuebingen.de

Methods in Molecular Biology (Clifton, N.J.)
|August 16, 2012
PubMed
Summary

Ion channels regulate beta-cell function by coupling glucose changes to insulin release. The patch-clamp technique analyzes these ion channels, aiding in understanding beta-cell physiology and drug development.

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Area of Science:

  • Endocrinology
  • Cell Physiology
  • Molecular Biology

Background:

  • Beta cells are crucial for glucose homeostasis, converting blood glucose fluctuations into insulin secretion.
  • Ion channels are key regulators of beta-cell electrical activity and insulin release.
  • Understanding beta-cell (patho)physiology requires analyzing ion channel function.

Purpose of the Study:

  • To introduce the principles of patch-clamp techniques for ion channel analysis in beta cells.
  • To detail experimental protocols for recording ion currents in beta cells.
  • To highlight the utility of patch-clamp in studying beta-cell function and drug effects.

Main Methods:

  • Patch-clamp technique for recording ion currents (whole-cell and single-channel).
  • Analysis of ion channel activity under various experimental conditions.
  • Integration of ion current recordings with membrane potential and exocytosis measurements.

Main Results:

  • Patch-clamp enables detailed analysis of ion channel activity in beta cells.
  • The technique allows for studying ion channels independently of cell metabolism.
  • Combined measurements provide insights into the link between electrical activity and insulin secretion.

Conclusions:

  • Ion channel analysis using patch-clamp is essential for characterizing beta-cell function and dysfunction.
  • This methodology is vital for screening drugs that modulate insulin secretion.
  • The chapter provides a practical guide to applying patch-clamp in beta-cell research.