Cftr Channel Activity
Cftr Channel Activity - Related Videos
09:59
Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
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Cited by 8 •
2015
Described here is a rapid and effective procedure for functional reconstitution of purified wild-type and mutant CFTR protein that preserves activity for this chloride channel, which is defective in Cystic Fibrosis. Iodide efflux from reconstituted proteoliposomes mediated by CFTR allows studies of channel activity and the effects of small molecules.
10:05
In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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Cited by 7 •
2012
Cystic fibrosis transmembrane conductance regulator (CFTR), an epithelial chloride channel, has been reported to interact with various proteins and regulate important cellular processes; among them the CFTR PDZ motif-mediated interactions have been well documented. This protocol describes methods we developed to assemble a PDZ-dependent CFTR macromolecular signaling complex in vitro.
01:20
Antiepileptic Drugs: Potassium Channel Activators
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2024
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...
09:59
GABA-activated Single-channel and Tonic Currents in Rat Brain Slices
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Cited by 9 •
2011
We use the patch-clamp technique to measure GABA-activated single-channel currents (GABAA channels, GABAA receptors) and the synaptic and tonic currents they generate in neurons. Activation of the channels decreases neuronal excitability in health and disease 1,2,3,4.
08:56
Demonstration of Proteolytic Activation of the Epithelial Sodium Channel (ENaC) by Combining Current Measurements with Detection of Cleavage Fragments
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Cited by 4 •
2014
Proteolytic activation of the epithelial sodium channel (ENaC) heterologously expressed in Xenopus laevis oocytes can be demonstrated by combining current measurements with a biotinylation approach to investigate the appearance of ion channel cleavage products at the cell surface. Functionally important cleavage sites can be identified by using site-directed mutagenesis.
FAQs
CFTR opening depends on two coordinated regulatory inputs. Phosphorylation of the regulatory domain prepares the channel for activation, while ATP binding and hydrolysis at its nucleotide-binding domains regulate transitions between open and closed states. This coordination links cellular signaling with nucleotide availability, allowing epithelial cells to adjust anion transport rather than maintaining constant channel activity.
The nucleotide-binding domains provide the ATP-dependent control system that governs CFTR gating. ATP binding supports channel opening, whereas ATP hydrolysis contributes to the cycle that returns the channel toward closure. Changes in these steps can therefore alter how frequently the channel opens or how long it remains active, affecting overall chloride and bicarbonate movement.
Reduced or altered activity disrupts the coordinated movement of chloride, bicarbonate, and water across epithelial surfaces. The resulting imbalance can impair surface hydration in tissues such as the airways and intestine. In the context of cystic fibrosis, abnormal CFTR function contributes to disease, making the channel’s regulatory behavior an important biological and therapeutic focus.
Electrophysiological assays provide a way to examine CFTR behavior by measuring channel-associated ion transport. They can help investigators assess how regulatory conditions influence opening and closing and compare normal with altered channel function. These measurements support mechanistic studies of epithelial transport, evaluation of CFTR abnormalities, and testing of compounds intended to modify channel behavior.
CFTR modulators are used to test whether channel behavior can be altered in a controlled way. By examining responses in electrophysiological assays, researchers can characterize effects on CFTR activity and investigate strategies for correcting or improving abnormal function. This makes modulators useful both for studying channel mechanisms and for guiding therapeutic development related to cystic fibrosis.
CFTR activity matters in multiple epithelial tissues because chloride and bicarbonate transport help maintain local fluid and electrolyte conditions. In the airways and intestine, impaired regulation can disturb surface hydration and epithelial balance. Studying the same channel in these settings connects molecular gating mechanisms with tissue-level consequences and helps explain the broader biological impact of CFTR dysfunction.