Cftr Function
Cftr Function - 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.
06:59
A Fluorescence-Based Assay of Membrane Potential for High-Throughput Functional Study of Two Endogenous Ion Channels in Two Epithelial Cell Lines
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Cited by 1 •
2022
This protocol describes a method for the study of electrogenic membrane proteins by measuring changes in membrane potential. This assay provides a platform for the functional readout of multiple ion channels endogenously expressed in epithelial cell lines.
02:45
Functional Groups
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2020
Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, the presence of certain functional groups on a molecule will make them hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each...
07:31
A Computerized Functional Skills Assessment and Training Program Targeting Technology Based Everyday Functional Skills
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Cited by 9 •
2020
This training protocol uses computerized training to teach technology-related everyday functional skills. These skills include financial skills, travel and transit, as well as medication management.
FAQs
CFTR opening depends on two regulatory events: phosphorylation and ATP binding. Phosphorylation prepares the channel for activation, while ATP binding supports the transition that permits chloride and bicarbonate passage. This sequence links cellular signaling and energy use to epithelial anion transport, so changes in either step can alter fluid balance across affected tissues.
The channel does not regulate secretions in isolation. CFTR coordinates with other channels and transporters, and that combined activity influences both the hydration and acidity of epithelial secretions. The consequences therefore extend beyond ion movement itself: altered coordination can change the physical and chemical environment of airway, intestinal, pancreatic, and reproductive tract secretions.
CFTR dysfunction can arise from problems with protein production, trafficking, gating, or stability. These categories describe distinct points at which normal channel activity may fail, from generating the protein to maintaining it in a usable form. Identifying the affected step is medically relevant because CFTR modulators are designed to target these specific functional defects.
Measuring CFTR activity provides functional information about whether the channel is operating adequately, rather than relying only on structural or clinical observations. In medicine, this assessment supports diagnosis by linking abnormal channel performance with disrupted epithelial ion transport. The result can help evaluate the functional basis of disease associated with impaired CFTR activity.
The effects vary across tissues because CFTR contributes to secretions in several epithelial organs. In the airways, poorly regulated fluid balance contributes to thick, poorly cleared secretions and pulmonary disease. Similar disruption in the gastrointestinal system can contribute to intestinal and pancreatic disease, while reproductive tract secretions may also be affected.
CFTR modulators address specific defects rather than treating all channel dysfunction as identical. Depending on the problem, therapy may target defective protein production, trafficking, gating, or stability. By improving the amount, location, activity, or persistence of functional CFTR, these treatments aim to improve epithelial secretion and organ function in affected patients.